Products Description
P275N and P275NL1 steel plates are both pressure vessel steel grades specified under EN 10028-3 and share the same minimum yield strength of 275 MPa. Because their chemical composition and strength levels are similar, many buyers initially assume they are interchangeable.
EN 10028-3 N is the room temperature quality, NH is for the elevated temperature quality, NL1 is for the low temperature quality and NL2 is for the special low temperature quality.
These steel grades are characterized by a minimum yield strength of 235 - 355 MPa and by good weldability. These grades are used above all for manufacturing boilers, pressure vessels and pipes transporting hot liquids. The user of these steel grades must make sure that his calculation, design and processing methods are appropriate for the material. The grades of this series offer good cold and hot-forming properties.
However, the key difference lies in impact toughness requirements and service temperature.
Understanding this difference is essential for selecting the correct material for pressure vessel safety and compliance.
Shared Characteristics of P275N and P275NL1
Both grades offer:
- Normalized delivery condition
- Good weldability
- Stable mechanical strength
- Suitability for pressure-bearing equipment
This makes them suitable for a wide range of pressure vessel applications.
Key Difference: Low-Temperature Impact Performance
The primary distinction is the mandatory impact test requirement:
| Grade | Impact Test Requirement | Intended Environment |
|---|---|---|
| P275N | Standard (room temperature) | Normal temperature service |
| P275NL1 | ≥ 27 J at –40°C | Low-temperature service |
P275NL1 is specifically designed to maintain toughness at sub-zero temperatures, reducing the risk of brittle fracture.
Application-Based Selection
- P275N steel plate is typically used for:
Standard pressure vessels
Industrial tanks
Heat exchangers in normal environments
- P275NL1 steel plate is preferred for:
Cold-region pressure vessels
Energy infrastructure exposed to low temperatures
Equipment operating in winter or alpine conditions
Cost and Procurement Considerations
Because P275NL1 requires additional testing and stricter quality control, it generally involves higher production and certification costs. For projects without low-temperature requirements, P275N offers a more economical solution.
The difference between P275N and P275NL1 steel plate is not strength, but temperature performance. Selecting the correct grade ensures both safety and cost efficiency.
GNEE STEEL supplies both P275N and P275NL1 steel plates, helping customers choose the most appropriate grade based on actual operating conditions.
👉 Contact GNEE STEEL for technical guidance and quotations.
FAQ：
How does P275N compare with P275NL1/NL2?
NL grades offer better low-temperature impact toughness than P275N.
What standards does P275N comply with?
EN 10028-3 European standard for pressure vessel steels.
What thickness range is available for P275N plates?
Commonly from 6 mm up to 200 mm, depending on production capability.
Can P275N be used for pressure equipment certification?
Yes, it is widely accepted for PED-certified pressure equipment.
Is P275N impact tested?
Standard P275N does not require low-temperature impact testing unless specified.
