国内外630不锈钢非金属夹杂物对比分析  

Comparison and analysis of non-metallic inclusions in 630 stainless steel at home and abroad

作　　者：管彦超 韩正鹏 徐翔宇 付建勋 GUAN Yanchao;HAN Zhengpeng;XU Xiangyu;FU Jianxun(Center for Advanced Solidification Technology,School of Materials Science and Engineering,Shanghai University,State Key Laboratory of Advanced Special Steel,Shanghai 200444,China)

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,省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444

出　　处：《冶金分析》2025年第2期1-9,共9页Metallurgical Analysis

基　　金：上海大学与浙江青山钢铁公司校企合作项目(D.71-0110-22-080)。

摘　　要：SUS630不锈钢(以下简称630不锈钢)因其卓越的力学性能和耐腐蚀性,在尖端行业中表现突出,客户对其纯净度有极高的标准。本文研究了3种工艺(连铸、模铸、电渣)下生产的5种630不锈钢产品的洁净情况。利用光学显微镜(OM)、扫描电子显微镜/能谱仪(SEM/EDS)和电子探针显微分析(EPMA)对夹杂物的类型、分布、三维形貌及显微组织进行比较。结果显示,电渣工艺下的国内A样最为洁净,夹杂物密度为18个/mm^(2),面积占比为0.009%;连铸工艺下的国内B样夹杂物密度最高,且含有大尺寸硫化物夹杂。相同模铸工艺的日本样品夹杂物分布均匀,而国内C样则存在大量Nb(N,C)偏析,存在点蚀风险。本文填补了630不锈钢夹杂物研究的空缺,为未来高品级630不锈钢的改良开发提供数据支持。630 stainless steel(hereinafter referred to as SUS630)stands out in cutting-edge industries due to its exceptional mechanical properties and corrosion resistance.The customers require very high standards on its purity.In this paper,the cleanliness of five SUS630 products from three processes(continuous casting,mold casting,and electroslag remelting)was investigated.The types,distribution,three-dimensional morphology,and microstructure of inclusions were compared using optical microscopy(OM),scanning electron microscopy with energy-dispersive spectroscopy(SEM-EDS),and electron probe microanalysis(EPMA).The results showed that the domestic A sample produced by the electroslag process was the cleanest,with an inclusion density of 18 inclusions/mm^(2) and an area fraction of 0.009%.The domestic B sample from the continuous casting process had the highest inclusion density and contained large-sized sulfide inclusions.The Japanese sample produced by the same mold casting process exhibited a uniform distribution of inclusions,while the domestic C sample showed significant Nb(N,C)segregation,posing a risk of pitting corrosion.This study filled a gap in the research on inclusions in SUS630 and provided data support for the future development of high-grade SUS630.

关 键 词：630不锈钢 夹杂物 洁净度 碳氮化铌 硫化物 凝固 

分 类 号：TF764.1[冶金工程—钢铁冶金] TF701.3[金属学及工艺—物理冶金] TG115.21[金属学及工艺—金属学]