由于用户对钢材质量的要求,使日本特殊钢比率不断增加。用高炉—转炉大量生产普通钢的各大钢铁公司也强化不锈钢和特殊钢生产。日本钢管公司过去生产油井高级无缝管用的特殊钢、不锈钢和超合金钢,是在京滨厂50吨电炉上熔炼。其方法是用废钢和铁合 As the user of the quality of steel requirements, so that the proportion of Japanese special steel continue to increase. Major steelmakers, which produce large amounts of ordinary steel from blast furnaces and converters, also strengthen the production of stainless steels and special steels. In the past, Nippon Steel Pipe Co., Ltd. produced special steel, stainless steel and superalloy for advanced oil well seamless tubes, which were melted on a 50-ton electric furnace at Keihin Plant. The method is to use scrap and iron together