High strength galvannealed steel sheet excellent in...

Details High strength galvannealed steel sheet excellent in... High strength galvannealed steel sheet excellent in...

2002-12-26

2008-08-19

La Villa, Michael (Department: 1794)

Coating processes

Immersion or partial immersion

Molten metal or fused salt bath

C148S320000, C072S199000, C072S200000, C072S201000, C029S017200

Reexamination Certificate

active

07413780

ABSTRACT:
Galvannealed steel sheet simultaneously able to achieve excellent workability and high strength and a method of production of the same are provided as an objective, in particular high strength galvannealed steel sheet excellent in workability, comprising high strength steel sheet containing, by mass %, C: 0.05 to 0.15%, Si: 0.3 to 2.0%, Mn: 1.0 to 2.8%, P: 0.03% or less, S: 0.02% or less, Al: 0.005 to 0.5%, and N: 0.0060% or less and a balance of Fe and unavoidable impurities, where, when % C, % Si, and % Mn respectively represent the C, Si, and Mn contents, (% Mn)/(% C)≧12 and (% Si)/(% C)≧4 being satisfied, on the surface of which having a galvannealed layer containing Al: 0.05 to 0.5 mass % and Fe: 5 to 15 mass % and a balance of Zn and unavoidable impurities, said steel sheet satisfying a relationship of tensile strength F (MPa) and elongation L (%) of L≧52−0.035×F.

REFERENCES:
patent: 6306527 (2001-10-01), Ikeda et al.
patent: 1 160 346 (2001-12-01), None
patent: 11-279691 (1999-10-01), None
patent: 2001-140022 (2001-05-01), None
patent: WO 02/055751 (2002-07-01), None

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