Seamless hydraulic tubes are commonly used in hydraulic systems and are widely applied in various industrial fields due to their characteristics such as weldless, high strength, high pressure resistance, and corrosion resistance. These pipes are made from high-quality materials and can withstand the stringent requirements of hydraulic systems in different industries. Common application areas include hydraulic systems, pneumatic systems, oil and gas industry, automotive industry, industrial machinery, aerospace, and defense.
Tubes designed for hydraulic systems are seamless cold-drawn steel tubes employed in distributing and circulating pressure within hydraulically powered machinery. The fluid’s velocity and pressure undergo notable fluctuations, causing pressure spikes along the inner surface of the tubes.
| 外径公差 Outside Diameter Tolerance | 壁厚公差 Wall Thickness Tolerance | ||
| 士1% | +15%/-10% | ||
| D≤50mm | +0.5mm | da≤130mm | |
| S≤2Sn | +15%/-10% | ||
| 2Sn<S≤4Sn | +12.5%/-10% | ||
| S>4Sn | ±9% | ||
| D>50mm | 士1% | da>130mm | |
| S≤0.05da | 士15%/-10% | ||
| 0.05da<S≤0.11da | 士12.5% | ||
| S>0.11da | 士10% | ||
Steel Grade and Chemical compositions
| Steel Grade | C | Si | Mn | P | S | Cr | Mo | V | Ni | Cu |
| 37Mn | 0.34-0.40 | 0.10-0.30 | 1.35~1.65 | ≤0.025 | ≤0.020 | ≤0.30 | — | — | ≤0.30 | ≤0.20 |
| 30CrMo | 0.26-0.34 | 0.17-0.37 | 0.40-0.70 | ≤0.025 | ≤0.020 | 0.80-1.10 | 0.15-0.25 | — | ≤0.30 | ≤0.20 |
| 34Mn2V | 0.30-0.37 | 0.17~0.37 | 1.40~1.75 | ≤0.025 | ≤0.020 | ≤0.30 | — | 0.07-0.12 | ≤0.30 | ≤0.20 |
| 35CrMo | 0.32~0.40 | 0.17~0.37 | 0.40~0.70 | ≤0.025 | ≤0.020 | 0.80-1.10 | 0.15~0.25 | — | ≤0.30 | ≤0.20 |
| 34CrMo4 | 0.30-0.37 | 0.15-0.35 | 0.50-0.80 | ≤0.025 | ≤0.020 | 0.90-1.20 | 0.15-0.25 | — | ≤0.30 | ≤0.20 |
Hydraulic tubing is created from carbon steel. Its smooth, clean inside surface prevents damage to valves and cylinders in hydraulic, diesel fuel injection, lubrication, heating oil, air conditioning, and other high-pressure situations. For the best performance, use it with standard fittings.
Plastic Caps Plugged, Bundled/in Bulk, Waterproof Paper Wrapped
Seamless hydraulic tubing, made of seamless carbon steel, is perfect for flaring and bending. Its smooth interior surface prevents damage to valves and cylinders. Use it with standard fittings in hydraulic, diesel fuel injection, lubrication, refrigerator generator pump, heating coil, air conditioner, and other high-pressure settings.
Compared to mechanical and electric transmission, hydraulic drive offers several advantages:
1. Hydraulic drive components can be easily and flexibly arranged.
2. It’s lightweight, compact, with low inertia, and quick response.
3. Easy to control, offering a wide range of continuous speeds (up to 2000:1 speed range).
4. Comes with automatic overload protection.
5. Typically uses mineral oil as a working medium, providing self-lubrication for extended service life.
6. Easily achieves linear motion.
7. Facilitates automation, especially when combined with electro-hydraulic control, enabling higher levels of automated control and remote operation.
