4130X连铸开浇炉钢管探伤不合格原因分析  

Cause analysis of flaw detection unqualified of 4130X continuous casting open cast furnace steel pipe

作　　者：张新文[1] 施嘉凯 张春香 陈凯 轩康乐 ZHANG Xinwen;SHI Jiakai;ZHANG Chunxiang;CHEN Kai;XUAN Kangle(Special Steel Company,Jiangsu Yonggang Group Co.,Ltd.,Suzhou 215628,China;Product R&D Center,Jiangsu Yonggang Group Co.,Ltd.,Suzhou 215628,China)

机构地区：[1]江苏永钢集团有限公司特钢公司,江苏苏州215628 [2]江苏永钢集团有限公司产品研发中心,江苏苏州215628

出　　处：《物理测试》2023年第1期40-45,共6页Physics Examination and Testing

摘　　要：分析了4130X气瓶钢管探伤不合格的原因为开浇炉二次氧化引起非金属夹杂物。以?500 mm规格连铸圆坯4130X为研究对象,从距勾头不同位置取样,研究氧含量、氮含量、Al损耗、非金属夹杂物等指标的变化规律,发现距离勾头部位越近,氧含量、氮含量越高,Al损耗越大,非金属夹杂物中B类、D类、DS类级别越高,说明开浇阶段钢液二次氧化程度相当严重。另外,研究发现,距离勾头越近,长度5μm及以上的含Al非金属夹杂物分布密度越大,说明开浇时钢液的二次氧化对5μm以上的夹杂物影响较大。It pointed out that the reason for flaw detection unqualified of 4130X steel pipe was the nonmetallic inclusions caused by secondary oxidation of open cast furnace.Take?500 mm continuous casting blank as the object,several samples were taken from different positions of the casting blank.It was found that the oxygen content,nitrogen content,Al loss and nonmetallic inclusions in the steel in the open casting part were higher than those in other parts,which implied that the secondary oxidation in the open casting part was more serious.In addition,the nearlier to open casting part the quantity and distribution density of inclusions with length more than 5μm.It is indicated that the effect of secondary oxidation on inclusions more then 5μm is obviously when open casting.

关 键 词：4130X 钢管分层 非金属夹杂物 二次氧化 

分 类 号：TG115[金属学及工艺—物理冶金]