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AssigneeUnited States Steel Corporation
InventorsDaniel James Branagan, Alla V. Sergueeva, Brian E. Meacham, Andrew E. Frerichs, Sheng Cheng, Scott T. Larish, Grant G. Justice, Andrew T. Ball, Craig S. Parsons, Logan J. Tew, Scott T. Anderson, Kurtis R. Clark, Taylor L. Giddens, Tad V. Machrowicz, Jonathan M. Cischke
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This disclosure relates to weldability of steel alloys that provide weld joints which retain hardness values in a heat affected zone adjacent to a fusion zone and which also have improved resistance to liquid metal embrittlement due to the presence of zinc coatings.
A welded high strength steel sheet comprising 70 to 90 atomic % iron, one or both of Ni in an amount of from 0.4 to 11.6 at. % and Cu in an amount of from 0.4 to 2.8 at. %, and at least two elements selected from Si in an amount of from 0.7 to 6.5 at. %, Mn in an amount of from 0.8 to 16.0 at. %, Cr in an amount of from 0.4 to 8.8 at. % and C in an amount of from 0.4 to 3.8 at. %, wherein the steel sheet has a thickness of up to 5 mm, a total elongation of from 10.0 to 75.0%, a yield strength of from 250 to 1200 MPa, a tensile strength of from 700 to 1700 MPA, and a hardness H1, and wherein the steel sheet includes a weld zone comprising:
Dependencies are inferred from the claim text.