... parts/investment casting/sand casting/ CNC machining DescriptionCNC machining process with sand castingMaterial Cast iron, grey iron, ductile iron, stainless steel, cast steel ,aluminumCertificationStandardISO9001:2008ASTM,JIS,GB, ... technics Materials different kinds of stainless steel,cast steel, carbon steel, iron,grey iron, ductile iron, cast iron,alloy,zinc,brass, copper,bronze,or aluminum ...