Engineering Materials
Which of the following represents the allotropic forms of iron?

Alpha iron, gamma from and delta iron
Alpha iron, beta iron and gamma iron
Body centered cubic iron and face centered cubic iron
Alpha iron and beta iron

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Engineering Materials
Steel contains

Alloying elements like chromium, tungsten nickel and copper
80% or more iron
Elements like phosphorus, sulphur and silicon in varying quantities
50% or more iron

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