ASME SA387 Grade 11 Class 2 (ASTM A387 Grade 11 CL2) is a specification for chromium-molybdenum alloy steel plates intended for use in elevated temperature applications, commonly associated with pressure vessels and heat exchangers. Nominal chrome content at 1.00% to 1.50%, and Moly 0.45% to 0.65% for SA387 GRADE 11 material.
Key Properties:
- Composition: ASME SA387 Grade 11 typically contains about 1% chromium and 0.5% molybdenum. This composition provides good strength and resistance to oxidation at high temperatures.
- Mechanical Properties:
- Yield Strength: Minimum of 205 MPa (30,000 psi)
- Tensile Strength: Minimum of 415 MPa (60,000 psi)
- Class 2: This classification indicates that the material has undergone additional heat treatment, enhancing its properties compared to Class 1, which may not have the same level of treatment. Class 2 is intended for applications requiring greater performance under higher stress and temperature conditions.
Applications:
ASME SA387 Grade 11 Class 2 is commonly used in:
- Pressure vessels in the oil and gas industry
- Boilers
- Heat exchangers
- Pipelines and other equipment operating at elevated temperatures
The higher content of chromium will provide excellent corrosion and oxidation resistance, so the material could be used for sour services, and to storage oil, gas, liquid for different industries.
Refered Standards for ASTM A387 Alloy Steel Plate
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
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.
SA387 Grade 11, 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 11 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] |
Our Supply Range:
Description: Chrome Moly Alloy Steel Plate ASME SA387
Grade: 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
