p355nh steel is a normalized weldable fine grain steel used primarily for pressure vessels and boilers. It is defined by the EN 10028-3 standard and offers excellent strength, toughness, and weldability. Below is an overview of its properties, benefits, and applications:
1. Chemical Composition (Weight %)
| Element | Composition (Max, unless range specified) |
|---|---|
| Carbon (C) | ≤ 0.20% |
| Manganese (Mn) | ≤ 1.60% |
| Phosphorus (P) | ≤ 0.025% |
| Sulfur (S) | ≤ 0.015% |
| Silicon (Si) | ≤ 0.40% |
| Aluminum (Al) | ≥ 0.020% |
2. Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (ReH) | ≥ 355 MPa (51,500 psi) |
| Tensile Strength (Rm) | 470–630 MPa (68,200–91,400 psi) |
| Elongation (A) | ≥ 22% (in 200 mm gauge length) |
| Charpy V-Notch Impact | ≥ 40 J at -20°C (-4°F) |
3. Heat Treatment
Normalized: Supplied in the normalized condition to achieve the required mechanical properties.
Weldability: Excellent, with preheating recommended for thicknesses ≥ 25 mm.
4. Benefits
High Strength: Suitable for high-pressure applications.
Excellent Toughness: Performs well in low-temperature environments.
Weldability: Can be easily welded using common methods.
Cost-Effective: Provides a balance of performance and cost.
5. Applications
Pressure Vessels: Storage tanks, reactors, and separators.
Boilers: Boiler drums, headers, and heat exchangers.
Industrial Equipment: Chemical processing and power generation.
6. Standards and Equivalent Grades
EN 10028-3: P355NH (European standard).
ASTM: A516 Grade 70 (similar mechanical properties, but composition may vary).
JIS G3115: SPV355 (Japanese equivalent, similar mechanical properties).
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