冷轧980 MPa级马氏体钢产品研发

Research and Development of Cold Rolled 980 MPa Martensitic Steel Product

文章根据冷轧980 MPa级马氏体钢技术要求进行了化学成分和生产工艺设计,并采用中试平台开展了冷轧980 MPa级马氏体钢实验室退火工艺研究。研究结果表明,采用相同化学成分及轧制工艺生产的冷轧980 MPa级马氏体钢通过调整退火缓冷温度得到的产品屈服强度为750~940 MPa,抗拉强度达到1020 MPa以上,延伸率在10%以上,满足技术要求。明确了缓冷温度对冷轧980 MPa级马氏体钢组织性能的影响规律,结合显微组织及成品机械性能确定该成分体系下均热温度为800℃、缓冷冷速为3℃/s、快冷冷速为45℃/s、快冷温度为280℃时,最佳缓冷温度为680℃。

In this paper,the chemical composition and production process are designed according to the technical requirements of cold rolled 980 MPa martensitic steel as well as the study of its annealing process in laboratory is carried out with pilot-scale test platform.The study results showed that the yield strength was 750~940 MPa,tensile strength reached over 1020 MPa and elongation was over 10%for the products of cold rolled 980 MPa martensitic steel produced with the same chemical composition and rolling process through adjusting the slow cooling temperature of annealing,which could meet technical requirements.The effect laws of slow cooling temperature on microstructure and properties of cold rolled 980 MPa martensitic steel are clear and definite as well as the soaking temperature is determined to be 800℃,slow cooling rate is determined to be 3℃/s,rapid cooling rate is determined to be 45℃/s and the optimum slow cooling temperature is determined to be 680℃when rapid cooling temperature is 280℃with the composition system combining with the microstructure and mechanical properties of finished products.