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2022
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What are the common materials for valve bodies?
Valve body common material 1: Gray cast iron is a type of cast iron. Carbon exists in the form of flake graphite in cast iron. The fracture is gray. It has good casting and cutting performance and good wear resistance. Used to manufacture frames, boxes, etc.
Common materials for valve bodies 1: Gray cast iron
Gray cast iron is a type of cast iron. Carbon exists in the form of flake graphite in cast iron. The fracture is gray. It has good casting and cutting performance and good wear resistance. It is used to manufacture frames, boxes, etc. The graphite in gray cast iron is flaky, the effective bearing area is relatively small, and stress concentration is prone to occur at the graphite tips, so the strength, plasticity, and toughness of gray cast iron are lower than those of other cast irons. However, it has excellent vibration damping performance, low notch sensitivity, and high wear resistance. It is suitable for low-pressure valve bodies with working temperatures between -15~+200℃ and nominal pressure PN≤ 1.6Mpa.
Common materials for valve bodies 2: Black heart malleable cast iron
Black heart malleable cast iron refers to parts with a certain impact force and good strength, suitable for working under medium or static loads. Black heart malleable cast iron has high toughness and good comprehensive performance. Malleable cast iron is obtained by malleablizing annealing of cast iron. The malleablizing annealing time is very long. Adding a certain amount of alloy can shorten the malleablizing annealing time. The cast iron billet is heat-treated in a sealed annealing furnace. When annealing under neutral furnace gas conditions, flocculent graphite exists in the cast iron structure. Although this graphite is not very round and dense, its splitting effect on the matrix is much smaller than that of flake graphite in gray cast iron, so cast iron can obtain higher strength and good toughness. It is suitable for medium and low-pressure valve bodies with working temperatures between -15~+250℃ and nominal pressure PN≤ 2.5MPa.
Common materials for valve bodies 3: Ductile iron
Ductile iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. Due to its excellent performance, it has been successfully used to cast some parts with complex stress and high requirements for strength, toughness, and wear resistance. Ductile iron has rapidly developed into a widely used cast iron material second only to gray cast iron. The so-called 'replacing steel with iron' mainly refers to ductile iron.
Ductile iron obtains spherical graphite after spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially plasticity and toughness, thereby obtaining higher strength than carbon steel. It is suitable for medium and low-pressure valve bodies with working temperatures between -30~+350℃ and nominal pressure PN≤ 4.0Mpa.
Common materials for valve bodies 4: Carbon steel
Carbon steel is an iron-carbon alloy with a carbon content of 0.0218%~2.11%. Also known as carbon steel. Generally, it also contains a small amount of silicon, manganese, sulfur, and phosphorus. Generally speaking, the higher the carbon content in carbon steel, the higher the hardness and strength, but the lower the plasticity. It is suitable for medium and high-pressure valve bodies with working temperatures between -29~+425℃, where 16Mn and 30mn are used to replace astma105 with working temperatures between -40~+450℃.
Common materials for valve bodies 5: Low-temperature carbon steel
Low-temperature steel refers to alloy steel suitable for applications below 0℃. Steel that can be used below -196℃ is called low-temperature steel or ultra-low-temperature steel. It is suitable for low-temperature valve bodies with working temperatures between -46~+345℃.
Common materials for valve bodies 6: Alloy steel (wc6, wc9)
In addition to iron and carbon, alloy steel also adds other alloying elements, so it is called alloy steel. An iron-carbon alloy formed by adding an appropriate amount of one or more alloying elements on the basis of ordinary carbon steel. According to different added elements and appropriate processing technology, special properties such as high strength, high toughness, wear resistance, corrosion resistance, low-temperature resistance, high-temperature resistance, and non-magnetism can be obtained.
Valve body
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