what is the simple difference between iron and steel
Summary: 1  1. Steel is an alloy or iron, and cast iron is a hard grey metal. 2  2. Cast iron is cheaper than steel, and has a low melting point with the ability to mold easily. 3  3. Steel is mild and harder to cast, and loses viscosity. 4  4. Cast iron is used for making manhole covers, piping and guttering.