汽车用440 MPa级加磷高强IF钢的研制  

Development of 440 MPa Grade Phosphorous High-strength IF Steel for Automobile

作　　者：张奇 路璐 吴蒙 Zhang Qi;Lu Lu;Wu Meng(Inner Mongolia Baotou Steel Rare Earth Steel Plate Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China)

机构地区：[1]内蒙古包钢稀土钢板材有限责任公司,内蒙古包头014010

出　　处：《包钢科技》2022年第1期53-56,共4页Science & Technology of Baotou Steel

摘　　要：包钢自主研发的440 MPa级加磷高强IF钢在超低碳钢的基础上通过添加Si、Mn、P等合金元素提高强度,其成分及生产工艺控制要求严格,生产难度大。文章重点研究了化学元素对440 MPa级高强IF钢冲压性能的影响,采用金相显微镜、扫描电镜分析了钢带的微观组织、夹杂物形态及第二相粒子析出行为,解释了热轧工艺如终轧温度与卷取温度、冷轧连续退火工艺对微观组织及力学性能的作用机理。通过制定合理的工艺路线,并进行严格控制,试验钢带力学性能稳定且满足相关技术要求。The strength of 440 MPa grade phosphorous high-strength IF steel independently developed by Baotou Steel is improved by adding such alloying elements as Si,Mn and P based on ultra low carbon steel.The control requirements of its composition and production process are strict as well as production is very difficult.In the paper,the influences of chemical elements on stamping performance of 440 MPa grade high-strength IF steel are mainly studied.The microstructure of steel strip,inclusion morphology and precipitation behavior of the second phase particles are analyzed with metalloscope and scanning electron microscope.The mechanisms of action of hot rolling processes such as finishing and coiling temperatures,continuous annealing process of cold rolling on microstructure and mechanical properties are explained.The mechanical performances of tested steel strip are stable and could meet the relative technical requirements through formulating reasonable process route and strict control.

关 键 词：加磷高强IF钢 微观组织 汽车 

分 类 号：TG335.53[金属学及工艺—金属压力加工]