ASME SA537 CL.2 Bolier Pressure Vessel
A537CL2 is the American Standard pressure vessel with heat-treated carbon-manganese silicon steel plate, divided into three levels, respectively, A537CL1, A537CL2, A537CL3. sometimes also written or read as SA537CL1, SA537CL2, SA537CL3, SA is the ASME standard in the writing of the S that the ASME, A that the ferrous metal, with the ASTM is much the same. ASTM is similar.
We can supply SA537 CL.2 and other pressure vessel steel plate, we have many sizes in stock, if you have purchasing requirement, please contact us!
Understanding the Superiority of ASME SA537 CL.2 Boiler Pressure Vessel Steel
The ASME SA537 CL.2 Boiler Pressure Vessel specification covers heat-treated, carbon-manganese-silicon steel plates intended for fusion-welded pressure vessels and structures. What sets Class 2 apart from Class 1 is the specific heat treatment process. While Class 1 is normalized, Class 2 undergoes Quenching and Tempering (Q&T). This specialized process significantly enhances the yield and tensile strength of the material, making it an ideal choice for high-stress environments.
In modern power generation and chemical processing, a ASME SA537 CL.2 Boiler Pressure Vessel plate must withstand extreme internal pressures and temperature fluctuations. GNEE's production line ensures that each plate achieves a uniform fine-grain structure, which is essential for preventing brittle fractures in pressurized systems. By choosing GNEE, you are partnering with a manufacturer that understands the critical safety implications of pressure vessel integrity.
Premium ASME SA537 CL.2 steel plates ready for shipment at the GNEE facility
Key Technical Features of ASME SA537 CL.2 Boiler Pressure Vessel Plates
When engineers specify ASME SA537 CL.2 Boiler Pressure Vessel steel, they are looking for a balance of high strength and excellent weldability. The Quenched and Tempered state allows for thinner plate designs without compromising the structural safety of the boiler or tank. This weight reduction can lead to significant cost savings in transport and assembly.
- Higher Yield Strength: Class 2 offers a minimum yield strength of 415-418 MPa (depending on thickness), significantly higher than standard carbon steels.
- Enhanced Impact Toughness: Our plates are tested at low temperatures to ensure they remain ductile and safe even in harsh climates.
- Superior Weldability: Despite its high strength, the chemical composition is optimized for fusion welding, reducing the risk of cold cracking during fabrication.
At GNEE, we provide additional value-added services such as ultrasonic testing (UT), Z-direction testing (Z15, Z25, Z35), and HIC (Hydrogen Induced Cracking) resistance testing to ensure your ASME SA537 CL.2 Boiler Pressure Vessel exceeds standard industry expectations.
SA537 CL.2 Boiler Plate Steel chemical composition
| C | Mn | P | S | Si | Cr | Cu | Ni | Mo | |
| ≤ 40 mm | > 40 mm | ||||||||
| 0.24 max | 0.70/1.35 | 1.00/1.60 | 0.035 | 0.035 | 0.15/0.50 | 0.025 | 0.35 | 0.25 | 0.080 |
SA537 CL.2 pressure vessel plate mechanical property
|
Class |
Heat |
Thickness |
Yield |
Tensile |
|---|---|---|---|---|
|
Class 2 |
Quenched and tempered |
21/2 inch and under [65 mm and under] |
60 ksi |
80 ksi |
|
|
|
Over 21/2 to 4 inch |
55 ksi |
75 ksi |
|
|
|
Over 4 inch |
46 ksi |
70 ksi |
SA537 CL.2 pressure vessel steel plate Thermal coefficient
| Heat Treatment | Class | Yield Strength, ksi [MPa], min | Thickness | Tensile Strength, ksi [MPa], min |
| 4 | 40 [275] | Over 4 - 6 inch[Over 100mm - 150 mm] | 70 [485] | |
| Quenched & tempered | 2 | 60 [415] 55 [380] 46 [315] |
Over 21/2 - 4 inch [Over 65mm - 100 mm] under [65 mm and under] and 21/2 inch Over 4 - 6 inch [Over 100mm - 150 mm] |
75 [515] 80 [550] 70 [485] |
| Normalized | 1 | 50 [345] 45 [310] |
Over 21/2 to 4 inch [Over 65mm - 100 mm] under [65 mm and under] and 21/2 inch |
70 [485] 65 [450] |
| Quenched and tempered | 3 | 50 [345] 55 [380] |
[Over 65mm - 100 mm] Over 21/2 - 4 inch under [65 mm and under] and 21/2 inch |
80 [550] 75 [515] |
Diverse Applications in the Energy and Chemical Sectors
The application of ASME SA537 CL.2 Boiler Pressure Vessel steel is vast, primarily found in industries where safety and high-pressure containment are non-negotiable. Because GNEE's steel maintains its mechanical integrity under high load, it is frequently utilized in:
- Industrial Boilers: High-pressure steam boilers used in power plants require the superior heat resistance of SA537 Class 2.
- Storage Tanks: Large-scale storage spheres for liquefied gases (LPG/LNG) benefit from the material's impact toughness.
- Petrochemical Reactors: The resistance to deformation at high pressures makes it a staple in refinery vessel construction.
- Heat Exchangers: Our plates provide the durability needed for the rigorous cycling of heat exchange systems.
As a manufacturer with a global footprint, GNEE ensures that our ASME SA537 CL.2 Boiler Pressure Vessel plates are delivered with full Mill Test Certificates (MTC) according to EN10204 3.1 or 3.2, ensuring total traceability for your project documentation.
Why GNEE is the Trusted Choice for Pressure Vessel Steel
Choosing the right partner for your ASME SA537 CL.2 Boiler Pressure Vessel needs involves more than just comparing prices. It involves verifying the manufacturer's capability to deliver consistent quality. At GNEE, we take pride in our massive inventory, allowing for shortened lead times on standard sizes. Our logistics team is experienced in international sea freight, ensuring that your steel arrives in perfect condition, protected by sea-worthy packaging.
We understand that every project has unique requirements. Whether you need custom cutting, beveling, or specific Charpy V-notch impact testing, our technical team is available to provide tailored solutions. Our reputation as a reliable ASME SA537 CL.2 Boiler Pressure Vessel manufacturer is built on transparency, quality, and an unwavering commitment to our clients' success.
Conclusion: Partner with GNEE for Your ASME SA537 CL.2 Needs
In the demanding world of industrial fabrication, the quality of your ASME SA537 CL.2 Boiler Pressure Vessel steel is the foundation of your equipment's safety and longevity. GNEE's high-strength, Quenched and Tempered plates provide the ultimate solution for manufacturers seeking to optimize performance while maintaining the highest safety standards. From our factory floor to your project site, we ensure excellence at every step of the supply chain.
Don't compromise on your project's integrity. Contact GNEE today to discuss your ASME SA537 CL.2 Boiler Pressure Vessel requirements. Our experts are standing by to provide you with a comprehensive quote and technical support.
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We have enough Bolier Pressure Vessel ASME SA537 CL.2 in stock, and we can also customize it according to your needs.
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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