... ,4. Material: C45, A3, cast iron, stainless steel5. Surface treatment: Oxide black, galvanization, nickelizing, chromeplating6. Model: type A, type B, and type ... , AfricaMaterialC45,A3, cast iron, stainless steel, copper etcManufacturing methodweleded or forgedHeat treatmentHigh frequency quenchingSurface treatmentOxide black, galvanization, nickelizing, chromeplating, sandblasting Model Type ...