P460NH is a high-performance non-alloy pressure vessel steel grade that strictly complies with the European standard EN 10028-3, which governs the technical delivery requirements for steels used in pressure-bearing equipment. Boasting excellent weldability that allows for seamless joining via common welding processes, high mechanical strength to withstand substantial pressure loads, and superior toughness even under fluctuating temperature conditions, this steel grade is well-suited for fabricating pressure vessels, boilers, and related components that operate stably under moderate temperature environments, ensuring reliable performance in industrial applications.
Mechanical Properties
| Grade | Type | Thickness (mm) | Yield Strength MPa (min) |
Tensile Strength MPa |
Elongation % (min) |
|---|---|---|---|---|---|
| P460 NH | Normalized | ≤ 16 | 460 | 570 - 750 | 17 |
Chemical Composition
| P460 NH | |
|---|---|
| C | 0.20 |
| Si | 0.60 |
| Mn | 1.10 to 1.70 |
| P | 0.025 |
| S | 0.015 |
| Al | 0.020 |
| N | 0.025 |
| Cr | 0.30 |
| Cu | 0.70 |
| Mo | 0.10 |
| Nb | 0.05 |
| Ni | 0.80 |
| Ti | 0.03 |
| V | 0.20 |
advantages
• High strength: With a minimum yield strength of 460 MPa, P460NH provides excellent load‑bearing capacity, allowing for the design of lighter and more cost‑efficient structures without compromising safety.
• Good toughness at low temperatures: The steel maintains high impact energy even at temperatures down to approximately -20°C, reducing the risk of brittle fracture and ensuring reliable performance in cold environments.
• Excellent elevated‑temperature performance: P460NH retains its strength and microstructure stability under long‑term exposure to temperatures up to around 400°C, making it ideal for boiler and pressure vessel components.
• Good weldability: The material can be readily welded using standard industrial processes, provided appropriate preheating and interpass temperature control are applied. This simplifies fabrication and reduces production costs.
• Superior fatigue and creep resistance: Its balanced mechanical properties enable it to withstand cyclic loading and thermal stresses, extending the service life of critical equipment.
• Consistent quality and reliability: Produced under strict European standards (EN 10028‑3), P460NH ensures uniform properties across thicknesses and batches, making it a dependable choice for safety‑critical applications.
processing
• Heating and forming: The steel should be heated uniformly to the recommended temperature range before hot forming, typically between 850°C and 1100°C, to ensure good ductility and avoid cracking. After forming, controlled cooling helps preserve the normalized microstructure and toughness.
• Welding procedures: P460NH is weldable using common methods such as SMAW, GMAW, and SAW, but preheating is often necessary to reduce the risk of hydrogen‑induced cracking. Preheat temperatures usually range from 100°C to 200°C, depending on plate thickness and welding process. Interpass temperatures must also be controlled to prevent excessive heat input.
• Heat treatment: As a normalized steel grade, P460NH is typically supplied in the normalized condition. Post‑weld heat treatment (PWHT) may be required for thick sections or critical applications to relieve residual stresses and improve toughness.
• Cutting and machining: The material can be cut using flame cutting, plasma cutting, or shearing, with proper edge preparation to avoid cold cracking. Machining is generally straightforward, but tool wear may be higher due to the steel's high strength, so appropriate tools and cutting parameters are recommended.
• Surface preparation and inspection: All surfaces should be cleaned and free from contaminants before welding or coating. Non‑destructive testing such as ultrasonic or radiographic inspection is often performed to ensure the quality of welds and base material.
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What standard does P460NH comply with?
P460NH complies with the European standard EN 10028-3, which specifies technical delivery conditions for non-alloy and alloy steels for pressure purposes, focusing on weldable fine-grained steels.
What is the difference between P460NH and P460N?
The main difference is the impact test temperature. P460NH is tested at -20°C, while P460N is tested at 20°C. P460NH has better low-temperature toughness, suitable for colder operating conditions.
What is the maximum operating temperature of P460NH?
The maximum continuous operating temperature of P460NH is around 400°C. Beyond this temperature, its mechanical properties may degrade, affecting the safety of pressure-bearing equipment.
Is P460NH weldable?
Yes, P460NH has excellent weldability. It can be welded using common methods like SMAW, GMAW, GTAW without preheating under normal thickness, ensuring weld joint strength and toughness.
What preheating is required for P460NH welding?
For P460NH with thickness >25mm or in low-temperature environments, preheating to 80-150°C is recommended. This reduces welding stress, prevents cold cracks, and ensures weld quality.
What are the main chemical components of P460NH?
The main chemical components of P460NH include C (≤0.20%), Si (≤0.55%), Mn (1.00-1.60%), P (≤0.025%), S (≤0.015%), and trace elements like N, Al to ensure grain refinement and performance.
What is the delivery condition of P460NH?
P460NH is usually delivered in normalized condition (N), which involves heating to 850-950°C, holding for a certain time, and air cooling. This refines grains and improves mechanical properties.
What is the thickness range of P460NH plates?
The common thickness range of P460NH plates is 6-200mm. Thicker plates may require special heat treatment or preheating during welding to ensure uniform performance and avoid defects.
How to inspect the quality of P460NH?
Quality inspection of P460NH includes chemical composition analysis, mechanical property tests (tensile, yield, impact), ultrasonic flaw detection, and visual inspection to ensure compliance with EN 10028-3 standards.
What is the minimum yield strength of P460NH?
The minimum yield strength of P460NH is 460 MPa (at room temperature), which is the key index determining its bearing capacity in pressure vessel and boiler applications, meeting high-strength requirements.