P355NL1 P355NL2 Boiler Plate
P355NL1 steel plate is a European standard pressure vessel steel plate, produced in accordance with European standard EN10028. The steel plate is made by converter steelmaking or electric furnace refining fine grain fixed steel. P355NL1 vessel plate has fatigue resistance, low temperature resistance, high yield, strength and toughness.
P355NL2 is a European standard cryogenic container plate. P355NL2 is a European standard container plate. The P355NL2 vessel steel plate grade "L2" indicates that the steel is a special low-temperature high-quality steel. p355NL2 boiler steel plate has good impact toughness and welding performance. Their most widespread use is in applications below -20°.
P355NL1 vs P355NL2 More Detail
P355NL2
Fine grained structural steel for pressure vessels. P355NL2 steel is characterised by good weldability and high resistance to brittle cracking. These types are used above all for manufacturing vessels for pressurised gas (LPG, butane and propane tanks), pressure vessels, parts for steam boilers, pressure piping, compressors, etc. Their most widespread use is in application environments lower than -20º.
P355NL2 steel is supplied in the normalised condition. The normalising temperature is 900 - 950 ºC, and it must be left in the furnace after temperature equalising for approximately 1 minute per millimetre of thickness of the plate. As a result, it offers good cold-forming and hot-forming properties without negatively affecting the material properties.
The fine grained structural steel in this series can be perfectly welded, both manually and using automatic equipment, by means of all known welding processes.
P355NL1
Fine grained structural steel for pressure vessels. P355NL1 steel is characterised by good weldability and high resistance to brittle cracking. These types are used above all for manufacturing vessels for pressurised gas (LPG, butane and propane tanks), pressure vessels, parts for steam boilers, pressure piping, compressors, etc. Their most widespread use is in application environments lower than -20º.
P355NL1 steel is supplied in the normalised condition. The normalising temperature is 900 - 950 ºC, and it must be left in the furnace after temperature equalising for approximately 1 minute per millimetre of thickness of the plate. As a result, it offers good cold-forming and hot-forming properties without negatively affecting the material properties.
The fine grained structural steel in this series can be perfectly welded, both manually and using automatic equipment, by means of all known welding processes.
Know Another P335 Grade P335NH
P355NL1, P355NL2, P355NH, P355GH, 1.0565, 1.0566, 1.0473 – mild, structural steel
P355 grade steel is a high quality structural material with excellent mechanical properties.
P355 steel is mild, fine grain structural steel that is often used in pressure vessels and boilers. Its high strength and corrosion resistance make it the ideal choice for use in demanding industrial applications.
Subgrades of P355 grade steel
P355 grade steel is divided into several subgrades which differ in their specific properties:
P355GH: This steel is designed for high-temperature applications and is characterized by high strength at temperatures up to 500 °C.
P355NH: This steel is designed for low-temperature applications and is characterized by high toughness at low temperatures.
P355NL1 and P355NL2: These steel subgrades are designed for applications where high toughness at low (P355NL1), very low (P355NL2) temperatures and good weldability are required.
In terms of mechanical properties, namely tensile strength, these subgrades are equal, but the value of the yield strength differs between them (it is slightly higher for P355NH). This difference affects the load capacity of the individual alloys belonging to this grade and consequently the possibilities of their use.
P355NL1 Boiler grade plates chemical composition
| Grade | C max | Si max | Mn. max | P max | S max | N max | AL min | Cr max | Cu max | Mo max | Ni max | Nb max | Ti max | V max |
| P355NL1 | 0.18 | 0.50 | 1.10-1.70 | 0.025 | 0.015 | 0.012 | 0.020 | 0.300 | 0.30 | 0.08 | 0.50 | 0.05 | 0.03 | 0.10 |
P355NL2 boiler quality steel mechanical property
| C ≤ |
Si ≤ |
Mn ≤ |
P ≤ |
S ≤ |
Cr | Ni |
|---|---|---|---|---|---|---|
| 0.18 | 0.50 | 0.90-1.70 | 0.025 | 0.015 | ≤0.30 | ≤ 0.50 |
| Mo | Al | Cu | Nb | Ti | V | Ce |
| ≤0.08 | ≥0.020 | ≤0.30 | ≤0.05 | ≤ 0.03 | ≤ 0.10 | |
| N | Co | Pb | B | Other | ||
| ≤0.020 | Nb+Ti+V≤0.12 |
P355NL1 Heat-Treated PVQ Steel Plate mechanical property
| Thickness(mm) | Yield strength (≥Mpa) | Tensile strength (Mpa) | Elongation in ≥,% |
| T≤16 | 355 | 490-630 | 22 |
| 16 | 345 | ||
| 40 | 335 | ||
| 60 | 315 | 470-610 | 21 |
| 100 | 305 | 460-600 | |
| 150 | 295 | 450-590 |
p355NL2 Container steel plate mechanical property
| Properties | Conditions | ||
|---|---|---|---|
| T (°C) | Treatment | ||
| Density (×1000 kg/m3) | 7.7-8.03 | 25 | |
| Poisson's Ratio | 0.27-0.30 | 25 | |
| Elastic Modulus (GPa) | 190-210 | 25 | |
| Tensile Strength (Mpa) | 1158 | 25 | oil quenched, fine grained, tempered at 425°C |
| Yield Strength (Mpa) | 1034 | ||
| Elongation (%) | 15 | ||
| Reduction in Area (%) | 53 | ||
| Hardness (HB) | 335 | 25 | oil quenched, fine grained, tempered at 425°C |
GNEE STEEL GROUP is a manufacturer, stockist, and supplier primarily producing steel plates, steel pipes, steel coils, steel round bars, and other steel products, used in shipbuilding, automotive, decorative, dairy, water, marine, manufacturing, and petrochemical industries. While offering various stocked products, GNEE STEEL GROUP also provides services such as grinding, welding, rolling, stamping, milling, cutting, and drilling, enabling the customization of finished products to meet personalized needs.
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Standard |
Boiler and Pressure Vessel Steel Grades |
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ASTM A516/A516M |
A516 Grade 55 |
A516 Grade 60 |
A516 Grade 65 |
A516 Grade 70 |
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ASTM A517/A517M |
A517 Grade A |
A517 Grade B |
A517 Grade E |
A517 Grade F |
|
A517 Grade H |
A517 Grade P |
A517 Grade Q |
A517 Grade S |
|
|
ASTM A537A537M |
A537 Class 1 |
A537 Class 2 |
A537 Class 3 |
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ASTM A662/A662M |
A662 Grade A |
A662 Grade B |
A662 Grade C |
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EN10028-2 |
P235GH |
P265GH |
P295GH |
P355GH |
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16Mo3 |
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EN10028-3 |
P275NH |
P275NL1 |
P275NL2 |
P355N |
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P355NH |
P355NL1 |
P460NH |
P355NL2 |
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P460NL1 |
P460NL2 |
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GB713 |
Q245R |
Q345R |
Q370R |
18MnMoNbR |
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15CrMoR |
14Cr1MoR |
13MnNiMoR |
12Cr2Mo1R |
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|
12Cr1MoVR |
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GB3531 |
16MnDR |
15MnNiDR |
09MnNiDR |
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DIN 17155 |
15Mo3 |
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GB713 Steel Plates Chemical Composition
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|
Grade
|
C
|
Si
|
Mn
|
P
|
S
|
Cu
|
Ni
|
Cr
|
Mo
|
|
Q245R
|
0.2
|
0.35
|
0.5-1.10
|
0.025
|
0.010
|
0.3
|
0.30
|
0.30
|
0.08
|
|
Q345R
|
0.2
|
0.55
|
1.2-1.70
|
0.025
|
0.010
|
0.3
|
0.30
|
0.30
|
0.08
|
|
Q370R
|
0.18
|
0.55
|
1.2-1.70
|
0.020
|
0.010
|
0.3
|
0.30
|
0.30
|
0.08
|
|
Q420R
|
0.20
|
0.55
|
1.3-1.70
|
0.020
|
0.010
|
0.3
|
0.2-0.5
|
0.30
|
0.08
|
|
15CrMoR
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0.08-0.18
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0.15-0.4
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0.4-0.7
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0.025
|
0.010
|
0.3
|
0.30
|
0.8-1.2
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0.45-0.60
|
|
12Cr1MoVR
|
0.08-0.15
|
0.15-0.4
|
0.4-0.7
|
0.025
|
0.010
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0.3
|
0.30
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0.9-1.2
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0.25-0.35
|
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 ASME material equivalent to P355NL1?
The typical temperature for P355NL2's impact tests is around -20°C (-4°F). What is the asme material equivalent to P355NL1? ASME material equivalent to EN 10028-3 P355NL1 is ASME SA516 Grade 70.
What grade of material is P355NH?
P355NH is a normalised steel grade with a minimum yield strength of 275-460 N/mm² and plates are available ex–stock from our warehouse. The technical specifications are outlined in the data tables below.
What is the yield strength of P355NL2?
355 MPa
P355NL2 is a low temperature steel for the manufacture of tanks, boilers, pressure vessels and heat exchangers with working temperature from -50°C up to 400°C. It is a non-alloy steel with a minimum yield strength of 355 MPa, however, this depends on the dimension or thickness and may vary.
What is the difference between p355 and S355?
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.
Custom Steel Plate Rolling & Cylinder Fabrication | Cost-Effective Solutions From China
Relying on many first-class equipment, such as CNC Shearing machine, Press Brake machine, Straightening machine, Roll Bending machine, Flat Bar Machine, Deburring machine etc, GNEE STEEL could provide various semi-productsand extensive forming services to customers.
GNEE STEEL PROCESSING
1.CTL & SL SERVICE (141 SETS)
Currently, GNEE STEEL has imported manyadvanced CTL/SL equipment from Italy and Korea and could provide customized CTL/SL services from cold rolled stainless steel and carbon steel to hot rolled stainless steel and carbon steel as well as strips and ultra-wide sheet.
CTL FACILITIES
Max Length:16500mm
Max Width:2200mm
Max Thickness:25.4mm
Max Yield Strength:1500Mpa
SL FACILITIES
Max Width:2200mm
Max Thickness:18mm
Max slit Quantity:31
Max Yield Strength:1200Mpa
2.CUTTING SERVICE
GNEE STEEL imported lots of advanced cutting machines from Germany, Sweden, America and Japan, including plasmas cutting machine, water jet cutting machine, laser cutting machine, flame cutting machine and saw machine. In order to meet customers' diversified needs, GNEE STEEL also adopts nest working multi-cutting methods and intensive production to improve production capacity and save costs for the customers.
Laser Cutting Machine
Max Cutting Length:40,000mm
Max Width:4,600mm
Max Thickness:100mm
Flame Cutting Machine
Max Cutting Length:40,000mm
Max Width:8,000mm
Max Thickness:500mm
Plasmas Cutting Machine
Max Cutting Length:30,000mm
Max Width:5,000mm
Max Thickness:100mm
Water-jet Cutting
Max Cutting Length:12,000mm
Max Width:4,010mm
Max Thickness:250mm
3.FORMING SERVICE
Steel Plate Roll Bending
Maximum Rolling Thickness: up to 200mm
Maximum Width: 4200mm
Automatic Bending Machine-Press Brake
Max Bending Capability:3000Ton
Max Bending Length:15,000mm
Expert in Bending High-Strength & Wear-Resistant Steels
Punching Machine
Max Width:3,070mm
Max Thickness:8mm
Max Pressure:250t
BEVELING SERVICE
GNEE STEEL beveling platform has edge milling machine, edge planer, flame / plasma groove cutting machine, flame groove cutting robot, desktop chamfering machine, gantry planerand other advanced equipment to provide customers with parts prefabrication services,daily processing of V-type, Y-type, X-type and U-type grooves, and guarantee subsequent processes such as welding and assembly of products.
Milling：
Max Cutting Length:18,000mm
Max Width:4500mm
Max Thickness:120mm
Beveling:
Max Length:16,000mm
Max Thickness:80mm
MACHINING SERVICE
GNEE STEEL owns CNC Portal-type Boring and Milling machine,CNC Floor-type Boring and Milling machine, Vertical Precision 5-axis Milling Machine, Portal-type Planer, Vertical Lathe, Cylindical Grinding machine, Hydraulic Planer and CNC Lathe and could provide fine machining of large spare parts and structural parts for customers.
Gantry Type Boring & Milling Maching Center
Max Length:48000mm
Max Width:12500mm
Max Height:8000mm
Max Diameter:10500mm
Deep-hole Drilling Equipment
Max Driling Depth:1,100mm
Max Bore Diameter:φ80mm
Max Diametar:φ4,500mm
MMulti-hole Drilling Equipment
Max Length:13,000mm
Max Width:10,000mm
Max Bore Diameter:φ105mm
Max Drilling Depth:250mm
Floor Boring And Milling Machine
Max Length:24,000mm
Max Height:8,000mm
Turntable Dimensions:9x5m
Vertical Lathe
Max Height:6,000mm
Max Diametar:φ22,00mm
Automated Edge Milling Machine
The Automated Edge Milling Machine is a leading product in heavy-duty milling equipment. It is primarily used for weld groove preparation (beveling) on large-format plates made of stainless steel, carbon steel, and special steel grades. It can process plates with a maximum thickness of up to 90mm, a length of 16 meters, and a width of 4 meters.
It is equipped with dual milling units and a fully automatic milling cutter head changing system, enabling automated 4-edge beveling. Its standout feature is the profiling technology used when milling wavy plates and irregularly shaped products, which ensures absolute consistency of the groove after milling.
Utilizing specially designed milling cutter heads, it can execute highly difficult and complex groove profiles in a single pass.
Materials: Plain carbon steel, pressure vessel steel, wear-resistant steel, high-strength steel, stainless steel, nickel-based alloys, etc.
Width: 1200 - 4200 mm
Length: 5800 - 16000 mm
Thickness: 5 - 90 mm
Weight: Up to 35 tons
This edge milling machine is the world's premier automated bevel milling equipment. With its excellent structural design and advanced data algorithms, it achieves full automation from plate detection to the actual milling process, significantly improving processing efficiency while guaranteeing high precision.
- Processing Accuracy
Length accuracy: ±1mm when L < 10m; ±2mm when L > 10m;
Width accuracy: ±1mm;
Diagonal accuracy: ±2mm;
Root face accuracy (blunt edge): ±1mm for Y-grooves; +0.5mm for X-grooves.
- Processing Efficiency
The processing efficiency is more than 10 times that of conventional edge milling or edge planing equipment.
HEAT TREATMENT
Heat Treatment Furnace
Max Furnace Size:36x12x13.5m
Max Rated Temperature:1100℃
Max Loading Capacity:800t
Heat Treatment of Pressure Vessels
Heat Treatment of Mining Equipment
Heat Treatment of Tube Sheet
Heat Treatment of Pressure Vessel Head
Case : Steel Plates Supply for 100,000m³ Full Containment Ammonia Storage Tank Project
GNEE STEEL is currently participating in the procurement phase of a 100,000m³ full containment ammonia storage tank project, supplying high-quality steel plates for critical tank components. Due to the corrosive nature of ammonia and the risk of Ammonia Stress Corrosion Cracking (SCC), the project requires strict metallurgical control of materials according to EN 10028-3 standards.
One of the most important technical requirements of this project is the strict limitation of the actual Yield Strength (Re) for all NL2 grade materials. To prevent SCC risks in ammonia storage environments, the actual yield strength must not exceed 390 MPa, regardless of the nominal values specified in the standard or plate thickness ranges. This requirement places higher demands on steelmaking process control, heat treatment stability, and material testing.
Raw high-strength steel plates ready for the 100,000 m³ full containment ammonia storage tank production
Project Materials and Technical Requirements
The project mainly uses P355NL2 and P275NL2 normalized pressure vessel steel plates, which are widely applied in low-temperature storage tanks due to their excellent toughness and weldability.
Key technical specifications include:
- Material grades: P355NL2 and P275NL2 (Normalized)
- Yield strength: Standard minimum / Maximum limited to 390 MPa
- Hardness: ≤ 225 HBW in base material
- Impact testing: Charpy-V notch test at -50°C, minimum 27J
- Certification: EN 10204 3.1 certificate, with optional 3.2 certification
These strict requirements ensure that the steel plates maintain stable mechanical properties and high resistance to ammonia-induced stress corrosion during long-term operation.
Precision rolling and forming of steel plates into curved sections for the 100,000 m³ ammonia storage tank.
Project Plate Quantities and Thickness Distribution
The total steel demand for this ammonia storage tank project is several thousand tons, mainly distributed across different tank sections:
P355NL2 – Inner & Outer Tank Shell Plates
- Lower shell courses: 50 mm thickness – approx. 2,000 tons
- Middle shell courses: 25 mm thickness – approx. 1,400 tons
- Upper shell courses: 10 mm thickness – approx. 500 tons
P275NL2 – Tank Bottom Plates
- Thickness: 10–15 mm – approx. 750 tons
P275NL2 – Suspended Roof Structure
- Thickness: 5–8 mm – approx. 180 tons
S275JR – Outer Roof (Ambient Structure)
- Thickness: 10 mm – approx. 450 tons
To improve tank fabrication efficiency and reduce circumferential welds, the project also requires wide steel plates to minimize welding joints, which helps reduce the potential risk of SCC in ammonia service conditions.
Formed steel segments wrapped and racked for protection, ready for 100,000 m³ ammonia storage tank assembly.
GNEE STEEL provides high-precision steel plate rolling and cylinder fabrication solutions for tank manufacturers worldwide. Send us your plate specifications or fabrication drawings for a fast quotation.
| TYPE | GRADE | SPECIFICATIONS |
| Carbon Steel / Low Alloy Coil | Q235A/B/C/D/Q355B(Q345B)/C/D/E/SS400/SAPH400-C/ASTMA283Grade C |
0.7~2.0*1250/1500mm*C 2.3~19.5*1250/1500/1800/2000mm*C |
| Medium Heavy Plate | Q235B/Q355B(Q345B)/C/D/E | 6.0-200x150mm-4000mmxL |
| Vessel Plate |
Q245R/Q345R/HP295/SA516MGR485/SA516GR70/P355NL2/P275NL2/ S275JR//SPV490/ASTM A537 Class 1/Class 2 |
2.5-120x1500mm-3000mmxL |
| High Strength Steel |
510L/610L/700L/750L/BS600MCK4/BS700MCK2/BS700MCK4/ BS960E/BWELDY700QL2/L4/BWELDY960QL4/HG60D/70D/785D/ Q460D/Q550D/690D/690E/TQ600MCD/TQ700MCD/S700MCD/ WYS600/700/STRENX700MCE/Q490E/Q490D |
1.2-60x 1500mm-2500mmxL |
| Patterned Steel | HQ235A|B | 1.2-60x 1500mm-2500mmxL |
| Wear-resistance Steel |
NM360/400/450/500/NM300TP/400TP/450TP/ ABREX400/450/500/B-HARD450XKY/ CREUSABRO4800/8000/EH C400LE/450LE/500LE/ |
3.0-50x1250mm-3300mmxL |
| Cold Rolled Coil | DC01/RECC/REDT/SPCC/ST12 | 0.5-3.0x1250mm-1500mmxC |
| Galvanized Plate | DC51D+AZ/DC51D+Z/DX51D+Z/SGH340+Z275/Z275/Z120/S350GD+ZM275 | 0.45-3.0x1250mm-1500mmxC |
| Pickled Coil | DD11/SPHC | 2.0-6.0x1500xC |
Stainless Steel Material and Surface Specifications
| TYPE | GRADE | THICKNESS | SURFACE |
| Austenitic | 304/304H/304L/304J1 | 0.25-150mm | 2B/BA/NO.4/8K/SB/HL/NO.1 |
| Austenitic | 321 | 0.4-80mm | 2B/BA/NO.4/8K/SB/HL/NO.1 |
| Austenitic | 316/316L/317L/316Ti | 0.3-80mm | 2B/BA/NO.4/8K/SB/HL/NO.1 |
| Austenitic | 201(J1/J2/J5) | 0.35-12mm | 2B/NO.1/1D |
| Ferrite | 430 | 0.4-3.0mm | 2B/BA/NO.4/8K/SB/HL |
| Ultra Pure Ferrite | 443 | 0.4-2.0mm | 2B |
| Ultra Pure Ferrite | 436L/439/444/441 | 0.5-3.0mm | 2B/2D |
Special Steel / Nickel Base Alloy
| TYPE | GRADE | GRADE (ASTM) | GRADE (EN) | THICKNESS |
| Heat-resistant Steel | 309S | S30908 | 1.4833 | 0.5-40mm |
| Heat-resistant Steel | 310S | S31008 | 1.4845 | 0.5-40mm |
| Duplex Stainless Steel | 2101 | S32101 | 1.4162 | 1.5-50mm |
| Duplex Stainless Steel | 2304 | S32304 | 1.4362 | 3.0-50mm |
| Duplex Stainless Steel | 2205 | S32205/S31803 | 1.4462 | 0.5-60mm |
| Duplex Stainless Steel | 2507 | S32750 | 1.4410 | 1.0-60mm |
| Super Austenitic-Steel | 904L | N08904 | 1.4539 | 0.6-50mm |
| Super Austenitic-Steel | 254SMO | S31254 | 1.4547 | 0.5-50mm |
| Super Austenitic-Steel | 1.4529 | N08926 | 1.4529 | 0.5-50mm |
| Super Austenitic-Steel | AL-6XN | N08367 | 1.4478 | 0.5-50mm |
| Nickel Base Alloy | Alloy 31 | N08031 | 1.4562 | 1.0-50mm |
| Nickel Base Alloy | 800 | N08800 | 1.4876 | 0.8-50mm |
| Nickel Base Alloy | 800H | N08810 | 1.4958 | 0.8-50mm |
| Nickel Base Alloy | 800HT | N08811 | 1.4959 | 0.8-50mm |
| Nickel Base Alloy | Alloy 28 | N08028 | 1.4563 | 1.0-20mm |
| Nickel Base Alloy | Alloy 20 | N08020 | 2.4660 | 1.0-20mm |
| Nickel Base Alloy | 825 | N08825 | 2.4858 | 0.8-40mm |
| Nickel Base Alloy | C276 | N10276 | 2.4819 | 0.5-50mm |
| Nickel Base Alloy | C22 | N06022 | 2.4602 | 1.0-50mm |
| Nickel Base Alloy | 625 | N06625 | 2.4856 | 0.8-20mm |
| Nickel Base Alloy | 400 | N04400 | 2.4360 | 1.0-20mm |
| Nickel Base Alloy | 600 | N06600 | 2.4816 | 1.0-50mm |
| Nickel Base Alloy | Pure Ni 201 | N02201 | 2.4061 | 0.5-20mm |
| Titanium | TA1 | Gr.1 | Class 1 | 0.5-50mm |
| Titanium | TA2 | Gr.2 | Class 2 | 0.5-50mm |
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We have enough P355NL1 P355NL2 Boiler Plate in stock, and we can also customize it according to your needs.
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