Alloy Steel Grade 22 Explained
Alloy Steel Grade 22 is a high-performance 2.25% chromium–1% molybdenum alloy steel developed for severe temperature and pressure service. It offers outstanding creep strength, superior resistance to oxidation, and excellent protection against hydrogen attack in petrochemical and refinery environments. Grade 22 is extensively used in boilers, reactors, superheaters, and high-pressure steam pipelines. Its excellent mechanical strength at elevated temperatures and long-term structural stability make Alloy Steel Grade 22 sheets and plates a critical material for heavy-duty thermal and chemical processing applications.
GR 22 ALLOY STEEL SHEETS AND PLATES EQUIVALENT GRADES
| MATERIAL | STANDARD | UNS |
|---|---|---|
| 621B | A387 / SA387 | K21590 |
SPECIFICATION OF ALLOY STEEL GR 22 SHEETS AND PLATES
| Standard | ASTM A387 / ASME SA387 |
|---|---|
| Dimension Standard | JIS, AISI, ASTM, GB, DIN, EN, etc |
| Width | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc |
| Length | 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc |
| Thickness | 0.3 mm to 120 mm |
| Form | Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) etc. |
| Surface Finishing | Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, Chequered, embossed, hair line, sand blast, Brush, etching, SATIN (Met with Plastic Coated) etc. |
CHEMICAL COMPOSITION OF ALLOY STEEL GR 22 SHEETS AND PLATES
| C% | Mn% | P% | S% | Si% | Cr% | Mo% |
|---|---|---|---|---|---|---|
| 0.04-0.15 | 0.25-0.66 | 0.035 max | 0.035 max | 0.50 max | 1.88-2.62 | 0.85-1.15 |
MECHANICAL PROPERTIES OF ALLOY STEEL GR 22 SHEETS AND PLATES
| Property | Class 1 | Class 2 |
|---|---|---|
| Tensile Strength (ksi) | 60-85 | 75-100 |
| Tensile Strength (MPa) | 415-585 | 515-690 |
| Yield Strength (ksi) | 30 | 45 |
| Yield Strength (MPa) | 205 | 310 |
| Elongation in 50mm (%) | 18 | 18 |
| Reduction of area (%) | 45 | 45 |
💡 Practical Difference in Use
Use Alloy Steel Grade 22 when: exceptional high-temperature strength, corrosion resistance, and toughness are required along with excellent creep and oxidation resistance. → Example: high-pressure boilers, superheaters, turbine components, and chemical process equipment operating at elevated temperatures.
Applications of Alloy Steel Grade 22 Sheets and Plates
Alloy Steel Grade 22 is a chromium-molybdenum steel alloy optimized for high-temperature and high-pressure applications, offering durability, creep resistance, and toughness for critical industrial equipment.
- Power Generation: Boilers, turbines, heat exchangers, and superheaters.
- Chemical & Petrochemical: Pressure vessels, reactor vessels, and high-temperature piping.
- Oil & Gas: High-pressure pipelines, refinery equipment, and process vessels.
When to Choose Alloy Steel Grade 22?
Alloy Steel Grade 22 is selected when long-term reliability, high-temperature creep resistance, and strength under severe conditions are critical.
Choose Alloy Steel Grade 22 when:
- Operating temperatures are between 550–650°C
- High creep, fatigue, and oxidation resistance are required
- Used in boilers, turbines, and high-pressure piping systems
- Long-term operational reliability and weldability are critical
- Strength and durability under high-pressure and thermal stress are essential
Industries That Use Alloy Steel Grade 22 Sheets and Plates
Alloy Steel Grade 22 is widely applied in industries demanding high-temperature strength, creep resistance, and durability for critical equipment.
Key applications in boilers, turbines, and superheaters.
Uses
Steam lines, heat exchangers, and high-temperature piping.
Why Alloy Steel Grade 22?
Superior long-term creep and fatigue resistance under elevated temperatures.
Used in high-pressure pipelines, refineries, and offshore equipment.
Uses
Process piping, reactor vessels, and high-pressure valves.
Why Alloy Steel Grade 22?
High strength, toughness, and thermal reliability in extreme conditions.
Applied where high-temperature and corrosion resistance is critical.
Uses
Pressure vessels, high-temperature piping, and reactor systems.
Why Alloy Steel Grade 22?
Durable performance under severe chemical, thermal, and pressure conditions.
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