free ship rik std genuine set 70MM piston rings
Surface Treatment:The hard chromium plating layer has excellent characteristics which combine the original properties of chromium metal with the advantages of erectro-deposits. The main features of hard chromium plating are as follows :
1.Extermely high hardness of HmV(Micro Vickers) 800 to 1100(cf. gray cast iron 220 to 270)
2.High melting point of approx. 1800°C (cf. cast iron 1200°C)
3.Good thermal conductivity and corrosion resistance.
4.Low friction factor and excellent wear resistance.
Such features are very effective in preventing piston ring wear.