Cold rolled steel sheet and galvanized steel sheet having...

Details Cold rolled steel sheet and galvanized steel sheet having... Cold rolled steel sheet and galvanized steel sheet having...

2006-09-05

2006-09-05

Yee, Deborah (Department: 1742)

Metal treatment

Stock

Ferrous

C148S330000, C148S333000, C420S128000

Reexamination Certificate

active

07101445

ABSTRACT:
An object of the present invention is to provide a cold-rolled steel sheet and an alloyed hot-dip galvanized steel sheet in which tensile strength is effectively increased by press forming and heat treatment while maintaining excellent deep drawability in press forming. Specifically, a steel composition contains less than 0.01% of C, 0.005 to 1.0% of Si, 0.01 to 1.0% of Mn, 0.005 to 0.050% of Nb, 0.005 to 0.030% of Al, 0.005 to 0.040% of N, 0.0005 to 0.0015% of B, 0.05% or less of P, and 0.01% or less of S, the balance substantially composed of Fe, in which the following equations (1) and (2) are satisfied:in-line-formulae description="In-line Formulae" end="lead"?N %≧0.0015+14/93·Nb %+14/27·Al %+14/11·B %  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?C %≦(12/93)·Nb %.  (2)in-line-formulae description="In-line Formulae" end="tail"?

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