Why can't casting pig iron be made into steel?
Not only is the gray cast iron, all can not be used for steelmaking, because the silicon content of cast iron is too high, if it is used to steelmaking operation will be very difficult, the cost is not appropriate, it also involves many other questions.
This problem has already been decided in the iron smelting plant. The pig iron produced from the blast furnace is divided into steelmaking pig iron, namely white cast iron. And cast iron, that is, gray iron.Since it has been made clear, of course, steel mills do not use gray iron for steelmaking,
Hot metal and pig iron for steelmaking require no more than one point two percent silicon, but the lowest iron content of cast iron is higher than that, so no steel mill will use casting iron. What you said is mainly used for gray iron casting, such as casting bed some machine tools, as well as some aspects of casting pipe etc..
