Product Overview – S355JO Seamless Pipes
S355JO Seamless Pipes are high-strength structural steel pipes manufactured according to EN 10025 standards for demanding engineering, infrastructure, offshore, construction, and industrial applications. These pipes are produced without welded joints, providing superior pressure resistance, uniform strength, and exceptional structural integrity.
The "JO" designation indicates that the material has been impact tested at 0°C, making S355JO an excellent choice for projects operating in moderately low-temperature environments where enhanced toughness is essential. With a minimum yield strength of 355 MPa, S355JO seamless pipes combine excellent mechanical performance, outstanding weldability, and long-term durability.
These pipes are widely used by EPC contractors, fabrication companies, oil & gas operators, infrastructure developers, and industrial manufacturers throughout the UAE, Saudi Arabia, Qatar, Oman, Kuwait, and other global markets.
Standard & International Identification - S355JO Seamless Pipes
Technical Specifications – S355JO Seamless Pipes
| Outside Diameter: | 21.3 mm to 660 mm |
| Wall Thickness: | 2 mm to 60 mm |
| Manufacturing: | Hot Finished / Cold Drawn |
| Length: | 3 M to 12 M, Single Random, Double Random |
| Pipe Ends: | Plain End, Bevel End, Threaded End |
| Surface Finish: | Black Painted, Oiled, Pickled, Anti-Rust Coated |
| Available Sizes: | ½" , ¾", 1", 1½", 2", 3", 4", 6", 8", 10", 12", 14", 16", 20", 24" |
Custom sizes are available according to project requirements.
Third Party Inspection Available
All specifications are in accordance of EN 10025. Mechanical and chemical values are as per standard limits. Mill Test Certificates (MTC) available upon request.
Chemical Composition – S355JO Seamless Pipes
(As per ASTM specification)
| Element | Max (%) |
|---|---|
| Carbon (C): | 0.20% |
| Manganese (Mn): | 1.60% |
| Silicon (Si): | 0.55% |
| Phosphorus (P): | 0.030% |
| Sulfur (S): | 0.030% |
| Nitrogen (N): | 0.012% |
Note: The carefully controlled chemical composition of S355JO seamless pipes provides an excellent balance of strength, weldability, toughness, and durability, making them ideal for structural, industrial, and engineering applications.
Mechanical Properties – S355JO Seamless Pipes
| Property | Minimum Value |
|---|---|
| Tensile Strength | 470–630 MPa |
| Yield Strength | 355 MPa |
| Elongation | 22% |
| Impact Test | 27 Joules at 0°C |
Note :The mechanical properties of S355JO ensure reliable performance in structural steelwork, industrial plants, offshore installations, and infrastructure projects where strength and impact resistance are equally important.
Testing & Inspection
Applications of S355JO Seamless Pipes
- Where S355JO Seamless Pipes are used:
- 🔸Structural Steel Frameworks
- 🔸Industrial Construction
- 🔸Bridge Structures
- 🔸Pressure Piping Systems
- 🔸Structural Engineering
- 🔸Industrial Machinery
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Key Advantages of S355JO Seamless Pipes
Best Alternatives to S355JO Seamless Pipes
1. S355JR Seamless Pipes (Standard Structural Applications)
- 🔸 Excellent strength and weldability
- 🔸 Cost-effective for general construction
- 🔸 Suitable for buildings, bridges, and fabrication
Best for: General structural engineering and industrial construction.
2. S355J2+N Seamless Pipes (Low Temperature & Critical Projects)
- 🔸 Impact tested at -20°C
- 🔸 Higher toughness than S355JO
- 🔸 Preferred for offshore and demanding environments
Best for: Offshore platforms, power plants, and heavy engineering.
3.ST52-2 Seamless Pipes (Engineering & Hydraulic Systems)
- 🔸 Excellent machinability
- 🔸 High mechanical strength
- 🔸 Popular in hydraulic cylinders and industrial machinery
Best for: Mechanical engineering, hydraulic systems, and equipment manufacturing.