4130M-QT-125K大直径厚壁机械用无缝钢管的开发  

Development of Large-sized,Heavy-wall 4130M-QT-125K Mechanical Structure Seamless Steel Tube

作　　者：安健波[1] 许金玲[1] 邵立强[1] 文玉成[1] 

机构地区：[1]天津钢管集团股份有限公司,天津300301

出　　处：《钢管》2016年第6期15-19,共5页Steel Pipe

摘　　要：介绍了4130M-QT-125K大直径厚壁机械用无缝钢管的化学成分、炼钢-连铸、轧管和热处理等工艺的设计情况，总结了生产过程中的工艺控制要点。实践证明：生产的4130M-QT-125K大直径厚壁机械用无缝钢管，其工艺设计合理，几何尺寸控制精度高；钢管强度、韧性指标稳定，屈服强度Rt0.65在890～1020MPa，抗拉强度Rm≥960MPa，断后伸长率A≥18％，断面收缩率Z≥50％，0℃冲击吸收功≥60J，剪切断面率≥80％，全壁厚洛氏硬度在33～37HRC，各项性能指标达到或超过了客户协议要求。Described here in the article are the designs of the large-sized, heavy-wall 4130M-QT-125K mecha- nical structure seamless steel tube, involving chemical composition, and processes of steel-melting/casting, pipe- rolling and heat treatment, etc. Also summarized are the control tips for manufacturing the said tube. Relevant opera- tion practice demonstrates that manufacturing process as designed for the large-sized, heavy-wall 4130M-QT-125K mechanical structure seamless steel tube is reasonable, and the tube itself is in possession of such characteristics as high controlled-dimensional tolerance, consistent strength and toughness, yield strength： Rt0.65 under 890-1 020 MPa, tensile strength： Rm≥960, after-fracture elongation： A ≥18%, reduction of area： Z≥50%, impact energy absorption at 0 ℃： ≥60 J, shearing area rate： ≥80%, and full wall thickness Rockwell hardness： 33-37 HRC. All the property values are up to or even over relevant agreed requirements.

关 键 词：无缝钢管 机械用管 高钢级 大规格 机械加工 热处理 力学性能 

分 类 号：TF76[冶金工程—钢铁冶金] TG335[金属学及工艺—金属压力加工] TG161