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通过对RH到站钢液的初始条件、吹氧时机、真空室抽气制度和提升气体模式等的优化,开发了180 t RH真空炉的快速高效脱碳工艺。控制RH到站w(C)=(250~500)×10-6,w(O)=(300~650)×10-6;适当快速降低真空室压力低于150 Pa;RH到站时w(C)/w(O)>0.66时,在脱碳前期进行强制吹氧脱碳;提升气体使用模式为1.0G m3/h(0~4 min),0.8G m3/h(4~6 min),1.0G m3/h(6 min以后)。工业试验结果表明:运用新工艺,脱碳处理15 min后,大部分炉次钢包内钢液的w(C)<15×10-6。
A rapid and efficient decarburization process for a 180 t RH vacuum furnace was developed by optimizing the initial conditions of the molten steel at the RH station, the timing of oxygen blowing, the evacuation system of the vacuum chamber and the mode of upgrading the gas. Control RH to the station w (C) = (250 ~ 500) × 10-6, w (O) = (300 ~ 650) × 10-6; properly quickly reduce the pressure in the vacuum chamber below 150 Pa; Forced oxygen blowing decarburization was carried out in the early stage of decarburization with 1.0G m3 / h (0 ~ 4 min) and 0.8G m3 / h (4 ~ 6 min) ), 1.0G m3 / h (after 6 min). The industrial test results show that the w (C) <15 × 10-6 of liquid steel in most furnace ladle after 15 min of decarburization by new technology.