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
胡娟 1雷中钰 1刘金源1
作者信息
- 1. 宝武集团广东中南钢铁有限公司,广东韶关 512123
- 折叠
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.
Abstract
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 cast-ing 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 ℃.Meanwhile,the cooling speed of the rolled coil was controlled below 2℃/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 fine-ness 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Key words
SCM440 large coil/cold heading steel/standard part引用本文复制引用
出版年
2024
NETL
NSTL
万方数据