Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Reexamination Certificate
2005-06-28
2005-06-28
Koehler, Robert R. (Department: 1775)
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
C428S939000, C148S533000, C148S534000
Reexamination Certificate
active
06911268
ABSTRACT:
Disclosed are a high strength hot-dip galvanized or galvannealed steel sheet, which has improved press formability and plating adhesion and is useful as a member for automobile, building, electric or other members, and a process for producing the same.This high strength hot-dip galvanized or galvannealed steel sheet comprises: (a) a steel sheet substrate comprising, by weight, carbon (C): 0.05 to 0.2%, silicon (Si): 0.2 to 2.0%, manganese (Mn): 0.2 to 2.5%, and aluminum (Al): 0.01 to 1.5%, the silicon and the aluminum having a mutual relationship represented by formula 0.4(%)≦Si+0.8 Al (%)≦2.0(%), the steel sheet substrate further comprising at least one member selected from the group consisting of (i) 0.003 to 1.0% of tin (Sn), (ii) 0.005 to 1.0% in total of at least one member selected from antimony (Sb), bismuth (Bi), and selenium (Se), (iii) 0.005 to 1.0% in total of at least one member selected from beryllium (Be), magnesium (Mg), calcium (Ca), and zirconium (Zr), and (iv) 0.005 to 1.0% in total of at least one member selected from scandium (Sc), yttrium (Y), lanthanum (La), and cerium (Ce), with the balance consisting of iron (Fe) and unavoidable impurities, the volume fraction of retained austenite in the steel structure being 2 to 20%; and (b) a zinc (Zn) coating layer provided on said steel sheet substrate.
REFERENCES:
patent: 6517955 (2003-02-01), Takada et al.
patent: 11-279682 (1999-10-01), None
patent: 11-279691 (1999-10-01), None
K. Eberle, et al., “New thermomechanical strategy for production of high strength low alloyed multiphase steel showing transformation induced plasticity effect”, Ironmaking & Steelmaking, vol. 26, No. 3, received on Oct. 5, 1999, (at JICST), pp. 176-181.
Senuma Takehide
Suehiro Masayoshi
Takada Yoshihisa
Koehler Robert R.
Nippon Steel Corporation
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