一种高强度低合金钢管分层分析  

Analysis for Lamination Defect of a Certain Type of Hi-strength Low Alloy Steel Pipe

作　　者：牛亮 周勇[1] 赵映辉[1] 周慧敏 NIU Liang;ZHOU Yong;ZHAO Yinghui;ZHOU Huimin(Hengyang Valin Steel Tube Co.,Ltd.,Hengyang 421001,China)

机构地区：[1]衡阳华菱钢管有限公司,湖南衡阳421001

出　　处：《钢管》2023年第6期21-25,共5页Steel Pipe

摘　　要：通过微观形貌和热力学分析,确定Φ374.65 mm×18.65 mm规格110S套管的分层缺陷产生原因为钢管内Al_(2)O_(3)-SiO_(2)-CaO复合夹杂物含量超标:反查工艺认为夹杂物含量超标是因为炼钢钢包软吹氩效果不佳及大包下渣造成的。通过保证钢包软吹氩效果、留钢操作、规范长水口插入制度及溢渣制度,优化中间包等系统性的钢中夹杂物控制技术,夹杂物合格率由91.34%提高至98%以上,改进后再未出现钢管分层缺陷。It is identified via relevant the micro-morphology and dynamic analyses that the lamination defect of the Φ374.65 mm×18.65 mm 110S casing is caused by the excessive content of the Al_(2)O_(3)-SiO_(2)-CaO complex inclusion.And it is further identified via the inversion check of the process that the said excessive inclusion content is caused by poor effect of the ladle soft argon blowing,and the ladle slag discharge.Accordingly the inclusion qualification rate is increased from 91.34%up to higher than 98%by means of actions aiming at systematically controlling the steel inclusion,including assuring proper ladle argon blowing effect,remaining steel operation,regulating the long nozzle inserting procedure and the slag overflowing procedure,and optimizing the tundish,etc.As a result the lamination defect of the steel pipe has never occurred.

关 键 词：低合金钢 钢管 分层缺陷 复合夹杂物 

分 类 号：TG142.1[一般工业技术—材料科学与工程]