热轧参数对大口径厚壁316LN不锈钢管组织和性能的影响研究  

Effect of Hot Rolling Parameters on Microstructures and Properties of 316LN Stainless Steel Pipes with Large Diameter and Thick Wall

作　　者：罗毅军[1] 陈海涛[2] 何昌明 

机构地区：[1]中国核动力研究设计院核反应堆系统设计技术重点实验室,四川成都610041 [2]钢铁研究总院特殊钢研究所,北京100081 [3]四川三洲川化机核能设备制造有限公司技术工艺部,四川成都610300

出　　处：《热加工工艺》2016年第9期48-51,共4页Hot Working Technology

摘　　要：使用皮尔格管材轧机在不同轧制变形量和轧制温度下热轧生产了大口径厚壁316LN不锈钢管,采用光学显微镜观察了热轧态管材和固溶态管材的显微组织,采用万能试验机测定了固溶态管材的室温拉伸力学性能。结果表明:提高轧制变形量能促进热轧过程中动态再结晶的形核过程,细化动态再结晶晶粒;提高热轧温度能促进热轧过程中动态再结晶的长大过程,粗化动态再结晶晶粒;不完全动态再结晶的热轧管材在固溶热处理过程中会发生已再结晶晶粒的异常长大,产生混晶,降低力学性能;提高轧制变形量和降低轧制温度可以细化固溶态管材的晶粒尺寸,提高力学性能。The 316 LN stainless steel pipes with large diameter and thick wall were produced by Pelger pipe mill at different rolling deformation and rolling temperature. The microstructures of the hot-rolled pipes and the solution state pipes were observed by using the optical microscope. The tensile mechanical properties of the solution state pipes at room temperature were tested by using the universal testing machine. The results show that, increasing the rolling deformation can promote the nucleation process of dynamic recrystallization and refine the grains; increasing the hot rolling temperature can promote the growth process of dynamic recrystallization and coarse grains; hot rolled tube of incomplete dynamic recrystallization can produce the abnormal growth of the recrystallized grains and mixed crystal during the solution heat treatment, and mechanical properties are reduced; increasing the rolling deformation and reducing the rolling temperature can refine the grain size of the solution state pipes and improve the mechanical properties.

关 键 词：大口径厚壁管 316LN不锈钢管 热轧 再结晶 力学性能 

分 类 号：TG335.7[金属学及工艺—金属压力加工]