1869 R. S. Stenton 1/1 Cast-steel, the product of malleable iron, made in a sinking-fire, avoids the smelting process.
1946 (Pennsylvania Dept. Internal Affairs) Jan. 30 The Freedom Forge, using cold blast charcoal pig iron, worked in a ‘sinking fire’ or Catalan Forge, produced some of the best wrought iron in the country.