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Piston ring:
1)High Quality
2)Full Range
3)Good Service
4)Excellent Package
Materials (_)
1)black cast iron ball
2)alloy cast iron
3)high-alloy cast iron
4)stainless: 6Cr 13Mo
72A
304
Performance():
1)good thermal stability
2)high bending strength
3)good stretch
Hardness():
1)basic hardness is HRB and HRC
2)Chromium and Nitride layer are HVO. 1
Piston Ring (DSC00725)
