We produce spares for Impactor with a special alloy of high Carbon high Chromium along with combination of Nickle and Moly. The normal high chrome alloy is ASTM A532 grade. After the selection of best alloy combination a special heat treatment is given to produce spares with maximum toughness and minimum brittleness. The final hardness of upto 650 HB is achieved to deliver maximum wear life of spares.