united states steel automotive solutions to light weighting - lbcg · 2015. 8. 18. · confidential...
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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