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Help CenterPrecision Steel Tube & Steel Pipe & Tube，10#、20#、35#、45#、20Cr、40Cr、20CrMo、42CrMo、16Mn、27SiMn
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Precision Steel Tube & Steel Pipe & Tube，10#、20#、35#、45#、20Cr、40Cr、20CrMo、42CrMo、16Mn、27SiMnNegotiableMOQ: 5 Metric Tons -
Precision Steel Tube & Steel Pipe & Tube，10#、20#、35#、45#、20Cr、40Cr、20CrMo、42CrMo、16Mn、27SiMnNegotiableMOQ: 5 Metric Tons
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Precision Steel Tube & Steel Pipe & Tube，10#、20#、35#、45#、20Cr、40Cr、20CrMo、42CrMo、16Mn、27SiMnNegotiableMOQ: 5 Metric Tons
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Precision Steel Tube & Steel Pipe & Tube，10#、20#、35#、45#、20Cr、40Cr、20CrMo、42CrMo、16Mn、27SiMnNegotiableMOQ: 5 Metric Tons
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Precision Steel Tube & Steel Pipe & Tube，10#、20#、35#、45#、20Cr、40Cr、20CrMo、42CrMo、16Mn、27SiMnNegotiableMOQ: 5 Metric Tons
1. Product Definition
Precision tubes are high-precision and high-brightness seamless steel tubes manufactured through cold drawing / cold rolling processes. Made from hot-rolled seamless steel tubes or continuous casting billets via multiple cold working, heat treatment and finishing procedures, they feature far superior dimensional accuracy and surface quality compared with ordinary seamless tubes. Their core advantages include ultra-tight tolerance, smooth inner wall and uniform mechanical properties.
2. Manufacturing Process
1. Raw Material: High-quality hot-rolled seamless steel tubes or continuous casting billets are adopted as raw materials.
2. Cold Working: Multi-pass cold rolling or cold drawing to gradually reduce diameter and wall thickness and improve dimensional accuracy.
3. Heat Treatment: Bright annealing under protective atmosphere to eliminate internal stress and restore toughness.
4. Finishing: Straightening, non-destructive testing (UT/ET), precision cleaning and polishing.
5. Packaging: Moisture-proof and sealed packaging to prevent rusting and collision damage during transportation.
3. Material and Specifications
3.1 Common Materials
- Carbon Steel: 10#, 20#, 35#, 45# (cost-effective, widely used for structural and hydraulic applications).
- Alloy Steel: 20Cr, 40Cr, 20CrMo, 42CrMo, 16Mn, 27SiMn (high strength and wear resistance).
3.2 Dimension Range
- Outer Diameter: 3–219mm (standard), customized large diameter up to 325mm.
- Wall Thickness: 1–20mm, customized thin and thick walls available.
- Length: Standard 6–7m, fixed length customization from 3–12m.
3.3 Precision Grades (GB/T 3639)
Grade |
Outer Diameter Tolerance |
Wall Thickness Tolerance |
Application Scenarios |
Standard Grade |
±0.50mm |
±10% |
General structure and fluid transmission |
High Grade |
±0.30mm |
±8% |
Mechanical processing and automotive parts |
Premium Grade |
±0.20mm |
±5% |
Precision machinery and hydraulic systems |
Ultra-Precision Grade |
±0.10mm |
±3% |
Aerospace and precision instruments |
3.4 Surface Quality
- Roughness: Ra≤0.8μm (bright tube), high-end products reach Ra≤0.2μm.
- Appearance: Free of oxide scale, cracks, scratches and scabs; clean inner and outer walls for direct assembly.
4. Executive Standards
- GB/T 3639-2021: Cold drawn or cold rolled precision seamless steel tubes (general).
- GB/T 8713: Precision seamless steel tubes for hydraulic and pneumatic cylinder barrels.
- DIN 2391: German standard for precision seamless steel tubes.
- EN 10204: 3.1/3.2 material certification (required for high-end orders).
5. Mechanical Properties (Typical Values)
- Tensile Strength: 550–800MPa (adjustable according to material and process).
- Yield Strength: ≥330MPa (20# steel), ≥510MPa (20CrMo).
- Elongation: ≥20% (ensures good plasticity).
- Hardness: HB 180–280 (adjustable on demand).
6. Core Features
1. Ultra-high Precision: Minimum outer diameter tolerance of ±0.05mm and wall thickness tolerance of ±3%, with micron-level dimensional control.
2. Excellent Surface Condition: Smooth inner and outer walls without oxide scale, available for direct electroplating, painting and assembly without secondary processing.
3. Stable Performance: Cold working improves structural strength, while heat treatment eliminates internal stress, delivering uniform structure, excellent fatigue resistance and impact resistance.
4. Lightweight Design: Lighter than ordinary steel tubes under the same strength, reducing material and overall costs.
5. High Customization: Custom processing including special-shaped sections, inner hole plating and special heat treatment to meet diverse application requirements.
7. Application Fields
- Hydraulic System: Used for high-pressure oil cylinders, air cylinders and hydraulic pipelines, featuring pressure resistance, zero leakage and over 30% longer service life.
- Mechanical Manufacturing: Applied to precision shaft sleeves, gear shafts, transmission parts and machine tool spindles for stable operation and high precision.
- Automotive Industry: Suitable for transmission shafts, steering tubes, shock absorber parts and engine components with lightweight and high-strength properties.
- Aerospace Industry: Used for lightweight structural parts, conduits and instrument tubes, adapting to high-temperature, high-pressure and corrosive working environments.
- Energy and Chemical Industry: Applied to high-pressure boiler tubes, heat exchanger tubes and corrosion-resistant pipelines with high temperature and acid-base resistance.
8. Weight Calculation Formula
Weight per meter (kg) = (Outer Diameter − Wall Thickness) × Wall Thickness × 0.02466
9. Delivery Status
- Cold Hard (BK): No heat treatment after cold working, featuring high hardness and low plasticity, suitable for minor deformation processing.
- Annealed (GBK): Protected atmosphere annealing to eliminate internal stress, provide good plasticity and easy processing performance.
- Normalized (NBK): Optimized metal structure with excellent machinability, ideal for mechanical processing parts.
10. Packaging and Marking
- Packaging: Wrapped with moisture-proof and rust-proof film and woven bags / wooden cases, with plastic end caps for pipe sealing.
- Marking: Each tube is printed with specifications, material, standard, batch number and manufacturer information, accompanied by official quality certificates.
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