高铁齿轮用钢18CrNiMo7-6电渣生产工艺实践  

Production Practice of 18CrNiMo7-6 Electroslag Process for High-speed Rail Gear Steel

作　　者：王之香[1] 南海[1] 张锦文[1] Wang Zhixiang;Nan hai;Zhang Jinwen(Technology Center,Shangxi Taigang Stainless Steel Co.,Ltd.,Taiyuan030003)

机构地区：[1]山西太钢不锈钢股份有限公司技术中心,太原030003

出　　处：《特殊钢》2023年第3期29-33,共5页Special Steel

基　　金：山西省重点研发计划项目(201903D111008)“高铁齿轮钢产品关键生产工艺技术开发及应用”。

摘　　要：为达到高铁齿轮钢高洁净度,尤其是单颗粒D类球状夹杂物尺寸≤10μm的目标,开发了电渣工艺生产高铁齿轮用钢18CrNiMo7-6(/%:0.15~0.21C,≤0.40Si,0.50~0.90Mn,1.50~1.80Cr,1.40~1.70Ni,0.25~0.35Mo,≤0.010P,≤0.010S),Ф250 mm钢坯生产工艺流程:EBT电弧炉-LF-VD-模铸5.6 t电极坯-电渣重熔-锻造-退火-检验。采用5.6 t电渣锭,渣系为CaF_(2)∶Al_(2)O_(3)∶CaO∶MgO=65∶20∶10∶5,冶炼过程中熔化率控制在500~550 kg/h,渣量为180~200 kg,采用新渣系后生产高铁齿轮钢的洁净度为[O]≤15×10^(-6),[H]≤1.0×10^(-6),P≤0.008%,S≤0.005%,A、B、C、D、DS类非金属夹杂物级别≤1.0级,单颗粒D类球状夹杂物尺寸≤10μm,淬透性、力学性能等均符合要求。In order to achieve the goal of high cleanliness of high-speed gear steel,especially the size of single-Particle D spherical inclusions≤10μm,electroslag process was developed to produce high-speed rail gear steel 18CrNiMo7-6(/%:0.15-0.21C,≤0.40Si,0.50-0.90Mn,1.50-1.80Cr,1.40-1.70Ni,0.25-0.35Mo,≤0.010P,≤0.010S),Φ250 mm steel billet production process is EBT electric furnace-LF-VD-casting 5.6 t electrode billet-electroslag remelting-forging-annealing-inspection.The electroslag slag system of 5.6 t electroslag ingot is CaF_(2)∶Al_(2)O_(3)∶CaO∶MgO=65∶20∶10∶5,in the smelting process the melting rate is controlled at 500-550 kg/h,and the slag amount is 180-200 kg.Compared with the old slag system,after adopting the new slag system the cleanliness of the produced high-speed gear steel is[O]≤15×10^(-6),[H]≤1.0×10^(-6),P≤0.008%,S≤0.005%,and non-metallic inclusion rating of A,B,C,D and Ds series≤1.0 grade,and the size of single-Particle D spherical inclusions is≤10μm.Other hardenability and mechanical properties meet the requirements.

关 键 词：18CrNiMo7-6 高铁齿轮钢 电渣重熔 洁净度 淬透性 

分 类 号：TF142[冶金工程—冶金物理化学] U270.41[机械工程—车辆工程]