Title (en)

METHOD OF PRODUCING HIGH-STRENGTH COLD-ROLLED STEEL SHEET SUITABLE FOR WORKING

Publication

EP 0462380 A3 19931006 (EN)

Application

EP 91106841 A 19910426

Priority

JP 15985690 A 19900620

Abstract (en)

[origin: EP0462380A2] A method of producing a high-strength cold-rolled steel sheet suitable for working uses which utilizes a steel material having the following composition: not more than 0.02 wt% of C, not more than 1.0 wt% of Si, not more than 2.0 wt% of Mn, and not less than 0.01 wt% but not more than 0.10 wt% of Ti, the Ti, C and N contents being determined to meet the condition of Ti > (48/12) C wt% + (48/14) N wt%, the steel also consisting essentially of not less than 0.0010 wt% but not more than 0.0100 wt% of Nb, not less than 0.0002 wt% but not more than 0.0020 wt% of B, not less than 0.03 wt% but not more than 0.20 wt% of P, not more than 0.03 wt% of S, not less than 0.010 wt% but not more than 0.100 wt% of A l , not more than 0.008 wt% of N, not more than 0.0045 wt% of O, and the balance substantially Fe and incidental inclusions. The steel material is cast and hot-rolled and then subjected to a cold rolling conducted at a sheet temperature not higher than 300 DEG C under such a condition that the sum of the rolling reductions of passes which meet the following condition between said sheet temperature (T DEG C) and the strain rate epsilon /<.> (S<-><1>) is 50 % or greater: T x epsilon /<.> >/= 50,000 DEG C S<-><1> The steel sheet is then continuously annealed or galvannealed. <IMAGE>

IPC 1-7

C21D 8/04

IPC 8 full level

C21D 9/48 (2006.01); C21D 8/02 (2006.01); C21D 8/04 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/14 (2006.01)

CPC (source: EP KR)

C21D 8/04 (2013.01 - KR); C21D 8/0431 (2013.01 - EP); C22C 38/00 (2013.01 - KR); C21D 8/0436 (2013.01 - EP)

Citation (search report)

• [AD] EP 0295697 A2 19881221 - KAWASAKI STEEL CO [JP]
• [A] EP 0194118 A2 19860910 - KAWASAKI STEEL CO [JP]
• [A] GB 2111419 A 19830706 - NIPPON STEEL CORP
• [AD] PATENT ABSTRACTS OF JAPAN vol. 7, no. 91 (C-162)(1236) 15 April 1983 & JP-A-58 019 442 ( NIPPON KOKAN ) 4 February 1983
• [AD] PATENT ABSTRACTS OF JAPAN vol. 9, no. 52 (C-269)(1775) 6 March 1985 & JP-A-59 193 221 ( SHIN NIPPON SEITETSU ) 1 November 1984
• [A] PATENT ABSTRACTS OF JAPAN vol. 12, no. 316 (C-524)26 August 1988 & JP-A-63 086 819 ( KAWASAKI STEEL ) 18 April 1988

Designated contracting state (EPC)

BE DE ES FR GB IT NL

DOCDB simple family (publication)

EP 0462380 A2 19911227; EP 0462380 A3 19931006; EP 0462380 B1 19961113; AU 632228 B2 19921217; AU 7597191 A 19920102; CA 2041403 A1 19911221; CA 2041403 C 19970422; DE 69123088 D1 19961219; DE 69123088 T2 19970306; JP H0452230 A 19920220; JP H0756051 B2 19950614; KR 920000957 A 19920129; KR 930004809 B1 19930608

DOCDB simple family (application)

EP 91106841 A 19910426; AU 7597191 A 19910426; CA 2041403 A 19910429; DE 69123088 T 19910426; JP 15985690 A 19900620; KR 910007515 A 19910510