High strength hot-dip galvanized steel sheet and method for...

Details High strength hot-dip galvanized steel sheet and method for... High strength hot-dip galvanized steel sheet and method for...

2005-03-22

2005-03-22

Yee, Deborah (Department: 1742)

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

C148S533000, C148S333000

Reexamination Certificate

active

06869691

ABSTRACT:
The invention relates to a high strength hot-dip galvanized steel sheet consisting essentially of 0.03 to 0.25% C, 0.7% or less Si, 1.4 to 3.5% Mn, 0.05% or less P, 0.01% or less S, 0.05 to 1% Cr, 0.005 to 0.1% Nb, by mass, and balance of Fe, and being made of a composite structure of ferrite and secondary phase, and having an average grain size of the composite structure of 10 μm or smaller. Since the high strength hot-dip galvanized steel sheet of the present invention hardly induces softening at HAZ during welding, it is applicable to structural members of automobiles for “Tailor Welded Blanks” (TWB).

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