X46MS耐酸管线钢混晶组织原因分析及控制措施  

Cause analysis and control measures of mixed crystal in X46MS acid resistant pipeline steel

作　　者：余志军 李显 周明科 唐文洋 YU Zhijun;LI Xian;ZHOU Mingke;TNAG Wenyang(Guangxi Iron and Steel Group Co.,Ltd.,Fangchenggang 538002,China;Guangxi Liuzhou Iron and Steel Group Co.,Ltd.,Liuzhou 545002,China)

机构地区：[1]广西钢铁集团有限公司,广西防城港538002 [2]广西柳州钢铁集团有限公司,广西柳州545002

出　　处：《轧钢》2025年第1期152-155,共4页Steel Rolling

基　　金：广西科技重大专项项目(AA22068081)。

摘　　要：针对X46MS耐酸管线钢产生混晶组织的问题,对其显微组织、生产工艺进行了分析,结合其化学成分设计及轧线实际控制情况,研究了混晶组织的产生原因,并提出了控制措施。结果表明:X46MS耐酸管线钢再结晶温度较低,而精轧入口温度较高时钢卷在精轧前机架处于部分再结晶区轧制是导致其产生混晶组织的主要原因。通过采取针对性措施,包括加热工序适当降低板坯加热温度、缩短加热时间,以降低整体工艺温度、减少原始奥氏体晶粒长大;粗轧工序优化除鳞喷水模式及温度控制,确保粗轧末道次温度命中率,并缩短中间坯待温时间;精轧工序将精轧空过机架及压下量后移,有效消除了X46MS耐酸管线钢混晶组织现象。In response to the problem of mixed crystal structure in X46MS acid resistant pipeline steel,the microstructure and production process were analyzed.Combined with its chemical composition design and actual control of the rolling line,the causes of mixed crystal structure were studied,and control measures were proposed.The results indicate that the recrystallization temperature of X46MS acid resistant pipeline steel is relatively low,while the main reason for its mixed crystal structure is that the steel coil is rolled in the partial recrystallization zone in the front stand of the finishing mill when the inlet temperature of the finishing mill is high.By taking targeted measures,including appropriately reducing the heating temperature and shortening the heating time of the slab during the heating process,the overall process temperature can be lowered and the growth of original austenite grains can be reduced.Optimize the descaling water spray mode and temperature control in the roughing rolling process to ensure the temperature hit rate of the final pass of roughing rolling and shorten the waiting time of the intermediate billet.The finishing rolling process involves bypass the stand and shifting the reduction to later stand,effectively eliminating the phenomenon of mixed crystal structure in X46MS acid resistant pipeline steel.

关 键 词：X46MS耐酸管线钢 混晶组织 粗轧末道次温度 精轧入口温度 部分再结晶区 生产工艺 改进措施 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TE973[金属学及工艺—金属材料]