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the tensile strength, hardness and yield strength of steel depends on the amount of carbon in it. this is because amount of pearlite increases linearly with % of C in steel from 0-0.77%. Elongation (ductility) is caused by the ferrite in the steel which forms plastic deformation.

there are two ways of treating steel:

1) quenching- this is when red hot steel is rapidly cooled to R.T. this traps most of the carbon in the steel forming pearlite that makes it hard and brittle

2)Normalising- this is when red hot steel is cooled slowly to R.T and allows carbon to dislocate and form ferrite which makes it ductile. this is how mild steel is manufactured.

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12y ago

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