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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, 2011

Or

For the transition period from                      to                     .

(Exact name of registrant as specified in its charter)

(412) 433-1121

(Registrant’s telephone number,

including area code)

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 Ö No     

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes Ö No     

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definition of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes      No Ö 

Common stock outstanding at April 20, 2011 – 143,768,000 shares

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UNITED STATES STEEL CORPORATION

CONSOLIDATED STATEMENT OF OPERATIONS

(Unaudited)

The accompanying notes are an integral part of these consolidated financial statements.

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UNITED STATES STEEL CORPORATION

CONSOLIDATED BALANCE SHEET

The accompanying notes are an integral part of these consolidated financial statements.

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UNITED STATES STEEL CORPORATION

CONSOLIDATED STATEMENT OF CASH FLOWS

(Unaudited)

The accompanying notes are an integral part of these consolidated financial statements.

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Notes to Consolidated Financial Statements (Unaudited)

United States Steel Corporation (U. S. Steel) produces and sells steel mill products, including flat-rolled and tubular products, in North America and Central Europe. Operations in North America also include transportation services (railroad and barge operations) and real estate operations.

The year-end consolidated balance sheet data was derived from audited statements but does not include all disclosures required for complete financial statements by accounting principles generally accepted in the United States of America. The other 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. Additional information is contained in the United States Steel Corporation Annual Report on Form 10-K for the year ended December 31, 2010 which should be read in conjunction with these financial statements.

There are no new accounting pronouncements for which adoption is expected to have a material effect on U. S. Steel’s financial statements in future accounting periods.

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 other operating segments that do not constitute reportable segments are combined and disclosed in 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 (loss) from operations. Income (loss) from operations for reportable segments and Other Businesses does not include net interest and other financial costs, income taxes, 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 the chief operating decision maker does not review it.

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 steel rounds from Flat-rolled to Tubular is based on cost. All other intersegment sales and transfers are accounted for at market-based prices and are eliminated at the corporate consolidation level. 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 three months ended March 31, 2011 and 2010 are:

The following is a schedule of reconciling items to (loss) income from operations:

Wabush Mines Joint Venture

On February 1, 2010, U. S. Steel Canada Inc. (USSC) completed the previously announced sale of its 44.6 percent interest in the Wabush Mines Joint Venture (Wabush) for approximately $60 million. Wabush owns and operates iron ore mining and pellet facilities in Newfoundland and Labrador and Quebec, Canada. U. S. Steel recognized an immaterial financial impact from the sale.

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The changes in the carrying amount of goodwill by segment for the three months ended March 31, 2011 are as follows:

Goodwill represents the excess of the cost over the fair value of acquired identifiable tangible and intangible assets and liabilities assumed from businesses acquired. We have two reporting units that have a significant amount of goodwill. Our Flat-rolled reporting unit was allocated goodwill from the Stelco Inc. (Stelco) and Lone Star Technologies Inc. (Lone Star) acquisitions in 2007. These amounts reflect the benefits we expect the Flat-rolled reporting unit to realize from expanding our flexibility in meeting our customers’ needs and running our Flat-rolled facilities at higher operating rates to source our semi-finished product needs. Our Texas Operations reporting unit, which is part of our Tubular operating segment, was allocated goodwill from the Lone Star acquisition, reflecting the benefits we expect the reporting unit to realize from the expansion of our tubular operations.

Goodwill is tested for impairment at the reporting unit level annually in the third quarter and whenever events or circumstances indicate that the carrying value may not be recoverable. The evaluation of impairment involves comparing the estimated fair value of the associated reporting unit to its carrying value, including goodwill. U. S. Steel completed its annual goodwill impairment test during the third quarter of 2010 and determined that there was no goodwill impairment for any of the reporting units. Goodwill impairment tests in prior years also indicated that goodwill was not impaired for either reporting unit. Accordingly, there are no accumulated impairment losses for goodwill.

Amortizable intangible assets are being amortized on a straight-line basis over their estimated useful lives and are detailed below:

The carrying amount of acquired water rights with indefinite lives as of March 31, 2011 and December 31, 2010 totaled $75 million. The water rights are tested for impairment annually in the third quarter. The 2010 and prior year tests indicated that the fair value of the water rights exceeded the carrying value. Accordingly, no impairment loss was recognized.

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Amortization expense was $3 million in both the three months ended March 31, 2011 and 2010. The estimated future amortization expense of identifiable intangible assets during the next five years is $8 million for the remaining portion of 2011 and $11 million each year from 2012 to 2015.

The following table reflects the components of net periodic benefit cost for the three months ended March 31, 2011 and 2010:

Employer Contributions

During the first three months of 2011, U. S. Steel made $22 million in required cash contributions to the main USSC pension plans, cash payments of $15 million to the Steelworkers Pension Trust and $2 million in cash payments to other defined benefit pension plans.

During the first three months of 2011, cash payments of $77 million were made for other postretirement benefit payments not funded by trusts.

Company contributions to defined contribution plans totaled $10 million and $2 million for the three months ended March 31, 2011 and 2010, respectively.

Health Care Legislation

The Patient Protection and Affordable Care Act of 2010 (“PPACA”) includes many provisions impacting health care and health insurance coverage in the U.S. Beginning in 2013, PPACA eliminates the tax deductibility of retiree prescription drug expenses allocable to the Medicare Part D subsidies received by an employer. U. S. Steel recorded a tax charge of $27 million in the first quarter of 2010 to adjust deferred tax assets in order to recognize the estimated future tax effects. The Company believes that its retiree health indemnity plans are exempt from the PPACA’s group market reform requirements, but that the HMO plans in which many retirees participate may be required to implement these new requirements, thereby potentially resulting in higher premiums for these retirees. Based on the guidance that has been issued to date with respect to the PPACA provision which imposes an excise tax on high-cost employer-sponsored health plan coverage beginning in 2018, the Company believes it has a de minimis liability exposure for such future excise taxes on retiree medical benefits. Also, the Federal government has approved the Company’s applications under the Early Retiree Reinsurance Program (ERRP), which is a temporary program established under the PPACA to reimburse the sponsor of employment-based health plans for a portion of the cost of health care benefits provided to pre-Medicare participants, and the Company expects to receive ERRP reimbursements beginning later in 2011.

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Other financial (income) costs include financing costs as well as foreign currency gains and losses as a result of transactions denominated in currencies other than the functional currencies of U. S. Steel’s subsidiaries. During the three months ended March 31, 2011 and 2010, net foreign currency gains of $77 million and losses of $63 million, respectively, were recorded in other financial (income) costs. See note 11 for additional information on U. S. Steel’s use of derivatives to mitigate its foreign currency exchange rate exposure.

Tax provision

For the three months ended March 31, 2011 and 2010, we recorded a tax provision of $16 million on our pretax loss of $70 million and a tax benefit of $7 million on our pretax loss of $165 million, respectively. The tax provision does not reflect any tax benefit for pretax losses in Canada and Serbia, which are jurisdictions where we have recorded full valuation allowances on deferred tax assets, and also does not reflect any tax provision or benefit for certain foreign currency gains and losses that are not recognized in any tax jurisdiction. Included in the first quarter of 2010 tax benefit is a net tax benefit of $36 million resulting from the conclusion of certain tax return examinations and the remeasurement of existing tax reserves, offset by a tax charge of $27 million as a result of the U.S. health care legislation enacted in the first quarter of 2010 (see note 6).

The tax provision for the first three months of 2011 is based on an estimated annual effective rate, which requires management to make its best estimate of annual pretax income or loss. During the year, management regularly updates forecasted annual pretax results for the various countries in which we operate based on changes in factors such as prices, shipments, product mix, plant operating performance and cost estimates. To the extent that actual 2011 pretax results for U.S. and foreign income or loss vary from estimates applied at the end of the most recent interim period, the actual tax provision or benefit recognized in 2011 could be materially different from the forecasted amount used to estimate the tax provision for the three months ended March 31, 2011.

Income tax receivable

During 2011, U. S. Steel received a net federal income tax refund of $70 million. The income tax receivable of $66 million at March 31, 2011 primarily reflects the additional federal income tax refund that we expect to receive as a result of the carryback of our 2010 losses to prior years.

Unrecognized tax benefits

Unrecognized tax benefits are the differences between a tax position taken, or expected to be taken, in a tax return and the benefit recognized for accounting purposes pursuant to the guidance found in ASC Topic 740 on income taxes. The total amount of unrecognized tax benefits was $115 million at both March 31, 2011 and December 31, 2010. The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate was $103 million and $100 million as of March 31, 2011 and December 31, 2010, respectively.

U. S. Steel records interest related to uncertain tax positions as a part of net interest and other financial costs in the Statement of Operations. Any penalties are recognized as part of selling, general and administrative expenses. As of March 31, 2011 and December 31, 2010, U. S. Steel had accrued liabilities of $5 million and $4 million, respectively, for interest related to uncertain tax positions. U. S. Steel currently does not have any liabilities recorded for income tax penalties.

It is reasonably expected that during the next 12 months unrecognized tax benefits related to income tax issues will not change by a significant amount.

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Deferred taxes

As of March 31, 2011, the net domestic deferred tax asset was $560 million compared to $563 million at December 31, 2010. A substantial amount of U. S. Steel’s domestic deferred tax assets relates to employee benefits that will become deductible for tax purposes over an extended period of time as cash contributions are made to employee benefit plans and retiree benefits are paid in the future. As a result of our cumulative historical earnings, we continue to believe it is more likely than not that the net domestic deferred tax asset will be realized.

As of March 31, 2011, the net foreign deferred tax asset was $80 million, net of established valuation allowances of $934 million. At December 31, 2010, the net foreign deferred tax asset was $77 million, net of established valuation allowances of $870 million. Net foreign deferred tax assets will fluctuate as the value of the U.S. dollar changes with respect to the Canadian dollar, the euro, and the Serbian dinar. A full valuation allowance is recorded for both the Canadian and Serbian deferred tax assets primarily due to cumulative losses in these jurisdictions in recent years. If evidence changes and it becomes more likely than not that the Company will realize the deferred tax assets, the valuation allowance of $874 million for Canadian deferred tax assets and $50 million for Serbian deferred tax assets as of March 31, 2011, would be partially or fully reversed. Any reversals of these amounts would result in a decrease to income tax expense.

Net Loss Per Share Attributable to United States Steel Corporation Shareholders

Basic net income or loss per common share is based on the weighted average number of common shares outstanding during the period.

Diluted net income per common share assumes the exercise of stock options, the vesting of restricted stock, restricted stock units and performance awards and the conversion of convertible notes (under the “if-converted” method), provided in each case that the effect is dilutive.

The computations for basic and diluted earnings per common share from continuing operations are as follows:

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The following table summarizes the securities that were antidilutive, and therefore, were not included in the computations of diluted loss per common share:

Dividends Paid Per Share

The dividend for the first quarters of 2011 and 2010 was five cents per common share.

Inventories are carried at the lower of cost or market. The first-in, first-out method is the predominant method of inventory costing in Europe and Canada. The last-in, first-out (LIFO) method is the predominant method of inventory costing in the United States. At March 31, 2011 and December 31, 2010, the LIFO method accounted for 50 percent and 48 percent of total inventory values, respectively.

Current acquisition costs were estimated to exceed the above inventory values by $1.1 billion and $885 million at March 31, 2011 and December 31, 2010, respectively. Cost of sales was reduced by $12 million and less than $1 million in the three months ended March 31, 2011 and 2010, respectively, as a result of liquidations of LIFO inventories.

Inventory includes $92 million and $91 million of land held for residential or commercial development as of March 31, 2011 and December 31, 2010, respectively.

From time to time, U. S. Steel enters into coke swap agreements designed to reduce transportation costs. U. S. Steel shipped and received approximately 220,000 tons and 170,000 tons of coke under swap agreements during the first three months of 2011 and 2010, respectively.

U. S. Steel also has entered into iron ore pellet swap agreements. U. S. Steel shipped and received approximately 107,000 tons and 141,000 tons of iron ore pellets during the first three months of 2011 and 2010, respectively.

The coke and iron ore pellet swaps are recorded at cost as nonmonetary transactions. There was no income statement impact related to these swaps in either 2011 or 2010.

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U. S. Steel is exposed to foreign currency exchange rate risks as a result of our European and Canadian operations. USSE’s revenues are primarily in euros and costs are primarily in U.S. dollars and euros. USSC’s revenues and costs are denominated in both Canadian and U.S. dollars. In addition, foreign cash requirements have been and in the future may be funded by intercompany loans, creating intercompany monetary assets and liabilities in currencies other than the functional currency of the entities involved, which can affect income when remeasured at the end of each period. A $1.7 billion U.S. dollar-denominated intercompany loan (the Intercompany Loan) from a U.S. subsidiary to a European subsidiary was the primary exposure at March 31, 2011.

U. S. Steel uses euro forward sales contracts with maturities no longer than 12 months to exchange euros for U.S. dollars to manage our exposure to foreign currency exchange rate fluctuations. Derivative instruments are required to be recognized at fair value in the balance sheet. U. S. Steel has not elected to designate these euro forward sales contracts as hedges. Therefore, changes in their fair value are recognized immediately in the results of operations. The gains and losses recognized on these euro forward sales contracts may also partially offset the accounting remeasurement gains and losses recognized on the Intercompany Loan.

As of March 31, 2011, U. S. Steel held euro forward sales contracts with a total notional value of approximately $445 million. We mitigate the risk of concentration of counterparty credit risk by purchasing our forward sales contracts from several counterparties.

Additionally, we routinely enter into fixed-price forward physical purchase contracts to partially manage our exposure to price risk related to the purchases of natural gas and certain nonferrous metals used in the production process. During 2011 and 2010, all forward physical purchase contracts for natural gas and nonferrous metals have qualified for the normal purchases and normal sales exemption described in ASC Topic 815 and were not subject to mark-to-market accounting.

The following summarizes the location and amounts of the fair values and gains or losses related to derivatives included in U. S. Steel’s financial statements as of March 31, 2011 and December 31, 2010 and for the three months ended March 31, 2011 and 2010:

In accordance with the guidance found in ASC Topic 820 on fair value measurements and disclosures, the fair value of our euro forward sales contracts was determined using Level 2 inputs, which are defined as “significant other observable” inputs. The inputs used are from market sources that aggregate data based upon market transactions. The fair value of our forward physical purchase contracts for natural gas was also determined using Level 2 inputs. The inputs used included forward prices derived from the New York Mercantile Exchange.

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To the extent not otherwise discussed below, information concerning the Senior Notes, the Senior Convertible Notes and other listed obligations can be found in note 16 of the audited financial statements in the 2010 Annual Report on Form 10-K.

Issuance of Senior Notes due 2020

On March 16, 2010, U. S. Steel issued $600 million of 7.375% Senior Notes due April 1, 2020 (2020 Senior Notes). The 2020 Senior Notes were issued at 99.125% of their principal amount. U. S. Steel received net proceeds from the offering of $582 million after fees of $13 million related to the underwriting discount and third party expenses. Interest is payable semi-annually on April 1^st and October 1^st of each year. The 2020 Senior Notes contain covenants restricting our ability to create liens, to enter into sale-leaseback transactions and to consolidate, merge or transfer all, or substantially all of our assets. They also contain provisions requiring the purchase of the 2020 Notes upon a change of control under certain specified circumstances, as well as other customary provisions.

Obligations relating to Environmental Revenue Bonds

U. S. Steel is the ultimate obligor on $458 million of Environmental Revenue Bonds. As of March 31, 2011, U. S. Steel has refunded a portion of these bonds and is the direct underlying obligor on $260 million of these bonds. U. S. Steel is obligated on the remainder ($198 million, which includes $2 million of call premiums) under an agreement that was entered into when it separated from Marathon Oil Corporation (Marathon) on December 31, 2001 (the Separation). The agreement provides that on or before the tenth anniversary of the Separation (December 31, 2011), U. S. Steel will provide for the discharge of Marathon from any remaining liability under any of these bond obligations by retiring or refunding these bonds, or amending them to relieve Marathon’s liability.

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Amended Credit Agreement

As of March 31, 2011, there were no amounts drawn on the $750 million Credit Agreement dated May 11, 2007 (Amended Credit Agreement) and inventory values supported the full $750 million of the facility. The Amended Credit Agreement contains a financial covenant requiring U. S. Steel to maintain a fixed charge coverage ratio (as further defined in the Amended Credit Agreement) of at least 1.10 to 1.00 for the most recent four consecutive quarters when availability under the Amended Credit Agreement is less than the greater of 15% of the total aggregate commitments and $112.5 million. Since availability was greater than $112.5 million, compliance with the fixed charge coverage ratio covenant was not applicable. However, based on the most recent four quarters, as of March 31, 2011, we would not meet this covenant if we were to borrow more than $637.5 million under this agreement. If the value of inventory does not support the full amount of the facility or we are not able to meet this covenant in the future, the full amount of this facility would not be available to the Company.

Receivables Purchase Agreement

As of March 31, 2011, U. S. Steel has a Receivables Purchase Agreement (RPA) under which trade accounts receivable are sold, on a daily basis without recourse, to U. S. Steel Receivables, LLC (USSR), a wholly owned, bankruptcy-remote, special purpose entity used only for the securitization program. If U. S. Steel decides to access this facility, USSR then sells senior undivided interests in up to $525 million of the receivables to certain third-party commercial paper conduits for cash, while maintaining a subordinated undivided interest in a portion of the receivables. U. S. Steel has agreed to continue servicing the sold receivables at market rates. Because U. S. Steel receives adequate compensation for these services, no servicing asset or liability is recorded.

At March 31, 2011 and December 31, 2010, there were no receivables transferred under this facility and eligible accounts receivable supported $525 million of availability under the RPA. The net book value of U. S. Steel’s retained interest in the receivables represents the best estimate of the fair market value due to the short-term nature of the receivables. The retained interest in the receivables is recorded net of the allowance for bad debts, which has historically not been significant. The RPA expires on July 19, 2013.

USSR pays the conduits a discount based on the conduits’ borrowing costs plus incremental fees. We paid $1 million in each of the three month periods ended March 31, 2011 and 2010 relating to fees on the RPA.

Generally, the facility provides that as payments are collected from the sold accounts receivables, USSR may elect to have the conduits reinvest the proceeds in new eligible accounts receivable. As there was no activity under this facility during the three months ended March 31, 2011 and 2010, there were no collections reinvested.

The table below summarizes the trade receivables for USSR:

The facility may be terminated on the occurrence and failure to cure certain events, including, among others, failure of USSR to maintain certain ratios related to the collectability of the

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receivables and failure to make payment under its material debt obligations and may also be terminated upon a change of control.

Change in control event

In the event of a change in control of U. S. Steel, debt obligations totaling $3,062 million at March 31, 2011, which includes the Senior Notes and Senior Convertible Notes, may be declared immediately due and payable. In addition, the Amended Credit Agreement may be terminated and any amount outstanding thereunder may be declared immediately due and payable. In such event, U. S. Steel may also be required to either repurchase the leased Fairfield slab caster for $38 million or provide a letter of credit to secure the remaining obligation.

U. S. Steel Košice (USSK) credit facilities

At March 31, 2011, USSK had no borrowings under its €200 million (approximately $284 million) revolving unsecured credit facility.

At March 31, 2011, USSK had no borrowings against its €80 million credit facilities (which approximated $114 million) and the availability was approximately $106 million due to approximately $8 million of customs and other guarantees outstanding.

U. S. Steel Serbia (USSS) credit facilities

At March 31, 2011, USSS had no borrowings against its facilities which consist of facilities for general corporate purposes of up to €20 million and facilities for overdrafts of up to 1 billion Serbian dinars (which together totaled approximately $42 million), subject in each case to a borrowing base calculation based upon the value of USSS’s inventory of finished and semi-finished inventory. At March 31, 2011, USSS inventory values were sufficient to utilize the entire amount of the facilities.

U. S. Steel’s asset retirement obligations (AROs) primarily relate to mine and landfill closure and post-closure costs. The following table reflects changes in the carrying values of AROs:

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

Effective January 1, 2010, U. S. Steel adopted updates to ASC Topic 810 related to improvements to financial reporting by enterprises involved with variable interest entities. The updates to ASC Topic 810 include a criterion that requires the primary beneficiary to have the power to direct the activities that most significantly impact the economic performance of the variable interest entity. Due to the addition of this criterion, the adoption resulted in the deconsolidation of the following entities from our consolidated financial statements on a prospective basis.

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Gateway Energy & Coke Company, LLC

Gateway Energy & Coke Company, LLC (Gateway) is a wholly owned subsidiary of SunCoke Energy, Inc. in which U. S. Steel has no ownership interest. Gateway has constructed a heat recovery coke plant with an expected annual capacity of 650,000 tons of coke at U. S. Steel’s Granite City Works that began operations in the fourth quarter of 2009. U. S. Steel has a 15-year arrangement to purchase coke from Gateway under which Gateway is obligated to supply 90 percent to 105 percent of the expected annual capacity of the heat recovery coke plant, and U. S. Steel is obligated to purchase the coke from Gateway at the contract price. As of March 31, 2011, a maximum default payment of approximately $277 million would apply if U. S. Steel terminates the agreement.

There are three activities that most significantly impact Gateway’s economic performance: procurement of coking coal used in the production of coke, direction of the operations associated with the production of coke and steam and direction of the sale of coke and steam. U. S. Steel and Gateway jointly direct the sale of coke and steam due to the 15-year arrangement described above; however, U. S. Steel does not have the power to direct the other activities that most significantly impact Gateway’s economic performance. Since the only activity in which U. S. Steel shares power is less significant than the combination of the other significant activities, U. S. Steel is not the primary beneficiary. Accordingly, as of January 1, 2010, U. S. Steel deconsolidated Gateway and all activity with Gateway is now accounted for as third party transactions.

Daniel Ross Bridge, LLC

Daniel Ross Bridge, LLC (DRB) was established for the development of a 1,600 acre master-planned community in Hoover, Alabama. The economic performance of DRB is significantly impacted by the fair value of the underlying property. The activities that most directly impact DRB’s economic performance are the development, marketing, and sale of the underlying property, none of which are directed by U. S. Steel. Since U. S. Steel does not have the power to direct the activities that most significantly impact DRB’s economic performance, U. S. Steel is not the primary beneficiary. Accordingly, U. S. Steel deconsolidated DRB and began accounting for this entity using the equity method of accounting effective January 1, 2010.

The carrying value of cash and cash equivalents, current accounts and notes receivable, accounts payable, bank checks outstanding and accrued interest included in the Consolidated Balance Sheet approximate fair value. See note 11 for disclosure of U. S. Steel’s derivative instruments, which are accounted for at fair value on a recurring basis.

The following table summarizes U. S. Steel’s financial assets and liabilities that were not carried at fair value at March 31, 2011 and December 31, 2010.

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The following methods and assumptions were used to estimate the fair value of financial instruments included in the table above:

Investments and long-term receivables: Fair value is based on discounted cash flows. U. S. Steel is subject to market risk and liquidity risk related to its investments; however, these risks are not readily quantifiable.

Long-term debt instruments: Fair value was determined using Level 2 inputs which were derived from quoted market prices and is based on the yield on public debt where available or current borrowing rates available for financings with similar terms and maturities.

Fair value of the financial assets and liabilities disclosed herein is not necessarily representative of the amount that could be realized or settled, nor does the fair value amount consider the tax consequences of realization or settlement.

Financial guarantees are U. S. Steel’s only unrecognized financial instrument. For details relating to financial guarantees see note 18.

The following table reflects the first three months of 2011 and 2010 reconciliation of the carrying amount of total equity, equity attributable to United States Steel Corporation and equity attributable to the noncontrolling interests: