... carbon steel, low alloy steel, ductile iron, gray cast iron, aluminum alloy InspectionUltrasonic test, magnetic ... particle test, tensile test, X-ray test, Liquid penetrate test, etc.Surface treatmentAnti-rust ... , package, barrel, etc.Casting OEM serviceMaterial: iron, gray iron, ductile iron, steel, stainless steel, carbon steel, alloyProcess: ...