摘要
利用Gleeble-1500热模拟实验机测试了SCM435钢连铸坯的高温塑性,并通过金相、扫描电镜等方法对拉断后试样的断口及组织形貌进行了观察分析。结果表明:SCM435钢在1 000～1 260℃时,其断面收缩率大于60%,具有良好的塑性。材料存在两个脆性温度区域,收缩率均小于60%脆性温度范围为1 260℃至熔点区间和750～1 000℃区间,从而在制定连铸和热轧工艺制度时可避开该温度区,或尽量在该区域少停留。
High temperature ductility of grade SCM435 continuous cast slabs is investigated through high temperature tensile test on GLEEBLE-1500 hot simulator and observation of the fracture and microstructure of the tensile sample made by optical microscope and scanning electron microscope. Results indicate that the section shrinkage rate of steel grade SCM435 at 1 000 to 1 200 ℃ is more than 60% and its ductility is excellent. In the material exist two brittle temperature zones with shrinkage rate less than 60% and their brittle temperature ranges are approximately controlled within the tm （melting points）-1 260 ℃ and 750-1000 ℃respectively. Therefore it＇s imperative to avoid those zones or stay in the zones as less as possible in drawing up the continuous casting and hot rolling schedules.
出处
《炼钢》
CAS
北大核心
2010年第4期50-54,共5页
Steelmaking
关键词
SCM435
连铸坯
高温热塑性
拉伸试验
grade SCM435
continuous cast slabs
high temperature ductility
tensile test
