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Help CenterSteel Pipe & Tube & Precision Steel Pipe，GB/T 3639-2021、DIN 2391-2、ASTM A519、GB/T 699
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Steel Pipe & Tube & Precision Steel Pipe，GB/T 3639-2021、DIN 2391-2、ASTM A519、GB/T 699NegotiableMOQ: 5 Metric Tons -
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Precision Steel Pipe Product Detailed Description
Precision steel pipe is a high dimensional accuracy and high surface finish seamless pipe refined by cold drawing or cold rolling. It has no oxide layer on inner and outer walls, pressure resistance without leakage, and no deformation under cold bending. It is manufactured in accordance with the national standard GB/T 3639-2021, widely used in hydraulic systems, precision machinery, aerospace and other high-end fields.
1. Definition & Implementation Standards
1. Definition
Precision steel pipe (also known as precision bright pipe): made of high-quality carbon steel, alloy steel or stainless steel. It is refined through cold drawing / cold rolling + oxygen-free annealing. Its dimensional tolerance, wall thickness uniformity and surface finish are far better than ordinary seamless steel pipes, which can be directly used for precision assembly and high-pressure working conditions.
2. Main Implementation Standards
National Standard: GB/T 3639-2021 (Cold Drawn or Cold Rolled Precision Seamless Steel Pipe), GB/T 8713 (Special for Hydraulic and Pneumatic Systems).
International Standard: DIN 2391-2 (European Standard), ASTM A519 (American Standard).
Material Standard: GB/T 699 (High-quality Carbon Steel), GB/T 3077 (Alloy Steel).
2. Main Materials & Chemical Composition
| Material Grade | Chemical Composition | Characteristics & Applications |
|---|---|---|
| 20# Carbon Steel | C:0.17-0.24, Si:0.17-0.37, Mn:0.35-0.65, S≤0.035, P≤0.035 | Easy processing, used for hydraulic pipes, cylinder barrels and mechanical parts |
| 45# Carbon Steel | C:0.42-0.50, Si:0.17-0.37, Mn:0.50-0.80, S≤0.035, P≤0.035 | High strength and wear resistance, used for shaft parts, gears and structural components |
| 20CrMo Alloy Steel | C:0.17-0.23, Si:0.17-0.37, Mn:0.90-1.20, Cr:0.80-1.10 | High pressure and fatigue resistance, applied in auto parts and high-pressure pipelines |
3. Specification & Precision Grade
1. Conventional Size Range
Outer Diameter: 4mm–219mm
Wall Thickness: 0.5mm–20mm
Length: 3m–6m fixed length, customized length available
2. Precision Grade
| Precision Grade | OD Tolerance | Wall Thickness Tolerance | Straightness | Ovality | Surface Roughness Ra |
|---|---|---|---|---|---|
| Standard Grade | ±0.10~±0.20mm | ±10% | ≤0.3mm/m | ≤0.05mm | ≤0.8μm |
| High Precision Grade | ±0.05~±0.10mm | ±5% | ≤0.1mm/m | ≤0.01mm | ≤0.4μm |
4. Manufacturing Process
Raw material preparation and defect detection
Hot rolling and piercing into rough pipe
Precision forming by cold drawing or cold rolling
Oxygen-free annealing to eliminate internal stress
Straightening, polishing, flaw detection, fixed length cutting
Rust-proof treatment and finished product packaging
5. Product Advantages
High dimensional accuracy with strong interchangeability
Smooth inner and outer wall without oxide scale and scratches
Stable mechanical property, good cold bending, flaring and flattening performance
High pressure resistance, no leakage for hydraulic and pneumatic systems
Excellent corrosion resistance, long service life
6. Application Fields
Hydraulic & Pneumatic System: Oil cylinder, air cylinder, high-pressure pipeline
Precision Machinery: Bearing sleeve, roller shaft, mechanical structural parts
Automobile Industry: Shock absorber cylinder, fuel pipe, transmission parts
Aerospace: Precision hydraulic pipeline and structural parts
Medical & Food Industry: Sanitary stainless steel pipeline
Other fields: Precision instruments, high-pressure boiler, chemical equipment
7. Packaging, Marking & Delivery
Packaging: Bundled with plastic cap protection at both ends, anti-rust oil and moisture-proof film; export fumigated wooden box available.
Marking: Marked with standard, material, specification, batch number and manufacturer information.
Delivery Time: Conventional specifications 5-7 working days.
8. Quality Inspection
Full size inspection by professional testing equipment
Visual and internal surface defect inspection
Mechanical property test: tensile, hardness, cold bending test
Non-destructive testing: Eddy current and ultrasonic flaw detection
Chemical composition spectral analysis with official quality certificate
9. Difference Between Precision Steel Pipe and Ordinary Seamless Pipe
| Item | Precision Steel Pipe | Ordinary Seamless Steel Pipe |
|---|---|---|
| OD Tolerance | ±0.05~±0.20mm | Above ±0.50mm |
| Wall Thickness Tolerance | ±5%~±10% | Above ±12.5% |
| Surface Finish | High brightness, no oxide layer | Rough surface with obvious oxide scale |
| Straightness | ≤0.1mm/m | ≤1.0mm/m |
| Application | High pressure & precision assembly | Ordinary structural engineering |
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