C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
75/118, 148/34
C21D 7/02 (2006.01) C21D 8/04 (2006.01) C22C 38/06 (2006.01) C22C 38/12 (2006.01) C21D 9/52 (2006.01)
Patent
CA 1229750
Abstract of the Disclosure A cold rolled dual-phase structure steel sheet having an excellent deep drawability is disclosed, which consists of ferrite phase and low temperature transformation product phase and comprises 0.001- 0.008 wt% of C, not more than 1.0 wt% of Si, 0.05-1.8 wt% of Mn, not more than 0.15 wt% of P, 0.01-0.10 wt% of A?, 0.002-0.050 wt% of Nb and 0.0005-0.0050 wt% of B provided that the value of Nb(%)+10B(%) is in a range of 0.010-0.080%, and, if necessary, 0.05-1.00 wt% of Cr and the balance being substantially Fe with inevitable impurities. This steel sheet is manufactured by hot and cold rolling a steel slab with the above chemical composition and continuously annealing the resulting steel sheet in such a manner than the steel sheet is heated and soaked at a temperature from .alpha.?y transforma- tion point to 1,000°C and then cooled at an average cooling rate of not less than 0.5°C/sec but less than 20°C/sec in a temperature range of from the soaking temperature to 750°C, and subsequently at an average cooling rate of not less than 20°C/sec in a temperature range of from 750°C to not more than 300°C.
449894
Hashimoto Osamu
Nishida Minoru
Obara Takashi
Satoh Susumu
Suzuki Hideo
Kawasaki Steel Corporation
Smart & Biggar
LandOfFree
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