The invention belongs to the technical field of cold rolled steel and discloses
zinc-plated double-phase steel and a production method of the
zinc-plated double-phase steel. The
zinc-plated double-phase steel comprises, by weight percentage, 0.085%-0.115% of C, 0.15%-0.24% of Si, 1.45%-1.55% of Mn, not larger than 0.015% of P, not larger than 0.005% of S, 0.025%-0.065% of Alt, 0.14%-0.24% of Cr, 0.24%-0.29% of Mo, not larger than 0.006% of N and the balance Fe and other inevitable impurities. The production method includes the steps of KR desulfuration, converter
steelmaking, LF+RH refining treatment, RH
calcium treatment, continuous steel casing, billet heating, rough rolling, finish rolling,
laminar cooling and winding; unwinding, acid
pickling, cold
continuous rolling and winding; and unwinding, cleaning, annealing, zinc plating, finishing and winding. Through composition design and
process control, the zinc-plated double-phase steel is suitable for annealing production lines having the rapid cooling segment or not.