P355 steel range are pressure vessel steel grades with good weldability and high resistance to brittle cracking, P355NH is used by the world's fabricators for the manufacture of pressure vessel tanks for the storage of pressurised gases.
Nomenclature Breakdown of P355 Boiler Plate Grades
- P – Pressure equipment usage
- 355 – Minimum yield stress (MPa) for t ≤ 16 mm
- N – Normalized delivery (or normalized rolled)
- H – Standard elevated-temperature properties, impact tested at -20°C
- L1 – Low-temperature toughness, impact tested at -40°C
- L2 – Enhanced low-temperature toughness, impact tested at -50°C
Understanding these suffixes helps design engineers match the right P355NH, NL1, or NL2 steel to the vessel's design temperature and code requirements.
Key Differences Between P355NH, P355NL1, and P355NL2
While their chemical composition ranges are essentially identical and defined by the same heat analysis limits, the critical difference lies in the guaranteed impact energy at low temperature. All three must achieve 27 J minimum on longitudinal Charpy V‑notch specimens, but at different test temperatures. This directly influences material selection: P355NH suits standard boiler shells, P355NL1 fits refrigerated pressure vessels, and P355NL2 meets the demands of cryogenic storage down to -50°C. GNEE maintains separate stocks for each grade to preserve full traceability and certification.
Normalized P355NL1 steel plates stacked in GNEE's warehouse
Mechanical Properties of EN 10028 – P355 NH/NL1/NL2
| Grade | Type | Thickness (mm) | Yield Strength MPa (min) |
Tensile Strength MPa |
Elongation % (min) |
|---|---|---|---|---|---|
| P355 NH | Normalized | ≤ 16 | 355 | 490 - 630 | 21 |
| P355 NL1 | 16> to ≤40 | 345 | 490 - 630 | 21 | |
| P355 NL2 | 40> to ≤60 | 335 | 490 - 630 | 21 | |
| 60> to ≤100 | 315 | 470 - 610 | 21 | ||
| 100> to ≤150 | 305 | 460 - 600 | 21 | ||
| 150> to ≤250 | 295 | 450 - 590 | 21 |
Chemical Composition of EN 10028 – P355 NH/NL1/NL2
| P355 NH | P355 NL1 | P355 NL2 | |
|---|---|---|---|
| C | 0.18 | 0.16 | 0.16 |
| Si | 0.50 | 0.40 | 0.40 |
| Mn | 1.10 to 1.70 | 0.80 to 1.50 | 0.80 to 1.50 |
| P | 0.025 | 0.025 | 0.020 |
| S | 0.015 | 0.015 | 0.010 |
| Al | 0.020 | 0.020 | 0.020 |
| N | 0.012 | 0.012 | 0.012 |
| Cr | 0.30 | 0.30 | 0.30 |
| Cu | 0.30 | 0.30 | 0.30 |
| Mo | 0.08 | 0.08 | 0.08 |
| Nb | 0.05 | 0.05 | 0.05 |
| Ni | 0.50 | 0.50 | 0.50 |
| Ti | 0.03 | 0.03 | 0.03 |
| V | 0.05 | 0.05 | 0.05 |
Applications of P355NH, NL1, and NL2 Steel in Boilers and Pressure Vessels
The EN 10028‑3 P355 family covers the full spectrum of pressure equipment operating within its temperature limits. Common applications include:
- Steam boilers, drums, and superheaters (P355NH)
- Heat exchangers and condensers (P355NH / NL1)
- LPG and ammonia storage spheres (P355NL1)
- Low‑temperature process columns and knock‑out drums (P355NL2)
- Autoclaves and digesters in the pulp and paper sector (P355NH)
- Offshore and arctic pressure vessels (P355NL2)
Regardless of which grade you need, GNEE can supply single plates for a repair project or multi‑hundred‑ton lots for a new plant.
GNEE Supply Capabilities and Inventory for EN 10028 P355 Plates
We keep more than 4,000 metric tons of P355NH, P355NL1, and P355NL2 in stock, covering the most called‑for thicknesses. This ex‑stock availability allows us to load containers or trucks within 24 hours of order confirmation.
Standard Stock Range
| Parameter | Availability |
|---|---|
| Thickness | 6 mm – 250 mm |
| Width | 1,500 mm – 4,000 mm |
| Length | Up to 18,000 mm |
| Delivery Condition | Normalized (N) |
| Certification | EN 10204 Type 3.1 as standard; Type 3.2 by arrangement |
| Surface | Shot‑blasted and shop‑primed on request |
Mill‑origin plates can also be arranged for dimensions that fall outside our fast‑moving inventory. Talk to us about your mill test certificate and marking requirements.
Why Choose GNEE as Your EN 10028 P355 NH, NL1, NL2 Supplier?
- Immediate availability – thousands of tons in stock eliminates mill waiting times
- Tailored processing – get plates delivered in the exact sizes your workshop needs
- Expert technical support – our metallurgists help with grade selection, welding recommendations, and code interpretation
- Competitive factory pricing – cutting out traders lowers your procurement cost
- Reliable logistics – we manage containerized and break‑bulk shipments to ports across six continents
Seaworthy wooden pallets of P355NL1 and NL2 steel plates
Conclusion – Secure Your EN 10028 P355 NH, NL1, NL2 Steel Supply Today
Delayed materials mean delayed projects and rising budgets. As a manufacturer with deep inventory and fast processing, GNEE keeps your schedule on track. Specialize your next order of EN 10028 P355 NH, NL1, or NL2 steel by sending your plate list or component drawings now.
Our team will return a detailed, no‑obligation quotation that includes cutting, testing, and shipping to your destination port. Hit the "Request a Quote" button and put certified boiler and pressure vessel steel into production faster than ever.
What is the ASME material equivalent to P355NL1?
What is the asme material equivalent to P355NL1? ASME material equivalent to EN 10028-3 P355NL1 is ASME SA516 Grade 70.
What is the impact test for P355NL1?
The designation P355NL1 steel pipe shows that this is steel for pressure purposes (P) with minimum yield strength of 355 MPa (355) which is impact tested in the transverse direction at -40 deg C (NL1). P355NL1 steel tube this material is mainly used to fabricate boiler and pressure vessel.
What is the difference between P355NL1 and P355NL2?
P355NL1 is tested at -40°C, making it suitable for routine cold environments. P355NL2 offers superior resilience, having passed transverse impact tests at -50°C, ideal for extremely low-temperature operations.
What is the difference between P355NL and S355NL?
What is the main difference in S355NL vs P355NL? S355NL is a structural steel under EN 10025-3 for general use with -50°C toughness; P355NL is a pressure vessel steel under EN 10028-3 with stricter weld quality, lower S/P/N, and PED compliance for safety-critical vessels.
What is P355NH material?
A pressure vessel steel grade with good weldability and high resistance to brittle cracking, P355NH is used by the world's fabricators for the manufacture of pressure vessel tanks for the storage of pressurised gases.
What is P355GH material?
Steel for heat-resistant pressure vessels. P355GH steel gives optimum performance for pressurised products that must support a creep limit greater than 180N/mm2 at 400ºC. These types of steel are characterised by good weldability.
