tungsten Carbide valve core,valve seat HRA>91.5 TRS> 2600 Grain size 0.5, 0.6, 0.8 high quality wearability and impact
tungsten Carbide valve core, valve seat
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tungsten Carbide valve core,valve seat HRA>91.5 TRS> 2600 Grain size 0.5, 0.6, 0.8 high quality wearability and impact