X100管线钢焊接冷裂纹敏感性研究  

Study on welding cold cracking sensitivity of X100 pipeline steel

作　　者：徐学利[1] 张福平[1] 黄景鹏[1] 

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065

出　　处：《焊接技术》2016年第8期25-28,5,共4页Welding Technology

基　　金：国家科技支撑计划(2011BAE35B01);西安石油大学<材料科学与工程>省级优势学科专项资金资助项目(ys37020203)

摘　　要：采用插销试验方法和焊接HAZ最高硬度试验方法,研究了X100管线钢焊接HAZ的冷裂纹敏感性。结果表明,X100管线钢在不预热条件下,临界断裂应力σcr为740 MPa,大于0.75Rt 0.5(Rt 0.5为763 MPa);最高硬度为HV10281.2,低于临界硬度HV10350,整个断口为韧窝-部分解理组成的混合断口,即抗冷裂纹性好,对冷裂纹不敏感;当其他条件不变,对X100管线钢进行50℃预热,其临界断裂应力σcr为800 MPa,与不预热相比较,抗冷裂纹性能得到提高,通过预热可以提高冷裂纹的敏感性。The cold cracking sensitivity of X100 pipeline steel HAZ were studied by using implant test and the highest hardness of HAZ. The result indicated that in the case of no preheating, the critical fracture stress σcrwas 740 MPa, which was greater than the yield strength Rt0.5( 763 MPa), the maximum hardness value was HV10281.2,which was lower than the critical hardness value of HV10350. The fracture characteristics was mixed fracture including toughening test and part of the cleavage, X100 pipeline steel was insensitive to cold cracking. When put preheating50 ℃, the critical fracture stress σcrwas 800 MPa, comparing with no preheating, the cold crack resistance had enhanced. By put preheating, it could improve the sensitivity of cold cracking.

关 键 词：X100管线钢 插销试验 热影响区 最高硬度 冷裂纹敏感性 

分 类 号：TG406[金属学及工艺—焊接] TG457.11