Mn含量对13Cr不锈钢油管冷裂敏感性的影响  

Influence of Mn Content on Cold-crack Sensibility of 13Cr Stainless Steel Tubing

作　　者：范淑敏 陈丽 扈立 FAN Shumin;CHEN Li;HU Li(Tianjin Pipe Co.,Ltd.,Tianjin 300301,China)

机构地区：[1]天津钢管制造有限公司,天津300301

出　　处：《钢管》2025年第1期48-51,共4页Steel Pipe

摘　　要：针对不同Mn含量的13Cr不锈钢管材出现的不同冷裂倾向,通过测量Mn含量对管材纵向、径向、环向试样相变温度及相变体积效应的影响,结合管材相变过程应力分析,研究了Mn含量对13Cr不锈钢油管冷裂敏感性的影响,探索了轧后开裂的原因。结果表明,Mn含量增加将使马氏体转变开始温度M_(s)降低,同时相变体积效应增大,其中径向试样长度变化最为显著,这将导致管材轧后马氏体相变过程环向拉伸应变增加,最终造成管材外表面环向拉应力过大,增加管材开裂风险。Addressing the different cold-crack trends of the 13Cr stainless steel pipes with different Mn contents,the effect by Mn content on the cold-crack sensibility of the 13Cr stainless steel tubing is studied and the causes for after-rolling cracking of it are explored by means of separately measuring the influence of Mn content on phase transformation temperatures and volume effects of the longitudinal,radial and circumferential specimens of the pipe,and the stress analysis of the phase transformation process thereof.The results show that the martensitic transformation temperature(M_(s))falls down,while the volume effect grows up as the Mn content increases,among which,the radial specimen presents the most significant change in length which leads to the increase of the circumferential tensile strain of the as-rolled pipe during the martensitic transformation process,ultimately causing excessive circumferential tensile stress on the outer surface of the pipe,and thus resulting in increase of the cracking risk.

关 键 词：油管 13Cr不锈钢 MN含量 冷裂 马氏体相变 

分 类 号：TE931.2[石油与天然气工程—石油机械设备] TG142.71[一般工业技术—材料科学与工程]