What is ASME SA387 Gr.22?
For critical high-temperature pressure equipment, material selection determines long-term operating safety. GNEE Steel supplies SA387 Gr.22 plates with strict quality control and complete inspection documentation to support global pressure vessel manufacturers.
Why Choose SA387 Gr.22 for High Temperature Pressure Vessel Applications?
Elevated-Temperature Strength
For pressure vessels operating under continuous high-temperature, high-pressure conditions, maintaining strength at elevated temperatures is paramount. Compared to conventional carbon steel pressure vessel plates, the Cr-Mo alloy matrix of ASME SA-387/SA-387M Grade 22 significantly enhances its retention of mechanical strength during long-term, elevated-temperature service.
Oxidation and High-Temperature Corrosion Resistance
High-temperature process gases
Hydrogen service
Refining and chemical processing conditions
Creep Resistance and Long-Term Structural Stability
In high-pressure equipment, materials are subjected to sustained stresses over tens of thousands of operational hours. The addition of molybdenum (0.90%–1.10% Mo) enhances the elevated-temperature microstructural stability of ASME SA-387/SA-387M Grade 22 and substantially bolsters its creep-rupture resistance. The Cr-Mo alloying system ensures that the steel maintains:
A stable metallurgical structure
Reliable mechanical properties at elevated temperatures
Long-term serviceability in pressure vessel applications
SA387 Gr.22 High Temperature High Pressure Vessel Steel Mechanical Property
| Property | SA387 Gr.22 Class 1 | SA387 Gr.22 Class 2 |
|---|---|---|
| Tensile Strength | 415–550 MPa (60–80 ksi) | 515–655 MPa (75–95 ksi) |
| Yield Strength (Min.) | 255 MPa (37 ksi) | 310 MPa (45 ksi) |
| Elongation (Min.) | 21% | 18% |
SA387 Gr.22 High Temperature High Pressure Vessel Steel Chemical Composition
|
Element |
Analysis |
Chemical Composition (%) inc. Grade & UNS No. |
|
Grade 22 (UNS: K11757) |
||
|
Carbon: |
Heat Analysis: |
0.05 - 0.15 |
|
Manganese: |
Heat Analysis: |
0.30 - 0.60 |
|
Phosphorus: |
Heat Analysis: |
0.035 |
|
Sulphur (max): |
Heat Analysis: |
0.035 |
|
Silicon: |
Heat Analysis: |
0.50 max |
|
Chromium: |
Heat Analysis: |
2.00 - 2.50 |
|
Molybdenum: |
Heat Analysis: |
0.90 - 1.10 |
SA387 Gr.22 High Temperature High Pressure Vessel Steel Specification
|
Product Name |
SA387 Gr.22 High Temperature High Pressure Vessel Steel |
|
Material |
ASME SA387Gr.11CL1/CL2; ASME SA387Gr.22CL2 |
|
Thcikness |
6~130mm as Required |
|
Width |
1500~4100mm as Required |
|
Length |
3000~12000mm as Required |
|
Tolerance |
1% |
|
Standard |
ASTM A387/ASME SA387 |
|
Technique |
Hot Rolled |
|
Delivery |
30~40 days |
Manufacturing Process of SA387 Gr.22 High Temperature High Pressure Vessel Steel
The manufacturing process of ASME SA 387 Gr.22 steel plates primarily consists of steelmaking, continuous casting, rolling, and heat treatment.
01
Steelmaking
In the steelmaking process, electric arc furnaces or basic oxygen converters are utilized to ensure the cleanliness of the molten steel and the accuracy of its chemical composition.
02
Continuous Casting
In the continuous casting stage, continuous casting machines are used to cast the molten steel into slabs, followed by surface conditioning and defect rectification.
03
Rolling
In the rolling stage, depending on the requirements of different specifications, the slabs undergo multi-pass rolling to achieve the required geometry and dimensions.
04
Heat Treatment
In the heat treatment stage, heating and cooling processes are employed to adjust the internal microstructure of the steel, thereby achieving the required mechanical properties and corrosion resistance.
Key Uses of SA387 Gr.22 High Temperature High Pressure Vessel Steel
Petrochemical Industry
Hydrogen reactors
Heat exchangers
Separators
Reactor vessels
Oil Refining Equipment
Hydrocracking units
Desulfurization equipment
Power Generation
Boilers
Steam equipment
Chemical Industry
High-temperature reaction vessels
Why Choose us?
Strict Quality Control and Complete Documentation
Every SA387 Gr.22 steel plate is manufactured under a comprehensive quality control system and supplied with complete inspection documentation for full traceability.
Available quality documents include:
- Mill Test Certificate (EN 10204 3.1)
- Chemical composition report
- Mechanical property test report
- Heat treatment records
- Ultrasonic Testing (UT) reports (when specified)
- Third-party inspection certificates from organizations such as SGS, TÜV, BV, or DNV, upon request
Each plate is traceable by heat number, ensuring full material identification throughout production and delivery.
Customized Processing and Flexible Supply
To help customers reduce fabrication time and improve production efficiency, GNEE Steel offers a range of value-added processing services in addition to supplying raw steel plates.
Our customized services include:
- Customized plate dimensions and thickness
- CNC flame cutting and profile cutting
- Edge preparation for welding
- Surface cleaning and shot blasting (upon request)
- Marking and packaging according to project requirements
These services enable customers to receive steel plates that are ready for downstream fabrication, reducing additional processing costs.
FAQ
Q: What is the ASTM A387 Grade 22 equivalent to?
A: ASTM A387 Grade 22 is a chromium-molybdenum alloy steel plate for boilers and pressure vessels. Its primary global equivalents include ASME SA387 Grade 22 (United States), EN 10CrMo9-10 / 1.7380 (Europe), and BS 1501 622-515 / 622-540 (United Kingdom).
Q: How to choose between ASME SA387 Gr.22 Cl1 and Cl2?
A: Both ASME SA387 Gr. 22 Classes 1 and 2 share identical chemical compositions (2.25% Chromium and 1% Molybdenum). They differ only in their heat treatment, mechanical strength, and recommended operating conditions. Choose between them based primarily on your structural and pressure requirements.
Q: What are the main diferences of SA387 Gr.11, Gr.12 and Gr.22?
A: ASME SA-387 Grades 11, 12, and 22 are chromium-molybdenum alloy pressure vessel steels designed for elevated temperatures. The primary difference lies in their chromium and molybdenum content. Grade 12 uses 1% Cr and 0.5% Mo, Grade 11 uses 1.25% Cr and 0.5% Mo, while Grade 22 uses a higher alloy blend of 2.25% Cr and 1% Mo.
