are the grains bigger is steel or iron?

Question

does iron have smaller grains? and does this make it weaker. or is it the other way around. physics coursework for tomorrow, and I've found two bits of information saying different things. thanks

Answer 1

iron is often produced in a cast state with an excess of carbon.
In this state it it cools slowly and forms large grains that often have carbon at the boundaries.

Steel on the other hand is rolled and worked into shapes generally at the mill.

Answer 2

There are different measures for strength - tensile strength, yield strength, ductility, etc. I think iron generally has a coarser grain structure, but that can do with how it's heat treated or cooled during casting.

Vince

Answer 3

Depends more on the rate of cooling than the
composition of the alloy.