high density, hardness, abrasion and corrosion, resistance at high temprature an excellent heat conductivity and anti-creep

 While the crushing strength of valve  guide  is reached 500Mpa , the porosity >12%.we use vacuum oil-soaked, so  there has enough lubricating oil in the hole, which can make them have a good self-lubricating property  and abrasion resistance, Using unique technology and formula, has a high density {7.88g/sqcm} and hardness. Excellent high temperature and abrasion resistance. corrosion resistance, heat conductivity, high temperature strength,anti-creep performance at high temperature and the thermal expansion coefficient matching with the cylinder head and good low temperature mash inability, as long as a long serviced lift of 2000,000km,Consequently the valve seats can be widely applied in various internal combustion engines, such as gasoline, diesel and natural gas, which cylinder diameter <Φ 180mm,