管線鋼化學成分及組織對HFW鋼管焊縫性能的影響

Influence by Chemical Composition and Structure of Pipe Line-purposed Steel on Weld Property of HFW Pipe

摘要: 分析了卷板化學成分及組織對HFW鋼管焊縫性能的影響機理，并提出了控制方法。分析認為：熱軋卷板中C、P、S的含量和晶粒度對HFW鋼管焊縫的低溫沖擊性能影響較大；夾雜物、帶狀組織也對HFW焊管焊縫沖擊韌性有較大影響；微合金化元素Nb、V、Ti在焊接及中頻熱處理中有抑制奧氏體晶粒長大的作用。

Abstract: Analyzed is the mechanism of effects by the chemical composition and microstructure of the steel strip on the weld property of the HFW pipe. Accordingly，countermeasures are proposed. The analysis result reveals the following facts. The contents of C，P and S，and the grain size of the hot-rolled steel strip have obvious influence on the low temperature impact property；the inclusions and the banded structure of the steel also produce significant effect on the impact toughness of the pipe； and the micro-alloy elements like Nb，V and Ti jointly play a role in restraining growth of austenitic grains during welding and MF heat treatment processes.