连续退火快冷出口温度对SPCC冷轧薄板组织和性能的影响  

Effect of continuous annealing fast cooling outlet temprature on the microstructures and properties of SPCC cold rolled sheet

作　　者：周博文 蒋才灵 樊雷 刘义虎 陆茂森 杨跃标 Zhou Bowen;Jiang Cailing;Fan Lei;Liu Yihu;Lu Maosen;Yang Yuebiao(Guangxi Liuzhou Iron&Steel Group Co.Ltd.,Liuzhou 545000,Guangxi,China;Guangxi Iron&Steel Group Co.Ltd.,Fangchenggang 538000,Guangxi,China)

机构地区：[1]广西柳州钢铁集团有限公司,广西柳州545000 [2]广西钢铁集团有限公司,广西防城港538000

出　　处：《钢铁钒钛》2024年第4期176-180,共5页Iron Steel Vanadium Titanium

基　　金：柳州市科技重大专项《高品质冷轧热镀锌钢板开发及关键生产技术研究》(2019AC10603)。

摘　　要：研究了快冷出口温度对连续退火SPCC冷轧薄板组织和性能的影响。结果表明:连续退火SPCC产品的主要组织为等轴铁素体晶粒、晶界处块状碳化物及晶粒内部粒状碳化物,快冷出口温度主要影响着钢中碳化物的析出及分布。随着快冷出口温度的降低,晶界处碳化物数量减少,晶粒内碳化物数量增多,钢卷出现屈服平台的几率显著下降,屈服强度也明显降低。当快冷出口温度从500℃降低至430℃时,屈服平台比例从55%降低至10%,平均屈服强度降低了22 MPa。Effect of continuous annealing fast cooling outlet temprature on the microstructures and properties of SPCC cold rolled sheet was studied.The results show that there are equiaxed ferrite grains,massive carbides on grain boundaries and granular carbides in grains in the continuous annealed SPCC cold rolled sheet.The fast cooling outlet temprature mainly affects the precipitation and distribution of carbides in steels.With a drop of the fast cooling outlet temprature,the number of carbides on the grain boundaries decreases,and the number of carbides in grains increases.The existing proportion of yield platform in the testing coils decreases,and the yield strength also decreases obviously with the decrease of outlet temperatures.When the fast cooling outlet temprature decreases from 500℃to 430℃,the existing proportion of yield platform decreases from 55%to 10%,and the average yield strength decreases by about 22 MPa.

关 键 词：SPCC冷轧薄板 连续退火 快冷出口温度 显微组织 力学性能 

分 类 号：TF76[冶金工程—钢铁冶金] TG156.24[金属学及工艺—热处理]