Blacksmithing dates from the earliest iron age, which started about 1500 BC in central Asia. Many of the tools and techniques date from earlier times.
The metal worked by the blacksmith is either the old ductile wrought iron or the modern steel. Wrought iron is the product of early iron furnaces called bloomeries. It has no carbon and cannot be hardened. Steel is iron with a small amount of carbon (0.1 to 1.5%) that makes it hardenable. Early steel was an expensive product made in small quantities. Modern low carbon steel has almost entirely replaced Wrought Iron. Modern steel has been available in bulk since the 1860's.
Cast iron is iron with 2 to 3 percent carbon or more. It is brittle and can only be shaped only by casting in a mold or by machining. It is not forged. Cast iron has many uses because it is inexpensive to produce items from it. Cast iron is also better for things like the body of machine tools or engine blocks because it is stiff and is vibration dampening. |