管线钢管韧脆转变温度影响因素分析

Analysis on the Influence Factors of Ductile-brittle Transition Temperature for Line pipe

研究了不同温度下螺旋埋弧焊管母材横向取样和纵向取样落锤撕裂试验(DWTT)韧脆转变温度(FATT)的变化情况,分析了材料晶粒度、化学成分、应变速度、显微组织和缺陷等因素对韧脆转变温度的影响。结果表明:细化晶粒,提高管线钢的纯净度,控制DWTT锤击速度,控制管线钢中各种组织成分的比例,减少材料内部尖锐缺陷等均有利于提高管线钢的韧性。

This article studied the changing situation of DWTT fracture appearance transition temperature under the horizontal and vertical of sample direction in the SAWH pipe body. It analyzed the influence factors on fracture appearance transition temperature from several aspects, such as grain size of material, chemical composition,strain rate, microstructure and defects. The results showed that refining grain, increasing pipeline steel purity, control peening rate of DWTT, control proportion of each construction in pipeline steel, and decreasing sharp defects in material can be favorite to increase pipeline steel toughness.