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在实验室试制了低Si的C-Mn-Cr-Mo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100s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。
In the laboratory, a low-C-Mn-Cr-Mo cold-dip galvanized dual-phase steel of 800 MPa grade was trial-fabricated. The influences of coiling temperature, annealing temperature and annealing time on the microstructures Effect of mechanical properties. The test results show that: the test steel annealed at 820 ~ 850 ℃, heat insulation for more than 100s, the tensile strength can reach 800 MPa level above. As the annealing temperature increases, the strength increases, but the overall performance is best when the annealing temperature is 820 ℃. When annealed at 820 ℃, the strength of duplex steel increased significantly with the increase of holding time. When the holding time exceeded 100 s, the strength increased slowly. 690 ℃ high temperature coiling is conducive to obtaining the final good mechanical properties of duplex steel.