冷镦标准件用SCM440热轧大盘卷的研发  

Development of SCM440 hot rolled large coil for cold heading standard parts

作　　者：胡娟 雷中钰 刘金源 HU Juan;LEI Zhongyu;LIU Jinyuan(BAOWU Zhongnan Iron&Steel Co.,Ltd.,Shaoguan 512123,China)

机构地区：[1]宝武集团广东中南钢铁有限公司,广东韶关512123

出　　处：《物理测试》2024年第4期1-5,共5页Physics Examination and Testing

摘　　要：介绍了高级别冷镦标准件用SCM440热轧大盘卷的生产工艺、过程控制及质量情况。炼钢过程严格控制转炉冶炼、LF+RH精炼、连铸工艺,以保证钢的化学成分和纯净度;轧制过程采用水冷控制,保证盘卷的卷取温度在840~870℃,同时通过保温罩开闭和风机风量来控制轧后盘卷冷却速度在2℃/s以下。经过检验,φ26 mm规格SCM400大盘卷热轧态组织为贝氏体+珠光体+铁素体,晶粒度为9~10级,总脱碳层比例不大于1%,1/2冷顶锻合格率为100%,结果表明,SCM440大盘卷完全能够满足12.9级冷镦钢加工使用要求。The production technology,process control and quality of SCM440 hot rolled coil for high grade cold heading standard parts were introduced.In the steelmaking process,the converter smelting,LF+RH refining,and continuous casting processes should be strictly controlled to ensure the chemical composition and purity of steel.Water cooling was adopted in the rolling process to maintain the coiling temperature at 840-870 C.Meanwhile,the cooling speed of the rolled coil was controlled below 2 C/s through the adjustments in insulation cover opening/closing and fan air volume.According to the testing,the hot rolled structure of φ26 mm SCM440 hot rolled large coil was bainite+perlite+ferrite with a grain fineness number of 9-10.Additionally,the ratio of total decarburization layer was≤1%,and the pass rate for 1/2 cold forging was 100%.The results indicated that SCM440 large coil could fully meet the processing requirements of grade 12.9 cold heading steel.

关 键 词：SCM440大盘卷 冷镦钢 标准件 

分 类 号：TG335.11[金属学及工艺—金属压力加工]