一、前言鞍钢第三炼钢厂大型固定式平炉,采用废钢矿石法熔炼的低碳沸腾钢 B_2F,大部分轧制热轧纵剪带钢,做为制造焊接钢管,冷轧带钢,自行车零件及其它产品的原料。热轧纵剪带钢质量上存在的关键问题是分层。1963年和1964年两年产生的分层废品计达13,485吨,这不仅给国家造成了巨大的损失,更严重的影响了用 I. Introduction Anshan Iron and Steel Co., Ltd. third large-scale fixed-type flat hearth furnace, the use of scrap ore melting low-carbon steel boiling B_2F, most of the rolling hot-rolled strip, as the manufacture of welded steel pipe, cold-rolled strip, bicycle parts And other products of raw materials. The key issue in the quality of hot-rolled slitting strip is stratification. The amount of stratified waste generated during the two years of 1963 and 1964 amounted to 13,485 tons, which not only caused huge losses to the country, but also severely affected the use of