Why are two kinds of materials in pig iron not composite materials, but metallic materials?
But I don't know which two kinds of pig iron contain.Cast iron, or steel, naturally contains five conventional elements, namely carbon (C), silicon (Si), manganese (Mn), phosphorus (P), and sulfur (S). It contains only five elements of steel, if the Si or Mn content more than 1%, are generally called carbon steel, alloy steel and don't count. Si, Mn and other alloy elements content to a certain extent is called alloy steel (high alloy steel or low-alloy steel or alloy cast iron). Even alloy cast iron, of course, is still considered a metallic material.A composite should be a complete piece of material that is made up of two or more than two different materials and has a distinct interface separating from the need for a particular characteristic.Obviously, the use of pig iron is usually not good for making composite materials.
A composite is two or more than two kinds of materials get together to form the material, although get together, but all in all, to maintain their own respective characteristics, and the pig does not contain two kinds of materials, only contain elements, you can't take it apart".
Composites consist of metal, composite and non-metallic materials, and composites contain metal materials. They are two compatible concepts. You can't put them together. This is illogical.
