首先在我国试验成功并投入生产的全氧侧吹转炉炼钢新工艺,从1973年6月在沈阳市第一钢厂开始工业性试验以来,获得了迅速发展。继1975年8月天津二钢首破500炉大关、上钢五厂于同年10月再创732炉炉龄新水平后,1976年来,唐山钢铁公司广大工人、干部和技术人员,在党的领导下,以阶级斗争为纲,坚持党的基本路线,狠批“三项指示 First of all, in our country, the new oxygen-blown BOF process, which has been successfully tested and put into production in our country, has enjoyed rapid development since it started its industrial test in Shenyang City in June 1973. Following the August 1975 Tianjin two steel first broke 500 mark, the steel plant in October the same year to create a new 732 furnace level, in 1976, Tangshan Iron and Steel Company workers, cadres and technical staff at the party Under the leadership of class struggle as the key link, adhere to the party’s basic line, and severely criticized the "three directives