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

Claim 0:
1. A multiphase steel tinned raw plate, having 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 multiphase steel tinned raw plate has a structure consisting of ferrite grains, pearlite, martensite and cementite particles,
wherein the pearlite, martensite, and cementite particles in the structure of the multiphase steel tinned raw plate have a volume fraction of 5-20%, and the martensite in the structure of the multiphase steel tinned raw plate has a volume fraction of equal to or higher than 1% to less than 5%; and
wherein, after baking at 150-300° C. for 15-60 min, the multiphase steel tinned raw plate has a yield strength Rp0.2≥(400+12×DCR)MPa, and an elongation A≥(25−1.2×DCR) %, wherein DCR represents a reduction rate of double cold reduction, wherein 5%≤DCR≤18%.