| http://www.w3.org/ns/prov#value | - Cold pig iron is very brittle, high in carbon and other impurities and of low tensile strength but it can be converted into soft but tough wrought iron by ???puddling.??? The iron is heated, iron oxide and certain slag-forming materials are added and the molten mass is stirred, causing the iron oxide to react with the carbon to form iron while the slag removes other impurities.
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