摘要
采用金相显微镜、冲击试验机、扫描电子显微镜及能谱仪等检验、分析设备对10 mm厚700 MPa级高频电阻焊接方矩管焊缝冲击韧性偏低的原因进行分析。结果表明,焊缝处存在硅酸盐、氮化钛等内生夹杂物和以氧化锰为主的外来夹杂物,两者共同作用导致焊缝室温冲击吸收功小于8 J;后续采取加强炼钢工艺控制水平及增加高频电阻焊接顶锻力等措施,提高方矩管焊缝质量,焊缝冲击吸收功提高到20 J左右。在矫直定径工序,方矩管的开裂率从8%降低至3%。
The causes on lower impact toughness of weld for 10 mm thick 700 MPa grade square and rectangular welded pipe welded with high frequency resistance are analyzed with such inspection and analytical equipment as metallographic microscope,impact testing machine,scanning electron microscope and energy dispersive spectrometer.The results showed that there were such endogenous inclusions as silicate and titanium nitride as well as foreign inclusion that is mainly manganese oxide at the weld,the combined effect of which causes impact absorbing energy at room temperature of weld to be less than 8 J.Subsequently,the weld quality of square and rectangular welded pipe is improved,impact absorbing energy of weld is increased to about 20 J by taking such measures as strengthening control level of steelmaking process and increasing upset force of high frequency resistance welding.In straightening and sizing process,cracking rate of square and rectangular welded pipe is decreased from 8%to 3%.
作者
贾瑞雪
姚熠莹
秦蕊
刘恩泽
勤牧
陈建华
Jia Ruixue;Yao Yiying;Qin Rui;Liu Enze;Qin Mu;Chen Jianhua(Technical Center of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China)
出处
《包钢科技》
2025年第4期40-44,共5页
Science & Technology of Baotou Steel
关键词
700
MPa级高频电阻焊接方矩管
冲击韧性
断口形貌
显微组织
夹杂物
700 MPa grade square and rectangular welded pipe welded with high frequency resistance
impact toughness
fracture morphology
microstructure
inclusions
作者简介
贾瑞雪(1987-),女,内蒙古包头市人,工程师,现从事板材应用技术研究工作。
