ASTM A387 Grade 22 Class 1
ASTM A387 Grade 22 Class 1 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 %.
ASTM A387 Grade 22 Class 1 is a chromium molybdenum Alloy steel plate intended primarily for welded boiler and pressure vessels designed of elevated temperature service. is ASTM A387 grade 22 steel in the annealed condition..
ASTM A387 Grade 22 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate for high-temperature, high-pressure applications like boilers and pressure vessels, offering lower tensile strength (around 60-85 ksi) than Class 2 but excellent weldability, corrosion resistance, and thermal stability for demanding industries like oil & gas, petrochemicals, and power generation, with specific properties including 2.25% Cr and 1% Mo content.
Key Characteristics
Material Type: Chromoly (Cr-Mo) Alloy Steel.
Primary Use: Welded boilers, pressure vessels, and equipment for elevated temperature service.
Composition: Approximately 2.25% Chromium (Cr) and 1.00% Molybdenum (Mo).
Tensile Strength (Class 1): 415-585 MPa (60-85 ksi).
Yield Strength (Class 1): 205 MPa minimum (30 ksi min).
Elongation (Class 1): 18% minimum (in 2 inches/50mm).
Distinction from Class 2: Class 1 has lower strength requirements than Class 2 (which is 75-100 ksi tensile) but shares the same base material, differing only in strength levels, notes Textron Steel and Alloys.
Applications
Oil & Gas Industry
Petrochemical Plants
Chemical Processing
Power Generation
Heat Exchangers
Benefits
Resistance to oxidation and creep at high temperatures.
Good weldability and fabricability.
High strength and thermal stability in demanding conditions.
Equivalents for ASTM A387 Grade 22 CLASS 1 Alloy Steel Plates
| BS | EN | ASTM/ASME | DIN |
| 622-515B | 10 CRMO910 | A387-22-1 |
10 CRMO910 |
ASTM A387 Grade 22 CLASS 1 Plate Specification :
| Standard | ASTM A387 / ASME SA 387 |
|---|---|
| Width | 1000mm-4500mm |
| Thickness | 5mm-150mm |
| Length | 3000mm-18000mm |
| Impact tested | -52° C |
| Material | Alloy Steel |
| Process of Manufacturing | Hot-Rolled (HR) |
Tensile Requirements for ASTM A387
Alloy Steel ASTM A387 Grade 22 CLASS 1 Plates Chemical Composition :
| Grade | C | Mn | P | S | Si | Cr | Mo |
| Alloy Steel Gr.22 | 0.04 – 0.15 | 0.25 – 0.66 | 0.035 | 0.035 | 0.5 max | 1.88 – 2.62 | 0.85 – 1.15 |
Alloy Steel Plates Class 1 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) |
Alloy Steel ASTM A387 Grade 22 CLASS 1 Plates Chemical Composition :
| Grade | C | Mn | P | S | Si | Cr | Mo |
| Alloy Steel Gr.22 | 0.04 – 0.15 | 0.25 – 0.66 | 0.035 | 0.035 | 0.5 max | 1.88 – 2.62 | 0.85 – 1.15 |
1 What is ASTM A387 grade 22 class 1 material?
ASTM A387 Grade 22 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate for high-temperature pressure vessels, featuring about 2.25% Chromium and 1.00% Molybdenum for improved strength, corrosion, and oxidation resistance, with Class 1 indicating a lower tensile strength range (60-85 ksi) compared to Class 2.
2 What is ASTM A387 grade 22 class 1 equivalent to ?
ASTM A387 Grade 22 Class 1 is a 2.25Cr-1Mo alloy steel for pressure vessels, with key equivalents being ASME SA387 Grade 22 Class 1, EN 10 CrMo9-10 (or 1.7380), and DIN 10 CrMo9-10, sharing similar composition but differing in mechanical properties (tensile strength, yield strength) from Class 2 versions.
3 What is the difference between ASTM A387 grade 22 class 1 and class 2 ?
The main difference between ASTM A387 Grade 22 Class 1 and Class 2 is in their mechanical properties, specifically tensile and yield strength, with Class 2 having higher strength but Class 1 offering better ductility (elongation/formability), while the chemical composition (2.25% Cr, 1.00% Mo) remains the same. Class 1 is generally annealed for better weldability and forming, whereas Class 2 is for higher-temperature services requiring greater strength.
4What is the density of ASTM A387 Grade 22 Class 1?
The density of ASTM A387 Grade 22 Class 1 steel is approximately 7.85 g/cm³ (0.284 lb/in³), a typical value for alloy steels, reflecting its iron base with chromium and molybdenum content, making it similar to standard carbon steels but with enhanced high-temperature strength.
5What is the maximum allowable stress value for ASTM A387 Grade 22 Class 1?
For ASTM A387 Grade 22 Class 1, the minimum yield strength is 30 ksi (205 MPa), and the tensile strength ranges from 60 to 85 ksi (415 to 585 MPa), with specific allowable stress values (like those used in ASME code calculations) dependent on the design temperature and code section, but generally derived from these strength limits.
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