Product name:In/Ex valve for diesel engine 

Material for engine valve: 

1.Si-Cr(4Cr9Si2/4Cr10Si2Mo)

2.Ni-Cr-Mn-N(21-4N/23-8N)

3.Ni(Inconel 751/Ni80A)

Harden process for valve seat’s surface

1.high frequency quenching 

2.High alloy welding

Harden process for valve stem

1.chrome-plating

2.Nitriding 

3.Quenching/spray welding

Application: truck engine

skype: lily.d8

julian(at)sjzfeirun(dot)com