DH36海洋平台用钢探伤不合格原因分析及工艺改进
Cause analysis of flaw detection disqualification of steel for DH36 offshore platform and process improvement
李伟 1年义 2李家乐 2宗有成 2张立强2
作者信息
- 1. 宝武集团鄂城钢铁公司,湖北鄂州 436000
- 2. 安徽工业大学冶金工程学院,安徽马鞍山 243000
- 折叠
摘要
利用超声波探伤技术对轧制后的钢板进行了全面检测,系统性地分析了探伤不合格的原因.阐述了裂纹的成因,以及Nb、Ti等夹杂物来源,揭示了这些缺陷的微观结构和宏观表现.采用KR铁水脱硫:铁水采用全扒渣工艺,进站铁水目标硫的质量分数不大于0.005％,铁水温度不低于1 340 ℃,转炉复合吹炼全程吹氩,终点碳成分控制在0.04％～0.06％,采用滑板挡渣操作,出钢时间不小于4 min等.这些措施的实施对于保障海洋平台用钢的安全性和可靠性具有重要意义,同时也为钢铁行业的质量控制提供参考.
Abstract
Utilizing ultrasonic flaw detection technology,a comprehensive inspection was conducted on steel plates after rolling,and a systematic analysis was performed to identify the causes of flaw detection.The causes of cracks and inclu-sions result from Nb and Ti were elaborated,revealing the microstructures and maromorphology of these defects.Adopting KR hot metal desulfurization:The hot metal adopts a full slag removal process,with the incoming S less than 0.005％,hot metal temperature more than 1 340 ℃,converter compound blowing throughout the process with argon,endpoint carbon content controlled between 0.04％-0.06％,utilizing a slide gate for slag retention,and a steel tapping time more than 4 minutes,etc.The implementation of these measures is vital for ensuring the safety and reliability of steel used in ocean platforms and contributes to quality control in the steel industry.
关键词
海洋平台用钢/探伤/夹杂/裂纹Key words
steel for offshore platform/flaw detection/inclusion/crack引用本文复制引用
出版年
2024
NETL
NSTL
万方数据