摘要
Abstract
In order to improve the quality of trial-manufactured X90 line pipe for localization,taking X90 SAWH pipe as research object,the problems existed in X90 line pipe localization trial-manufacture were summarized from steel pipe chemical composition,metallographic structure,mechanical properties,and the quality control key points were analyzed.The problems existing in localization trial-manufacture indicated that high content P caused unqualified impact performance;in actual production,the coiling temperature is higher,the middle laminar flow cooling rate is slow,and no lath bainite area appear in final obtained structure,it is the main reason for the lower strength and toughness.The analysis results considered that strengthening control of P,Mn,CEpcm,Nb +V +Ti,adjusting and optimizing rolling process of pipeline steel can effectively improve the whole quality of X90 line pipe.关键词
焊管/X90管线钢/化学成分/热处理参数Key words
welded pipe/X90 pipeline steel/chemical composition/heat treatment parameters分类
能源科技
