Question - What Does Allotropic Mean What Does Iron And Steel Have To Do With It?
Answer -
Iron is a metal with polymorphism structure. Each structure stable in the range of temperature, for example deltairon with bcc structure in the range of 15381394C changes to gamma Iron with fcc in the range of 9121394C and gamma iron to AlfaIron etc. For hardening of the metal, this quality of iron is exploited.