在实验室试制了低Si 的CMnCrMo系的800 MPa级冷轧热镀锌双相钢，研究了卷取温度、退火温度、退火时间等工艺参数对双相钢微观组织和力学性能的影响。试验结果表明：试验用钢在820~850 ℃退火，保温100 s以上，抗拉强度可以达到800 MPa级以上。随着退火温度的升高，强度升高，但综合性能以退火温度为820 ℃时为最佳。在820 ℃退火时，随着保温时间的增加，双相钢的强度显著增加，当保温时间超过100 s以后，强度增加缓慢。690 ℃高温卷取有利于获得最终力学性能良好的双相钢组织。
800 MPa class cold rolling hot dip galvanized dual phase steels based on low Si and CMnCrMo alloy system were pilot produced in laboratory. Effect of processing parameters including coiling temperature, annealing temperature and soaking time on microstructures and properties of dual phase steel were studied. The experimental results show that annealed at 820850 ℃,soaking time surpasses 100 s, tensile strength of experimental steel can reach above 800 MPa. The strength of experimental steel increases with the annealing temperature steps up. The synthetical mechanical properties of dual phase steel which annealed at 820 ℃ is the best. When annealed at 820 ℃, the strength of obtained steel dramatically increases with the soaking time. But when soaking time surpasses 100 s, the strength increases slowly. When the coiling temperature is 690 ℃, dual phase steel which has good mechanical properties can be obtained after annealing.
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