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AssigneeJFR Steel Corporation, a corporation of Japan
InventorsTakayuki Futatsuka, Tatsuya Nakagaito, Hiroshi Matsuda, Yasunobu Nagataki, Yutaka Awajiya
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An alloyed hot-dip galvanized steel sheet has a composition containing about 0.05 to about 0.25 wt % of C, about 0.5 wt % or less of Si, about 1 to about 3 wt % of Mn, about 0.1 wt % or less of P, about 0.01 wt % or less of S, about 0.1 to about 2 wt % of Al, and less than about 0.005 wt % of N, and satisfying the relations, Si+Al≧0.6 wt %, (0.0006×Al) wt %≦N≦(0.0058−0.0026×Al) wt %, and Al≦(1.25×C0.5−0.57×Si+0.625×Mn) wt %, the balance including Fe and inevitable impurities. The alloyed hot-dip galvanized steel sheet can be obtained without passing through a complicated process, has excellent surface appearance and anti-secondary work embrittlement and high strength, and is thus suitable for application to an automobile steel sheet.
An alloyed hot-dip galvanized steel sheet comprising a composition containing about 0.05 to about 0.25 wt % of C, about 0.5 wt % or less of Si, about 1 to about 3 wt % of Mn, about 0.1 wt % or less of P, about 0.01 wt % or less of S, about 0.1 to about 2 wt % of Al, and less than about 0.005 wt % of N, and satisfying the relations, Si+Al≧0.6 wt %, (0.0006×Al) wt %≦N≦(0.0058−0.0026×Al) wt %, and Al≦(1.25×C0.5−0.57×Si+0.625×Mn) wt %, the balance including Fe and inevitable impurities.
Dependencies are inferred from the claim text.