Product Overview：
Hydraulic seamless steel pipes are produced by adding alloy elements to high-quality carbon structural steel to enhance its strength, toughness, and hardenability. After fabrication, these steel pipes typically undergo processes such as tempering, chemical heat treatment, and surface quenching. Compared to high-quality carbon structural steel, they exhibit superior comprehensive mechanical properties. Although their corrosion resistance is not as good as stainless steel, their wear resistance and machinability are significantly better. Representative materials include 20#, 45#, 27SiMn, etc. These steel pipes are commonly used in important hydraulic support pipes, structural components in machinery, and hydraulic cylinders in coal mines.
| Product List |
| Product Name: | Seamless steel pipe for GBT17396 hydraulic prop |
| Product Name: | GB8713 Precision inner diameter seamless steel tube for hydraulic cylinder barrel |
| Product Name: | 20# hydraulic seamless steel pipe | seamless pipe |
| Product Name: | 45# hydraulic seamless steel pipe | seamless pipe |
| Product Name: | 27SiMn hydraulic seamless steel pipe | seamless pipe |
| Product Name: | Seamless steel tube for precision cold rolling hydraulic applications | Seamless tube |
| Product Name: | Hot-rolled hydraulic seamless steel pipe | Seamless pipe |
| Product Name: | National standard hydraulic seamless steel pipe | Seamless pipe |
| Parameter range |
| Outer diameter | 10mm-168mm |
| Wall thickness | 0.5mm - 20mm (Note: subject to OD) |
| Standard length | 1m - 12m (Random or Fixed) |
| Outer diameter accuracy | Maximum ±0.03mm |
| Executive Standards | DIN 2391, ASTM A519, GB/T 3639 |
| Non-standard customization | Custom sizes & lengths accepted (OEM/ODM Supported) |
| Commonly used high-frequency specifications in the market (outer diameter x wall thickness mm) |
| Inner diameter (mm) | 20 | 25 | 30 | 40 | 50 | 63 |
| Supporting outer diameter (mm) | 25 | 32 | 38 | 50 | 63 | 80 |
| Wall thickness range (mm) | 2.5-4.0 | 3.0-5.0 | 3.0-6.0 | 3.0-8.0 | 3.5-8.0 | 4.0-10.0 |
Inner diameter (mm) | 80 | 100 | 125 | 150 | 160 | 180 |
| Supporting outer diameter (mm) | 100 | 120 | 150 | 180 | 190 | 210 |
Wall thickness range (mm) | 5.0-12.0 | 5.0-15.0 | 6.0-18.0 | 8.0-20.0 | 8.0-20.0 | 10.0-20.0 |
| GB/T3639-2021: Precision Bright Tube (with outer diameter tolerance as the main criterion) GB/T8713: Hydraulic cylinder tube (with inner diameter tolerance H8/H9/H10 as the main, honing cylinder tube preferred) |
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 tolerance (cold hard state+C/+LC) |
Outer diameter (mm) | 5-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-80 | 80-100 |
| Outer diameter deviation (mm) | ±0.08 | ±0.10 | ±0.15 | ±0.20 | ±0.25 | ±0.30 | ±0.35 | ±0.45 |
Heat treatment state (+SR annealing): The tolerance of the thin-walled tube is increased by 1.5-2 times Wall thickness tolerance: ± 10% S, minimum ± 0.10mm |
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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