Steel sheet

Details Steel sheet Steel sheet

2007-08-07

2007-08-07

Yee, Deborah (Department: 1742)

Metal treatment

Stock

Ferrous

C148S332000, C148S334000, C148S335000, C148S336000, C428S659000

Reexamination Certificate

active

10792546

ABSTRACT:
A steel sheet containing 0.004 to 0.02% C, 1.0% or less Si, 0.7 to 3.0% Mn, 0.02 to 0.15% P, 0.02% or less S, 0.01 to 0.1% Al, 0.004% or less N, 0.2% or less Nb, by mass %, optionally Ti, Bi or at least one element selected from the group consisting of Cr Mo, Ni and Cu, and the balance being Fe; the Nb content satisfying a formula ofin-line-formulae description="In-line Formulae" end="lead"?(12/93)×Nb*/C≧1.0,in-line-formulae description="In-line Formulae" end="tail"?wherein Nb*=Nb−(93/14)×N, and wherein C, N and Nb designate the content in mass % of carbon, nitrogen and niobium, respectively; and a yield strength and an average grain size of the ferritic grains which satisfy a formula ofin-line-formulae description="In-line Formulae" end="lead"?YP≦−120×d+1280,in-line-formulae description="In-line Formulae" end="tail"?wherein YP designates yield strength in MPa, and d designates an average size of ferritic grains in μm.

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