ASTM A387 Grade 22 Class 2 pressure vessel steel falls under the ASTM A387 specification for chromium-molybdenum alloy steel plates designed for high-temperature service. This grade specifically targets welded boilers and pressure vessels operating above ...
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ASTM A387 Grade 22 Class 2 pressure vessel steel falls under the ASTM A387 specification for chromium-molybdenum alloy steel plates designed for high-temperature service. This grade specifically targets welded boilers and pressure vessels operating above 500°C (932°F), with Class 2 denoting normalized-and-tempered heat treatment for enhanced toughness.
A387 Gr.22 CL.2 alloy steel for pressure vessel applications excels in:
Elevated Temperature Strength: Retains yield strength >140 MPa at 590°C (per ASME Sec. II-D).
Hydrogen Attack Resistance: Mo-carbide network inhibits decarburization in H₂-rich environments.
Thermal Fatigue Resistance: Low ΔT cracking sensitivity during cyclic heating/cooling.
Weldability: Controlled preheat (175–230°C) + mandatory PWHT (690–730°C) ensures joint integrity.
ASTM A387 Grade 22 Class 2 is used to make heat exchangers, separators, spherical tanks, oil and gas tanks, liquefied gas tanks, nuclear reactor pressure shells, boiler drums, liquefied petroleum gas cylinders, high-pressure water pipes of hydropower stations, and turbine volutes in the petroleum, chemical industry, power station, boiler, and other industries.
ASTM A387 Grade 22 Class 2 pressure vessel steel Datasheet
| Form | Thickness (mm) | Width/Length (mm) |
|---|---|---|
| Plates | 5–250 | 1,500–4,500 x 6,000–18,000 |
| Tubes & Shells | Custom | OD ≤ 3,500 |
Equivalents for ASTM A387 Grade 22 Alloy Steel Plates
| BS | EN | ASTM/ASME | DIN |
| 622-515B | 10 CRMO910 | A387-22-2 | 10 CRMO910 |
Specifications for ASTM A387 Grade 22 Alloy Steel Plates
Chromium & Molybdenum content (according to the ASME specification)
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| A387 Grade 22 | 2.25% | 1.00% |
Tensile Requirements for ASTM A387 Grade 22 Alloy Steel Plates 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 Composition (%) of ASTM A387 Grade 22 Class 2
| CHEMICAL COMPOSITION (%) | ||||||||
| UNS | C | Mn | P, max | S, max | Si, max | Cr | Mo | |
| Heat Analysis | K21590 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50 | 2.00-2.50 | 0.90-1.10 |
| Product Analysis | K21590 | 0.04-0.15 | 0.25-0.66 | 0.025 | 0.025 | 0.50 | 1.88-2.62 | 0.85-1.15 |
Mechanical Properties of ASTM A387 Gr.22 CL2
| MECHANICAL PROPERTIES | |||
| Tensile Strength, MPa, min | Yield Strength, MPa, min | Elongation (%), min | Hardness, max |
| 515 | 310 | 18 | 241 HB |
1What is ASTM A387 Grade 22 Class 2 material ?
ASTM A387 Grade 22 Class 2 is a chromium-molybdenum (Cr-Mo) alloy steel plate designed for welded boilers and pressure vessels used in high-temperature service, offering excellent heat, corrosion, and oxidation resistance, making it ideal for oil, gas, and chemical industries. It contains specific amounts of chromium (2.00-2.50%) and molybdenum (0.90-1.10%) and is supplied in a normalized and tempered condition, providing higher tensile strength than Class 1 material.
2what is astm a387 grade 22 class 2 equivalent to?
ASTM A387 Grade 22 Class 2 is a chromium-molybdenum alloy steel for high-temp pressure vessels, with key equivalents being ASME SA387 Grade 22 Class 2, EN 10CrMo910, and BS 622-515B, also correlating to UNS K21590, suitable for high-temperature, high-pressure service in industries like oil, gas, and chemical processing.
3What are common testing requirements for astm a387 grade 22 class 2 ?
Common testing for ASTM A387 Grade 22 Class 2 involves mandatory tensile tests (strength, yield, elongation) and chemical analysis, ensuring it meets strength and composition for pressure vessels, with typical values around 75-100 ksi tensile, 45 ksi yield, and 18% elongation in 2 inches, plus mandatory checks on C, Cr, Mo content and heat treatment. Impact tests (Charpy), ultrasonic testing, and Z-direction tests are often required for critical applications, although not always mandatory in the base spec.
4What is the hardness of astm a387 grade 22 class 2 ?
ASTM A387 Grade 22 Class 2 is typically in the range of 130 to 170 Brinell Hardness (HB), but can also be specified as 150-180 HB, representing a higher strength variation with a tensile range of 75-100 ksi (515-690 MPa) and minimum yield strength of 45 ksi (310 MPa) for elevated temperature pressure vessel service, often normalized.
5What temperature is astm a387 grade 22 class 2 ?
ASTM A387 Grade 22 Class 2 is a chromium-molybdenum steel designed for high-temperature service, effectively operating up to about 600°C (1112°F), though it's generally specified for use in the 316°C to 593°C (600°F to 1100°F) range, offering good strength, oxidation, and corrosion resistance for pressure vessels and boilers.
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