1) Steel alloy 
Mangalloy, also called manganese steel or Hadfield steel, is a steel alloy containing an average of around 13% manganese. Mangalloy is known for its high impact strength and resistance to abrasion once in its work-hardened state. ==Material properties== Mangalloy is made by alloying steel, containing 0.8 to 1.25% carbon, with 11 to 15% manganese. ...