《天工开物·中篇·锤锻》
铁制器具是由生铁炼成的熟铁做成的。先将铁铸成砧，作为承受敲打的垫座。
凡治铁成器，取已炒熟铁为之。先铸铁成砧，以为受锤之地。
Iron tools are made of wrought iron, which is refined from pig iron. The iron is first cast into anvils, which serve as supports to bear the hammering.