Product Overview：
Steel pipes for mechanical parts are one of the commonly used types of seamless steel pipes. Widely used in the manufacturing of mechanical parts and structural components, such as mechanical parts, automotive parts, bicycle frames, rolling bearing rings, jack sleeves, automotive ignition coils, etc. Currently, steel pipes are widely used to manufacture mechanical parts and components. According to the different cross-sectional shapes, it can be divided into circular pipes and irregular pipes. Due to the condition that the circumference is equal, the circular area is the largest, and the cross-section is subjected to internal or external radial pressure with relatively uniform force. Therefore, the vast majority of steel pipes used for mechanical parts are circular pipes.
| Product List |
| Product Name: | 10 # Steel pipe for mechanical parts | Seamless steel pipe |
| Product Name: | 20 # Steel Pipe for Mechanical Parts | Seamless Steel Pipe |
| Product Name: | 45 # Steel pipe for mechanical parts | Seamless steel pipe |
| Product Name: | Q235 steel pipe for mechanical parts | seamless steel pipe |
| Product Name: | Q345 steel pipe for mechanical parts | seamless steel pipe |
| Product Name: | 16Mn steel pipe for mechanical parts | Seamless steel pipe |
| Product Name: | 40Cr steel pipe for mechanical parts | seamless steel pipe |
| Product Name: | 27SiMn steel pipe for mechanical parts | seamless steel pipe |
| Product Name: | 12Cr1MoV steel pipe for mechanical parts | seamless steel pipe |
| Product Name: | 15CrMo steel pipe for mechanical parts | Seamless steel pipe |
| Product Name: | GB3088 Seamless steel pipe for automotive half shaft sleeve pipe |
| Product Name: | Special steel pipe for industrial accessories | Seamless steel pipe |
| Parameter range |
| Outer diameter | Φ6mm‑Φ219mm， Can undertake customized non-standard outer diameters |
| Wall thickness | 0.5mm‑20mm |
| Standard length | 1‑12m， Customizable short and extended non ruler |
| Outer diameter accuracy | Maximum ± 0.03mm |
| Executive Standards | EN 10305-1, ASTM A519, DIN 2391, JIS G3445, GB/T 3639 |
| Non-standard customization | Special wall thickness, honing inner holes, and pressure deep processing can all be customized |
| Small caliber precision tube Φ 6-25 (sleeve, small shaft sleeve, connecting rod) |
| Outer diameter (mm) | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22
| 25 |
Common wall thickness (mm) | 1.0，1.5，2.0 | 1.0，1.5，2.0，2.5 | 1.0，1.5，2.0，2.5，3.0 | 1.5，2.0，2.5，3.0，4.0 | 1.5，2.0，2.5，3.0，4.0 | 1.5，2.0，2.5，3.0，4.0，5.0 | 2.0，2.5，3.0，4.0，5.0 | 2.0，2.5，3.0，3.5，4.0，5.0 | 2.0，2.5，3.0，4.0，5.0，6.0 | 2.0，2.5，3.0，4.0，5.0，6.0，7.0 |
| Medium caliber precision tube Φ 28-60 (flange sleeve, oil cylinder blank, transmission sleeve) |
| Outer diameter (mm) | 28
| 30 | 32 | 35 | 38 | 40 | 42 | 45 | 48 | 50 |
| Common wall thickness (mm) | 2.5，3.0，4.0，5.0，6.0，7.0 | 2.5，3.0，4.0，5.0，6.0，8.0 | 3.0，4.0，5.0，6.0，8.0，10 | 3.0，4.0，5.0，6.0，8.0，10 | 3.0，4.0，5.0，6.0，8.0，10 | 3.0，4.0，5.0，6.0，8.0，10 | 3.0，4.0，5.0，6.0，8.0，10 | 3.0，4.0，5.0，6.0，8.0，10，12 | 3.0，4.0，5.0，6.0，8.0，10，12 | 4.0，5.0，6.0，7.0，8.0，10，12 |
| Medium to large diameter precision tube with a diameter of Φ 63-110 (oil cylinder barrel, heavy-duty liner, mechanical cylinder body) |
| Outer diameter (mm) | 63
| 70 | 76 | 80 | 85 | 90 | 100 | 108 |
Common wall thickness (mm) | 5，6，8，10，12，14，16 | 5，6，8，10，12，14，16 | 5，6，8，10，12，14，16，20 | 6，8，10，12，14，16，20 | 6，8，10，12，14，16，20 | 6，8，10，12，14，16，20 | 8，10，12，14，16，20，25 | 8，10，12，14，16，20，25 |
| Precision honing tube for hydraulic/cylinder barrel (popular machining sizes) |
| Outer diameter of cylinder blank x wall thickness(mm) | 50x7 | 60x8 | 63x8 | 80x10 | 100x12 | 120x15 |
| Common inner diameter of finished products(mm) | Φ36 | Φ44 | Φ47 | Φ60 | Φ76 | Φ90 |
Optional tolerance range |
| Tolerance control | Optional manufacturing process |
| Tolerance ≤ 0.05 mm | Cold rolling |
| Tolerance ≤ 0.10 mm | Cold rolling |
| Tolerance ≤ 0.30 mm | Cold drawing | Cold rolling |
| Tolerance ≤ 0.50 mm | Cold drawing | Hot rolling |
| Tolerance ≤ 1.00 mm | Hot rolling | Hot expanding |
| Outer diameter/inner diameter tolerance (cold working+C,+LC, most commonly used) |
| Outer diameter (mm) | 4‑30 | 30‑40 | 40‑50 | 50‑60 | 60‑70 | 70‑80 | 80‑100 | 100‑120 | 120‑150 |
| Ordinary level deviation (mm) | ±0.10 | ±0.15 | ±0.20 | ±0.25 | ±0.30 | ±0.35 | ±0.40 | ±0.50 | ±0.75 |
| Advanced precision deviation (mm) (specified in the contract) | ±0.05 | ±0.08 | ±0.10 | ±0.12 | ±0.15 | ±0.18 | ±0.20 | ±0.25 | ±0.38 |
| The tolerance of the heat treatment state (+SR/+A/+N) will be relaxed, which is approximately+50% -100% higher than the above table. Hydraulic/machined blanks should be selected for+C/+LC delivery as much as possible. |
| Wall thickness tolerance (mandatory by national standards) |
| Normal level | Advanced precision (negotiated) |
| ± 10% S or ± 0.10 mm, whichever is larger | ± 5% S, minimum ± 0.10mm |
| Example: Wall thickness 5mm → Normal ± 0.50mm; Wall thickness 1.5mm → Normal ± 0.15mm |
| Geometric tolerances (ellipticity, straightness) |
| Ellipticity (non circularity) |
| Ordinary grade | Advanced |
| ≤ 80% of outer diameter tolerance | ≤ 60% of outer diameter tolerance |
| Straightness (curvature) |
| Normal | Advanced precision | Honing cylinder |
| ≤ 1.0 mm/m | ≤ 0.5 mm/m | ≤ 0.3 mm/m |
Optional delivery status
|
| Oil removal from oil pipes | Annealing and straightening | Steel pipe corrosion prevention |
| Steel pipe threading | Length cut-to-length | Steel pipe coating |
| Steel pipe cap | Exquisite bundling | Beveling |
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