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三、现行冶炼工艺举例 1.低合金钢和护环钢的冶炼有些国家根据不同的产品,采取不同的冶炼工艺,见表6。 2.日本制钢所室兰工厂超低磷硫钢的冶炼室兰工厂用EAF+LF(电弧炉+钢包精炼炉)法生产超低磷硫(<40PPm)钢的冶炼工艺如下: 用电炉精炼,在氧化期得到低于30PPm的超低磷钢。但最后由于还原期回磷,磷含量上升到50PPm。该厂使用的方法是,在电弧炉中保留氧化期,在钢包精炼炉中保留还原期,这样就可能使钢水中的磷含量降到30PPm以下。氧化渣和部分磷
Third, the current smelting process 1. Low-alloy steel and retaining ring steel smelting Some countries according to different products, take a different smelting process, see Table 6. 2. Soray Factory Sulan plant ultra-low-sulfur steel smelting room Lan plant EAF + LF (electric arc furnace + ladle refining furnace) method of production of ultra-low-phosphorus sulfur (<40PPm) steel smelting process is as follows: , In the oxidation period to get less than 30PPm ultra-low phosphorus steel. However, due to the final reduction of phosphorus, phosphorus content rose to 50PPm. The plant uses the method of keeping the oxidation period in the EAF and keeping the reduction period in the ladle refining furnace so that the phosphorus content in the molten steel may be reduced below 30 ppm. Oxidized slag and part of phosphorus