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...

2006-06-27

2006-06-27

Yee, Deborah (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S652000, C148S603000

Reexamination Certificate

active

07067023

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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