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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

For the Quarterly Period Ended March 31, 2005

Or

For the transition period from                      to                     .

(Exact name of registrant as specified in its charter)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes X No     

Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Act).  Yes X No     

Common stock outstanding at April 27, 2005 – 114,186,475 shares

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PART I – FINANCIAL INFORMATION

Item I – Financial Statements

UNITED STATES STEEL CORPORATION

STATEMENT OF OPERATIONS

(Unaudited)

The accompanying notes are an integral part of these financial statements

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UNITED STATES STEEL CORPORATION

BALANCE SHEET

(Unaudited)

The accompanying notes are an integral part of these financial statements

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UNITED STATES STEEL CORPORATION

STATEMENT OF CASH FLOWS

(Unaudited)

The accompanying notes are an integral part of these financial statements

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United States Steel Corporation (U. S. Steel) is engaged domestically in the production, sale and transportation of steel mill products, coke and iron ore pellets; the management and development of real estate; engineering and consulting services and, through U. S. Steel Kosice (USSK) and U. S. Steel Balkan (USSB), in the Slovak Republic and Serbia, respectively in the production and sale of steel mill products.

The information in these financial statements is unaudited but, in the opinion of management, reflects all adjustments necessary for a fair presentation of the results for the periods covered. All such adjustments are of a normal recurring nature unless disclosed otherwise. These financial statements, including notes, have been prepared in accordance with the applicable rules of the Securities and Exchange Commission and do not include all of the information and disclosures required by accounting principles generally accepted in the United States of America for complete financial statements. Certain reclassifications of prior year data have been made to conform to 2004 classifications including income from investees, net gains on disposal of assets and other income which are now part of operating expenses rather than part of revenues and other income (now referred to as net sales). This change was made so that U. S. Steel’s statement of operations is more comparable to those of competitors and other manufacturing companies. Additional information is contained in the United States Steel Corporation Annual Report on Form 10-K for the year ended December 31, 2004.

U. S. Steel has various stock-based employee compensation plans. U. S. Steel accounts for those plans under the recognition and measurement principles of APB Opinion No. 25, “Accounting for Stock Issued to Employees,” (APB 25) and related Interpretations. No stock-based employee compensation cost is reflected in net income for stock options or tandem stock appreciation rights (SARs) at the date of grant, as all options and SARs granted have an exercise price equal to the market value of the underlying common stock. When the stock price exceeds the grant price, SARs are adjusted for changes in the market value and compensation expense is recorded. Deferred compensation for restricted stock under the United States Steel Corporation 2002 Stock Plan (2002 Stock Plan) and the USX Corporation 1990 Stock Plan (1990 Stock Plan) is charged to equity when the restricted stock is granted and subsequently adjusted for changes in the market value of the underlying stock. The deferred compensation is then expensed over the vesting period and adjusted if conditions of the restricted stock grant are not met. Deferred compensation for the restricted stock plan for certain salaried employees who are not officers of U. S. Steel is charged to equity when the restricted stock is granted and subsequently expensed over the vesting period.

In December 2004, the Financial Accounting Standard Board (FASB) issued Statement of Financial Accounting Standards (FAS) No. 123 (revised 2004), “Shared-Based Payment,” (FAS 123R) which is an amendment of FAS No. 123, “Accounting for Stock-Based Compensation,” (FAS 123) and supersedes APB 25 and its related implementation guidance. See further discussion in Note 3.

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The following table illustrates the effect on net income and earnings per share if U. S. Steel had applied the fair value recognition provisions of FAS 123:

The above pro forma amounts were based on a Black-Scholes option-pricing model, which included the following information and assumptions:

No SARs were issued in 2004 or 2005. U. S. Steel had 196,350 and 2,496,160 outstanding stock appreciation rights (SARs) at March 31, 2005 and 2004, respectively. Related compensation income of $1 million and expense of $10 million was recorded during the quarter ended March 31, 2005 and 2004, respectively.

In March 2005, the FASB issued FASB Interpretation No. 47, “Accounting for Conditional Asset Retirement Obligations, an interpretation of FASB Statement No. 143.” This Interpretation clarifies that an entity is required to recognize a liability for the fair value of a conditional asset retirement obligation if the fair value of the liability can be reasonably estimated. Uncertainty about the timing and (or) method of settlement of a conditional asset retirement obligation should be factored into the measurement of the liability when sufficient information exists. This Interpretation is effective for U. S. Steel no later than December 31, 2005, with early adoption encouraged. U. S. Steel is in the process of evaluating the effect of this Interpretation.

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In April 2005, the Securities and Exchange Commission (SEC) approved a new rule that delays the effective date of FAS 123R. Except for this deferral of the effective date, the guidance in FAS 123R is unchanged. Under the SEC’s rule, FAS 123R is now effective for U. S. Steel for annual, rather than interim, periods that begin after June 15, 2005. U. S. Steel will apply this Statement to all awards granted on or after January 1, 2006 and to awards modified, repurchased, or cancelled after that date. Compensation cost will be recognized on and after January 1, 2006 for the portion of outstanding awards for which requisite service has not yet been rendered, based on the grant-date fair value of these awards calculated under FAS 123, for proforma disclosures. Currently, U. S. Steel expects that the effect of adopting this Statement on 2006 results will be a reduction to net income of less than $25 million.

U. S. Steel has three reportable segments: Flat-rolled Products (Flat-rolled), U. S. Steel Europe (USSE), and Tubular Products (Tubular). The results of several operating segments that do not constitute reportable segments are combined and disclosed in the Other Businesses category. Real Estate was a reportable segment until the end of 2004. As of January 1, 2005, the results of Real Estate are included in the Other Businesses category and prior period results have been restated to conform to this presentation. Real Estate’s results are managed and reviewed by the chief operating decision maker as part of the Other Businesses category.

The chief operating decision maker evaluates performance and determines resource allocations based on a number of factors, the primary measure being income from operations. Income from operations for reportable segments and Other Businesses does not include net interest and other financial costs, the income tax provision (benefit), benefit expenses for current retirees and certain other items that management believes are not indicative of future results. Information on segment assets is not disclosed as it is not reviewed by the chief operating decision maker.

The accounting principles applied at the operating segment level in determining income from operations are generally the same as those applied at the consolidated financial statement level. The transfer value for rounds from Flat-rolled to Tubular and the transfer value for domestic iron ore pellets from Other Businesses to Flat-rolled were set at the beginning of each year based on expected total production costs. Some intersegment sales and transfers for other operations are accounted for at cost, while others are accounted for at market-based prices. All intersegment sales and transfers are eliminated at the corporate consolidation level. All corporate-level selling, general and administrative expenses and costs related to certain former businesses are allocated to the reportable segments and Other Businesses based on measures of activity that management believes are reasonable.

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The results of segment operations for the first quarter of 2005 and 2004 are:

The following is a schedule of reconciling items for the first quarter of 2005 and 2004:

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The following table reflects components of net periodic benefit cost for the three months ended March 31, 2005 and 2004:

Employer Contributions

U. S. Steel’s Board of Directors authorized additional contributions to U. S. Steel’s trusts for pensions and its Voluntary Employees’ Beneficiary Association (VEBA) trust of up to $260 million by the end of 2006. U. S. Steel previously disclosed in its financial statements for the year ended December 31, 2004, that it expects to make a voluntary contribution of $130 million to its main defined benefit pension plan in 2005, and make cash payments of $12 million to other plans and $26 million to a multiemployer plan. As of March 31, 2005, a voluntary contribution of $130 million was made to the main defined benefit pension plan and cash payments of $2 million and $7 million were made to other plans and a multiemployer plan, respectively.

U. S. Steel also disclosed in its financial statements for the year ended December 31, 2004, that it expects to make a $12 million cash contribution to its other postretirement plans and to make cash payments totaling $231 million for other postretirement benefit payments not funded by trusts in 2005. As of March 31, 2005, $10 million in contributions were made to other postretirement plans and cash payments of $56 million were made for other postretirement benefit payments not funded by trusts.

Company contributions to defined contribution plans totaled $4 million for the three months ended March 31, 2005 and 2004.

U. S. Steel records depreciation on a modified straight-line method for domestic steel-related assets based upon raw steel production levels. Applying modification factors decreased expenses by $4 million and $2 million for the first quarter of 2005 and 2004, respectively.

Accumulated depreciation and depletion totaled $7,322 million and $7,237 million at March 31, 2005 and December 31, 2004, respectively.

In the first quarter of 2004, U. S. Steel sold its remaining mineral interests, including coal seam gas interests, and certain real estate interests for net cash proceeds of $67 million. The sale resulted in a gain on disposal of assets of $36 million and other income, related to the sale of coal seam gas interests, of $7 million.

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See Note 7 for a discussion of other income related to the sale of coal seam gas interests in the first quarter of 2004.

Net interest and other financial costs for the first quarter 2005 included a favorable effect of $25 million related to the Gary Works property tax settlement. See Note 19 for further discussion.

Net interest and other financial costs include amounts related to the remeasurement of USSK’s and USSB’s net monetary assets into the U.S. dollar, which is the functional currency for both. During the first quarter of 2005, net losses of $27 million were recorded, compared with net losses of $2 million in the first quarter of 2004.

The income tax provision in the first three months of 2005 reflects an estimated annual effective tax rate of 23 percent. This provision is based on an estimated annual effective rate, which requires management to make its best estimate of annual forecast pretax income for the year. During the year, management regularly updates forecast estimates based on changes in various factors such as prices, shipments, product mix, plant operating performance and cost estimates, including labor, raw materials, energy and pension and other postretirement benefits. To the extent that actual pretax results for domestic and foreign income in 2005 vary from forecast estimates applied at the end of the most recent interim period, the actual tax provision recognized in 2005 could be materially different from the forecast annual tax provision as of the end of the first quarter. In addition, U. S. Steel recognized $37 million of income tax expense in the first quarter 2005 related to the $95 million pre-tax gain from the Gary property tax settlement discussed in Note 19.

As of March 31, 2005, the amount of net foreign deferred tax assets recorded was $48 million, net of an established valuation allowance of $59 million. As of December 31, 2004, the amount of net foreign deferred tax assets recorded was $36 million, net of an established valuation allowance of $48 million. Net foreign deferred tax assets will fluctuate as the value of the U.S. dollar changes with respect to the Slovak koruna and Serbian dinar. A full valuation allowance is recorded for Serbian deferred tax assets due to the lack of historical information and the losses experienced in the months immediately following the acquisition of USSB. If USSB continues to generate income, the valuation allowance of $33 million for Serbian taxes could be partially or fully reversed at such time that it is more likely than not that the related deferred tax assets will be realized.

As of March 31, 2005, the net domestic deferred tax liability was $490 million compared to $375 million at December 31, 2004.

The Slovak Income Tax Act provides an income tax credit which is available to USSK if certain conditions are met. In order to claim the tax credit in any year, 60 percent of USSK’s sales must be export sales and USSK must reinvest the tax credits claimed in qualifying capital expenditures during the five years following the year in which the tax credit is claimed. See Note 19 for a discussion of the capital improvement program commitments to the Slovak government. The provisions of the Slovak Income Tax Act permit USSK to claim a tax credit of 100 percent of USSK’s tax liability for years 2000 through 2004 and 50 percent of the current statutory rate of 19 percent for the years 2005 through 2009. The Slovak government has concluded audits for the years 2000 and 2001 and issued a favorable protocol indicating that USSK has complied with the

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tax credit agreements. Management believes that USSK has also fulfilled all of the necessary conditions for claiming the tax credit for 2002 through 2004. As a result of claiming tax credits of 100 percent of USSK’s tax liability and management’s intent to reinvest earnings in foreign operations, virtually no current income tax provision, except for the two $16 million tax payments discussed below, was recorded for USSK income for 2000 through 2004. During the first quarter 2005, a current income tax provision was booked for USSK because the tax credit is limited to 50 percent of the statutory rate for the years 2005 through 2009.

In connection with Slovakia joining the European Union (EU), the total tax credit granted to USSK for the period 2000 through 2009 was limited to $430 million, and USSK agreed to make tax payments of $16 million in 2004 and 2005, the first of which was paid in June 2004. U. S. Steel recorded a tax charge of $32 million in the first quarter of 2004 to account for the effects of this agreement. Also, additional conditions for claiming the tax credit were established. These new conditions limit USSK’s annual production of flat-rolled products and its sales of all products into the 15 countries that were members of the EU prior to Slovakia and nine other nations joining the EU in May 2004. Despite a 2003 lowering of the Slovak income tax rate, the future impact of these tax credit limitations could be material due to recent strong earnings at USSK. Management does not believe that the production and sales limits are materially burdensome.

On October 22, 2004, the President signed the American Jobs Creation Act of 2004 (the Act). The Act provides a deduction for income from qualified domestic production activities, which will be phased in from 2005 through 2010. In return, the Act also provides for a two-year phase-out of the existing extra-territorial income exclusion (ETI) for foreign sales that was viewed to be inconsistent with international trade protocols by the European Union. U. S. Steel expects the net effect of the phase-out of the ETI and the phase-in of this new deduction to result in a decrease in the effective tax rate for fiscal years 2005 and 2006 of less than 1 percentage-point, based on current earnings levels. In the long-term, U. S. Steel expects that the new deduction will result in a decrease of the annual effective tax rate of approximately 2 percentage-points based on current earnings levels. Under the guidance in FSP FAS 109-1, the deduction will be treated as a “special deduction” as described in FAS 109. As such, the special deduction has no effect on deferred tax assets and liabilities existing as of the enactment date. Rather, the impact of this deduction will be reported in the period in which the deduction is claimed on U. S. Steel’s tax return.

Basic net income per common share was calculated by adjusting net income for dividend requirements of preferred stock and is based on the weighted average number of common shares outstanding during the quarter.

Diluted net income per common share assumes the exercise of stock options and restricted stock and the conversion of preferred stock, provided in each case the effect is dilutive. For the first quarter ended March 31, 2005 and 2004, 696,590 shares and 660,950 shares of common stock related to employee options and restricted stock, respectively and 15,964,000 shares applicable to the conversion of preferred stock have been included in the computation of diluted net income because their effect was dilutive. Net income has not been adjusted for preferred stock dividend requirements since their conversion is assumed.

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Inventories are carried at the lower of cost or market. At March 31, 2005 and December 31, 2004, the last-in, first-out (LIFO) method accounted for 84 percent of total inventory values.

Current acquisition costs were estimated to exceed the above inventory values by $840 million at March 31, 2005 and by $770 million at December 31, 2004. Costs of sales was reduced by $61 million $25 million in the first three months of 2005 and 2004, respectively, as a result of liquidations of LIFO inventories.

In addition to cost of sales effects, USSK LIFO liquidations also produced foreign currency exchange losses of less than $1 million for the first three months of 2005 and foreign exchange gains of $2 million for the first three months of 2004. These foreign currency gains are included in net interest and other financial costs. See Note 9.

Supplies and sundry items inventory in the table above includes $46 million of land held for residential/commercial development as of March 31, 2005, and December 31, 2004

At March 31, 2005, in the event of a change in control of U. S. Steel, debt obligations totaling $775 million may be declared immediately due and payable. In such event, U. S. Steel may also

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be required to either repurchase the leased Fairfield slab caster for $83 million or provide a letter of credit to secure the remaining obligation.

U. S. Steel was in compliance with all of its debt covenants at March 31, 2005.

U. S. Steel’s asset retirement obligations primarily relate to mine and landfill closure and post-closure costs.

The following table reflects changes in the carrying values of asset retirement obligations:

Certain asset retirement obligations related to disposal costs of fixed assets at our steel facilities have not been recorded because they have an indeterminate settlement date. These asset retirement obligations will be initially recognized in the period in which sufficient information exists to estimate fair value.

1314B Partnership

In accordance with FASB Interpretation No. 46 (revised December 2003), “Consolidation of Variable Interest Entities, an interpretation of ARB No. 51,”(FIN 46R), U. S. Steel was required to consolidate the 1314B Partnership as of January 1, 2004. The 1314B Partnership was previously accounted for under the equity method. U. S. Steel is the sole general partner and there are two unaffiliated limited partners. U. S. Steel is responsible for purchasing, operations and sales of coke and coke by-products. U. S. Steel has a commitment to fund operating cash shortfalls of the 1314B Partnership of up to $150 million. Additionally, U. S. Steel, under certain circumstances, is required to indemnify the limited partners if the partnership product sales fail to qualify for credits under Section 29 of the Internal Revenue Code. Furthermore, U. S. Steel, under certain circumstances, has indemnified the 1314B Partnership for environmental obligations. See Note 19 for further discussion of commitments related to the 1314B Partnership.

Upon the initial consolidation of the 1314B Partnership, $28 million of current assets, $8 million of net property, plant and equipment, no liabilities and a minority interest of $22 million were included on the balance sheet. A $14 million cumulative effect of change in accounting principle benefit, net of tax, was recorded in the first quarter of 2004.

Blackbird Acquisition Inc.

In accordance with FIN 46R, U. S. Steel consolidated Blackbird Acquisition Inc., an entity established during the third quarter of 2004 to facilitate the purchase and sale of certain fixed assets. U. S. Steel has no ownership interest in Blackbird Acquisition Inc. During 2004, $29 million of property, plant and equipment was purchased through this entity and reflected on U. S. Steel’s balance sheet, $16 million of which was consolidated through Blackbird at March 31, 2005 and December 31, 2004. All other financial impacts were insignificant.

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Sale of accounts receivable

During the three months ended March 31, 2005 and 2004, no revolving interest in accounts receivable were sold to or repurchased from conduits. As of March 31, 2005, $500 million was available under this facility.

U. S. Steel’s net interest and other financial costs for the three months ended March 31, 2005 and 2004, included costs on the sale of receivables of less than $1 million.

On March 9, 2004, U. S. Steel sold 8 million shares of its common stock in a public offering for net proceeds of $294 million. Proceeds from this offering were used to redeem $72 million principal amount of the 9 ³/4% Senior Notes at 109.75 percent of the principal amount plus accrued interest and $187 million of the 10 ³/4% Senior Notes at 110.75 percent of the principal amount plus accrued interest on April 19, 2004.

Preferred share dividends of $4 million accrued during the first quarter of 2004 reduced the paid-in capital of the Series B Preferred on the balance sheet because of U. S. Steel’s retained deficit during that period.

The following table reflects comprehensive income for the three months ended March 31, 2005 and 2004:

Revenues from related parties and receivables from related parties primarily reflect sales of steel products, raw materials, transportation services and fees for providing various management and other support services to equity and certain other investees. Generally, transactions are conducted under long-term market-based contractual arrangements. Total revenues generated by sales and service transactions with equity investees were $256 million and $210 million for the quarter ended March 31, 2005 and 2004, respectively. Revenues from related parties and receivables from related parties also include amounts related to the sale of materials, primarily coke by-products, to Marathon Oil Corporation (Marathon) and amounted to $9 million and $5 million for the quarter ended March 31, 2005 and 2004, respectively. Sales to related parties were conducted under terms comparable to those with unrelated parties.

Long-term receivables from related parties at March 31, 2005 and December 31, 2004, reflect amounts due from Marathon related to contractual reimbursements for the retirement of participants in the non-qualified employee benefit plans and related to tax settlements in accordance with the tax sharing agreement entered into when U. S. Steel separated from Marathon on December 31, 2001. The amounts related to employee benefits will be paid by Marathon as participants retire and the amounts related to taxes will be settled after conclusion of the audit of Marathon’s consolidated federal tax returns for the years 1998 through 2001.

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Accounts payable to related parties include balances due to PRO-TEC Coating Company (PRO-TEC) under an agreement whereby U. S. Steel provides marketing, selling and customer service functions, including invoicing and receivables collection, for PRO-TEC. U. S. Steel, as PRO-TEC’s exclusive sales agent, is responsible for credit risk associated with the receivables. Payables to PRO-TEC under the agreement were $71 million and $56 million at March 31, 2005 and December 31, 2004, respectively.

Accounts payable to related parties at March 31, 2005 and December 31, 2004, also reflect the purchase of outside processing services from equity and certain other investees and the purchase of energy related products from Marathon. Purchases from these related parties totaled $17 million and $18 million as of March 31, 2005 and 2004, respectively.

U. S. Steel is the subject of, or party to, a number of pending or threatened legal actions, contingencies and commitments involving a variety of matters, including laws and regulations relating to the environment. Certain of these matters are discussed below. The ultimate resolution of these contingencies could, individually or in the aggregate, be material to the consolidated financial statements. However, management believes that U. S. Steel will remain a viable and competitive enterprise even though it is possible that these contingencies could be resolved unfavorably.

U. S. Steel accrues for estimated costs related to existing lawsuits, claims and proceedings when it is probable that it will incur these costs in the future.

Asbestos matters – U. S. Steel is a defendant in approximately 450 active cases involving approximately 10,000 plaintiffs. At December 31, 2004, U. S. Steel was a defendant in approximately 500 active cases involving approximately 11,000 plaintiffs. Many of these cases involve multiple defendants (typically from fifty to more than one hundred defendants). More than 9,500, or 95 percent, of these claims are pending in jurisdictions which permit filings with massive numbers of plaintiffs. Based upon U. S. Steel’s experience in such cases, it believes that the actual number of plaintiffs who ultimately assert claims against U. S. Steel will likely be a small fraction of the total number of plaintiffs.

These claims against U. S. Steel fall into three major groups: (1) claims made under certain federal and general maritime laws by employees of the Great Lakes Fleet or Intercoastal Fleet, former operations of U. S. Steel; (2) claims made by persons who allegedly were exposed to asbestos at U. S. Steel facilities (referred to as “premises claims”); and (3) claims made by industrial workers allegedly exposed to products formerly manufactured by U. S. Steel. While U. S. Steel has excess casualty insurance, these policies have multi-million dollar self-insured retentions. To date, U. S. Steel has not received any payments under these policies relating to asbestos claims. In most cases, this excess casualty insurance is the only insurance applicable to asbestos claims.

These asbestos cases allege a variety of respiratory and other diseases based on alleged exposure to asbestos. U. S. Steel is currently a defendant in cases in which a total of approximately 160 plaintiffs allege that they are suffering from mesothelioma. The potential for damages against defendants may be greater in cases in which the plaintiffs can prove mesothelioma. In many such cases in which claims have been asserted against U. S. Steel, the plaintiffs have been unable to establish any causal relationship to U. S. Steel or its products or premises. In addition, in many asbestos cases, the plaintiffs have been unable to demonstrate that they have suffered any identifiable injury or compensable loss at all; that any injuries that they have incurred did in fact result from alleged exposure to asbestos; or that such alleged exposure was in any way related to U. S. Steel or its products or premises.

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On March 28, 2003, a jury in Madison County, Illinois returned a verdict against U. S. Steel for $50 million in compensatory damages and $200 million in punitive damages. U. S. Steel believes that the court erred as a matter of law by failing to find that the plaintiff’s exclusive remedy was provided by the Indiana workers’ compensation law. U. S. Steel believes that this issue and other errors at trial would have enabled U. S. Steel to succeed on appeal. However, in order to avoid the delay and uncertainties of further litigation and the posting of a large appeal bond in excess of the amount of the verdict, U. S. Steel settled this case for an amount which was substantially less than the compensatory damages award and which represented a small fraction of the total award. This settlement was reflected in the 2003 results. Management views the verdict and resulting settlement in the Madison County case as aberrational, and believes that the likelihood of similar results in other cases is remote, although not impossible. U. S. Steel has not experienced any material adverse change in its ability to resolve pending claims as a result of the Madison County settlement.

The amount U. S. Steel has accrued for pending asbestos claims is not material to U. S. Steel’s financial position. U. S. Steel does not accrue for unasserted asbestos claims because it believes it is not possible to determine whether any loss is probable with respect to such claims or even to estimate the amount or range of any possible losses. Among the reasons that U. S. Steel cannot reasonably estimate the number and nature of claims against it is that the vast majority of pending claims against it allege so-called “premises” liability based exposure on U. S. Steel’s current or former premises. These claims are made by an indeterminable number of people such as truck drivers, railroad workers, salespersons, contractors and their employees, government inspectors, customers, visitors and even trespassers.

It is not possible to predict the ultimate outcome of asbestos-related lawsuits, claims and proceedings due to the unpredictable nature of personal injury litigation. Despite this uncertainty, and although our results of operations and cash flows for a given period could be adversely affected by asbestos-related lawsuits, claims and proceedings, management believes that the ultimate resolution of these matters will not have a material adverse effect on the Company’s financial condition. Among the factors considered in reaching this conclusion are: (1) that U. S. Steel has been subject to a total of approximately 34,000 asbestos claims over the past 13 years that have been administratively dismissed or are inactive due to the failure of the plaintiffs to present any medical evidence supporting their claims; (2) that over the last several years, the total number of pending claims has generally declined; (3) that it has been many years since U. S. Steel employed maritime workers or manufactured or sold asbestos containing products; and (4) U. S. Steel’s history of trial outcomes, settlements and dismissals, including such matters since the Madison County jury verdict and settlement in March 2003.

Property taxes – The very high property taxes at U. S. Steel’s Gary Works facility in Indiana continue to be detrimental to Gary Works’ competitive position, both when compared to competitors in Indiana and with other steel facilities in the United States and abroad. U. S. Steel has aggressively addressed these issues through a variety of means including negotiation with local officials as well as judicial and administrative proceedings.

The previously announced personal property settlement agreement with the city of Gary, Lake County, and the state of Indiana was approved by the Lake County Property Tax Assessment Board of Appeals and the appeal period following this decision has expired. Under the settlement agreement, U. S. Steel will make a $44 million payment during the second quarter 2005. U. S. Steel also agreed to $150 million of capital spending at its Lake County operations over a four-year period or payment of 7.5 percent of any shortfall from the $150 million commitment, and agreed to negotiate the transfer of approximately 200 acres of property to the city of Gary. U. S. Steel reversed previous accruals of disputed amounts resulting in a reduction to cost of sales of $70 million and a reduction of interest and other financial costs of $25 million in the first quarter of 2005.

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Environmental matters – U. S. Steel is subject to federal, state, local and foreign laws and regulations relating to the environment. These laws generally provide for control of pollutants released into the environment and require responsible parties to undertake remediation of hazardous waste disposal sites. Penalties may be imposed for noncompliance. Accrued liabilities for remediation activities totaled $122 million at March 31, 2005, of which $20 million was classified as current and $123 million at December 31, 2004, of which $21 million was classified as current. It is not presently possible to estimate the ultimate amount of all remediation costs that might be incurred or the penalties that may be imposed. Due to uncertainties inherent in remediation projects and the associated liabilities, it is possible that total remediation costs for active matters may exceed the sum of expenditures to date and accrued liabilities by amounts that could range from insignificant to substantial.

As of March 31, 2005, a total of $58 million is accrued for legal and administrative costs and for post-closure costs for various landfills closed under the Resource Conservation and Recovery Act (RCRA); for two National Resource Damages (NRD) claims at Gary Works; and for the completion of projects for the Grand Calumet River dredging and the related Corrective Action Management Unit (CAMU.) The legal and administrative cost accruals are based on annual legal and administrative cost projections and do not change significantly from year to year. The post closure care costs are fixed based on permitted amounts. The NRD claims are settled and payment schedules are determined. The Grand Calumet River dredging and the related CAMU project are essentially complete, except for currently accrued liabilities for costs associated with re-dredging certain portions of the river. U. S. Steel expects no additional significant accruals for the dredging project. Of the remaining accrued liabilities, there are only five sites for which the accrual exceeds $1.0 million. The largest of these amounts is $13.6 million for closure costs for three hazardous waste sites at Gary Works. A Closure Permit application has been submitted for these three hazardous waste sites, and there has been no meaningful agency action on the application since it was submitted. The remaining four sites in this category total $10 million and have progressed through a significant portion of the design phase. Significant additional costs in excess of the accrued amounts are not expected.

There are four environmental remediation sites where it is reasonably possible that additional costs could have a material effect. These sites are RCRA Corrective Action Programs which require the investigation and possible remediation of soils and ground water for Gary Works, Fairfield Works, and the former Geneva Works; and the Municipal Industrial & Disposal Co. Superfund site in Elizabeth, PA. At March 31, 2005, accrued liabilities for these sites total $21 million associated with the costs of studies, investigations, interim measures, remediation and/or design. Additional liabilities associated with future agency demands regarding existing work at these sites may prove insignificant or could range in the aggregate up to 100 percent of the accrued liabilities. Reasonably possible additional costs for completion of remediation at these sites cannot be estimated but could be material. The remaining sixty-one sites each have accrued liabilities of less than $1.0 million, with fifty-three sites having liabilities of less than $0.5 million. There are no significant additional possible liabilities foreseen for any of these sites.

For a number of years, U. S. Steel has made substantial capital expenditures to bring existing facilities into compliance with various laws relating to the environment. In the first three months of 2005 and 2004 such capital expenditures totaled $28 million and $21 million, respectively. U. S. Steel anticipates making additional such expenditures in the future; however, the exact amounts and timing of such expenditures are uncertain because of the continuing evolution of specific regulatory requirements.

The European Commission (EC) is establishing carbon dioxide emission (CO₂) limits for European Union member countries. On October 20, 2004, the EC approved a national allocation plan for

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Slovakia (NAP) that reduced Slovakia’s original proposed CO₂ allocation by approximately 14 percent and, on December 20, 2004, USSK filed an application for annulment of that decision in the Court of First Instance of the European Communities. In March 2005, the Slovak Ministry of the Environment (Ministry) took action based on the NAP that would require an 8 percent reduction in CO₂ allowances for USSK. USSK subsequently instituted legal proceedings in the Supreme Court of the Slovak Republic requesting annulment of the Ministry’s decision. The legal actions by USSK against the EC and Slovakia will not stay the effects of either the EC’s October 20, 2004 decision or the Ministry’s decision concerning USSK’s CO₂ allowances. USSK is evaluating a number of alternatives ranging from purchasing CO₂ allowances to reducing steel production, and it is not currently possible to predict the impact of these decisions on USSK. Based on the fair value of the anticipated shortfall of allowances related to the first quarter 2005 production, a long-term other liability of $3 million has been recorded on the balance sheet. However, the actual shortfall of allowances for the entire initial allocation period (2005 through 2007) will depend upon a number of internal and external variables and the effect of that shortfall on USSK cannot be predicted with certainty at this time.

Environmental and other indemnifications – Throughout its history, U. S. Steel has sold numerous properties and businesses and many of these sales included indemnifications and cost sharing agreements related to the assets that were sold. These indemnifications and cost sharing agreements have related to the condition of the property, the approved use, certain representations and warranties, matters of title and environmental matters. While most of these provisions have not dealt with environmental issues, there have been transactions in which U. S. Steel indemnified the buyer for non-compliance with past, current and future environmental laws related to existing conditions. Most recent indemnifications and cost sharing agreements are of a limited nature only applying to non-compliance with past and/or current laws. Some indemnifications and cost sharing agreements only run for a specified period of time after the transactions close and others run indefinitely. In addition, current owners of property formerly owned by U. S. Steel may have common law claims and contribution rights against U. S. Steel for environmental matters. The amount of potential environmental liability associated with these transactions is not estimable due to the nature and extent of the unknown conditions related to the properties sold. Aside from the environmental liabilities already recorded as a result of these transactions due to specific environmental remediation activities cases (included in the $122 million of accrued liabilities for remediation discussed above), there are no other known environmental liabilities related to these transactions.

Guarantees – Guarantees of the liabilities of unconsolidated entities of U. S. Steel totaled $24 million at March 31, 2005. In the event that any defaults of guaranteed liabilities occur, U. S. Steel has access to its interest in the assets of the investees to reduce potential losses resulting from these guarantees. As of March 31, 2005, the largest guarantee for a single such entity was $14 million, which represents the maximum exposure to loss under a guarantee of debt service payments of an equity investee. No liability has been recorded for these guarantees.

Contingencies related to Separation from Marathon – U. S. Steel was contingently liable for debt and other obligations of Marathon in the amount of $41 million as of March 31, 2005. In the event of the bankruptcy of Marathon, these obligations for which U. S. Steel is contingently liable may be declared immediately due and payable. Furthermore, certain leases assumed by U. S. Steel can be declared immediately due and payable. The amount of such obligations as of March 31, 2005 was approximately $181 million. No liability has been recorded for these contingencies as management believes the likelihood of occurrence is remote.

If the Separation is determined to be a taxable distribution of the stock of U. S. Steel, but there is no breach of a representation or covenant by either U. S. Steel or Marathon, U. S. Steel would be

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liable for any resulting taxes (Separation No-Fault Taxes) incurred by Marathon. U. S. Steel’s indemnity obligation for Separation No-Fault Taxes survives until the expiration of the applicable statute of limitations. The maximum potential amount of U. S. Steel’s indemnity obligation for Separation No-Fault Taxes at March 31, 2005, is estimated to be $150 million. No liability has been recorded for this indemnity obligation as management believes that the likelihood of the separation being determined to be a taxable distribution of the stock of U. S. Steel is remote.

Other contingencies – Under certain operating lease agreements covering various equipment, U. S. Steel has the option to renew the lease or to purchase the equipment at the end of the lease term. If U. S. Steel does not exercise the purchase option by the end of the lease term, U. S. Steel guarantees a residual value of the equipment as determined at the lease inception date (totaling approximately $32 million at March 31, 2005). No liability has been recorded for these guarantees as either management believes that the potential recovery of value from the equipment when sold is greater than the residual value guarantee, or the potential loss is not probable and/or estimable.

Mining sale – U. S. Steel remains secondarily liable in the event that the purchaser triggers a withdrawal before June 30, 2008 from the multiemployer pension plan that covers employees of its former coal mining business. A withdrawal is triggered when annual contributions to the plan are substantially less than contributions made in prior years. The maximum exposure for the fee that could be assessed upon a withdrawal is $79 million. U. S. Steel has recorded a liability equal to the estimated fair value of this potential exposure. U. S. Steel has agreed to indemnify the purchaser for certain environmental matters, which are included in the environmental matters discussion.

Transtar reorganization – The 2001 reorganization of Transtar, Inc. was intended to be tax-free for federal income tax purposes, with U. S. Steel and Transtar Holdings, L.P. (Holdings), an affiliate of Blackstone Capital Partners, L.P. agreeing through various representations and covenants to protect the reorganization’s tax-free status. If the reorganization is determined to be taxable, but there is no breach of a representation or covenant by either U. S. Steel or Holdings, U. S. Steel is liable for 44 percent of any resulting Holdings taxes (Transtar No-Fault Taxes), and Holdings is responsible for 56 percent of any resulting U. S. Steel taxes. U. S. Steel’s indemnity obligation for Transtar No-Fault Taxes survives until 30 days after the expiration of the applicable statute of limitations on April 15, 2005. The maximum potential amount of U. S. Steel’s indemnity obligation for Transtar No-Fault Taxes at March 31, 2005, was estimated to be approximately $70 million. No liability has been recorded for this indemnity obligation as management believes that the likelihood of the reorganization being determined to be taxable is remote. U. S. Steel can recover all or a portion of any indemnified Transtar No-Fault Taxes if Holdings receives a future tax benefit as a result of the Transtar reorganization being taxable.

Clairton 1314B partnership – See description of the partnership in Note 15. U. S. Steel has a commitment to fund operating cash shortfalls of the partnership of up to $150 million. Additionally, U. S. Steel, under certain circumstances, is required to indemnify the limited partners if the partnership product sales fail to qualify for the credit under Section 29 of the Internal Revenue Code. This indemnity will effectively survive until the expiration of the applicable statute of limitations. The maximum potential amount of this indemnity obligation at March 31, 2005, including interest and tax gross-up, is approximately $630 million. Furthermore, U. S. Steel under certain circumstances has indemnified the partnership for environmental obligations. See discussion of environmental and other indemnifications above. The maximum potential amount of this indemnity obligation is not estimable. Management believes that the $150 million deferred gain related to the partnership, which is recorded in deferred credits and other liabilities, is more than sufficient to cover any probable exposure under these commitments and indemnifications.

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Self-insurance – U. S. Steel is self-insured for certain exposures including workers’ compensation, auto liability and general liability, as well as property damage and business interruption, within specified deductible and retainage levels. Certain equipment that is leased by U. S. Steel is also self-insured within specified deductible and retainage levels. Liabilities are recorded for workers’ compensation and personal injury obligations. Other costs resulting from self-insured losses are charged against income upon occurrence.

U. S. Steel uses surety bonds, trusts and letters of credit to provide whole or partial financial assurance for certain obligations such as workers’ compensation. The total amount of active surety bonds, trusts and letters of credit being used for financial assurance purposes was approximately $139 million and $142 million as of March 31, 2005, and December 31, 2004, respectively, which reflects U. S. Steel’s maximum exposure under these financial guarantees, but not its total exposure for the underlying obligations. Most of the trust arrangements and letters of credit are collateralized by restricted cash that is recorded in other noncurrent assets.

Commitments – At March 31, 2005, U. S. Steel’s domestic contract commitments to acquire property, plant and equipment totaled $226 million. Additionally, U.S. Steel has various purchase contracts for energy and raw materials with terms that are typically for a longer duration than sales contracts for steel products, therefore, U.S. Steel may find its margins reduced in periods of falling steel prices.

USSK has a commitment to the Slovak government for a capital improvements program of $700 million, subject to certain conditions, over a period commencing with the acquisition date of November 24, 2000, and ending on December 31, 2010. The remaining commitment under this capital improvements program as of March 31, 2005 was $223 million.

USSB, acquired on September 12, 2003, has the following commitments with the Serbian government: (i) spending during the first five years for working capital, the repair, rehabilitation, improvement, modification and upgrade of facilities and community support and economic development of up to $157 million, subject to certain conditions; (ii) a stable employment policy for three years assuring employment of the approximately 9,000 employees, excluding natural attrition and terminations for cause; and (iii) an agreement not to sell, transfer or assign a controlling interest in USSB to any third party without government consent for a period of five years. USSB spent approximately $134 million (including working capital) through March 31, 2005. As of March 31, 2005, the remaining commitment with the Serbian government was $23 million.

As of March 31, 2005, under agreements with an unaffiliated third party, U. S. Steel has a remaining commitment to provide work that will generate $55 million of gross profit to the third party through March 31, 2015.

U. S. Steel entered into a 15-year take-or-pay arrangement in 1993, which requires U. S. Steel to accept pulverized coal each month or pay a minimum monthly charge of approximately $1 million. If U. S. Steel elects to terminate the contract early, a maximum termination payment of $68 million as of March 31, 2005, which declines over the duration of the agreement, may be required.

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Certain sections of Management’s Discussion and Analysis include forward-looking statements concerning trends or events potentially affecting the businesses of United States Steel Corporation (U. S. Steel, the Company or the Corporation). These statements typically contain words such as “anticipates,” “believes,” “estimates,” “expects,” “intends” or similar words indicating that future outcomes are not known with certainty and are subject to risk factors that could cause these outcomes to differ significantly from those projected. In accordance with “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995, these statements are accompanied by cautionary language identifying important factors, though not necessarily all such factors that could cause future outcomes to differ materially from those set forth in forward-looking statements. For discussion of risk factors affecting the businesses of U. S. Steel, see “Supplementary Data – Disclosures About Forward-Looking Statements” in U. S. Steel’s Annual Report on Form 10-K for the year ended December 31, 2004.

SEGMENTS

Effective with the first quarter of 2005, U. S. Steel has three reportable segments: Flat-rolled Products (Flat-rolled), U. S. Steel Europe (USSE) and Tubular Products (Tubular). The results of several operating segments that do not constitute reportable segments are combined and disclosed in the Other Businesses category. Real Estate was a reportable segment until the end of 2004. As of January 1, 2005, the results of Real Estate are included in Other Businesses, and prior period results have been restated to conform to this presentation. For further information, see Note 4 to Financial Statements.

RESULTS OF OPERATIONS

Net sales were $3,761 million in the first quarter of 2005, compared with $2,924 million in the same quarter last year. The $837 million increase primarily reflected increased prices for steel products and higher European shipment levels, partially offset by reduced shipments of domestic sheet products and lower trade shipments of coke and iron ore.

Income (Loss) from operations for U. S. Steel for the first quarter of 2005 and the first quarter of 2004 is set forth in the following table: