P275N steel plate: composition, advantages and applications

EN 10028-3 P275N is a widely used pressure vessel steel known for its balanced chemical composition, reliable mechanical properties, and excellent fabrication performance.

EN 10028-3 P275N

As a typical P275N pressure vessels steel, it plays an important role in industries requiring strength, safety, and long-term durability.

As a widely used P275N pressure vessels steel, the specification range directly determines its applicability in different projects. We provide flexible sizes and delivery options to meet various industrial requirements.

These specifications make P275N pressure vessels steel suitable for a wide range of applications, from standard boiler manufacturing to customized pressure vessel fabrication.

The chemical composition of P275N Material is carefully controlled to ensure excellent strength, toughness, and weldability for P275N pressure vessels steel applications.

This balanced composition ensures that P275N pressure vessels steel achieves an optimal combination of strength, weldability, and toughness, making it ideal for pressure vessel and boiler applications

EN 10028-3 P275N steel offers a strong combination of strength and toughness:

Yield Strength: ≥ 275 MPa

Tensile Strength: 390 – 510 MPa

Key Advantages:

1. High Strength
The strength level of P275N Material meets the requirements of most medium-pressure engineering structures, making it suitable for a wide range of industrial applications.

2. Good Toughness & Fatigue Resistance
This steel maintains stability under cyclic loads and complex stress conditions, helping to extend the service life of equipment.

3. Excellent Weldability
Low carbon content and balanced alloying elements make P275N pressure vessels steel easy to weld, reducing fabrication difficulty and cost.

4. Good Processing Performance
It supports cutting, forming, and welding processes efficiently, improving overall production efficiency.

Thanks to its excellent comprehensive properties, P275N pressure vessels steel is widely used in multiple industries:

Pressure Vessels & Industrial Equipment

• Single-layer and multi-layer pressure vessels
• Coil-welded containers
• Heat-sleeve containers
• Low-temperature pressure vessels

Oil, Gas & Chemical Industry

• Storage tanks
• Process vessels
• Petrochemical equipment

Power Plants & Boilers

• Boiler components
• Steam-related equipment
• Heat exchange systems

Structural & Engineering Applications

• Building structures
• Bridge engineering components

In these applications, P275N Material provides reliable structural support and ensures safe operation under pressure and temperature conditions.

With its optimized chemical composition, strong mechanical properties, and wide applicability, EN 10028-3 P275N steel has become a key material in pressure vessel and industrial equipment manufacturing.

As a dependable P275N pressure vessel steel, it offers an ideal balance of strength, weldability, and durability, making it a cost-effective solution for a wide range of engineering projects.

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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.