Features: --Superior wear resistance --High hardness and mechanical strength --Good corrosion resistance --High precision for tolerance They're widely used in oil&gas, bearings, ball screws,valves and flow meters.pen,spraying machines,pump,machinery parts and other industries. Grade Density g/cm3 Hardness HRA(hv) T.R.S (M Pa) Performances & applications recommended YG6 14.9 89.5 2150 Good Wear resistance, used for hard wood,processing original wood,aluminum section bar,brass rod and cast iron. YG8 14.6 89 2320 Suitable for the roughening of cast iron and light alloys and also for the milling of cast iron and low-alloy steel.