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1.原料:在电弧炉内冶炼化学成份相当于我国滚铬15的轴承钢时,金属炉料一般由轴承钢的返回钢和清洁的优质炭素废钢组成。配入炭量要使炉料熔清时金属含炭0.90~1.00%,以便在氧化期除去0.20~0.30%C。含铬返回钢配入量限制在炉料熔清时金属熔池中含铬量小于0.50%。因为根据一些工厂的经验,熔清含铬量对轴承钢的冶金质量有深刻影响,因铬含量会降低钢中氧的活度。 2.氧化期的熔池温度最后至少要达到1615℃(插入式热电偶测)。
1. Raw materials: Smelting chemical composition in the electric arc furnace is equivalent to China’s rolling chromium 15 bearing steel, the metal charge generally consists of bearing steel return steel and clean quality carbon scrap. With the amount of carbon to make the charge melted metal containing carbon 0.90 ~ 1.00%, in order to remove 0.20 to 0.30% C during the oxidation period. Chromium return to the amount of steel contained in the molten metal melting pool limit the amount of chromium is less than 0.50%. Because, based on the experience of some plants, the amount of chromate contained in molten steel has a profound impact on the metallurgical quality of the bearing steels because chromium levels reduce the activity of oxygen in the steel. 2. Oxidation of the pool temperature to reach at least 1615 ℃ (plug-in thermocouple measured).