What are the materials of the pump
1. Cast iron
(1) Gray cast iron
Gray cast iron is a frequently used cast iron. Generally, the pump body, pump cover, suspension, impeller, etc. are all cast from gray cast iron. These three grades of cast iron are often used: HT150/ HT200/HT250, pump base, backing plate and other non-main parts are mostly gray cast iron of HT150 brand, pump body, pump cover, suspension, etc. are mostly 3 cast iron of HT200 brand, impeller, mouth ring, shaft Most of the sleeves, bearings as sleeves, etc. are made of HT250 gray cast iron. (National standard code HT)
(2) Nodular cast iron
Nodular cast iron is a kind of cast iron with better comprehensive functions. Its mechanical performance is close to steel. At the same time, the forging and processing functions are better than steel. Therefore, nodular cast iron is usually used as a replacement for cast steel. Kinds of grades: QT450-10, QT500-7, QT600-3, (national standard code QT)
In addition, there are corrosion-resistant cast iron, high-silicon cast iron, wear-resistant cast iron, white cast iron, and high-toughness cast iron, all of which can be forged cast iron.
2. Cast steel
(1) The strength of cast steel becomes higher. Generally, when the pressure is greater than 1.6Mpa, most of the pressure-bearing parts are made of cast steel. The brand often used for cast steel is ZG230-450, (national standard code ZG)
3. Stainless steel
(1) The most widely used stainless steel is austenitic stainless steel, such as 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc. Except for a few media such as hydrochloric acid and dilute sulfuric acid, austenitic stainless steel is an excellent corrosion-resistant material and the most commonly used corrosion-resistant material for chemical pumps.
Martensitic stainless steels such as 2Cr13 and 3Cr13 have better mechanical properties than austenitic stainless steels. They are usually used as materials for pump shafts and sleeves. The corresponding codes in Japan and the United States are SS420.
4. Carbon structural steel
(1) Carbon structural steel is generally divided into ordinary carbon structural steel and high-quality carbon structural steel. The most representative ordinary carbon structural steel is Q235, and many steel plates and section steels use this material. The most representative high-quality carbon steel is No. 45 steel, which is widely used for pump shafts without corrosion-free requirements. Material.
5. Alloy
Alloy steel grade 40Cr is a material often used for high-strength pump shafts.
6. Non-metallic materials
The non-metallic materials used in water pumps are mainly suitable for sealing, such as tetrafluoroethylene, fluorine rubber, nitrile rubber, etc. Among them, polytetrafluoroethylene has excellent corrosion resistance and high temperature resistance and is used for chemical pump gaskets and static seals of mechanical seals. It is suitable for almost all chemical media within 250°C. Its disadvantages are high hardness and difficulty in assembly. big.
Fluorine rubber is also a kind of better temperature resistance and corrosion resistance material. The upper limit of temperature resistance is 160℃. When the user has no special requirements, the company’s chemical pumps use this material for sealing rings; while nitrile rubber is mainly used for oil resistance. Or static sealing for water purification media.
Post time: 2022-01-06
