摘要
针对4130X气瓶钢管内壁凹坑缺陷的产生原因,对气瓶钢管进行了化学成分分析、力学性能试验和非金属夹杂物检测,同时对凹坑处进行了金相组织、扫描电镜及能谱分析。结果表明:钢材冶炼和浇注环节正常,凹坑缺陷非钢质缺陷所致,而是产生于热成形之后的冷拔工序。凹坑的产生是由于氧化铁皮或其他硬质夹杂物在拔制过程中压入了钢管表面,或是原存在于钢管表面的翘皮剥落。制作过程应严格把控冷拔前的准备工作,以防类似缺陷重复发生。
Regarding the causes of pit defects on the inner wall of 4130X gas cylinder steel pipes,chemical composition analysis,mechanical property tests and non-metallic inclusion inspections were carried out on the gas cylinder steel pipes.Meanwhile,metallographic structure analysis,scanning electron microscope(SEM)and energy spectrum analysis were performed on the pits.The results show that the steel smelting and pouring processes were normal,and the pit defects were not caused by steel quality defects but were generated during the cold drawing process after hot forming.The pits were formed because iron oxide scale or other hard inclusions were pressed into the surface of the steel pipe during the drawing process,or the peeling of the lifting skin that originally existed on the surface of the steel pipe.During the manufacturing process,the preparatory work before cold drawing should be strictly controlled to prevent the recurrence of similar defects.
作者
谭明
张新文
沈钊
庞德禹
刘永
TAN Ming;ZHANG Xinwen;SHEN Zhao;PANG Deyu;LIU Yong(Yangzhou Chengde Steel Pipe Co.,Ltd.,Yangzhou 225000,Jiangsu,China;Jiangsu Yonggang Group Co.,Ltd.,Zhangjiagang 215600,Jiangsu,China;Yangzhou Chengde Heavy Industries Co.,Ltd.,Yangzhou 225000,Jiangsu,China)
关键词
4130X
气瓶钢管
内壁凹坑
冷拔
4130X
gas cylinder steel pipes
pit defects on the inner surface
cold-drawn
