OEM No/Model: C4994143/C4995554
The engine valve OEM : C4995554 ( intake valve )
C4994143 (Exhaust valve )
The material and process : 23-8N+4Cr9Si2
surface treatment : Chrome plating ,salt bath nitriding
Welding : two-piece frication welding ,tip end resistant welding ,seat hardfacing .
Heat treatment : Full solution ,hardening & tempering ,induction hardening (tip and seat ) Profile Hardening
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