1.1 This specification covers Hadfield austenitic manganese steel castings and alloy modifications. 1.2 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text This specification covers Hadfield austenitic manganese steel castings and alloy modifications. The castings shall be suitably heat treated to achieve toughness and ductility. This heat treatment shall consist of uniformly heating the castings to a tem