摘要
针对中国铁路客车和货车轴箱轴承用钢主要使用电渣钢的现状,采用铁水+废钢→70 t电弧炉→LF→RH→3 t钢锭→均热坑→1350+750/650轧机轧制的流程生产规格ϕ60~ϕ120 mm 8620钢(质量分数/%:0.18~0.22 C,0.15~0.30 Si,0.75~0.95 Mn,0.45~0.65 Cr,0.45~0.70 Ni,0.15~0.25 Mo,≤0.020 P,≤0.015 S,0.020~0.050 Al)。通过控制出钢留钢留渣、炉后造渣和合金化,真空处理时间≥25 min,氩气弱搅拌,控制钢水过热度,全过程Ar气保护,模铸自动浇注,轧制后控制冷却等工艺措施,生产的产品宏观夹杂物检测含量≤10 mm/dm3,晶粒度8~8.5级,密度达到7.854 g/cm^(3),钢材各项指标满足标准要求。
Based on the current quality situation of ESR bearing steel for passenger railway and wagons in China,the grade 8620 steel bars with diameters between 60 mm and 120 mm are produced with the process as follows:70 t EAF(Hot Metal+Scrap)→LF→RH→3 t steel ingot→soaking pit→1350+750/650 rolling mill,whose chemical composition are(%):0.18-0.22 C,0.15-0.30 Si,0.75-0.95 Mn,0.45-0.65 Cr,0.45-0.70 Ni,0.15-0.25 Mo,≤0.020 P,≤0.015 S,0.020-0.050 Al.By taking technological measures such as steel and slag retention operation,slag formation and alloy addition during tapping,vacuum holding time≥25 min and soft argon blowing,superheat control,full process Argon protection casting and automatic pouring as well as controlling cooling after rolling etc,to keep 8620 steel bars conform to all technical specification requirements,especially,macro-inclusions of finished bars less than 10 mm/dm^(3),grain size class 8-8.5,and the density being 7.854 g/cm^(3).
作者
李博鹏
陶士君
张剑锋
刘月云
陆竹君
吕文俊
Li Bopeng;Tao Shijun;Zhang Jianfeng;Liu Yueyun;Lu Zhujun;Lv Wenjun(Daye Special Steel Co.,Ltd.,Huangshi 435001,China;Hubei Provincial key laboratory of high-quality special steel,Huangshi 435001,China)
出处
《特殊钢》
2024年第3期1-4,共4页
Special Steel
关键词
3
t钢锭
8620钢
模铸自动浇注
宏观夹杂物
密度
3 t Steel Ingot
Grade 8620 Steel
Automatic Ingot Casting,Macro-inclusion
Density
作者简介
李博鹏(1981—),男,本科,高级工程师,E-mail:liboepng@citicsteel.com。
