... . OEM casting 3. Genuine manufacturer 4.ductile iron elevator parts ductile iron elevator parts:Materials: gray iron, ductile iron, carbon steel, stainless steel, alloy steel and ... , frame, manhole covers, pump parts, handwheel, valve, flange, bollard, pilingaccessories, counterweight iron, construction machinery parts and other industry machinery parts Equipment: Laboratory:Brife Introduction ...