中碳J55钢HFW焊接油井管钩状裂纹缺陷分析  

Analysis of Hook Crack Defects on HFW Welding Tubing and Casing of Medium-carbon J55 Steel

作　　者：邹航[1] 徐进桥[1] 张峰[2,3] 郭斌[1] 孔君华[1] 崔磊[1] 李利巍[1] 

机构地区：[1]武汉钢铁(集团)公司研究院,武汉430080 [2]国家石油天然气管材工程技术研究中心,陕西宝鸡721008 [3]宝鸡石油钢管有限责任公司钢管研究院,陕西宝鸡721008

出　　处：《焊管》2015年第9期17-21,共5页Welded Pipe and Tube

基　　金：国家十二五科技支撑计划资助项目"高强度耐腐蚀油井管用钢生产技术"(项目号2011BAE25B04)

摘　　要：钩状裂纹缺陷是导致中碳J55钢超声波探伤不合格的主要原因。针对中碳J55钢HFW焊接过程中出现的不同钩状裂纹缺陷进行了分析,并提出了改进措施。研究结果表明,造成中碳J55钢HFW焊接钩状裂纹的主要原因为钢中的大颗粒夹杂物以及板厚1/4位置严重偏析,且现有的夹杂物及带状组织检验标准难以对J55钢的质量进行有效管控。通过减少单中包连浇炉次、增加铸坯头尾切废量以及改用直弧形连铸机等措施,钩状裂纹缺陷率可大幅降低。Hook crack is the fundamental reason for the rejection of ultrasonic detection. Different kinds of hook crack defects, which happened during HFW welding of medium-carbon J55 steel, were analyzed, and effective measures were given. The results showed that large inclusions and severe segregation at 1/4 thickness are mine reasons for hook crack defects, and the existing inclusion and banded structure test standards were proved ineffective. By reducing the number of casting furnace, increasing the cutting length of slab head and tail and using straight arc slab casting machine, hook crack defects could be greatly reduced.

关 键 词：焊管 J55钢 油套管 中碳钢 HFW 钩状裂纹 

分 类 号：TE973[石油与天然气工程—石油机械设备]