Different grades of steel have been manufactured since the invention of steel. The grade variations of steel support its usage for different applications. The variation in grades of steel is achieved by varying the amount of carbon involved in the manufacturing process. According to industrial standards the proportion of carbon for optimum results is about 0.2% to 2.1%. Chromium, tungsten and manganese base iron can also be added in order to enhance base properties of steel. Varying proportion of steel plays a key role in the ductility of steel and increasing tensile strength that contributes to its high durability. The carbon inclusion can control thermal and electrical influences of the steel efficiently. However the materials are responsible to maintain uniformity within the crystalline structure of the basic iron atom.

Steel composed of these recipes highly depends on carbon in the formation of long lasting alloys. However the composition of tungsten, manganese and cobalt are also present with some unspecified proportions. The carbon composition makes steel hard and strong making it withstand under harsh thermal conditions successfully. However steel made up of carbon possess low ductility and anti-corrosive properties. Corrosion causes rusting to the steel due to oxidation those results in weakening of steel. Bridges are the example to portrait corrosion as bridges get corrode very early even after few years of construction. Stainless steel is a popular form of steel which never corrodes due to chromium plating. The best proportion of chromium plating is 10.5% to 11.0% of chromium

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