Patent ID: 11891674
Assignee: BAOSHAN IRON & STEEL CO., LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 6:
7. A method for manufacturing the multiphase steel tinned raw plate of claim 1, wherein the tinned raw plate has a chemical composition consisting of, by mass percentage, C: 0.081-0.14%, Mn: 0.2-0.8%, Al: 0.01-0.09%, P: 0.01-0.03%, N: 0.002-0.015%, Cu: 0.005-0.03%, one or more elements selected from the group consisting of B: 0.001-0.005%, Cr: 0.005-0.05%, Ti: 0.001-0.1%, Nb: 0.001-0.2%, and Mo: 0.001-0.008%, and a balance of Fe and unavoidable impurities, wherein the following relationship is met: 0.21%≤Mn+1.3Cr+3.2Mo+0.5Cu≤0.91%, wherein the tinned raw plate is subjected to continuous annealing and double cold reduction in sequence, wherein a temperature T in the continuous annealing stage is (727−100×C−30×Mn−1000×N)° 800° C.; a holding time is 30 s-50 s; a cooling rate in a zone having a temperature of 250° C. or higher is 50-90° C./s; wherein a reduction rate of the double cold reduction DCR is 5%≤DCR≤18%.