Valve seat 1.materials:iron powder 2. we can make as your drawing 3. hardness is 42-50 Valve seat Our factory has specialized in manufacturing items of metal powder metallurgy structure components spare parts for 21 years. We have exported our products to US, Korea, Germany, Iran,Pakistan,Greece ,Turkey and so on. Kingbell are one of the Designer, Manufacturer for Powder Metallurgy parts, Auto & ...