Bar iron : See under Iron.

Example:


Taxonomy
iron, wrought iron, slag, metal, pig iron, charcoal, carbon, bloomery, finery, bloom, bar iron, Metallurgy, flat bars, impurities, processes, hearth, History, origin.

Defination from the web:
Bar iron—iron in bars, which are the usual product of the finery forge, but not necessarily made by that process. ... From the late 1750s, ironmasters began to develop processes for making bar iron without charcoal. ...