众所周知，在任何一个好的铸铁生产厂家，铸件废品率越低则越需购进大量回炉铁；生产的铸铁牌号越高亦越需购进大量的废钢。由于从四面八方进厂的回炉铁和废钢不可能象新生铁和铁合金那样按标准供应，加之它们的总加入量一般均在６０％以上，所以对于绝大多数用冲天炉化铁... As we all know, in any good cast iron manufacturer, the lower the cast scrap rate, the more you need to buy a large amount of recycled iron; the higher the cast iron grades, the more you need to buy a lot of scrap. Since it is not possible to replenish iron and steel scrap from all over the plant to standard supply like fresh pig iron and ferroalloy, and their total additions are generally above 60%, so for the vast majority of cupola iron ...