Material for valves:

40Cr,4Cr9Si2,4Cr10Si2Mo,21-4N,23-8N.

Si-Cr series high alloy valve steel:4Cr10Si2Mo

Ni-Cr-Mn-N series high alloy valve steel: 21-4N,23-8N,SNCrw, Nimonic 80A,Inconel 751

Ni-Cr-W series high alloy valve steel: （SNCrW)Nickel base heat resistant alloy steel:Nimonic 80A

Harden process for valve seat’s surfaceHigh Frequency quenchingSatellite WeldingRolling

Surface treatment:1.Chrome plating2.Nitriding

 ENGINE VALVE FOR CARS:

TOYOTA,AUDI,BESFORD,BMW,CATERILLAR,CUMMINS,DAF,DAIHATSU,DAEWOO,FORD,FIAT,HILLMAN,HINO,HONDA,HYUNDAI,ISUZU,KAWASKI,KIA,LADA,LEYLAND,LISTER,MAZDA.BENZ,MITSUBISHI,NISSAN,OPEL,PAYKAN,PERKINS,PEUGEOT,ROVER,SUBARU,SUZUKI,VOLVO,VOLKSWAGEN ,PLANE AND MARINE AND SO ON. 

ENGINE VALVE FOR SHIPS:

MAN B&W, DAIHATSU, YANMAR, SKL,HAISHIN,UEC/UET,SULZER,PIELSTICK,CHINA DIESEL,WARTSILA,AKASKA, AND SO ON