Piston ring materials for automobile engines are being changed from current cast iron to steels due to the severe operating conditions of engines, and cost saving for piston ring production process. Hitachi Metals has developed and now is supplying high quality steels,

ASL42 and ASL81 for this applications. ASL42 and ASL81 which are C-Cr martensitic stainless steels show excellent wear resistance, corrosion resistance and heat resistance in comparison with Si-Cr steel and cast iron rings.

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