ASTM A335 P2 Seamless Alloy Steel Pipes (UNS K11523)
ASTM A335 P2 Seamless Pipes, manufactured from UNS K11523, are chromium-molybdenum alloy steel pipes engineered for high-temperature, high-pressure service. Their exceptional strength, thermal stability, and resistance to oxidation make them suitable for demanding applications in power plants, boilers, petrochemical facilities, and industrial steam pipelines.
With added chromium and molybdenum, ASTM A335 P2 delivers improved creep resistance, better corrosion protection, and excellent performance under cyclic temperature variations. These pipes are manufactured in seamless form to ensure superior pressure-handling capability and long-term durability.
Key Features
- Manufactured according to ASTM A335 standard
- Made from UNS K11523 (Chrome-Moly Alloy Steel)
- Excellent high-temperature mechanical strength
- Good creep resistance and oxidation resistance
- Compatible with boiler, heater, and heat exchanger operations
- Available in hot-finished and cold-drawn seamless forms
- High dimensional accuracy with superior weldability
Equivalent Grades
| Standard |
Grade / Material Number |
| ASTM |
A335 P2 |
| ASME |
SA335 P2 |
| UNS |
K11523 |
| DIN |
1.5415 |
| EN |
16Mo3 |
| BS |
1503-622-490 |
Available Sizes
-
- Nominal Bore (NB) / Nominal Pipe Size (NPS): 1/8″ NB to 30″ NB
- Outside Diameter (OD): 6 mm to 860 mm
- Wall Thickness (WT): 1 mm to 100 mm
ASTM A335 P2 Chemical Composition
| Element |
% |
| Carbon |
0.05 – 0.15 |
| Manganese |
0.30 – 0.60 |
| Phosphorus |
0.025 max |
| Sulfur |
0.025 max |
| Silicon |
0.10 – 0.50 |
| Chromium |
0.44 – 0.65 |
| Molybdenum |
0.44 – 0.65 |
ASTM A335 Gr P2Mechanical Properties
| Property |
Value |
| Tensile Strength |
380 MPa min |
| Yield Strength |
205 MPa min |
| Elongation |
30% min |
| Hardness |
85 HRB max |
Gr P2Physical Properties
| Property |
Value |
| Density |
7.85 g/cm³ |
| Modulus of Elasticity |
200 GPa |
| Thermal Conductivity |
45 W/m-K |
| Melting Point |
1430°C |
Types of Gr P2 Pipes
- Seamless Alloy Steel Pipes
- Hot Finished Seamless Pipes
- Cold Drawn Seamless Pipes
Applications
- High-temperature steam pipelines
- Power plant boiler tubes
- Heat exchangers and heaters
- Petrochemical and refinery equipment
- Pressure vessels
- Superheater tubes
- Industrial furnace components
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