Neither wrought iron nor mild steel contain enough carbon to be hardenable by heating and quenching.It is a highly refined iron with a small amount of slag forged out into fibres. The modern functional equivalent of wrought iron is mild or low carbon steel. It was given the name wrought because it was hammered, rolled or otherwise worked while hot enough to expel molten slag. Before the development of effective methods of steelmaking and the availability of large quantities of steel, wrought iron was the most common form of malleable iron. Wrought iron is tough, malleable, ductile, corrosion-resistant and easily welded. It is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight), which gives it a "grain" resembling wood that is visible when it is etched or bent to the point of failure. Wrought iron is an iron alloy with a very low carbon (less than 0.08%) content in contrast to cast iron (2.1% to 4%).
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