pig iron for steel making

例句：

1. 1.The steel mill uses pig iron to make steel.
   钢铁厂使用生铁来制造钢材。
2. 2.The carpenter used pig iron to shape the wood.
   木匠用生铁来塑造木材。
3. 3. The pig iron was heated and then poured into molds.
   生铁被加热后倒入模具中。