GG20/GG25 Sand Casting V Belt Cast Iron Pulley 1)material:gray iron GG20, ... 3)ISO9001 4)OEM GG20/GG25 Sand Casting V Belt Cast Iron PulleySpecification:Materials: gray iron HT200 and HT250Surface ... blasting, Painting, Electro-plating, Chemical Plating, and other machining processing.InspectionEquipmentsSpectrum analysis instrument, Metallurgical analysis, Tensile strength tester, Hardness tester ...