薄规格正火管线容器板冲击韧性分析与控制  

Impact Toughness Analysis and Control of Thin-gauge Normalizing Container Plates

作　　者：雷钧皓 李媛媛 LEI Junhao;LI Yuanyuan(Jiangsu Shagang Group Co.,Ltd.,Jiangsu 462500,Zhangjiagang,China)

机构地区：[1]江苏沙钢钢铁有限公司,江苏张家港462500

出　　处：《热处理技术与装备》2024年第6期26-30,34,共6页Heat Treatment Technology and Equipment

摘　　要：随着科技的发展,终端用户对压力容器用板(16MnDR、Q245R、L245NS、SA516Gr60/65/70、09MnNiDR等)的性能要求越来越苛刻,在要求冲击韧性的同时增加了对剪切断面率的要求,使得低温冲击韧性指标不断提高。薄规格板材受生产线设备参数、规格等因素影响,存在成分偏析、带状组织、轧制压缩比小及在轧制成形的同时无法实现有效控轧控冷等问题,导致薄规格钢板正火后的冲击韧性指标偏低。通过优化轧制工艺减少甚至消除部分带状组织,使轧态基体组织均匀和细化;在正火后加速冷却,得到以铁素体和珠光体为主并具有一定含量的过冷贝氏体、马氏体的组织;针对性改善薄规格正火容器板的组织形貌、均匀细化组织,可以提高其冲击韧性。With the development of science and technology,the end user's performance requirements for pressure vessel plates(16MnDR,Q245R,L245NS,SA516Gr60/65/70,09MnNiDR,etc.)are becoming more and more demanding.While requiring impact toughness,the requirements for shear section rate are increased,which makes the low-temperature impact toughness index continue to improve.The impact toughness index of thin-gauge steel plate after normalizing is low due to the factors such as component segregation,strip structure,small rolling compression ratio and the inability to effectively control rolling and cooling while rolling.By optimizing the rolling process,the strip structure is reduced or even eliminated,and the rolled matrix structure is uniform and refined.After normalizing,accelerated cooling results show that the structure is mainly composed of ferrite and pearlite with certain content of subcooled bainite and martensite.The impact toughness of thin-gauge normalizing container plate can be improved by improving the structure morphology and thinning the structure uniformly.

关 键 词：薄规格 正火容器板 加速冷却 冲击韧性 

分 类 号：TG156[金属学及工艺—热处理]