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 Process：
- For the selection of tube billets, flaw detection and peeling are performed on round steel tube billets to remove surface defects;
- Pierce and hot-roll, then process into hot-rolled tubes;
- Cold drawing/cold rolling precision processing, controlling the dimensional accuracy of the tube wall;
- Degrease and remove oil stains from both the inside and outside of the pipe material;
- Bright annealing (protective gas annealing) eliminates processing stress and prevents oxide scale on the inner wall;
- Align and cut to length;
- Cleaning and honing of the inner wall (essential process for high-pressure and servo pipelines) to remove internal iron chips and burrs;
- Appearance inspection, hydrostatic pressure test, and nondestructive testing;
- Rust prevention treatment, packaging, and storage.
| 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 | Φ6mm - Φ219mm |
| Wall thickness | 0.5mm – 20mm |
| Standard length | 1 – 12m |
| Outer diameter accuracy | Maximum ±0.03mm |
| Non-standard customization | Support for customization of non-standard sizes |
Optional tolerance range |
| Tolerance control | Optional manufacturing process |
| Within 5 mils | Cold rolling |
| Within 10 threads | Cold rolling |
| Within 30 threads | Cold drawing | Cold rolling |
| Within 50 threads | Cold drawing | Hot rolling |
| Within 100 threads | Hot rolling | Hot expanding |
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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