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of iron and form planes of weakness, wrought iron is anisotropic, its strength varying depending on its orientation. Wrought iron may typically be composed of around 99.4% iron by mass. The presence of slag can be beneficial for blacksmithing operations, such as forge welding, since the silicate inclusions act as a flux and give the material its unique, fibrous structure. The silicate filaments in the slag also protect the iron from corrosion and may diminish the effect of fatigue caused by shock

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