X70管线钢在管件制造过程中晶粒长大规律研究  

Study on Grain Growth Behavior in Fitting-manufacture Process of X70 Pipeline Steel

作　　者：霍春勇[1] 刘迎来[1] 虞毅[2] 高惠临[2] 

机构地区：[1]中国石油管材研究所,陕西西安710065 [2]西安石油大学材料科学与工程学院,陕西西安710065

出　　处：《热加工工艺》2006年第22期56-57,74,共3页Hot Working Technology

基　　金：国家自然科学基金资助项目(50374056);中国石油创新基金资助项目(2002F70127ZYT-0208)

摘　　要：研究了X70级管线钢在不同加热温度和不同保温时间下的奥氏体晶粒长大规律。结果表明,当奥氏体化温度低于950℃时,试验钢有较小的晶粒尺寸;奥氏体化温度超过1 100℃,晶粒平均截距开始明显增大,一旦奥氏体化温度上升到1 300℃时,奥氏体晶粒已显著粗化。分析表明,试验钢奥氏体晶粒平均截距D!和奥氏体化温度T成指数关系。当奥氏体化温度为950℃和1 100℃时,奥氏体晶粒平均截距D!和保温时间t均成正比关系。研究结果对于X70级管线钢弯管和三通等管件制造的热加工过程有着重要参考价值。The grain growth behavior of a X70 grade pipeline steel in fitting-manufacture thermal process was studied. The results show that when heating temperature is lower than 950℃, the experimental steel has a smaller grain dimension;when heating temperature is above 1100℃ ,the anstenite grains grow rapidly. When heating within the range from 900-1300℃, the relationship between the average anstenitc grain size and heating temperature is exponential function;and when the experimental steel is heated at 950℃ and 1100℃ ,the relationship between the average austenite grain size and heating time is direct proportion. The results are important for the fitting-manufacture process of X70 grade pipeline steel at high temperature.

关 键 词：管线钢 管件 高温加工 奥氏体晶粒 

分 类 号：TG113.1[金属学及工艺—物理冶金]