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Engineering Materials

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Mild steel
also called plain-carbon steel, is a metal alloy, a combination of two elements, iron and carbon.
High Carbon Steel
Iron alloyed with up to 2.5 per cent carbon. it's hard and used for cutting tools
Stainless steel
Is an alloy of Iron with a minimum of 10.5% Chromium. Chromium produces a thin layer of oxide on the surface of the steel known as the 'passive layer'. This prevents any further corrosion of the surface. Increasing the amount of Chromium gives an increased resistance to corrosion.
Has a low density. This means that it is lightweight for its size. It also has a very thin layer of oxides on the surface, which stops air and water getting to the metal, so it resists corrosion.