What are the commonly used materials for oil pumps?

What are the commonly used materials for oil pumps?

A, cast iron

1, gray cast iron is one of the most commonly used cast iron, gb code for HT. Generally, the pump body, impeller, pump cover, suspension and so on of the oil pump are all made of this material, which is usually used in three grades: HT150, HT200 and HT250. HT150 is mostly used for non-major parts such as base and cushion plate, HT200 is mostly used for pump body, pump cover and suspension, and HT250 is mostly used for impeller, mouth ring and shaft sleeve. Countries on the expression of gray iron method is different, such as Japan code-named FC, Germany code-named GG, the United States for

2, nodular cast iron is a kind of cast iron with better comprehensive performance, national standard code for QT, used for high viscosity pump or heat preservation gear pump, because its mechanical properties are close to steel, and its casting performance, processing performance is better than steel, so it is usually used as a substitute for cast steel. The most commonly used brands are: QT450-10, QT500-7, QT600-3. Due to the limitation of casting and other reasons, the impeller of the current water pump adopts the material, especially the cutting open impeller is superior in cost performance. Ductile cast iron is represented by GGG in DIN standard, and by Ductile iron in The United States.

In addition, there are corrosion-resistant cast iron - high silicon cast iron, wear-resistant cast iron - white cast iron, high toughness cast iron - malleable cast iron, etc., because there are certain difficulties in processing, the products used are not much.

Second, the cast steel

Because the strength of cast steel turns high, usually when the pressure > 1.6mpa, the bearing parts are mostly cast steel, its national standard code is ZG, the most commonly used brand is ZG23 0-450. Japan and the United States usually use CS cast steel, high temperature oil pump is made of cast steel material.

 

Three, stainless steel

Stainless steel gear pump is most used for austenitic stainless steel, such as 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti and so on. In addition to hydrochloric acid, dilute sulfuric acid and other media, austenitic stainless steel is an excellent corrosion resistant material, is the most commonly used chemical pump corrosion resistant material. Japan and the United States usually use SS304, SS316, SS316L to express austenitic stainless steel. Martensitic stainless steel such as 2Cr13, 3Cr13, its mechanical properties are better than austenitic stainless steel, usually used as a pump shaft and shaft sleeve material, Japan and the United States of the corresponding code for SS420. In addition, high alloy stainless steel (no. 20 alloy) and duplex stainless steel are also ideal corrosion resistant materials.

Carbon structural steel

It is usually divided into ordinary carbon structural steel and high quality carbon structural steel. The most representative common carbon structural steel is Q235, which is used for all kinds of steel plates and sections. The most representative of the high quality carbon steel is No. 45 steel, which is widely used in non-corrosion pump shaft materials.

Alloy steel

The most representative alloy steel is 40Cr, usually used in YCB gear pump gear material.

 

6. Non-metallic materials

Pump non-metallic materials are mainly used for sealing, such as polytetrafluoroethylene, fluorine rubber, nitrile rubber, etc. Polytetrafluoroethylene because of excellent corrosion resistance, high temperature performance and used for chemical pump gasket and mechanical seal static seal, suitable for almost all chemical media in 250℃, its disadvantage is high hardness, difficult assembly.

Fluorine rubber is also a good temperature and corrosion resistant material. The temperature limit is 160℃. When the user has no special requirements, it is recommended to use the sealing ring of the material for centrifugal oil pump. And nitrile rubber is mainly used for oil resistance or water medium static seal

 

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