化学成分与冷却速度对Q345E钢低温冲击性能的影响  

Effect of chemical composition and cooling rate on low temperature impact property of Q345E steel

作　　者：袁敏[1] 包石磊[1] 张洪才[1] 孙大文[1] 

机构地区：[1]江苏沙钢集团淮钢特钢股份有限公司,江苏淮安223002

出　　处：《金属热处理》2014年第1期34-37,共4页Heat Treatment of Metals

摘　　要：采用低C、P、Si含量和V微合金化的成分设计方案，通过控制再结晶连续轧制和加速轧后冷却的工艺成功开发直径达250mm的Q345E低温用钢。试验结果表明，随着冷却速度增大，铁素体晶粒更加均匀细化，低温冲击性能提高。采用风机强制冷却，晶粒度在7—8级，低温冲击性能满足标准要求。同时发现，材料存在明显的尺寸效应，由表及里晶粒逐渐变得粗大，低温冲击吸收能量降低。Based on chemical composition design of low content of carbon, phosphorus, silicon and vanadium micro-alloying, the Q345E steel for low temperature with diameter up to 250 mm was successfully developed by recrystallization rolling, accelerated cooling after rolling and spontaneous tempering process. The results show that with the increasing of cooling rate, the ferrite grain is more uniform and fined which is effective to improve low temperature impact property. The grain size is 7-8 grade and the low temperature impact property meets the standard requirement very well by using wind intensive cooling. The size effect of grain coarsing from surface to centre lead to low temperature impact value decreasing is found.

关 键 词：低温冲击性能 风冷 冷却速度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]