Pump material type introduction

Pump material type introduction

First, cast iron

1, gray cast iron is the most commonly used cast iron, the national standard code for HT. The pump body, impeller, pump cover, and suspension of the general clean water pump are all made of this material, and three kinds of brands are commonly used: HT150, HT200, and HT250. For the non-main parts such as the base and the backing plate, the HT150 is mostly used, and the pump body, the pump cover, the suspension, etc. are mostly made of HT200, and the impeller, the ring, and the bushing are mostly HT250.

Different countries have different methods for expressing grey iron, such as Japan's code name is FC, Germany's code name is GG, and the United States is Class.

2. Ductile iron is a kind of cast iron with good comprehensive performance. The national standard code is QT. Because its mechanical properties are close to that of steel, its forgeability and processing performance are superior to steel, so it is usually used as a replacement for cast steel. The most commonly used grades are: QT450-10, QT500-7, QT600-3. Due to restrictions on reasons such as forging, the company currently does not make this material.

The representation of ductile iron on the DIN scale is GGG, and that of the United States is Ductile iron.

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 and so on.

Second, cast steel

Because the strength of cast steel turns high, usually when the pressure> 1.6Mpa, the pressure parts are mostly cast steel, the national standard code is ZG, the most commonly used brand name is ZG230-450.

Japan and the United States usually use CS to represent cast steel.

Three, stainless steel

The most widely used stainless steels are austenitic stainless steels, such as 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc. In addition to hydrochloric acid, dilute sulfuric acid and other minority media, austenitic stainless steel is an excellent corrosion resistant material and is the most commonly used corrosion resistant material for chemical pumps. Japan and the United States usually use SS304, SS316, SS316L to represent austenitic stainless steel.

Martensitic stainless steels such as 2Cr13 and 3Cr13 have better mechanical properties than austenitic stainless steels and are commonly used as materials for pump shafts and bushings. The corresponding codes for Japan and the United States are SS420.

In addition, high alloy stainless steel (20 alloy) and double stainless steel are also ideal erosion resistant materials.

Fourth, carbon structural steel

Usually divided into ordinary carbon structural steel and high quality carbon structural steel.

The most representative common carbon structural steel is Q235, which is commonly used for all kinds of steel plates and shaped steels. The most representative high-quality carbon steel is No. 45 steel, which is widely used for pump shaft materials when no erosion is required.

Fifth, alloy steel

The most representative alloy steel is 40Cr, which is commonly used for high-strength pump shafts.

Six, non-metallic materials

Pump non-metallic materials are mainly used for sealing, such as PTFE, fluorine rubber, nitrile rubber and so on. Among them, PTFE is used in chemical pump seals and static seals for mechanical seals due to its excellent corrosion resistance and high temperature resistance. It is used in almost all chemical media at 250°C. Its disadvantage is high hardness and difficulty in assembly. Big.

Fluoroelastomer is also a good material for temperature resistance and corrosion resistance. The upper limit of temperature is 160°C. When the user does not have special requirements, the company's chemical pump adopts the sealing ring of the material; and nitrile rubber is mainly used for oil resistance. Or static seal when the water purification medium.