Precision Seamless Steel Tubes For Hydraulic And Pneumatic Cylinders
Precision inner diameter seamless steel tubes for hydraulic and pneumatic cylinders are high-precision tubes designed to meet the stringent requirements of hydraulic and pneumatic systems. These tubes are manufactured to close dimensional tolerances and are used as the primary components in the construction of cylinders that convert fluid pressure into linear motion. The seamless structure ensures the tubes have high pressure resistance and structural integrity, which is critical for the performance and safety of hydraulic and pneumatic systems.
Applications:
- Hydraulic Cylinders: Used in various hydraulic systems for machinery and equipment that require precise control of force and movement.
- Pneumatic Cylinders: Employed in pneumatic systems for applications needing clean, reliable, and energy-efficient linear motion.
- Industrial Machinery: Commonly used in industrial machinery for automation and process control.
- Construction Equipment: Utilized in heavy machinery for earthmoving, lifting, and other construction-related tasks.
- Automotive Industry: Found in various automotive applications, including braking systems and power steering.
Functions:
- Pressure Containment: Serve as a pressure-resistant barrier to contain hydraulic fluid or air pressure.
- Linear Actuation: Convert pressure into linear motion to drive pistons and rams in cylinders.
- Load Support: Support and lift heavy loads in various mechanical systems.
- Precision Movement: Provide smooth and precise linear movement for controlled applications.
- Durability: Offer long service life with resistance to wear and corrosion under pressure.
Key Features:
- High-Precision Dimensions: Close tolerances on inner diameter, outer diameter, and wall thickness.
- Seamless Construction: No welds to ensure uniform material properties and eliminate potential points of failure.
- Chemical Composition: Designed with specific chemical compositions to achieve desired mechanical properties.
- Mechanical Properties: Exhibit high tensile strength, yield strength, and elongation to withstand operational loads.
- Surface Finish: Smooth inner and outer surfaces to reduce friction and enhance cylinder performance.
Standard for Precision Inner Diameter Seamless Steel Tubes for Hydraulic and Pneumatic Cylinders:
Aspect | Description |
Standard | Q/BQB 264—2018 31, GB/T 8713-1988 (Superseded) 34, GB/T 32957-2016 40 |
Grade | Typically carbon steel grades such as 10, 20, and alloy steel grades like 45Mn, 27SiMn, and others suitable for hydraulic cylinder applications |
Chemical Composition:
Element | Typical Range (%) |
Carbon (C) | 0.07-0.50 depending on the grade |
Manganese (Mn) | 0.20-1.60 depending on the grade |
Silicon (Si) | Generally up to 0.60 |
Phosphorus (P) | Typically ≤0.035 |
Sulfur (S) | Typically ≤0.035 |
Mechanical Properties:
Property | Typical Range |
Tensile Strength (MPa) | 410-1100 depending on the grade |
Yield Strength (MPa) | 205-980 depending on the grade |
Elongation (%) | ≥10% (for most grades) |
Hardness | Varies based on heat treatment |


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