C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 8/04 (2006.01) B21B 39/20 (2006.01) C22C 38/12 (2006.01)
Patent
CA 2097900
In a method of producing a high-strength cold-rolled steel sheet excelling in deep drawability, a steel material is used which consists of: a basic composition including 0.01% or less of C, 0.1 to 2.0% of Si, 0.5 to 3.0% of Mn, 0.02 to 0.2% of P, 0.05% or less of S, 0.03 to 0.2% of Al, 0.01% or less of N, 0.001 to 0.2% of Nb, and 0.0001 to 0.008% of B in such a way that the respective contents of C, Nb, Al, N, Si, Mn and P satisfy the following formulae: 5 ~ Nb/C ~ 30, 10 ~ Al/N ~ 80, and 16 ~ (3 x Si/28 + 200 x P/31)/(Mn/55) ~ 40; Fe remnant; and inevitable impurities, the method including the steps of: performing rolling on the steel material with a total reduction of 50% or more and 95% or less while effecting lubrication thereon in a temperature range of not higher than the Ar3 transformation temperature and not lower than 500°C; performing a hot-rolled sheet recrystallization treatment on the steel material by a coiling or annealing process; performing cold rolling on the steel material with a reduction of 50 to 95%; and then effecting recrystallization annealing on the steel material in a temperature range of 700 to 950°C.
ans le cadre d'une méthode pour produire des feuilles d'acier laminées à froid et de résistance élevée ayant d'excellentes propriétés d'étirage, on emploie un produit d'acier constitué : d'une composition comprenant 0,01 % ou moins de C, 0,1 à 2 % de Si, 0,5 à 3 % de Mn, 0,02 à 0,2 % de P, 0,05 % ou moins de S, 0,03 à 0,2 % d'Al, 0,01 % ou moins de N, 0,001 % à 0,2 % de Nb et 0,0001 à 0,008 % de B de manière à ce que les teneurs respectives en C, en Nb, en Al, en N, en Si, en Mn et en P répondent à la formule suivante :5
Kato Toshiyuki
Kawabe Hidetaka
Matsuoka Saiji
Sakata Kei
Yasuhara Eiko
Kawasaki Steel Corporation
Smart & Biggar
LandOfFree
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