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Pump material type introduction A, cast iron 1, gray cast iron is the most commonly used cast iron, GB code-named HT. General net water pump body, impeller, pump cover, suspension, etc. are used in the material, usually used in three brands: HT150, HT200, HT250. For the base, pad and other non-major parts to use more HT150, pump, pump cover, suspension and more use of HT200, and impeller, mouth ring, sleeve and more use HT250. Different countries on the gray iron, said the method is different, such as Japan's code-named FC, Germany's code-named GG, the United States as Class. 2, ductile iron is a better overall performance of cast iron, the national standard code-named QT. Because of its mechanical function close to steel, at the same time its forging function, processing machine superior to steel, so it is often used as a cast steel replacement. The most commonly used grades are: QT450-10, QT500-7, QT600-3. Due to the forging and other reasons, the company temporarily do not do the material. DIN scale ductile iron that GGG, the United States said Ductile iron. In addition there are decayed cast iron - high silicon cast iron, wear-resistant cast iron - white cast iron, high toughness cast iron - malleable iron. Second, the cast steel because of the strength of cast steel, usually when the pressure> 1.6Mpa, pressure parts and more use of cast steel, the national standard code-named ZG, the most commonly used grades ZG230-450. Japan and the United States usually use CS for cast steel. Third, stainless steel is the most widely used stainless steel austenitic stainless steel, such as 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti and so on. In addition to hydrochloric acid, dilute sulfuric acid and a few other media, austenitic stainless steel is excellent erosion-resistant materials, chemical pumps are the most commonly used anti-corrosion materials. Japan and the United States usually use SS304, SS316, SS316L to represent austenitic stainless steel. Martensitic stainless steel such as 2Cr13, 3Cr13, its mechanical properties better than austenitic stainless steel, usually used as a pump shaft and sleeve material, Japan and the United States corresponding code-named SS420. In addition, high alloy stainless steel (alloy No. 20) and duplex stainless steel are also ideal erosion resistant materials. Fourth, carbon structural steel is usually divided into ordinary carbon structural steel and high-quality carbon structural steel. The most representative ordinary carbon structural steel Q235, all kinds of steel, steel and more use of the material; the most representative of high-quality carbon steel 45 steel, which is widely used in non-erosion requirements of the pump shaft material. Fifth, the most representative alloy steel 40Cr, usually used for high-strength pump shaft material. Six, non-metallic materials Pumps are mainly used for non-metallic materials sealed, such as PTFE, Viton, NBR and so on. PTFE which has excellent corrosion resistance, high temperature performance for chemical pump seals and mechanical seal static seal, combined for almost all of the chemical medium at 250 ℃, the disadvantage is the higher hardness, the difficulty of assembly Big. Fluoroelastomer is also a good temperature, erosion-resistant materials, temperature limit is appropriate to 160 ℃, when the user without special requirements, the company chemical pumps are used in the seal material; and nitrile rubber is mainly used for oil Or static seal when the water medium.