ASTM A182 F22
ASTM A182 F22 Alloy Steel Flanges / Fittings
ASTM A182 F22 is a chromium-molybdenum (Cr-Mo) alloy steel grade widely used for high-temperature and high-pressure applications. It offers excellent strength, improved hardenability, superior oxidation resistance, and outstanding performance in elevated temperature environments.
Manufacturers prefer ASTM A182 F22 for forged flanges, fittings, valves, pressure vessels, and power generation components due to its stable metallurgical structure and enhanced mechanical properties.
Key Features
High strength and durability under high pressure
Excellent resistance to oxidation and scaling
Superior performance in elevated temperature services
Good weldability and machinability after heat treatment
Enhanced corrosion resistance in steam, chemical, and petroleum environments
Suitable for power plants, petrochemical units, and boiler equipment
Specification
| Property | Details |
|---|---|
| Grade | ASTM A182 F22 |
| Material | Cr-Mo Alloy Steel |
| Standard | ASTM A182 / ASME SA182 |
| Manufacturing Process | Forged / Rolled / Heat Treated |
| Forms Available | Flanges, Fittings, Rings, Shafts, Bars |
| Class | 150, 300, 600, 900, 1500, 2500 |
| Condition | Annealed / Normalized & Tempered / Quenched & Tempered |
| Size Range | ½” to 48” (Varies by product form) |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASME | SA182 F22 |
| UNS | K21590 |
| DIN | 1.7380 |
| BS | 3603-622-515 |
| EN | 13CrMo4-5 |
Available Sizes
Flanges: ½” to 48”
Forged Fittings: ½” to 4”
Bars & Shafts: 20mm to 450mm diameter
Rings & Custom Forgings: As per drawing
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Silicon (Si) | 0.50 – 1.00 |
| Chromium (Cr) | 2.00 – 2.50 |
| Molybdenum (Mo) | 0.90 – 1.10 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 415 MPa (Min) |
| Yield Strength | 205 MPa (Min) |
| Elongation | 20% (Min) |
| Hardness (HB) | 179 – 217 |
| Impact Strength | Good at room & elevated temperatures |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Melting Point | 1400 – 1450°C |
| Thermal Conductivity | 29 W/m·K |
| Modulus of Elasticity | 190 – 210 GPa |
| Specific Heat | 460 J/kg·K |
Types
1. Forged Flanges
Weld Neck Flange
Blind Flange
Slip-On Flange
Socket Weld Flange
Threaded Flange
Lap Joint Flange
Orifice & Spectacle Blinds
2. Forged Fittings
Elbows (45°/90°)
Tees, Crosses
Couplings
Unions
Caps & Plugs
Nipples
3. Custom Forged Products
Rings
Blocks
Shafts
Bars
Corrosion Resistance
ASTM A182 F22 provides moderate corrosion resistance in:
Steam environments
Hydrogen-rich atmospheres
Mild acidic & alkaline media
High-temperature oxidizing conditions
Sulfidation environments
Heat Resistance
Excellent high-temperature strength up to 600–650°C
Strong resistance to thermal fatigue
Good creep resistance and stress rupture strength
Oxidation-resistant in steam and hot gases
Heat Treatment
Applicable heat treatment methods for F22:
Annealing: 860–910°C, air cooling
Normalizing: 900–940°C
Tempering: 650–760°C
Quenching: Oil or water quench as required
Heat treatment enhances hardness, weldability, and creep strength.
Welding
ASTM A182 F22 can be welded using:
TIG welding
MIG welding
SMAW
SAW
Preheating (150–300°C) and post-weld heat treatment (PWHT at 700–760°C) are recommended to prevent cracking and maintain mechanical properties.
Fabrication
Good forgeability at 1000–1200°C
Machining becomes easier after annealing
Suitable for forging complex shapes
Maintains dimensional stability during fabrication
Applications
Power generation equipment
Boiler and pressure vessels
Petrochemical and refinery units
Heat exchangers & superheater parts
Turbine components
High-pressure steam pipelines
Oil & gas processing units
Chemical industries