ASTM A369 FP22 Alloy Steel Pipe (UNS K21590)
ASTM A369 FP22 (UNS K21590) is a chromium-molybdenum (Cr-Mo) ferritic alloy steel grade designed for forged and bored heavy-wall pipes used in high-temperature and high-pressure service. With enhanced Cr-Mo content, FP22 offers superior creep strength, oxidation resistance, and long-term thermal stability—making it ideal for power generation, boilers, superheaters, heat exchangers, and petrochemical processing equipment.
Key Features
- Cr-Mo ferritic alloy steel – UNS K21590
- Suitable for high-temperature & high-pressure service
- Forged and bored heavy-wall construction for maximum durability
- Excellent resistance against oxidation & thermal fatigue
- Ideal for boilers, pressure piping & steam service
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | A369 FP22 |
| ASME | SA369 FP22 |
| UNS | K21590 |
| EN / DIN | — |
ASTM A369 FP22 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Silicon (Si) | 0.50 max |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Chromium (Cr) | 1.90 – 2.60 |
| Molybdenum (Mo) | 0.87 – 1.13 |
FP22 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 415 MPa (min) |
| Yield Strength | 205 MPa (min) |
| Elongation | 20–30% (min) |
FP22 Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Thermal Conductivity | ~25–35 W/m·K |
| Modulus of Elasticity | ~200 GPa |
| Melting Point | Approx. 1425–1500°C |
Type of FP22 Pipe
- Forged & Bored Alloy Steel Pipe
- Heavy Wall High-Temperature Pipe
- Custom Machined Cr-Mo Pipes
- Seamless Power Plant & Boiler Pipes
Applications
- Boilers
- Superheaters
- Petrochemical Processing
- Heat Exchangers
- Steam Lines
- Pressure Piping
- Power Generation Equipment
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