1. Overview
Hydraulic steel pipes are precision-manufactured seamless steel tubes designed for high-pressure fluid transmission in hydraulic systems. They are engineered to withstand pulsating pressure, mechanical stress, and corrosive media, making them critical components in industrial machinery, construction equipment, and automotive systems.
Common American Standard (ASTM/ASME) Grades
2. Common American Standard (ASTM/ASME) Grades
| Grade |
Standard |
Key Characteristics |
Typical Applications |
| A106 Grade B |
ASTM A106 |
Carbon steel, seamless, high-temperature strength, excellent weldability |
General hydraulic circuits, medium-pressure fluid lines, power plant systems |
| A53 Grade B |
ASTM A53 |
Carbon steel, seamless/welded, cost-effective, versatile for low-to-medium pressure |
Non-critical hydraulic systems, auxiliary lines, structural applications |
| A333 Grade 6 |
ASTM A333 |
Low-temperature carbon steel, impact-resistant at -45°C, seamless |
Cryogenic hydraulic systems, cold-region machinery, low-temperature fluid transmission |
| A519 1020 / 1026 |
ASTM A519 |
Cold-drawn seamless, uniform grain structure, tight dimensional tolerance |
Precision hydraulic tubing, instrument lines, high-pressure small-bore circuits |
| A519 1045 |
ASTM A519 |
Medium-carbon steel, high tensile strength, good hardenability |
Hydraulic cylinder barrels, honed tubes, heavy-duty hydraulic components |
| A519 4130 / 4140 |
ASTM A519 |
Alloy steel, quenched and tempered, exceptional strength and fatigue resistance |
High-pressure hydraulic cylinders, heavy machinery, aerospace-grade systems |
| A312 TP304 / TP316L |
ASTM A312 |
Stainless steel, corrosion-resistant, seamless/welded, high-temperature stability |
Corrosive media systems, marine hydraulics, food-grade and pharmaceutical applications |
3. Core Specifications & Technical Features
Size Range
- Outer Diameter: 6mm - 200mm (1/4" - 8")
- Wall Thickness: 1.0mm - 12.0mm (customizable for high-pressure requirements)
- Standard Length: 6m (custom cut lengths available)
Pressure Ratings
- Low-to-medium pressure: 1,000 - 3,000 PSI (7 - 21 MPa)
- High-pressure: 3,000 - 6,000 PSI (21 - 41 MPa)
- Ultra-high pressure (alloy grades): Up to 10,000 PSI (69 MPa)
Precision & Surface Finish
- Dimensional Tolerance: ±0.10mm (outer diameter), ±10% (wall thickness)
- Inner Surface Roughness: Ra ≤ 0.4μm (for honed cylinder tubes)
- Straightness: ≤ 1.0mm/m (for seamless precision tubes)
4. Key Advantages
High Pressure Resistance: Uniform wall thickness and seamless construction eliminate leak points, ensuring safety under cyclic pressure loads.
Excellent Machinability: Cold-drawn and normalized grades are ideal for threading, flaring, and welding, compatible with standard hydraulic fittings.
Long Service Life: Resistant to fatigue cracking, corrosion, and hydraulic fluid degradation, reducing maintenance costs.
Wide Compatibility: Works with mineral oils, synthetic fluids, water-glycol mixtures, and most industrial hydraulic media.
5. Common Applications
- Construction Machinery (excavators, cranes, loaders)
- Industrial Hydraulic Power Units (HPU)
- Agricultural Equipment (tractors, harvesters)
- Marine & Offshore Hydraulic Systems
- Automotive Manufacturing Lines
- Material Handling Equipment (forklifts, conveyors)
6. Quality & Compliance
All products are manufactured in accordance with international standards, including:
- ASTM A106, A53, A333, A519, A312
- ASME B31.3 (Process Piping Code)
- ISO 9001:2015 Quality Management System
- Third-party testing (UT/ET/MT, PMI, hydrostatic testing) available upon request
Our Services:
1. We have multiple automatic production lines. We can make sure the timely delivery.
2. We offers high-quality products at reasonable prices. We provide professional services to each customer based on their needs.
3. All of our products are produce by our professional workman and we have our high work effect foreign trade team, you can totally believe our service.
4. We have many years experience for export, we cherish every order from our honor.
Transportation: We support sea transportation, air transportation, land transportation and other modes of transportation and Various express delivery methods.
Payment: We support L / C, T/ T, Western Union, MoneyGram and other payment methods
FAQ:
Q:Can you send samples?
A:Of course, we can send samples to all parts of the world.
Q:What are the shipping ports?
A:Under normal circumstances, we ship from Shanghai, Tianjin, Qingdao ports, you can choose other ports according to your needs.
Q:What are the certifications for your products?
A:We have ISO 9001, SGS, EWC and other certifications.
Q:How long does your delivery time take?
A:In general, our delivery time is within 7-15 days, and may be delayed if the demand is extremely large or special circumstances occur.
Q:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.
Q:Does the product have quality inspection before loading?
A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.
Q:How to pack the products?
A:The inner layer has a waterproof paper outer layer with iron packaging and is fixed with a fumigation wooden pallet. It caneffectively protect products from corrosion during ocean transportation.Send your message to this supplier
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