Strategic Acquisition of
Lone Star Technologies, Inc.
March 29, 2007
©
United States Steel Corporation 2007
Exhibit 99.1

2
Forward —
Looking Statements
Risks and Uncertainties Regarding United States Steel Corporation and Lone Star Technologies, Inc.
Some
factors,
among
others,
that
could
affect
market
conditions,
costs,
shipments
and
prices
for
the
domestic
and
foreign
operations
of
U.
S.
Steel
and
Lone
Star
include
global
product
demand,
prices
and
mix;
global
and
company
steel
production
levels;
global
and
domestic
demand
for
tubular
products;
global
and
domestic
energy
markets;
plant
operating
performance,
including,
the
start
up
of
several
blast
furnaces;
the
timing
and
completion
of
facility
projects;
natural
gas
prices,
usage
and
supply
disruptions;
raw
materials
availability
and
prices;
changes
in
environmental,
tax
and
other
laws;
employee
strikes;
power
outages;
and
U.S.
and
global
economic
performance
and
political
developments.
Domestic
steel
shipments
and
prices
could
be
affected
by
import
levels
and
actions
taken
by
the
U.S.
Government.
Economic
conditions
and
political
facts
in
Europe
that
may
affect
U.
S.
Steel’s
foreign
operations
results
include,
but
are
not
limited
to,
taxation,
environmental
permitting,
nationalization,
inflation,
currency
fluctuations,
increased
regulation,
export
quotas,
tariffs,
and
other
protectionist
measures.
Factors
that
may
affect
the
amount
of
net
periodic
benefit
costs
include,
among
others,
changes
to
laws
affecting
benefits,
pension
fund
investment
performance,
liability
changes
and
interest
rates.
Please
refer
to
the
Form
10-K
of
U.S.
Steel
for
the
year
ended
December
31,
2006
and
the
Form
10-K
of
Lone
Star
Technologies,
Inc.
for
the
year
ended
December
31,
2006
for
additional
factors
that
could
cause
actual
results
to
differ
materially
from
any
forward-looking
statements.
Risks and Uncertainties Regarding the Transaction
Forward-looking
statements
regarding
United
States
Steel
Corporation’s
acquisition
and
integration
of
Lone
Star
Technologies,
Inc.
include
statements
relating
to
or
concerning
expected
synergies,
cost
savings,
accretive
effect,
industry
size,
and
market
sector.
Risks
and
uncertainties
regarding
the
transaction
include
the
possibility
that
the
expected
synergies
may
not
be
realized
in
the
time
period
anticipated
or
at
all,
that
the
market
fails
to
perform
as
anticipated,
and
that
the
closing
does
not
occur,
either
due
to
the
failure
of
closing
conditions,
including
the
approval
of
the
shareholders
of
Lone
Star,
or
the
failure
to
obtain
required
regulatory
approvals,
or
other
reasons.
Even
if
the
transaction
closes
as
anticipated,
integration
may
not
proceed
as
expected,
and
the
impact
of
changes
in
the
industry,
markets
or
the
economy
in
general
may
result
in
unexpected
costs
or
the
failure
to
realize
anticipated
benefits
of
the
transaction.
Forward-looking
statements
included
in
this
news
release
are
made
only
as
of
the
date
hereof,
and
the
companies
undertake
no
obligation
to
update
these
forward-looking
statements
to
reflect
future
events
or
circumstances
except
as
may
be
required
by
law.

3
U. S. Steel acquires Lone Star for $2.1 billion or $67.50 per share
All cash transaction
•Financed with cash on hand and committed credit facilities
Potential annual synergies in excess of $100 million by end of
2008
Acquisition expected to be accretive in 2007 before synergies
•Excluding accounting effects of the sale of acquired inventory and other
customary purchase accounting adjustments
Closing expected in second or third quarter 2007
U. S. Steel to Acquire Lone Star Technologies
Transaction Overview
Lone Star
a leading
North American
producer of
welded tubular
products

4
Leading North American producer of welded OCTG
Major producer and marketer of line pipe
Major supplier to oil patch of threading,heat treating and finishing
Annual production capacity of 1mm tons*. 
2006 revenues of $1.4 billion and EBITDA $203* million
Lone Star Steel Technologies, Inc. (LSS)
Business Overview
Product Mix by Revenue
Oilfield
Products
80%
Specialty
13%
Other
7%
2006 Revenue = $1,378mm
Shipment History (000 tons)
734
882
926
996
0
200
400
600
800
1,000
2003
2004
2005
2006
Other Businesses:
Producer of 
specialty tubing
Marketer of OCTG
and Line Pipe for
others
Producer/supplier
of hot rolled steel
* EBITDA is not a GAAP measure. Please refer to the forms 10-K for the year ended December 31, 2006 filed
by U. S. Steel and Lone Star, respectively, for GAAP financial information.

5
Complementary Assets & Attributes
Expanded and Complementary Product Portfolio
Strong Tubular Product Mix
Creates largest North American fully integrated seamless and
welded tubular producer
Annual synergies estimated to be in excess of $100 million:
Sourcing semi-finished product
SG&A, Procurement and Best Practices
Lone Star Steel Technologies, Inc.
Business Case for Acquisition
The premier North American supplier to the attractive
and growing OCTG market sector

6
U.S. Steel and Lone Star -
Complementary Assets & Attributes
Significant North American
seamless supplier
Full seamless size range
1.9”
through 26”
Limited welded pipe
supplier
World class manufacturing
facilities with heat treating
capacity
Strong distributor
relationships
Leading North American
welded pipe supplier
Full size welded range
utilizing the Alliance mills
1”
through 60”
Additional heat treating
Coupling supply
Tubing finishing & threading
Primarily direct to end
customer
U. S. Steel
Lone Star
Technologies

7
1
5
10
15
20
25
30
60
Inches
Lone Star Steel
Welspun *
Northwest Pipe *
Bellville
Texas Tubular *
Tex-Tube *
Lorain #4
Lorain #3
Fairfield
Camp Hill
Hunan Valin –
Potential JV
Expanded and Complementary
Product Portfolio
USSK
50
Welspun JV
ERW
Seamless
DSAW
Spiral
Welded
* Identifies LSS 
alliances
Apolo JV
LSS
USS

8
U. S. Steel and Lone Star -
Strong Tubular Product Mix
OCTG
59%
2006
Pro forma
Shipments
(2.2 mm tons)
U. S. Steel (1.2 mm tons)
S&L**
29%
Lone Star (1.0 mm tons)
OCTG
59%
S&L**
41%
OCTG
59%
S&L**
15%
Specialty *
9%
LSS Flat Roll
17%
Specialty
4%
LSS Flat Roll
8%
*Customer specified (custom) dimensions and grades
**S&L = Standard and line pipe

9
0
1
2
3
USS / LSS
IPSCO / NS
Group
Tenaris /
Maverick
V&M Star
Creates the Largest N.A. Seamless and
Welded Tubular Producer
Million Tons
2.8 *
2.4
1.7
0.5
Tubular Capacity
Source: Company filings and equity research
**
**
*    1.8 mm USS & 1.0 mm  LSS
* *  2006  Acquisitions

10
Strong Market Outlook Drives Demand
Spot Price
WTI Spot
Price
Source: Spears
500
1,000
1,500
2,000
2,500
'00
'01
'02
'03
'04
'05
'06
'07
'08
'09
'10
'11
Total N.A. Rig Count
$ Barrel
$ mmbtu
Natural Gas
Price
0
20
40
60
80
'00
'01
'02
'03
'04
'05
'06
'07
'08
'09
'10
'11
2
4
6
8
10

11
Financial Overview of Tubular Business
Tons Shipped
U.S. Steel Tubular
Lone Star
Revenue
EBITDA**
% margin
Operating Income
% margin
1.2 million
1.0 million*
$1,798
$1,378
$631
$173
$644
$203
35.1%
12.5%
35.8%
14.7%
Source: Company filings
* Excludes alliance mills & Apolo joint venture
** EBITDA is not a GAAP measure. Please refer to the forms 10-K for the year ended December
31, 2006 filed by U. S. Steel and Lone Star, respectively, for GAAP financial information.
FY 2006
$ millions

12
U. S. Steel and Lone Star Technologies
Creates the leading North American supplier of OCTG products
•
Largest North American supplier of seamless and welded
pipe to energy sector
•
Leverages U.S. Steel’s production platform to drive operating
performance
Financially attractive:
•
Potential annual synergies in excess of $100 million by 2008
•
Accretive before synergies
•
Maintains financial flexibility post-transaction      
Transaction Summary

13
Additional Information
In
connection
with
the
proposed
merger,
Lone
Star
Technologies,
Inc.
intends
to
file
a
proxy
statement
and
related
materials
with
the
Securities
and
Exchange
Commission
(SEC).
The
documents
will
contain
important
information
about
the
proposed
merger,
and
the
shareholders
of
Lone
Star
are
urged
to
read
the
carefully
when
they
become
available.
These
documents,
when
filed
with
the
SEC,
will
be
available
for
free
at
the
SEC’s
website,
http://www.sec.gov
and
at
Lone
Star’s
website,
http://www.lonestartech.com.

Strategic Acquisition of
Lone Star Technologies, Inc.
March 29, 2007
©
United States Steel Corporation 2007