C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/10
C21D 8/04 (2006.01) C22C 38/14 (2006.01)
Patent
CA 1202551
Abstract of the Disclosure A METHOD OF MANUFACTURING COLD ROLLED STEEL SHEETS FOR EXTRA DEEP DRAWING WITH AN EXCELLENT PRESS FORMABILITY A method of manufacturing cold rolled steel sheets for extra deep drawing is disclosed, which comprises the steps of: melting and continuously casting a steel material containing not more than 0.0060% of C, 0.01 to less than 0.10% of Mn, 0.005-0.10% of A?, Ti corresponding to Ti(%) of the following equation (1) when an effective Ti amount expressed by Ti* in the formula (1) satisfies the following inequality (2), and optionally, 0.005?0.2% in total of at least one of Cu, Ni and Cr to obtain a cast slab; hot rolling the cast slab immediately or after the slab is heated at a temperature of 900-1,150°C, during which a hot finishing temperature is made to not more than 780°C; cold rolling the hot rolled sheet in the usual manner; and recrystallization annealing the cold rolled sheet at a temperature of not less than the recrystallization temperature but not more than 1,000°C. Ti-*(%) = Ti(%) - Image - Image ... (1) 4.0 x C(%) ? Ti*(%) ? 0.10 ... (2)
440636
Sato Hirotake
Takasaki Junsuke
Yasuda Akira
Kawasaki Steel Corporation
Smart & Biggar
LandOfFree
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