薄板坯热连轧工艺对65Mn钢带组织和性能的影响  

Effect of FTSR Hot Rolling Process on Microstructure and Mechanical Properties of 65Mn Strip

作　　者：李秀景[1] 王淑华[1] 张星[1] 李宏伟[1] Li Xiujing;Wang Shuhua;Zhang Xing;Li Hongwei(Tangshan Iron and Steel Group Co.Ltd,Tangshan 063016,Hebei,China)

机构地区：[1]唐山钢铁集团有限责任公司,河北唐山063016

出　　处：《钢铁钒钛》2020年第6期158-163,共6页Iron Steel Vanadium Titanium

摘　　要：对不同热连轧卷取工艺生产的65Mn钢带进行了组织和性能对比及模拟淬火试验分析,结果表明:卷取温度由740℃降低至600℃,组织中铁素体含量逐渐降低并消失,珠光体尺寸及层片间距逐渐减小,钢带强度和硬度不断上升;钢带在850℃加热时相变奥氏体晶粒长大的阻力显著,再结晶奥氏体晶粒尺寸受原始珠光体尺寸直接影响;通过模拟淬火试验结果设定的工业生产工艺可满足钢带加工使用要求,淬火后钢带表面硬度(HRc)≥53。Microstructure and mechanical properties of FTSR 65 Mn steel strips produced by different hot coiling technologies was investigated,and simulated quenching heat-treatment were carried on. The result shows that ferrite reduces in term of its volume fraction and finically disappears with coiling temperature going down from 740 ℃ to 600 ℃,but the pearlite size and space decrease,and strength and hardness of resulted 65 Mn strip increase. When the strip is heated at 850 ℃,the coarsing of transformed austenite grain is retarded,and the size of grains is directly affected by primary pearlite. Industrial quenching process based on experiment is suitable for strip production of the required performance,and the hardness of strip surface after quenching is above 53 HRc.

关 键 词：薄板坯连铸连轧 65MN钢 奥氏体化 组织 力学性能 

分 类 号：TF76[冶金工程—钢铁冶金] TG142.1[一般工业技术—材料科学与工程]