Graphite cast iron pneumatic valve performance and application in hvac system

First of all we know about the material properties of the graphite cast iron!
ink manufacturing cost is higher than gray cast iron, cast iron but than grey cast iron of high strength and toughness, and can be compared with cast steel castings to choose material.
graphite cast iron tensile strength is higher than grey cast iron, cast steel, such as using appropriate heat treatment, can reach the level of forging steel. And the same composition of graphite cast iron with different heat treatment process, as long as the tensile strength can be in a very wide scope change ( 400 - 1500MPa） 。
in the same condition of tensile strength, ink yield strength is higher than steel of cast iron, the graphite cast iron can be used as a valuable performance of structural materials, is also increasingly widely chosen as one of the reasons for one of the important parts of mechanical and electronic products.
ink elongation is not as good as cast steel, cast iron, but better than gray cast iron, and can meet most of the general requirements of mechanical and electrical products parts at work, because most of the parts of mechanical and electronic products allows only a tiny plastic deformation at work ( According to the yield strength of 0. 2 to request, elongation should be less than 0. 2%) 。
elastic modulus is higher than gray cast iron graphite cast iron, it shows its rigid than gray cast iron, but slightly lower than that of cast steel.
the ink the impact toughness of cast iron is not as good as cast steel, but far higher than that of gray cast iron, have been able to meet in the general work under dynamic load of parts.
graphite cast iron in the fatigue strength is more than twice as high than gray cast iron, close to 45 steel, and, because of the large steel of cast iron notch sensitivity than ink fatigue strength decrease quickly, so it can be the ink iron and steel complex shape parts production of crankshaft etc.
ink wear-resisting, heat resistance and corrosion resistance of cast iron is better also, vibration is worse than gray cast iron, but is much better than the steel, the vibration damping ratio of 1:1 roughly. Thereof. 3.
although than gray cast iron graphite cast iron casting performance is poor, prone to defects, but can be better processability, ferrite graphite cast iron welding performance is better also. And heat treatment can make the mechanical properties of graphite cast iron over a wide range of change, in the case of the same microstructure, after heat treatment with graphite cast iron as-cast on some performance has obvious difference.








by means of gray cast iron, graphite cast iron, cast steel, the three kinds of materials for don't of, it is not hard to find: gray cast iron pneumatic valves used in hvac chilled water, cooling water and hot water, can fully meet the needs of the condition of pneumatic valve strength and toughness, and low cost. For the urban environment of high temperature hot water or steam heating, we should choose to do better in terms of strength and toughness of ink pneumatic valve, cast iron to adapt to the high temperature and high pressure of the medium. Pneumatic valves and cast steel is commonly used in steam pressure higher environmental temperature, such as steam temperature higher than 200 ℃.






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