X80管线钢屈服强度偏低原因探索  

Discussion on the Reason Caused Low Yield Strength of X80 Pipeline Steel

作　　者：贾改风[1] 李钧正[1] 刘守显[1] 王文录[1] 

机构地区：[1]河北钢铁集团邯钢公司,河北邯郸056015

出　　处：《焊管》2013年第5期34-37,共4页Welded Pipe and Tube

摘　　要：利用Minitab统计软件,对邯钢公司X80管线钢生产初期出现屈服强度偏低的问题进行了系统分析,主要从冶炼成分、轧制工艺、金相组织等方面进行了研究。结果表明,熔炼成分中的主要强化元素C,Mn,Nb,Mo和轧制过程中的终轧、卷取温度等关键控制点过程控制能力均较高,未出现异常,主要制约点在于热轧工序层流冷却水温偏高导致冷却速度降低,致使金相组织异常,出现较多的准多边形及多边形铁素体,马奥岛分布不一,颗粒大小不均,从而造成屈服强度偏低。In this article, it conducted system analysis on low yield strength occurred in initial production stage of X80 pipeline steel, by adopting Minitab statistical software, and carried out study from smelting compostition, steel rolling technology, metallographic structure and so on. The result showed that the process control ability of some key control points are high and don＇t appear abnormal, such as the the main strengthening elements C, Mn, Nb, Mo in melting components and the temperature of finish rolling and coiling. The main control point is that the high temperature of laminar flow cooling water lead to cooling rate decreasing, which directly result in abnormal metallographic structure, more quasi-polygonal ferrite and polygonal ierrite, uneven distribution of martensite and austenite islands, and nommiform grain, finally, it generate low yield strength.

关 键 词：X80管线钢 Minitab统计软件 屈服强度 

分 类 号：TG142[一般工业技术—材料科学与工程]