Can P355NH be used in pressure vessels?

P355NH is a non-alloy pressure vessel steel grade compliant with EN 10028-2. Boasting excellent high-temperature strength and toughness, it is well-suited for manufacturing pressure vessels and boilers that operate under moderate temperature conditions, and is widely applied in the petrochemical and power generation industries.

Core Applications

Petrochemical and chemical equipment: Core material for pressure-bearing components including reactors (crude oil cracking, chemical synthesis), heat exchangers (medium heat transfer), separators (material separation and purification) and spherical tanks (high-pressure medium storage).

Power generation equipment: Key components for thermal power, nuclear power and hydropower stations, such as boiler drums, nuclear reactor pressure shells, hydropower high-pressure water pipes and turbine volutes.

Energy storage and marine components: Applied to hydrogen energy storage and transportation containers, air separation equipment low-temperature adsorbers, offshore platform structural parts and ship pressure pipelines.

Pharmaceutical and food equipment: Sanitary pressure vessels, raw material storage tanks and transportation pipelines that meet hygiene standards for pharmaceutical and food processing.

Typical Application Scenarios

Petrochemical field: Oil refineries, chemical plants and natural gas processing stations, adapting to high-pressure (up to 10MPa) and alternating temperature (-20℃ to 400℃) working conditions.

Power generation field: Thermal power plant boiler rooms, nuclear power plant reactor buildings and alpine hydropower stations, resisting temperature changes to ensure stable power supply.

Energy storage and marine field: Hydrogen refueling stations, air separation plants, offshore oil and gas platforms and ocean-going ships, withstanding low-temperature impact and salt spray corrosion.

Pharmaceutical and food field: Pharmaceutical raw material workshops, food and beverage processing plants and sterile packaging workshops, meeting FDA and other hygiene standards to avoid product pollution.

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Can P355NH be formed by bending or rolling?

Yes, P355NH has good formability and can be easily bent, rolled, stamped or forged. Proper temperature control (room temperature or slight preheating) is recommended during forming to avoid cracking, especially for thick plates or complex shapes.

What is the delivery condition of P355NH?

P355NH is usually delivered in the normalized condition (symbol: N). The material is heated to the normalization temperature, held for a suitable time to ensure uniform austenitization, then air-cooled to obtain a fine and uniform ferrite-pearlite microstructure.

What is the difference between P355NH and P355NL1?

The key difference is the impact toughness requirement. P355NH has a minimum impact energy of 30 J at -20℃, while P355NL1 requires 27 J at -20℃. Additionally, P355NL1 has stricter control over impurities to improve low-temperature performance.

Can P355NH be used in boiler tubes?

Yes, P355NH is suitable for manufacturing boiler tubes and boiler shells. Its high-temperature strength, good toughness and resistance to thermal fatigue make it capable of withstanding the cyclic temperature and pressure changes in boiler operations.

What is the carbon content limit of P355NH?

The maximum carbon content of P355NH is 0.20% according to EN 10028-2. Controlling carbon content is crucial to ensure weldability and toughness, as excessive carbon can increase brittleness and reduce weld joint performance.

Does P355NH require post-weld heat treatment (PWHT)?

Post-weld heat treatment is recommended for P355NH, especially for thick-walled components or high-stress weld joints. PWHT (usually 550-650℃, holding and slow cooling) relieves welding residual stress, improves weld toughness and reduces the risk of cracking.

What is the application of P355NH in the petrochemical industry?

In the petrochemical industry, P355NH is used to make reactors, separators, storage tanks, heat exchangers and pipelines. It can withstand the high pressure and temperature of petroleum refining and chemical reaction processes, ensuring safe and stable operation.

What is the minimum impact energy of P355NH?

P355NH has a minimum Charpy V-notch impact energy of 30 J at -20℃. This ensures the material has sufficient toughness to resist brittle fracture in low-temperature and high-pressure environments, which is critical for pressure vessel safety.

Can P355NH be used for high-pressure pipelines?

Yes, P355NH is suitable for manufacturing high-pressure pipelines that transport gases, liquids or steam at moderate temperatures. Its high yield and tensile strength, combined with good toughness, ensure it can withstand the high pressure and prevent pipeline rupture.

What are the advantages of P355NH compared to ordinary carbon steel?

Compared to ordinary carbon steel, P355NH has higher strength, better low-temperature toughness, and more stable mechanical properties. It also has excellent weldability and formability, making it more reliable for pressure-bearing applications in harsh environments like high temperature and pressure.