ASTM A387 Grade 22 (ASME SA387 Grade 22) is Chrom-Moly steel plate used for making boilers and pressure vessles designed for high temperature high pressure serivce, chrome content at 2.00% to 2.50%, and Moly 0.90% to 1.10% for SA387 GRADE 22 material.
The more content of chromium will provide better corrosion and oxidation resistance, ASTM A387 Grade 22 / ASME SA387 Grade 22 material could be used storage oil, gas, or other liquid for industries, and also compatible with sour services.
Key Properties:
- Composition: ASTM A387 Grade 22 typically contains around 2.25% molybdenum and 1% chromium, enhancing its strength and resistance to oxidation at high temperatures.
- Mechanical Properties: This grade offers excellent mechanical properties, making it suitable for use in environments subject to high stress and pressure.
Applications:
ASTM A387 Grade 22 steel plates are commonly used in:
- Pressure vessels for the oil and gas industry
- Heat exchangers
- Boilers
- Power generation equipment
- Chemical processing plants
Overall, ASTM A387 Grade 22 steel plates are crucial for applications requiring durability and performance in high-temperature and high-pressure environments.
Refered Standards for ASTM A387 Grade 22 CL1, CL2
ASTM
A20/A20M: General requirements for pressure vessel plates.
A370: Test specification for mechanical properties of steel
A435/A435M: For straight-beam ultrasonic examination of steel plates
A577/A577M: For ultrasonic angle beam examination of steel plates
A578/A578M: For straight beam UT examination of rolled steel plates in special applications
A1017/A1017M: Specification for pressure vessle plates of alloy steel, chromium-molybdenum-tungsten
AWS Specification Welding Methods
A5.5/A5.5M: Low alloy steel electrodes for shield metal arc welding.
A5.23/A5.23M: Low alloy steel electrodes for fulxes for submerged arc welding.
A5.28/A5.28M: For gas shielded arc welding
A5.29/A5.29M: For flux cored arc welding.
ASTM A387/ ASME SA387 Grade 22 Chemical Composition
Grade | Nominal Chromium Content, % | Nominal Molybdenum Content, % |
|---|---|---|
11 | 1.25 | 0.50 |
22, 22L | 2.25 | 1.00 |
5 | 5.00 | 0.50 |
9 | 9.00 | 1.00 |
91 | 9.00 | 1.00 |
Except 21L, 22L and 91, each grade is available in two classes of tensile strength levels as defined in the tensile requirements tables. Grades 21L and 22L only has Class 1, and Grade 91 only has Class2.
Heat Treatment for ASME SA387 Grade 22 CL1, CL2
Chrome moly alloy steel plate under ASTM A387 shall be killed steel, with thermally treated either by annealing, normarlizing and tempering. Or in case agreed by buyer, accelerated cooling from the austenitizing temperature by air blasting or liquid quenching, followed by tempering, minimum tempering temperatures shall be as below table:
Grade | Temperature, °F [°C] |
|---|---|
2, 12 and 11 | 1150 [620] |
22, 22L, 21, 21L and 9 | 1250 [675] |
5 | 1300 [705] |
Comparison between ASTM A387 Grade 11 and Grade 22:
Composition:
- Grade 11: Contains approximately 1% chromium and 0.5% molybdenum.
- Grade 22: Contains about 2.25% molybdenum and 1% chromium. This higher molybdenum content enhances its strength and resistance to high temperatures.
Mechanical Properties:
- Grade 11:
- Minimum yield strength: 205 MPa (30,000 psi)
- Minimum tensile strength: 415 MPa (60,000 psi)
- Grade 22:
- Minimum yield strength: 240 MPa (35,000 psi)
- Minimum tensile strength: 550 MPa (80,000 psi)
Applications:
- Grade 11: Primarily used in applications requiring moderate strength at elevated temperatures, such as in boilers and pressure vessels.
- Grade 22: Typically used in more demanding applications where higher strength and resistance to creep are needed, including in power generation and chemical processing systems.
Summary:
The main differences between ASTM A387 Grade 11 and Grade 22 lie in their composition, mechanical properties, and intended applications. Grade 22 generally offers better performance under high temperatures and stress due to its higher molybdenum content, making it suitable for more critical applications compared to Grade 11.
Our Supply Range:
Description: Chrome Moly Alloy Steel Plate ASME SA387/ ASTM A387
Grade: A/SA387 GRADE 11, 22, 12, 5, 9, 91
Manufacturing Types: Hot Rolled, Heat Treated
Thickness: 5 to 150 mm
Width: 0.6m to 3m
Length: 6m, 12m, customized
Surface: Natural, Painted
Packing: Standard sea packing, bundled with streel strip.
Customized cutting: Laser Cut, Plasma Cut, CNC Cut.
Related Products
ASTM A387 Grade 11, 22, 91 Plate
ASTM A537 Class 1, 2 Plates
ASTM A572 Grade 50, 60 Steel Plates
Laser Cut Metal Steel / CNC Laser Cutting
