Cast Steel vs. Carbon Steel

http://metals.about.com/od/metalterminology/l/blglossary_c.htm

Cast Steel Definition: A term originally applied to crucible steel and sometimes today used to describe tool steels. The term is misleading and is falling into misuse. It can also be applied to steel castings made by pouring molten steel into a mould but which are not subject to further forging or rolling.

Carbon Steel Definition: A steel whose properties are determined primarily by the amount of carbon present. Apart from iron and carbon, manganese up to 1.5% may be present as well as residual amounts of alloying elements such as nickel, chromium, molybdenum, etc. It is when one or more alloying elements are added in sufficient amount that it is classed as an alloy steel.

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