... 42CrMo. 3.heat-treated hardness 40-44HRC. 40Cr steel body use or 42CrMo, heat-treated hardness 40-44HRC, high strength and ... wear resistance; the head by a low pressure vacuum sintered carbide, good weldability and bending strength, wear etc. application: engineering ... duration of use, short time to replace them to ensure a higher daily work process, savings. Rotary Drilling Rig Carbide Coal Mining ...