#300 what is the chemical composition of steel?

What is the chemical composition of steel? - civil engineering

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Free Chegg Question

what is the chemical composition of steel? and what is the effect of carbon on the mechanical properties of steel?

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Free Chegg Answer 1

Steel is an alloy of iron and carbon. Carbon is the primary alloying element, and its content in the steel is between 0.002% and 2.1% by weight. Additional elements are also present in steel: manganese, phosphorus, sulfur, silicon, and traces of oxygen, nitrogen and aluminum. Alloying elements intentionally added to modify the characteristics of steel include: manganese, nickel, chromium, molybdenum, boron, titanium, vanadium andniobium.

  iron by itself is a very weak metal and it does not find any good use in the industrial applications. when carbon is added to iron as a solid solution it adds strength to it. this gives us the steel alloy. if you refer the iron-iron carbide equilibrium diagram then you will find it amazing how iron and carbon can exhibit different crystal structure this leads to the formation of a lot of variety of steel. steels can be heat treated from being very soft to being very hard and the opposite can be done as well. very tough steels can be made, very ductile steels can be made , very hard steels can be made , etc. 

Free Chegg Answer 2

Steel is an alloy that is made by combining iron and another element which is carbon most of the time. Steel can also be made by combining iron with other elements such as manganese, vanadium, tungsten and chromium. These elements act as hardening agents for iron therefore making in stronger.