Cold rolled steel sheet and galvanized steel sheet having strain age hardenability and method of producing the same
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United States of America Patent
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app pub date -
Sep 4, 2003
filing date -
May 26, 2000
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Abandoned
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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: N %.gtoreq.0.00-15+4/93.multidot.Nb %+14/27.multidot.Al %+14/11.multidot.B % (1) C %.ltoreq.(12/93).multidot.Nb % (2)
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