... ,Precision casting 2)Material:stainless steel,carbon steel 3)pump impeller Investment casting procee have the clear advantage than othersMaterialStainless steel ... ,AISI,BS,DIN,JIS,ETCProcessInvestment castingMachiningDrilling,milling,drinding,threading,CNC maching,ectFinishingSand blasting,passivation,polishing,electro-polishing,machining,ectCertificateISO9001:2000 impeller casting