1.国外电炉炼钢的发展自氧气顶吹转炉问世以来,在工业发达国家,平炉逐渐被淘汰(特别是在欧美和日本),相反,电炉炼钢迅速发展,不仅产量增加,而且在冶炼装备,主体及配套工艺等方面亦都取得了重大突破,已经完全改变了原有的工艺路线,成为与转炉炼钢相竞争的炼钢手段。七十年代世界粗钢总产量年增长 1. The development of foreign electric furnace steel Since the advent of oxygen top-blown converter, in industrialized countries, open hearth gradually been eliminated (especially in Europe and the United States and Japan), on the contrary, the rapid development of electric steelmaking, not only increased production, but also in the smelting equipment , The main body and supporting processes have also made major breakthroughs in the process has completely changed the original route to become a competitive steelmaking converter means. In the seventies the world crude steel output increased year by year