Piston Ring Materials

Piston rings are made up of materials suiting the application:

optical microscope

  • High grade cast iron alloy
    Most of the piston rings are made of this grey cast iron material.
  • Spheroidal graphite iron (S.G. iron)
    Top groove rings are mostly made of S. G. iron which is ductile in nature and has higher modulus of elasticity.
  • Special alloy steel
    Top groove rings of some high technology engines are made of special alloy steel with high modulus of elasticity.

ductile_iron_microstructure

  • Sintered material
    Piston rings for hydraulic applications are many times made of sintered material for improved wear resistance and anti-friction properties esp. in dry condition.
  • Other special materials
    Piston rings can me made of other special materials also to suit the special application conditions.