ASTM A335 P122 Alloy Steel Seamless Pipes (UNS K92164)
Introduction
ASTM A335 P122 (UNS K92164) is an advanced 11% Chromium steel grade alloyed with Molybdenum, Tungsten, Vanadium, and Boron, specially developed for seamless ferritic alloy steel pipes operating in extremely high-temperature and high-pressure environments. Known for superior creep strength, oxidation resistance, and long-term thermal stability, P122 is widely used in ultra-supercritical power plants, boilers, reheaters, and steam lines.
Key Features
- Excellent creep and stress-rupture strength
- Designed for ultra-high temperature service
- Superior oxidation and corrosion resistance
- Enhanced thermal stability over long service duration
- High-strength 11Cr alloy with W, Mo, V, Nb, and B
- Suitable for supercritical and ultra-supercritical boiler systems
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | A335 P122 |
| ASME | SA335 P122 |
| UNS | K92164 |
| EN / DIN | 12Cr11MoWVNb (approx. comparable) |
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 P122 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.07 – 0.13 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.010 |
| Silicon (Si) | 0.20 – 0.50 |
| Chromium (Cr) | 10.00 – 12.00 |
| Molybdenum (Mo) | 0.25 – 0.60 |
| Tungsten (W) | 1.50 – 2.00 |
| Vanadium (V) | 0.15 – 0.30 |
| Niobium (Nb) | 0.04 – 0.10 |
| Nitrogen (N) | 0.03 – 0.07 |
| Boron (B) | 0.001 – 0.006 |
| Nickel (Ni) | ≤ 0.40 |
A335 Gr P122 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 620 MPa |
| Yield Strength | ≥ 400 MPa |
| Elongation | ≥ 20% |
| Hardness | ≤ 250 HB |
| Impact Strength | High at elevated temperatures |
Gr P122 Physical Properties
| Property | Value |
|---|---|
| Density | 7.75 g/cm³ |
| Thermal Conductivity | 27–30 W/m·K |
| Modulus of Elasticity | 200–210 GPa |
| Melting Point | 1420 – 1480°C |
| Specific Heat Capacity | 460 J/kg·K |
Types of ASTM A335 P122 Pipes
- Seamless Alloy Steel Pipes
- Hot-Finished Pipes
- Cold-Drawn Pipes
- High-Pressure Boiler Tubes
- Superheater and Reheater Tubes
- Heat Exchanger Pipes
- Steam Line Pipes
Application
- Ultra-Supercritical and Supercritical Power Plants
- High-Temperature Steam Lines
- Boilers, Economizers, and Reheaters
- Superheaters
- Petrochemical and Refinery Plants
- Chemical Processing Facilities
- High-Temperature Heat Exchangers
- Thermal Power Stations
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