CONFIDENTIAL – United States Steel Corporation

United States Steel Automotive Solutions to Light Weighting

August 18, 2015

CONFIDENTIAL – United States Steel Corporation CONFIDENTIAL – United States Steel Corporation

•  Founded in 1901 •  Largest integrated steel producer headquartered

in the United States, with additional operations in Central Europe

•  24.4 million net tons annually •  Employ more than 35,000 globally

•  Operate coke making, steelmaking and flat-rolled and tubular finishing facilities throughout the eastern half of the United States.

•  North America’s largest flat roll producer for sheet and tin

•  Offer customers a significant commitment to Research & Development with four major research facilities

United States Steel Corporation

CONFIDENTIAL – United States Steel Corporation

U. S. Steel Automotive Strategies Caption,

image or bullet points here (Arial Bold Italic, 18pt, Dark Blue)

U. S. Steel Automotive Solutions

•  Create long term strategic relationships with our customers

•  Co-develop engineered solutions with our customers using cutting edge steels for optimized performance

•  Continue to push the boundaries of grade development at R&D and shorten time to market

•  Develop products to help our customers meet increasingly stringent safety and fuel efficiency requirements

CONFIDENTIAL – United States Steel Corporation

Current & Future State of AHSS Grades

CONFIDENTIAL – United States Steel Corporation CONFIDENTIAL – United States Steel Corporation

U. S. Steel CR 1180 SHF

Gen 1+ Products provide solutions

•  1180 SHF is a TRIP Assisted Bainite Ferrite grade with the approximate properties:

•  YS ≈ 900 MPa •  UTS ≈ 1,230 MPa •  Total Elongation = 14% min. •  UTS x TE ≈ 17,200 MPa-%

•  1180 SHF may not be a true Gen 3 material but it can replace PHS 1500 at a lower cost

CONFIDENTIAL – United States Steel Corporation

IIHS Side Impact Model – U. S. Steel BIW

1180SHF (1.6mm)

1180SHF (1.2mm)

CONFIDENTIAL – United States Steel Corporation

Forming Effect

Plastic strain Thickness

1180SHF (1.6mm)

1180SHF (1.2mm)

CONFIDENTIAL – United States Steel Corporation

IIHS Side Impact – SHF 1180

CONFIDENTIAL – United States Steel Corporation CONFIDENTIAL – United States Steel Corporation

U. S. Steel CR Gen 3 980 Characterization

•  Extensive characterization has been completed o  Bendability is exceptional (less than 1.0 rating for V-bend test), with hole

expansion values in the 30 – 35 % range o  Weld evaluations completed with good results o  Phosphating treatments completed with good results o  LDH (limiting dome height) testing completed with the 980G3 material

performing better than 590DP, 780T, and 980DP o  Successful stamping trials performed

•  Commercially available 0.9mm – 2.2mm cold rolled and EG •  ASTM-L properties: •  YS ≈ 620 MPa •  UTS ≈ 1,000 MPa •  TE ≈ 24 % •  UTS * TE ≈ 24,000

CONFIDENTIAL – United States Steel Corporation

U. S. Steel CR Gen 3 980 Forming Limit Diagram

0

20

40

60

80

100

120

-60 -40 -20 0 20 40 60

Maj

or T

rue

Stra

in

Minor True Strain

DP980

DP590

980G3

CONFIDENTIAL – United States Steel Corporation CONFIDENTIAL – United States Steel Corporation

U. S. Steel CR Gen 3 780 Product Preview

CR 780 Gen 3 product in mill for qualification and commercial validation

•  YS ≈ 600 MPa •  UTS ≈ 850 MPa •  Uniform Elongation ≈ 28% •  Total Elongation ≈ 36% •  UTS x TE ≈ 31,700 MPa-% •  Hole Expansion Ratio ≈ 55%

CONFIDENTIAL – United States Steel Corporation 12

Global Formability Measures

28.0

21.6 21.7 20.1 17.4

15.1

33.0

13.7 13.6 15.5

24.0

14.0

0.0 5.0

10.0 15.0 20.0 25.0 30.0 35.0

Total Elongation

0.164

0.149 0.157

0.188

0.135 0.102

0.200

0.107 0.100

0.092

0.170

0.100

0.000

0.040

0.080

0.120

0.160

0.200

0.240

n-Value

CONFIDENTIAL – United States Steel Corporation 13

More Comprehensive View of AHSS Formability Using both Global and Local Formability Measures

MS  1500 980  Gen  3

1180  SHF DP  780

590R

980  HD  MP  LCE

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0 5 10 15 20

Fracture  Resistance

%  Uniform  Elongation

"LOCAL"FORMABILITY

BALANCED/LOCAL

BALANCED/GLOBAL

"GLOBAL"FORMABILITY

980 TBF

980 CR  MP  LCE1180  DP

CONFIDENTIAL – United States Steel Corporation CONFIDENTIAL – United States Steel Corporation

Generation 3 Steels - Purchasing Strategy Impact

A “one size fits all” approach will not work for purchasing Generation 3 steels

•  Specifying mechanical properties and chemistry alone is insufficient

•  Up front interaction to understand application-specific needs is critical

•  U. S. Steel has the ability to customize grades for individual customer applications forming requirements

CONFIDENTIAL – United States Steel Corporation

United States Steel Automotive Solutions to Light Weighting

August 18, 2015