X90管线管国产化质量分析

Quality Analysis of X90 Pipeline Localization

为了提高国产化试制的X90管线管的质量,以X90螺旋埋弧焊管为研究对象,从钢管的成分、组织、力学性能等方面,总结了X90管线管国产化试制中存在的问题,分析了管线管质量控制要点。国产化试制钢管存在的问题表明,P含量偏高是造成冲击性能不合格的主要原因;卷板生产时实际温度较高,中层流冷却速度较慢,组织中未出现板条贝氏体区,是造成X90管线管强度和韧性较低的主要原因。分析认为,加强对管线钢P、Mn、CEpcm、Nb+V+Ti等的控制,调整优化管线钢轧制工艺,能够有效改善X90管线管的整体质量。

In order to improve the quality of trial-manufactured X90 line pipe for localization, taking X90 SAWH pipe as research objecl, the problems existed in X90 line pipe localization trial-manufacture were sumniarized 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 perfommnce; 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 resuhs 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.