C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/00 (2006.01) C21D 8/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/12 (2006.01) C22C 38/42 (2006.01) C22C 38/44 (2006.01) C23C 2/02 (2006.01)
Patent
CA 2231760
A cold-rolled steel strip or hot-dip coated cold-rolled steel strip for use as a fire-proof building member has composition consisting of 0.01-0.25 wt.% C, up to 1.5 wt.% Si, 0.05-2.5 wt.% Mn, up to 0.1 wt.% P, no more than 0.02 wt.% S, 0.005-0.1 wt.% Al, 0.05-1.0 wt.% Mo, optionally 0.005-0.2 wt.% one or more selected from Ti, Nb, V and W, optionally one or more of 0.05-0.6 wt.% Cu, 0.05-0.6 wt.% Ni, 0.05-3.0 wt.% Cr and 0.0003-0.003 wt.% B and the balance being essentially Fe except inevitable impurities. The cold-rolled steel strip is manufactured by hot-rolling, acid-pickling, cold-rolling and then annealing at a temperature above its recrystallization temperature but below 950°C . The hot-dip coated cold-rolled steel strip is manufactured in the same way but in-line heating a cold-rolled steel strip at a temperature above its recrystallization temperature but below 950°C and then immersing it into a coating bath. The annealed or hot-dip coated steel strip may be further cold-rolled with such a slight duty to induce a plastic strain of 1-5%.
Fujita Toru
Hamanaka Seiichi
Higo Yuichi
Nisshin Steel Co. Ltd.
Ridout & Maybee Llp
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