Thermal simulation of single thermal cycle for high strength steel pipe  

作　　者：Xia Peipei Yang Liuqing Wu Linen Gu Yunlong Xu Xiaolin You Zongbin 夏培培;杨柳青;吴林恩;谷云龙;徐晓林;由宗彬(China Petroleum Pipeline Engineering Co.Ltd.,Langfang 065000,China;North China Institute of Aerospace Engineering,Langfang 065000,China)

机构地区：[1]China Petroleum Pipeline Engineering Co.Ltd.,Langfang 065000,China [2]North China Institute of Aerospace Engineering,Langfang 065000,China

出　　处：《China Welding》2022年第4期59-66,共8页中国焊接（英文版）

基　　金：supported by Science and Technology Research Project of Universities of Hebei Province(No.QN201.221)。

摘　　要：Single thermal cycle simulation tests were carried out for X80 high strength steel pipes from three steel mills by a Gleeble 3500HS thermal simulation test machine,and coincidence degree of the thermal simulation curve with the set curve under heat inputs of 6–30 kJ/cm was observed;The relationship between different heat inputs and microstructure,impact toughness and hardness of steel pipe CGHAZ(coarse grain heat affected zone)was studied by metallographic examination,impact test and hardness test.The results show that with the increase of heat input,original austenite grain size increases gradually,the lath bainite ratio decreases and the granular bainite ratio increases.The impact toughness of C steel pipe is lower than those of A and B steel pipe,and the impact toughness of CGHAZ from the three steel pipes show different trends:for A steel pipe CGHAZ,impact toughness increases first and then decreases,with the highest value of 270–320 J under 20–25 kJ/cm;for B steel pipe CGHAZ,impact toughness decreases slightly;for C steel pipe CGHAZ,impact toughness increases,with the highest value of 260–300 J under 25 kJ/cm.As the heat input increases,the hardness of three X80 steel pipes CGHAZ shows a decreasing trhighend,and C steel pipe has the largest decreasing range.

关 键 词：X80 pipe single thermal cycle coarse grain heat affected zone heat input 

分 类 号：TE973[石油与天然气工程—石油机械设备] TG142.1[一般工业技术—材料科学与工程]