Refined Iron

Refined Iron is a component that was used to craft many IndustrialCraft 2 recipes before it entered experimental phase. Recipes using it replaced it with an Iron Ingot, a type of Plate (often Iron), or an Item Casing. It has been re-added, but as a form of Steel.

Recipe
Refined Iron was created by smelting an Iron Ingot in a Furnace:

But now it is made in the IC2 Blast Furnace: