ASTM A335 P23 Alloy Steel Seamless Pipes (UNS K41650)
Introduction
ASTM A335 P23 (UNS K41650) is a low-alloy Chromium-Molybdenum-Vanadium (Cr-Mo-V) steel grade designed for high-temperature, high-pressure seamless ferritic alloy steel pipes. Known for its enhanced creep strength, improved oxidation resistance, and long-term stability, P23 is widely used in modern power plants, refineries, and superheater systems that demand superior thermal performance.
Key Features
- Enhanced creep and stress-rupture strength
- Excellent oxidation and corrosion resistance
- More efficient than P22 due to Vanadium addition
- Suitable for extreme high-temperature operations
- Seamless construction for superior integrity
- Long service life in boilers and steam systems
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | A335 P23 |
| ASME | SA335 P23 |
| UNS | K41650 |
| EN / DIN | 7CrWVMoNb9-6 (approx.) |
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 P23 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.010 |
| Silicon (Si) | 0.20 – 0.50 |
| Chromium (Cr) | 1.90 – 2.60 |
| Molybdenum (Mo) | 0.25 – 0.65 |
| Vanadium (V) | 0.04 – 0.10 |
| Niobium (Nb) | 0.02 – 0.08 |
| Nitrogen (N) | 0.03 – 0.07 |
| Tungsten (W) | 1.45 – 2.75 |
A335 P23 Gr P23 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 510 MPa |
| Yield Strength | ≥ 400 MPa |
| Elongation | ≥ 20% |
| Hardness | ≤ 190 HB |
Gr P23 Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Thermal Conductivity | 34–36 W/m·K |
| Modulus of Elasticity | 200–210 GPa |
| Melting Point | 1420 – 1460°C |
Types of A335 P23 Pipes
- Seamless Alloy Steel Pipes
- Hot-Finished Pipes
- Cold-Drawn Pipes
- High-Pressure Boiler Pipes
- Superheater Tubes
- Heat Exchanger Pipes
Applications
- Power Generation Plants (Ultra-Supercritical & Supercritical)
- High-Temperature Steam Lines
- Boilers and Economizers
- Superheaters and Reheaters
- Petrochemical and Refinery Units
- Heat Exchangers
- Thermal Power Stations
- Chemical Processing Plants
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