ASTM A335 P22 Alloy Steel Seamless Pipes (UNS K21590)
Introduction
ASTM A335 P22 (UNS K21590) is a Chromium-Molybdenum (Cr-Mo) alloy steel grade specifically engineered for seamless ferritic alloy steel pipes used in high-temperature and high-pressure environments. These pipes offer excellent oxidation resistance, superior creep strength, and enhanced durability, making them suitable for boilers, heat exchangers, and power generation systems.
Key Features
- Designed for high-temperature and high-pressure applications
- Excellent resistance to oxidation and corrosion
- Superior creep strength and durability
- Seamless pipe structure ensures flawless performance
- Ideal for boilers, superheaters, and reheaters
- Good weldability and formability
Equivalent Grade
| Standard | Grade |
|---|---|
| ASTM | A335 P22 |
| ASME | SA335 P22 |
| UNS | K21590 |
| EN | 10CrMo9-10 |
| DIN | 13CrMo44 |
Sizes
- Outside Diameter (OD): 1/2” to 36”
- Nominal Bore (NB): DN15 to DN900
- Wall Thickness: SCH 20, SCH 30, SCH 40, SCH 80, SCH 160, XXS
ASTM A335 P22 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Silicon (Si) | 0.50 – 1.00 |
| Chromium (Cr) | 1.90 – 2.60 |
| Molybdenum (Mo) | 0.87 – 1.13 |
Gr P22 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 415 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 30% |
| Hardness | 163 HB Max |
A335 Gr P22 Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Melting Point | 1425 – 1510°C |
| Thermal Conductivity | 33 W/m·K |
| Modulus of Elasticity | 205 GPa |
Types of ASTM A335 P22 Pipes
- Seamless Alloy Steel Pipes
- Hot-Finished Pipes
- Cold-Drawn Pipes
- Boiler Pipes
- Superheater Pipes
- Heat Exchanger Pipes
Application
- Power Generation Plants
- Oil & Gas Refineries
- Petrochemical Units
- Heat Exchangers
- High-Temperature Steam Lines
- Boilers, Superheaters, and Reheaters
- Chemical Processing Plants
- Thermal Power Stations
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