What is EN 10028-3 P275N pressure vessel steel plate

When it comes to manufacturing safe and durable pressure equipment, P275N pressure vessel steel plate is one of the most reliable and widely used materials in the European market.

P275N pressure vessel steel plate

As a professional steel supplier, Gnee Steel provides high-quality EN 10028-3 P275N plates with stable performance, competitive pricing, and global delivery. If you are looking for a cost-effective solution for boilers, tanks, or pressure vessels, P275N is a smart and proven choice.

P275N is a normalized, fine-grain non-alloy steel designed specifically for pressure vessel applications under the EN 10028-3 standard. The "P" stands for pressure purposes, while "275" indicates the minimum yield strength of 275 MPa.

This grade is widely used due to its excellent balance of strength, toughness, and weldability, making it suitable for equipment operating under moderate to high pressure and temperature conditions.

The chemical composition of P275N is carefully controlled to ensure good mechanical performance and weldability.

Low carbon content ensures excellent weldability, while controlled nitrogen helps achieve fine grain structure, improving toughness.

P275N offers reliable mechanical strength and impact resistance, which are critical for pressure-bearing applications.

These values ensure that the material can withstand internal pressure without deformation while maintaining sufficient ductility.

1. Excellent Weldability

P275N is easy to weld using conventional welding methods without requiring complex preheating or post-treatment, which significantly reduces fabrication costs.

2. Balanced Strength and Toughness

It offers a stable combination of moderate strength and high toughness, reducing the risk of brittle fracture under dynamic loads or temperature fluctuations.

3. Good Pressure Resistance

With a yield strength of 275 MPa, P275N can effectively resist internal pressure, ensuring long-term structural integrity of vessels.

4. Cost-Effective Solution

Compared with higher alloy grades, P275N provides adequate performance at a lower cost, making it ideal for standard pressure vessel projects.

P275N is widely used across industries where pressure containment and safety are critical:

Petrochemical industry: reactors, storage tanks, heat exchangers

Power plants: steam-water separators, boilers

Oil & gas: pressure pipelines and vessels

Industrial equipment: compressed air tanks, process containers

Its versatility makes it a preferred material for both fabricators and engineering contractors.

Compared with similar grades:

P275N vs P355N: P355N offers higher strength but comes at a higher cost

P275N vs ASTM A516 Grade 60: P275N provides comparable strength with better European standard compliance

P275N vs P265GH: P275N has improved impact performance and structural reliability

Choosing the right supplier is just as important as choosing the right material. Gnee Steel ensures:

• Strict compliance with EN 10028-3 standards
• Stable mechanical performance and certified quality
• Custom sizes, cutting, and processing services
• Fast production and worldwide shipping
• Professional export experience and technical support

As a professional steel supplier, Gnee Steel provides high-quality P275N steel plates with stable mechanical properties, strict quality control, and fast global delivery.

Whether your project involves tanks, boilers, or reactors, choosing the right material at the beginning can significantly reduce long-term risks and maintenance costs.

If you are comparing multiple grades and looking for a cost-effective alternative without compromising safety, this guide will help you understand why P275N is worth considering.

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What are the core differences between P275N, P275NH, P275NL1, and P275NL2?

The core differences lie in impact test temperature and applicable working conditions. All four grades have a minimum yield strength of ≥275MPa (for thickness ≤16mm) and comply with the EN 10028-3 standard:

P275N: Impact test at -20°C, suitable for normal-temperature pressure vessels and general industrial pipelines;

P275NH: Impact test at -20°C, optimized for high-temperature performance, adaptable to medium-to-high temperature pressure equipment below 350°C;

P275NL1: Impact test at -40°C, suitable for low-temperature storage tanks and separators in cold regions;

P275NL2: Impact test at -50°C, offering the best ultra-low temperature toughness, adaptable to cryogenic equipment such as liquid nitrogen/LNG systems.

What are the corresponding numerical designations for these four grades?

P275N: 1.0483;

P275NH: 1.0485;

P275NL1: 1.0488;

P275NL2: 1.1104.

Does thickness affect performance?

Yes, it does. When the thickness exceeds 16mm, the yield strength gradually decreases (e.g., ≥245MPa for 63~100mm), and the low-temperature toughness also slightly declines. For ultra-low temperature working conditions with thickness ＞40mm, it is recommended to prioritize P275NL2 and increase the sampling ratio for impact tests.

What are the key mechanical property indicators of the four grades?

Yield Strength (ReH): ≥275MPa for thickness ≤16mm, slightly decreasing with increasing thickness (e.g., ≥255MPa for 40~63mm);

Tensile Strength (Rm): 410~560MPa;

Impact Energy (KV): ≥27J for each corresponding impact temperature (regular supply meets ≥40J to enhance safety redundancy);

Elongation (A): ≥22%~24% (adjusted with thickness).

What is the range of available dimensions?

Thickness: 6mm~300mm;

Width: 1500mm~4800mm;

Length: 6000mm~18000mm;

Customized cutting, drilling, and beveling services are available, with a minimum cutting size of 500×500mm.

How is the weldability, and what are the welding recommendations?

It has excellent weldability (CEV ≤0.43%), with recommended solutions:

Welding Consumables: E5515-C1 for manual arc welding, H08MnA+F55A4 flux for submerged arc welding, and ER50-6 for gas metal arc welding;

Preheating Requirement: No preheating required for thickness ≤30mm; preheat to 100~150°C for thickness ＞30mm;

Interpass Temperature: ≤250°C, with heat input controlled at 15~35kJ/cm;

Post-Weld Heat Treatment (PWHT): Recommended for thick plates (＞50mm) – stress relief annealing at 580~620°C for 2 hours.

Can the P275 series be substituted for ASTM A516 Gr70 (American standard) or Q345R (Chinese standard)?

vs. ASTM A516 Gr70: Similar strength, but the P275 series offers better low-temperature toughness . The P275 series is preferred for European projects, while ASTM A516 Gr70 is suitable for North American projects;

vs. Q345R (GB 713): Q345R has higher yield strength (≥345MPa), but the P275 series excels in low-temperature performance (-20°C impact) and high-temperature stability. For international projects, it is recommended to select according to the EN standard first.

What are the differences between P275NL1/NL2 and 16MnDR (Chinese standard)?

16MnDR (GB 3531): Impact test at -40°C, yield strength ≥315MPa, suitable for domestic low-temperature projects;

P275NL1: Impact test at -40°C, yield strength ≥275MPa, belonging to the European standard system with higher international recognition;

P275NL2: Impact test at -50°C, offering better low-temperature toughness than 16MnDR, adaptable to more severe cryogenic working conditions.