EN 10028-3 P275N Boiler And Pressure Vessel Steel Plate

EN10028-3 P275N Boiler And Pressure Vessel Steel Plate is a specific grade of steel plate designed for boilers and pressure vessels under the European standard. It is a normalized, fine-grained, weldable carbon-manganese steel plate with moderate yield strength (275 MPa min), good toughness at -20°C, and excellent weldability. It is a fundamental and widely used material for constructing boilers and pressure vessels intended for service at low to moderate temperatures.

Key Properties:

Good Weldability: Designed to be readily weldable using common methods (SMAW, GMAW, SAW, etc.) without preheating under most conditions (though specific procedures should always be followed).

Good Toughness: The normalized condition provides good notch impact toughness, essential for pressure containment to prevent brittle fracture.

Moderate Strength: Primarily used for components where high strength is not the primary requirement.

Fine Grain Structure: Achieved through microalloying and the normalization process.

EN10028-3 P275N Boiler And Pressure Vessel Steel Plate is mainly used in the manufacturing of medium and low pressure pressure equipment due to its excellent mechanical properties, weldability, and fatigue resistance, including:

1. Pressure Vessels: Shells, heads, dished ends for vessels operating at low to moderate temperatures (typically up to approx. 50°C service temperature).

2. Boilers: Drums, shells, headers for steam boilers operating at similar moderate temperatures.

3. Storage Tanks: For liquids or gases under pressure.

4. Heat Exchangers: Shells and channels.

5. Structural Components: Within pressurized systems where the specific properties are suitable.

Important Considerations:

1. Temperature Limitation: P275N is not suitable for elevated temperature service (creep). For higher temperatures (e.g., above ~300-350°C), grades with "H" designation (like P275NH) are required.

2. Impact Testing: Mandatory. Specifies test temperature (-20°C) and minimum absorbed energy values.

3. Normalized Condition: Essential for achieving the specified properties. The plate is supplied in this condition.

4. Traceability & Certification: Supplied with an inspection certificate (typically EN 10204 3.1 or 3.2) detailing chemical composition, mechanical properties, heat treatment, and test results.