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Help CenterSteel Pipe & Tube & Precision Steel Pipe，ASTM A519、ASTM B881、DIN 2391、GB/T 3639-2009、GB/T 8162-2018、GB/T 8163-2018
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Precision Steel Tube – Detailed Product Description
1. Product Definition
Precision steel tubes are high-dimensional-tolerance and high-surface-finish seamless steel pipes manufactured by Cold Drawing or Cold Rolling process. There is no oxide layer on the inner and outer walls, with dimensional tolerance up to ±0.05mm and surface roughness Ra≤0.8μm, far superior to ordinary seamless steel tubes.
2. Main Materials & Chemical Composition
Common grades available with customized options:
Carbon Steel
10# / 20#: Good toughness and weldability, widely used for hydraulic cylinders and general mechanical structures.
35# / 45#: High structural strength (Tensile strength ≥ 600MPa), suitable for shafts, gears and high-strength structural parts.
Alloy Steel
40Cr / 42CrMo: Excellent wear resistance and impact resistance with stable quenching and tempering performance; applied to high-pressure equipment, automobile transmission shafts and mold parts.
16Mn (Q345B): Low-alloy high-strength steel, used for engineering machinery and pressure vessels.
3. Specification Parameters & Tolerance
Outer Diameter (OD): 4mm–120mm (regular range), maximum up to 6mm–200mm
Wall Thickness (WT): 0.5mm–30mm, regular size 1.5mm–17mm
Length: Standard 6m–12m; custom fixed length 300mm–6000mm, cutting and chamfering available
Dimensional Precision: Outer diameter tolerance ±0.05mm; wall thickness deviation ±8%~±12%
Surface Finish: Inner wall roughness Ra≤0.4μm–0.8μm (mirror level)
Delivery Condition: Annealed, Bright Cold Finished
4. Implementation Standards
Chinese GB Standard: GB/T 3639-2009, GB/T 8162-2018, GB/T 8163-2018
European Standard: DIN 2391
American Standard: ASTM A519, ASTM B881
5. Key Features
High Precision: Micron-level tolerance for perfect assembly without secondary processing.
Superior Surface Finish: Oxide-free inner and outer walls, directly applicable to hydraulic systems with leakage prevention and low friction.
Excellent Mechanical Properties: Cold working hardening increases strength by 20%–30%; qualified in cold bending, flaring and flattening without crack or deformation; high pressure resistance.
High Material Utilization: Save 15%–30% steel consumption and reduce processing time and cost compared with ordinary steel pipes.
Good Surface Protection: Treated with anti-rust oil and pickling passivation for strong corrosion resistance and long service life.
6. Main Application Fields
Hydraulic & Pneumatic System: Cylinder barrel, air cylinder barrel, high-pressure oil pipeline
Automotive Industry: Steering sleeve, shock absorber pipe, transmission shaft, brake pipeline
Precision Machinery: Machine tool spindle, bearing sleeve, gear shaft, precision instrument parts
Energy & Chemical Industry: Boiler tube, heat exchanger tube, oil and gas transportation pipeline, anti-corrosion pipeline
Aerospace Industry: Engine components, fuel pipeline, navigation support parts
7. Production Process
Pipe Billet → Hot Rolling Piercing → Pickling → Cold Drawing / Cold Rolling → Vacuum Annealing → Sizing & Straightening → Flaw Detection → Inspection → Packaging & Warehousing
8. Packaging & Delivery
Packing: Soaked with anti-rust oil; bundled 50–100 pieces per bundle or packed in wooden cases to avoid collision and rust.
Delivery Time: 5–7 working days for regular specifications; negotiable for special sizes.
Shipping Port: Tianjin Port, Qingdao Port (FOB / CIF terms acceptable)
Quality Certificate: Mill Test Certificate (MTC), dimension inspection report, mechanical property report and non-destructive testing report can be provided.
9. Selection Guide
Material Matching: Choose 20#/45# for general structure; 40Cr/42CrMo for high pressure and wear resistance; 304/316L for corrosive environment.
Precision Grade: Ra≤0.4μm and ±0.05mm tolerance for hydraulic system; Ra≤0.8μm for general machinery.
Size Specification: Custom outer diameter, wall thickness and length according to design to reduce waste.
Executive Standard: Prioritize GB/T 3639-2009; DIN 2391 or ASTM standard for export business.
Common Specification Reference
| Outer Diameter (mm) | Wall Thickness (mm) | Material | Application |
|---|---|---|---|
| 10–20 | 1.5–3.0 | 20# | Air cylinder, small caliber oil pipe |
| 20–40 | 2.0–5.0 | 45# | Shaft parts, gears, mechanical structure |
| 40–80 | 3.0–8.0 | 40Cr | High-pressure oil cylinder, auto parts |
| 80–120 | 5.0–15.0 | 16Mn | Pressure vessel, engineering machinery |
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