... 42 3)Material is 40CR 4)Suitable:track link,track shoe,excavator part High Strength Track Bolt and Nuts 40Cr1)The mechanical ... 92)Case hardening HRC 38-423)Material is 40CR4)Suitable:track link,track shoe,excavator part Advantages / Features:1). Materials:Our company ... the Controlled-atmosphere Automatic heat treatment Furnace, we also have four mesh belt convey furnaces, Can deal with the products in ...