SA387 Gr.22 Cl2 is a unique steel produced using different standards and specifications. This steel can be processed into a variety of end products, including steel plates for industrial boilers, welded boilers, and pressure vessels. SA387 Gr.22 Cl2 steel plates contain 2.25% chromium and 1% molybdenum. This chromium-molybdenum steel plate performs effectively at a wide range of temperatures and consistently maintains optimal performance.
GNEE Steel offers a wide range of SA387 Gr.22 Cl2 steel plates in various sizes and thicknesses, available to any destination worldwide. All our SA387 Gr.22 Cl2 steel plates come with factory certification and a stamp. We can supply custom SA387 Gr.22 Cl2 alloy steel materials to your needs, in the right time, in the right quantity, and at the right location. We have many years of experience supplying pressure vessel plates.
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Excellent Weldability of ASME SA387 Gr.22 Cl2
With precisely controlled chemical composition and heat treatment, ASME SA387 Gr.22 Cl2 features an optimized carbon equivalent and extremely low susceptibility to hot and cold welding cracks. It is compatible with mainstream industrial welding processes including GTAW, SAW and SMAW, offering excellent fabrication adaptability. The welded joints maintain mechanical properties consistent with the base metal, with the joint tensile strength reaching a minimum of 500 MPa and toughness degradation controlled below 10%. The joints are free of pores, cracks, inclusions and other defects, achieving a qualification rate of over 99%.
Compared with conventional alloy steels, ASME SA387 Gr.22 Cl2 provides higher tolerance during welding fabrication, effectively shortening welding cycles and reducing labor and rework costs.
Superior High-Temperature Performance of ASME SA387 Gr.22 Cl2
Featuring a 2.25Cr-1Mo alloy composition, ASME SA387 Gr.22 Cl2 delivers exceptional high-temperature strength, thermal stability and creep resistance. It can operate stably over a long period at a continuous service temperature of up to 550°C without thermal deformation, strength deterioration or material aging. Under constant load at 500°C, the material sustains a stress rupture strength exceeding 300 MPa with reliable creep performance. Its dimensional accuracy and mechanical property retention remain above 95% after long-term high-temperature service.
Corrosion and Hydrogen Resistance of ASME SA387 Gr.22 Cl2
High chromium and molybdenum contents form a dense, stable passivation film on the steel surface, providing robust resistance to various industrial corrosive media. In addition, it offers superior sulfide corrosion resistance, with a corrosion rate of ≤0.05 mm/a in H₂S and mercaptan-containing corrosive media - far lower than the 0.2–0.3 mm/a corrosion rate of conventional carbon steel.
ASME SA387 Gr.22 Cl2 is suitable for long-term service in harsh environments, including high-temperature hydrogen service, sulfur-bearing oil and gas, and acid-base corrosive conditions. Equipment fabricated from this steel achieves a service life 2 to 3 times longer than that of ordinary pressure vessel steels. It substantially reduces maintenance frequency, corrosion protection costs and shutdown losses, and greatly extends the overall service life of pressure equipment.
Low-Temperature Toughness of ASME SA387 Gr.22 Cl2
Unlike most high-temperature alloy steels that suffer from severe brittleness at low temperatures, ASME SA387 Gr.22 Cl2 maintains stable low-temperature impact toughness with consistent microstructure, avoiding drastic toughness drop and brittle transition. It retains a KV2 impact energy of over 20 J at -20°C, effectively resisting medium impact, structural stress and alternating thermal stress under low-temperature conditions with no risk of low-temperature cracking or brittle fracture.
This property enables the material to serve in cold-region outdoor installations, low-temperature start-stop cycles and facilities with frequent thermal cycling, ensuring stable operation across high, ambient and low temperature ranges. It effectively addresses the inherent limitations of traditional high-temperature steels, namely poor low-temperature performance and narrow operational adaptability, expanding application scope and significantly improving equipment operational safety.
SA387 Gr.22 Cl2 Pressure Vessel Plate Mechanical Property
ASME SA387 Grade 22 Class 2 steel is designed for pressure vessels operating in high-temperature, high-pressure environments; subjected to Normalizing and Tempering (N+T) heat treatment, it offers higher strength than Class 1 steel. Although both classes share the same 2.25Cr-1Mo chemical composition, Class 2 steel exhibits superior mechanical properties, making it better suited for equipment subject to higher design stresses.
| Item | Value (t ≤ 50 mm) |
|---|---|
| Tensile strength | 515–690 MPa |
| Yield strength, min | 310 MPa |
| Elongation, min | 18% |
SA387 Gr.22 Cl2 Pressure Vessel Plate Specification
| Item | Specification |
|---|---|
| Product Name | ASME SA387 Grade 22 Class 2 Pressure Vessel Steel Plate |
| Equivalent Standard | ASTM A387 Grade 22 Class 2 |
| Steel Type | Chromium-Molybdenum (2.25Cr-1Mo) Alloy Steel |
| Delivery Condition | Normalized and Tempered (N+T) |
| Available Thickness | 6–250 mm (1/4"–10") |
| Available Width | 1,000–4,000 mm |
| Available Length | 3,000–18,000 mm |
| Plate Shape | As-Rolled Flat Plate |
| Surface Finish | Hot Rolled, Shot Blasted & Primed (Optional) |
| Density | 7.85 g/cm³ |
| Material Grade | Grade 22 Class 2 |
| Typical Applications | Hydrocrackers, Hydroprocessing Reactors, Heat Exchangers, Boilers, Steam Drums, Pressure Vessels, Petrochemical Equipment, High-Temperature Piping |
SA387 Gr.22 Cl2 Pressure Vessel Plate Chemical Composition
|
SA387 Gr.22 CL.2Chemical Composition |
|||||||
|
Grade |
The Element Max (%) |
||||||
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
|
|
SA387 Gr.22 Cl.2 |
0.04-0.15 |
0.50 |
0.30-0.60 |
0.035 |
0.035 |
1.88-2.62 |
0.85-1.15 |
SA387 Gr.22 Cl2 Pressure Vessel Plate Production Process
| Production Stage | Description |
|---|---|
| 1. Raw Materials | High-quality scrap steel, pig iron and hot metal are selected to ensure stable chemical composition. |
| 2. Electric Arc Furnace (EAF) Steelmaking | Molten steel is produced using an ultra-high-power electric arc furnace with strict control of melting temperature and composition. |
| 3. Ladle Furnace (LF) Refining | Secondary refining adjusts alloy composition and improves steel cleanliness. |
| 4. Vacuum Degassing (VD/VOD) | Removes dissolved hydrogen, oxygen and nitrogen, improving internal quality and reducing gas-related defects. |
| 5. Continuous Casting / Ingot Casting | Produces high-quality slabs or ingots for subsequent rolling. |
| 6. Reheating | Steel slabs are reheated to the required rolling temperature to ensure uniform deformation. |
| 7. Hot Rolling | Plates are rolled on 4100 mm or 4200 mm heavy plate mills to achieve the specified dimensions and mechanical properties. |
| 8. Heat Treatment | Class 1: Normalized (N) Class 2: Normalized & Tempered (N+T). Heat treatment refines the microstructure and optimizes mechanical properties. |
| 9. Plate Cutting & Final Inspection | Plates are cut to the required dimensions and undergo dimensional and visual inspection before shipment. |
| 10. Warehousing | Finished plates are stored with full heat-number traceability for efficient inventory management and delivery. |
SA387 Gr.22 Cl2 Pressure Vessel Plate Delivery Condition and Heat Treatment
Delivery Condition
Our ASME SA387 Gr.22 Class 2 steel plates are normally supplied in the normalized and tempered (N&T) condition. Normalizing refines grain structure to increase the strength and toughness of plates. Tempering lowers hardness, improves ductility and toughness, and relieves residual stress generated during normalizing.
Heat Treatment Temperatures
Normalizing temperature shall not exceed 968 °C, and tempering temperature shall not be lower than 720 °C. This temperature window is precisely engineered to ensure plates achieve optimum mechanical properties after heat treatment.
Simulated Post-Weld Heat Treatment (SPWHT)
All plates shall be subjected to simulated post-weld heat treatment during manufacturing to enhance their overall mechanical performance.
The specified SPWHT procedure is as follows:
Maximum simulated PWHT cycle: 690±14 °C for 26 hours
Minimum simulated PWHT cycle: 690±14 °C for 2 to 8 hours
SA387 Gr.22 Cl2 Pressure Vessel Plate Applications
SA387 Gr. 22 Cl. 2 is widely used in industries such as petroleum, chemicals, power generation, and boiler manufacturing. It is utilized to fabricate equipment and components including reactors, heat exchangers, separators, spherical tanks, gas holders, liquefied gas tanks, nuclear reactor pressure vessels, boiler drums, LPG cylinders, high-pressure penstocks for hydroelectric plants, and turbine spiral casings.
Why Choose GNEE Steel?
Strict Quality Inspection
Quality is the foundation of every pressure vessel steel plate we supply. Each ASME SA387 plate undergoes inspection in accordance with the applicable standards and customer specifications before delivery.
Available inspection documents include:
EN 10204 3.1 Mill Test Certificate (MTC)
Chemical Composition Report
Mechanical Property Test Report
Ultrasonic Testing (UT), when specified
Third-Party Inspection or customer-designated agencies
Complete documentation ensures full material traceability and compliance with project requirements.
Customized Supply Solutions
To meet the diverse requirements of pressure vessel projects, GNEE Steel provides flexible customization services.
Available options include:
Custom plate thickness, width, and length
Cut-to-size plates
Flame cutting and profile cutting
Customized heat treatment (subject to applicable standards and customer requirements)
Our team works closely with customers to deliver steel plates tailored to their engineering drawings and fabrication needs.
Professional Export Packaging
All products are packed using seaworthy export packaging to ensure safe transportation and long-term protection.
Packaging options include:
Steel strapping
Wooden pallets or supports
Moisture-proof protection (upon request)
Clear product identification and heat number marking
Packaging can also be customized according to customer specifications or project requirements.
Global Logistics Support
With extensive export experience, GNEE Steel provides reliable logistics solutions for customers worldwide.
Our logistics services include:
Container and bulk vessel shipments
Flexible delivery arrangements
Export documentation support
Timely shipment coordination
From production to final delivery, we strive to ensure every order arrives safely and on schedule.
Ordering requirements for SA387 Gr. 22 Cl. 2 steel plates
Steel plates supplied under this standard shall conform to the requirements of the A20/A20M standard. These requirements cover testing and retesting methods and procedures, permissible variations in dimensions and weight, quality and defect repair, marking, loading, and ordering information.
In addition to the basic requirements specified in this standard, supplementary requirements may be applied when further controls, tests, or inspections are necessary to meet end-use requirements. The purchaser should consult the supplementary requirements listed in this standard and the detailed requirements in the A20/A20M standard.
In the event of a conflict between the requirements of this standard and those of the A20/A20M standard, the requirements of this standard shall prevail.
FAQ
Q: What is the equivalent steel grade for SA387 Gr.22 Cl.2?
A: The most common global equivalents for ASME SA387 Gr. 22 Cl. 2 (a 2.25% Chromium - 1% Molybdenum alloy steel used for pressure vessels) are the European standard 10CrMo9-10 (EN 10028-2) and the British standard BS 1501 Grade 622-515B.
Q: Which offers better high-temperature performance: SA387 Gr.22 Cl.2 or SA387 Gr.11 Cl.2?
A: SA387 Grade 22 Class 2 offers significantly better high-temperature performance. It contains higher levels of molybdenum and chromium than Grade 11, allowing it to maintain greater tensile strength, improved creep resistance, and higher structural stability under continuous stress at elevated temperatures.
Q: What are the differences between SA387 Gr.22 Cl.2 and SA387 Gr.91 Cl.2?
A: ASME SA387 Gr. 22 Cl. 2 and Gr. 91 Cl. 2 are both chromium-molybdenum alloy steel plates intended for high-temperature and pressure service in boilers and pressure vessels. The primary differences are that Gr. 91 Cl. 2 contains 9% Chromium and added Vanadium for superior creep strength, while Gr. 22 Cl. 2 relies on 2.25% Chromium.
Q: What are the shared advantages of SA387 Gr.22 Cl.2 and Cl.1?
A: Since SA387 Gr.22 Cl.1 and Cl.2 share identical chemical compositions (containing 2.25% chromium and 1% molybdenum), they possess the same fundamental material advantages for withstanding high-temperature and corrosive environments.
