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Precision Steel Tube – Product Details
Precision tubes are high-precision pipes manufactured from high-quality carbon steel and alloy steel through cold drawing or cold rolling processes. Featuring high dimensional accuracy, excellent inner/outer surface finish, and stable mechanical properties, they are widely used in hydraulic & pneumatic systems, automotive manufacturing, engineering machinery, precision machinery, bearings, oil cylinders, and other industries. They can be directly assembled, greatly reducing processing procedures and improving assembly efficiency and product qualification rate.
1. Common Materials & Standards
20# Precision Tube
45# Precision Tube
16Mn Precision Tube
Q345B Precision Tube
20Cr Precision Tube
40Cr Precision Tube
Execution Standards: GB/T 8162, GB/T 8163, GB/T 3639, etc. Custom sizes (national standard & non-standard) are available per customer requirements.
2. Chemical Composition of Main Materials
| Grade | C (Carbon) | Si (Silicon) | Mn (Manganese) | P (Phosphorus) ≤ | S (Sulfur) ≤ | Cr (Chromium) |
|---|---|---|---|---|---|---|
| 20# | 0.17~0.24 | 0.17~0.37 | 0.35~0.65 | 0.035 | 0.035 | ≤0.25 |
| 45# | 0.42~0.50 | 0.17~0.37 | 0.50~0.80 | 0.035 | 0.035 | ≤0.25 |
| 16Mn (Q345B) | 0.12~0.20 | 0.20~0.60 | 1.20~1.60 | 0.035 | 0.035 | ≤0.30 |
| 20Cr | 0.18~0.24 | 0.17~0.37 | 0.50~0.80 | 0.035 | 0.035 | 0.70~1.00 |
| 40Cr | 0.37~0.44 | 0.17~0.37 | 0.50~0.80 | 0.035 | 0.035 | 0.80~1.10 |
3. Product Features
High Dimensional AccuracySmall tolerance of outer and inner diameters, uniform wall thickness, excellent roundness and straightness to meet precision assembly requirements.
High Surface FinishBright and smooth inner/outer surfaces without oxide scale, folds or burrs, suitable for direct use in precision components.
Excellent Mechanical PropertiesDense material structure, high strength, good toughness, fatigue resistance and high pressure resistance, suitable for high-frequency and heavy-duty working conditions.
Great MachinabilityCan be processed by cutting, bending, flaring, shrinking, honing, turning, etc., without cracking or deformation.
Cost-effectiveReduces machining allowance, lowers material waste and processing costs, and improves overall production efficiency.
4. Production Process
High-quality tube blank → Pickling & Phosphating → Cold Drawing / Cold Rolling → Annealing → Straightening → Finishing → Non-destructive Testing → Inspection & Warehousing
5. Size Range
Outer Diameter: Φ4mm ~ Φ120mm
Wall Thickness: 0.5mm ~ 20mm
Length: Normal random length; fixed length cutting available as required
Tolerance: Customizable for high-precision requirements
6. Applications
Hydraulic & Pneumatic Systems: Hydraulic pipes, cylinder tubes, oil cylinder barrels, high-pressure oil pipelines
Automotive Industry: Shock absorber tubes, drive shaft sleeves, fuel tubes, chassis precision pipes
Engineering Machinery: Hydraulic tubes for excavators/loaders, honed tubes, piston rod matching tubes
Precision Machinery: Bearing tubes, precision sleeves, textile machinery parts, instrument structural tubes
Others: Fitness equipment, furniture hardware, motor housings, mold parts, etc.
7. Quality Assurance
Raw materials are supplied by qualified steel mills with original material certificates and full traceability.
Full inspection during production: dimensional inspection, surface inspection, mechanical property testing.
Finished tubes pass eddy current testing and hydrostatic testing to eliminate defects such as cracks, sand holes and leakage.
Third-party inspection is supported. Factory inspection reports and quality certificates can be provided.
8. Packaging, Delivery & Lead Time
Packaging: Pipe end caps + moisture-proof packaging + woven bags / wooden cases to prevent scratches and rust during transportation.
Suitable for container transportation; export customs declaration support available.
Lead Time: Regular stock and custom orders: 5–7 days.
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