Product Overview – S355JR+N Seamless Pipes
S355JR+N Seamless Pipes are premium-quality high-strength structural steel pipes manufactured according to EN 10025 standards and supplied in the Normalized (+N) condition. The normalizing process refines the steel's grain structure, resulting in improved toughness, better mechanical consistency, enhanced weldability, and superior performance under dynamic loading conditions.
Unlike standard S355JR pipes, S355JR+N seamless pipes provide greater reliability for critical industrial applications where structural integrity and long-term durability are essential. The seamless manufacturing process eliminates welded joints, making these pipes ideal for high-pressure service, heavy engineering, offshore platforms, power generation, oil & gas processing, and industrial infrastructure.
With a minimum yield strength of 355 MPa, S355JR+N seamless pipes are widely selected by EPC contractors, engineering consultants, fabrication companies, and project procurement teams across the UAE, Saudi Arabia, Qatar, Oman, Kuwait, India, and other international markets.
Standard & International Identification - S355JR+N seamless pipes
Technical Specifications – S355JR+N 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 |
| Delivery Condition: | Normalized (+N) |
| 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 – S355JR+N Seamless Pipes
(As per ASTM specification)
| Element | Max (%) |
|---|---|
| Carbon (C): | 0.24% |
| Manganese (Mn): | 1.60% |
| Silicon (Si): | 0.55% |
| Phosphorus (P): | 0.035% |
| Sulfur (S): | 0.035% |
| Nitrogen (N): | 0.012% |
Note: The carefully balanced chemical composition of S355JR+N provides high structural strength, excellent weldability, improved toughness, and dependable long-term performance for demanding industrial applications.
Mechanical Properties – S355JR+N Seamless Pipes
| Property | Minimum Value |
|---|---|
| Tensile Strength | 470–630 MPa |
| Yield Strength | 355 MPa |
| Elongation | 22% |
| Impact Test | 27 Joules at +20°C |
Note :The normalized condition enhances the mechanical consistency of S355JR+N seamless pipes, making them highly suitable for structural engineering, pressure applications, offshore construction, and heavy industrial projects.
Testing & Inspection
Applications of S355JR+N Seamless Pipes
- Where S355JR+N Seamless Pipes are used:
- 🔸High-Pressure Process Piping
- 🔸Oil & Gas Pipelines
- 🔸Power Generation Plants
- 🔸Hydraulic Systems
- 🔸Heavy Equipment Manufacturing
- 🔸Engineering Fabrication
Understanding Stainless Steel Grades ?
have a look what experts says !
Key Advantages of S355JR+N Seamless Pipes
Best Alternatives to S355JR+N Seamless Pipes
1. S355J2+N Seamless Pipes (Low-Temperature Performance)
- This process provides:
- 🔸 Impact tested at -20°C
- 🔸 Higher toughness for cold environments
- 🔸 Excellent for offshore and pressure equipment
Best for: Offshore platforms, LNG terminals, power plants, and demanding industrial projects.
2. S355JO Seamless Pipes (Impact Tested at 0°C)
- 🔸 Good impact resistance at moderate low temperatures
- 🔸 Excellent structural performance
- 🔸 Cost-effective engineering solution
Best for: Bridges, industrial structures, fabrication, and infrastructure projects.
3. ST52-2 Seamless Pipes (Engineering & Hydraulic Applications)
- 🔸 Excellent machinability
- 🔸 High mechanical strength
- 🔸 Popular in hydraulic cylinders and industrial machinery
Best for: Hydraulic systems, engineering equipment, and heavy machinery manufacturing.