... machining > Painting 2. Material: Alloy Steel, Quality Carbon Structural Steel, Cast Iron, Brass etc. 3. Heat Treatment: Induction harden with High/Middle ... Frequency Quenching furnaces, Tempering ,Carburizing etc. 4. Surface Treatment: Black Oxide, Painting, Zinc Plating etc. 5. Offering ... win-win business relations with you in the near future. Cast Iron Sprockets