ASTM A387 Grade 22 Class 2
ASTM A387 Grade 22 Class 2 is a grade of chromium-molybdenum alloy intended primarily for use fabricators in welded boilers and pressure vessels which are designed for use in raised temperature service.
With excellent heat resistance and anti corrosive/oxidation qualities, this steel grade is ideal for use in the chemical, oil and gas industry.
ASTM A387 Gr 22 CL 2 is a chromium molybdenum alloy steel plate intended primarily for welded boiler and pressure vessels designed of elevated temperature service. The Cr content 2.25 % and the Mo content 1.00 %.
The A387 Grade 22 Class 2 – a grade of chromium-molybdenum alloy – is mainly intended for use in pressure vessels and welded boilers, which are designed for use in elevated temperature service.
This steel grade has excellent heat resistance and anti corrosive/oxidation qualities, and is perfect for using in the oil, gas and chemical industry.
ASTM A387 grade 22 class 2 is ASTM A387 grade 22 steel in the normalized and tempered condition.
STEEL DIMENSION:
Thickness: 6MM to 300MM,
Width: 1500mm to 4050mm,
Length: 3000mm to 15000mm
Key Characteristics:
Composition: Contains ~2.25% Chromium (Cr) and ~1.00% Molybdenum (Mo).
Application: Ideal for high-temperature applications like boilers, heat exchangers, and pressure vessels in refineries and power plants.
Properties: Good weldability, superior high-temperature strength, and corrosion/oxidation resistance.
Condition: Always supplied in normalized and tempered condition.
Class 2 vs. Class 1: Class 2 has higher tensile strength (75-100 ksi) than Class 1 (60-85 ksi), making it suitable for more demanding high-stress applications.
Application
-Oil & Gas Refineries
-Chemical Processing Plants
-Power Generation Equipment
-Heat Exchangers
Equivalents for ASTM A387 Grade 22 Alloy Steel Plates
| BS | EN | ASTM/ASME | DIN |
| 622-515B | 10 CRMO910 | A387-22-2 |
10 CRMO910
|
Chromium & Molybdenum content (according to the ASTM specification):
| Designation | Nominal Chromium Content (%) | Nominal Molybdenum Content (%) |
|---|---|---|
| A387 Grade 22 | 2.25% | 1.00% |
Tensile Requirements for Class 2 Plates
| Designation | Requirement | Grade 22 |
|---|---|---|
| A387 Grade 22 | Tensile strength, ksi [MPA] | 75 to 100 [515 to 690] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 45 [310] | |
| Elongation in 8 in. [200mm], min % | ||
| Elongation in 2 in. [50mm], min, % | 18 | |
| Reduction of area, min % | 45 (measured on round specimen) 40 (measured on flat specimen) |
Chemical Requirements
| . | . |
|---|---|
| Carbon (C) | % |
| Heat Analysis: Product Analysis: |
0.05 - 0.15 0.04 - 0.15 |
| Manganese (Mn) | % |
| Heat Analysis: Product Analysis: |
0.30 - 0.60 0.25 - 0.66 |
| Phosphorus (P) | % |
| Heat Analysis: Product Analysis: |
0.035 0.035 |
| Sulphur (S) (Max) | % |
| Heat Analysis: Product Analysis: |
0.035 0.035 |
| Silicon (Si) | % |
| Heat Analysis: Product Analysis: |
0.50 max 0.50 max |
| Chromium (Cr) | % |
| Heat Analysis: Product Analysis: |
2.00 - 2.50 1.88 - 2.62 |
| Molybdenum (Mo) | % |
| Heat Analysis: Product Analysis: |
0.90 - 1.10 0.85 - 1.15 |
1What is ASTM A387 Grade 22 Class 2 material?
ASTM A387 Grade 22 Class 2 is a chromium-molybdenum alloy steel plate designed for high-temperature service in welded boilers and pressure vessels, featuring ~2.25% Chromium and ~1% Molybdenum for enhanced strength, heat resistance, and corrosion resistance, making it ideal for the oil, gas, and chemical industries. Class 2 indicates a higher tensile strength range (75-100 ksi) compared to Class 1, suited for more demanding applications.
2What is ASTM A387 Grade 22 Class 2 equivalent?
ASTM A387 Grade 22 Class 2 is a chromium-molybdenum alloy steel for high-temperature pressure vessels, with key equivalents being ASME SA387-22-2, EN 10CrMo9-10, DIN 10CrMo910, and BS 622-515B. These standards share similar chemical compositions (2.25% Cr, 1.0% Mo) and mechanical properties for elevated temperature service.
3 Is ASTM A387 Grade 22 Class 2 cast or forged?
ASTM A387 Grade 22 Class 2 refers to alloy steel plates, designed for welded boilers and pressure vessels in high-temperature service, not inherently cast or forged, but supplied as wrought plates with specific tensile strength (Class 2) and chromium-molybdenum content. It's a plate material for fabrication, meaning it's rolled into flat shapes, not typically cast as a single component like a casting.
4What is the maximum allowable stress value for ASTM A387 Grade 22 Class 2
For ASTM A387 Grade 22 Class 2, the key strength values are a
minimum yield strength of 45 ksi (310 MPa) and a tensile strength range of 75-100 ksi (515-690 MPa), but the actual allowable stress (often denoted as for design depends heavily on the specific temperature, service conditions (ASME Section VIII, etc.), and code used (like ASME B31.3 for piping), with typical design limits often around 25 ksi (170 MPa) or lower at ambient temperatures, increasing to potentially much higher values at elevated temperatures before decreasing again.
5What are the primary advantages of ASTM A387 Grade 22 Class 2
ASTM A387 Grade 22 Class 2 offers key advantages for high-temperature pressure vessels due to its excellent high-temperature strength, superior oxidation & corrosion resistance (from chromium & molybdenum), good weldability, and durability in demanding oil, gas, and chemical applications, ensuring performance in harsh, elevated-temperature environments.
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