X120钢级螺旋缝埋弧焊管研制结果及分析

X120钢级管线管是目前国际上研发的最高钢级的管线管。介绍了渤海装备公司华油钢管有限公司研制开发X120钢级螺旋缝埋弧焊管的结果。通过金相组织分析及各项试验表明,所研制钢管的性能满足APISpec5L标准(44版)的要求,安全性高,但屈服强度偏高,夏比冲击功偏低。针对存在的不足,提出了降低钢带屈服强度,提高卷曲温度,适当降低钢中B、Mo和Ni合金元素含量,以及降低钢的碳当量等建议。

R & D Achievement of X120 SAWH Pipe and Relevant Analysis

The X120 steel linepipe is regarded so far as the linepipe in the most premium steel grade in the world.Elaborated here in the article is the achievement from the R & D activities for the X120 SAWH pipe as performed by North China Petroleum Steel Pipe Co.,Ltd.Relevant metallographic structure analyses and tests demonstrate that the X120 SAWH pipe as developed is in conformity to the requirements as specified under API Spec 5L(the 44th edition),and features high safety level,nevertheless its yield strength is rather high,and its charpy impact value rather low.Addressing the existing shortcomings,corrective actions are proposed,including reducing the yield strength of the strip steel,increasing the coiling temperature,and properly cutting down the contents of the alloy elements B,Mo and Ni and the carbon equivalent in the steel,etc.