The material of hydraulic cylinder can be selected according to the pressure of working medium and the size of working cylinder. The selection range is very wide. For low-pressure and small-size hydraulic cylinders, gray cast iron can be used, which is commonly used between HT200 and HT350. If the requirements are higher, nodular cast iron QT450-10, QT500-7 and QT600-3 can be used. Cast steel can be used for higher requirements, such as ZG230-450, ZG270-500, ZG310-570, etc. For large and medium forging hydraulic presses, 35 or 40 forged steel is commonly used, and sometimes low alloy steel such as 20MnMo is used to manufacture hydraulic cylinders. In some large-tonnage forging or die forging hydraulic presses, the material of hydraulic cylinders is sometimes 18MnMoNb alloy steel, which is directly forged into the blank of hydraulic cylinders with large steel ingots.

Small-sized hydraulic cylinders also use seamless steel tubes as bad materials, with small machining allowance, good technological performance and short production preparation period, which is suitable for large-scale production.

The material of standard hydraulic cylinder steel pipe is carbon steel for mechanical construction, marked STKM13C. After seamless cold drawing on the surface and high-precision cross boring on the inner diameter, the inner diameter tolerance is H7~H9, the surface roughness is 0. 8~3. 0S, and the tensile strength is above 5. 2MPa. Steel pipe thickness pressure calculation:

T= (PxD) /200xSt: wall thickness (mm)P: maximum working pressure (kg force) D: inner diameter of steel pipe (mm) S: minimum tensile strength/5 safety factor

7. The piston rod is made of carbon steel for mechanical construction, marked S45C. After grinding and hard chrome plating, the outer tolerance is f7~f8, and the surface hardness is over HV700. The surface roughness is 0. 8~1. 6S, and the hard chromium thickness is 20 microns.

In addition: (1) according to the strength requirement, the yield point of quenching can reach more than 50Kg. (2) Material SCM440(H): The quenching yield point can reach above 8. 5MPa.

8. Oil seals are made of imported high-grade refined products, which are oil-resistant, corrosion-resistant, wear-resistant and pressure-resistant.

9. All spare parts have been precisely processed by CNC lathes and CNC milling machines, and the dimensional tolerance conforms to JIS standards, with good interchangeability, long service life and easy maintenance.

10. inductive hydraulic cylinder, the cylinder tube material is SUS304, because it has no magnetic induction, so the magnetic induction switch installed outside the stainless steel tube can have magnetic induction effect with the magnet installed on the piston. Therefore, it can be used to detect the forward and backward position of hydraulic cylinder.

Material selection of hydraulic cylinder

The material of hydraulic cylinder can be selected according to the pressure of working medium and the size of working cylinder. The selection range is very wide. For low-pressure and small-size hydraulic cylinders, gray cast iron can be used, which is commonly used between HT200 and HT350. If the requirements are higher, nodular cast iron QT450-10, QT500-7 and QT600-3 can be used. Cast steel can be used for higher requirements, such as ZG230-450, ZG270-500, ZG310-570, etc. For large and medium forging hydraulic presses, 35 or 40 forged steel is commonly used, and sometimes low alloy steel such as 20MnMo is used to manufacture hydraulic cylinders. In some large-tonnage forging or die forging hydraulic presses, the material of hydraulic cylinders is sometimes 18MnMoNb alloy steel, which is directly forged into the blank of hydraulic cylinders with large steel ingots. Small-sized hydraulic cylinders also use seamless steel tubes as bad materials, with small machining allowance, good technological performance and short production preparation period, which is suitable for large-scale production.