大功率风电主轴承用GCr15SiMn2轴承钢Φ800 mm锻材试制  

Development ofϕ800 mm Forging Bar for GCr15SiMn2 Bearing Steel Applied for High-power Wind Main Bearings

作　　者：陶士君 肖爱平 李旭 余雷 田浩 刘月云 罗文锦 Tao Shijun;Xiao Aiping;Li Xu;Yu Lei;Tian Hao;Liu Yueyun;Luo Wenjing(Technology center,Daye Special Steel Co.,Ltd.,Huangshi 435001,China)

机构地区：[1]大冶特殊钢有限公司技术中心,黄石435001

出　　处：《特殊钢》2023年第5期39-42,共4页Special Steel

摘　　要：大冶特钢通过70 t电弧炉→LF→RH精炼→20 t模铸钢锭→锻造的工艺试制出直径Φ800 mm高碳铬轴承钢GCr15SiMn2大规格锻材,产品用于制作5 MW及以上大功率风电机组主轴承。采用控制钢中残余元素w[Ti]≤0.0016%、高碱度渣精炼[CaO(48%~55%)-SiO2(3%~8%)-Al2O3(30%~40%)-MgO(4%~6%),碱度R≥6]、RH真空处理、保护浇注、合理的浇注工艺(浇注温度和速度)及两镦两拔锻造(综合锻造比≥4)等措施,钢材的低倍组织级别1.0级,钢中B细、D细、DS类夹杂物均不大于1.0级,碳化物带状级别CZ7.5级,钢的淬透性J45 mm达到61.0HRC,各项性能均满足标准要求。Daye Special Steel trial-producedФ800 mm diameter high carbon chromium bearing steel GCr15SiMn2 large specification forging material through the process of 70 t electric arc furnace+LF+RH refining-20 t die casting ingot-forging,the products are used to make≥5MW high power wind turbine main bearings.By means such as controlling the residual elements[Ti]≤0.0016%、high basicity slag refining[CaO(48%-55%)-SiO2(3%-8%)-Al2O3(30%-40%)-MgO(4%-6%),basicity R≥6],RH vacuum treatment,protective casting,reasonable pouring process(pouring temperature and speed),two times upsetting and stretching process(comprehensive forging ratio≥4)and other measures,it can meet the microstructure level of steel 1.0 class,the rating of inclusions for B fine,D fine and Ds in steel were 0.5-1.0 class,carbide banding level CZ7.5,the hardenability J45 mm reach 61.0HRC,all performance meet the standard requirements.

关 键 词：GCr15SiMn2模铸锻材 大功率风电主轴承 高碳铬轴承钢 模铸 镦拔工艺 

分 类 号：TF033[冶金工程—冶金物理化学] TG156.2[金属学及工艺—热处理]