120t转炉-LF-VD-CC流程生产GCr15轴承钢的夹杂物  

Inclusions in GCr15 bearing steel produced by 120 t LD-LF-VD-CC process

作　　者：范植金[1] 罗国华[1] 冯文圣[2] 朱玉秀[1] 

机构地区：[1]武汉钢铁(集团)公司研究院,湖北武汉430080 [2]武汉钢铁(集团)公司条材总厂,湖北武汉430083

出　　处：《金属热处理》2011年第11期37-41,共5页Heat Treatment of Metals

摘　　要：对120 t转炉-LF-VD-CC流程生产的GCr15轴承钢夹杂物进行了金相显微镜观察评级、电子探针观察分析和电解夹杂分析。结果显示:A类夹杂0.5～1.5级,B类夹杂0.5～1.5级,C类夹杂0级,D类夹杂不大于0.5级,可充分满足GB/T 18254—2002标准的规定;其氧化夹杂物总质量分数平均值为0.00370%,相比采用Al脱氧电炉冶炼的GCr15轴承钢明显降低;夹杂物类型主要有条状硫化锰、链状氧化铝、纺锤状硫化锰包覆粒状氧化铝、粒状铝酸钙、粒状硫化钙包覆铝酸钙、粒状镁铝尖晶石、粒状硫化钙包覆镁铝尖晶石、方块状氮(碳)化钛等。Inclusions in GCr15 bearing steel produced by 120 t LD-LF-VD-CC process were investigated using metallogaphic microscope analysis,electron probe microanalysis and inclusion electroanalysis.The results indicate that the A inclusion grade is 0.5-1.5,B inclusion grade is 0.5-1.5,C inclusion grade is 0,D inclusion grade is not more than 0.5.The results of inclusion grading satisfy requirements of the GB/T 18254—2002 standard.Average total amount of oxide inclusions in GCr15 bearing steel produced by LD-LF-VD-CC process is 0.0037% in mass percent,which is reduced in evidence compared with Al-killed GCr15 steel produced by electric furnace.The inclusions mainly are strip manganese sulfide,chain alumina,fusiform manganese sulfide enwrapping granular alumina,granular calcium aluminate,granular calcium sulfide enwrapping calcium aluminate,granular magnesium aluminum spinel,granular calcium sulfide enwrapping magnesium aluminum spinel,quadrate titanium（carbide）nitride,etc.

关 键 词：LD转炉 GCR15钢 铝酸钙 镁铝尖晶石 氮(碳)化钛 

分 类 号：TG142.1[一般工业技术—材料科学与工程]