Abstract: Heat-treated cast grinding members for use in a grinding mills such as grinding balls, lining plates, crushing jaws, etc. are disclosed, which members are subjected to abrasion and repeated impact in the presence of a wet corrosive medium. These members consist essentially of 0.5 to 2.8% carbon, 15 to 35% chromium, and must satisfy the relationship percent Cr -- 8 .times. %C = 11 to 16%. These members are hardened without subsequent tempering from a temperature range of 1075.degree. to 1175.degree. C and evidence a metallographic structure of primary chromium carbides in a ferrite-free matrix which is a predominantly martensitic solid solution consisting essentially of from 0.3% to 0.45% of carbon and from 14% to 18% of chromium. The elements have a Rockwell "C" hardness of at least 60.