ASTM A335 P92 Alloy Steel Seamless Pipes (UNS K92460)
Introduction
ASTM A335 P92 (UNS K92460) is a high-performance 9% Chromium, Molybdenum, Tungsten, Vanadium, and Niobium stabilized alloy steel grade designed for seamless ferritic alloy steel pipes used in extremely high-temperature and high-pressure environments. P92 is an advanced version of P91 with improved creep strength, oxidation resistance, and long-term thermal stability, making it ideal for modern supercritical and ultra-supercritical power plant systems.
Key Features
- Highest creep and stress-rupture strength among Cr-Mo steels
- Excellent performance in ultra-high temperature operations
- Superior oxidation resistance due to W and Mo addition
- Enhanced structural stability and minimal deformation
- Designed for supercritical and ultra-supercritical boiler systems
- High weldability and superior long-term reliability
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | A335 P92 |
| ASME | SA335 P92 |
| UNS | K92460 |
| EN / DIN | X10CrWMoVNb9-2 |
| Material No. | 1.4901 |
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 P92 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) | 8.50 – 9.50 |
| Molybdenum (Mo) | 0.30 – 0.60 |
| Tungsten (W) | 1.50 – 2.00 |
| Vanadium (V) | 0.15 – 0.25 |
| Niobium (Nb) | 0.04 – 0.09 |
| Nitrogen (N) | 0.03 – 0.07 |
| Nickel (Ni) | ≤ 0.40 |
Gr P92 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 620 MPa |
| Yield Strength | ≥ 440 MPa |
| Elongation | ≥ 20% |
| Hardness | ≤ 250 HB |
| Impact Toughness | Excellent at elevated temperatures |
Gr P92 Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Thermal Conductivity | 27–30 W/m·K |
| Modulus of Elasticity | 200–210 GPa |
| Melting Point | 1420 – 1470°C |
| Specific Heat Capacity | 460 J/kg·K |
Types of A335 Gr P92 Pipes
- Seamless Alloy Steel Pipes
- Hot-Finished Pipes
- Cold-Drawn Pipes
- High-Pressure Boiler Pipes
- Steam Line Pipes
- Superheater & Reheater Tubes
- Heat Exchanger Pipes
Application
- Ultra-Supercritical and Supercritical Power Plants
- High-Temperature Steam Lines
- Boilers, Economizers, and Reheaters
- Superheaters
- Petrochemical and Refinery Units
- Heat Exchangers
- Thermal Power Stations
- Chemical Processing Plants
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