MnS形态和轧制参数对高硫易切削不锈钢430F成材率的影响  

Effect of MnS Morphology and Rolling Parameters on Yield of high Sulfur Free Cutting Stainless Steel 430F

作　　者：吴翔宇 王高峰 李杰 王建强[3] 沈平 付建勋 Wu Xiangyu;Wang Gaofeng;Li Jie;Wang Jianqiang;Shen Ping;Fu Jianxun(Center for Advanced Solidification Technology,School of Materials Science and Engineering,Shanghai University,Shanghai 200444;State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444;Pangang Group Sichuan Great Wall Special Steel Co Ltd,Jiangyou 621000)

机构地区：[1]上海大学材料科学与工程学院先进凝固技术中心,上海200444 [2]上海大学高品质特殊钢国家重点实验室,上海200444 [3]攀钢集团四川长城特殊钢有限责任公司,江油621000

出　　处：《特殊钢》2021年第4期20-24,共5页Special Steel

基　　金：国家自然科学基金资助项目(51874195,51671124)。

摘　　要：采用了扫描电镜、超高温激光共聚焦显微镜、Gleeble-3500等试验设备结合专业图像处理软件分析了430F钢轧材的开裂原因,各元素的改质效果及机理以及高温力学性能。结果表明,430F钢中MnS形态控制较差,长条状MnS所引起的细小裂纹是造成轧材开裂的主要原因;镁改质形成的细小MnS·Al_(2)O_(3)·MgO以及碲改质形成的粗大MnS·(Te)都使MnS的形貌得到了明显改善,未发现轧材裂纹;430F钢材的断面收缩率在高温段变化较为明显,而抗拉强度在低温段的变化较为显著,因此,将未改质钢开轧温度由1180℃提高至1200~1210℃,终轧温度由1000℃降低至970~980℃,成材率由85%提高至95%。The cracking formation factors of steel 430 F rolled bar are analyzed by scanning electron microscope,ultrahigh temperature laser confocal microscope,Gleeble-3500 and other experimental equipment combined with professional image processing software,the modification effect and mechanism of each element and the high temperature mechanical properties.The results show that the control of MnS morphology in 430 F steel is poor,and the tiny crack caused by long strip MnS is the main reason for cracking.Fine MnS·Al_(2)0_(3)·MgO is formed by magnesium modification and coarse MnS·(Te) is formed by tellurium modification to obviously improve the morphology of MnS,no cracks were found in the rolled products.The reduction of area of steel 430 F changes obviously at high temperature,while the tensile strength changes significantly at low temperature,therefore,with increasing the starting rolling temperature of unmodified steel from 1 180℃ to 1 200 ~1 210℃ and reducing the final rolling temperature from 1 000 ℃ to 970 ~980 ℃,the yield of products can increases from 85% to 95%.

关 键 词：430F高硫易切削不锈钢 MnS改质 轧制参数 成材率 

分 类 号：TG335[金属学及工艺—金属压力加工]