ASTM A335 P15 Alloy Steel Seamless Pipes (UNS K11562)
Introduction
ASTM A335 P15 (UNS K11562) is a Chromium-Molybdenum alloy steel grade designed for seamless ferritic alloy steel pipes used in high-temperature service conditions. The alloy offers a balance of strength, oxidation resistance, and thermal stability, making it suitable for steam lines, boilers, heat exchangers, and petrochemical systems. P15 pipes are known for their improved mechanical properties and long-term reliability under elevated temperature and pressure conditions.
Key Features
- Excellent high-temperature strength and stability
- Good creep resistance for long-duration elevated temperature operations
- Enhanced corrosion and oxidation resistance
- Suitable for high-pressure and thermal service applications
- Seamless construction ensures uniformity and durability
- Ideal for steam lines, boilers, and refinery applications
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | A335 P15 |
| ASME | SA335 P15 |
| UNS | K11562 |
| JIS | SCM415 (approx.) |
| BS / EN | 15CrMo5 (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 P15 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.10 – 0.20 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Silicon (Si) | 0.50 – 1.00 |
| Chromium (Cr) | 0.80 – 1.25 |
| Molybdenum (Mo) | 0.45 – 0.65 |
Gr P15 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 415 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 163 HB |
A335 Gr P15 Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Thermal Conductivity | 33 W/m·K |
| Modulus of Elasticity | 205 GPa |
| Melting Point | 1420 – 1460°C |
Types of ASTM A335 P15 Pipes
- Seamless Alloy Steel Pipes
- Hot-Finished Pipes
- Cold-Drawn Pipes
- Boiler Pipes
- Superheater Pipes
- Heat Exchanger Pipes
Applications
- Power Generation Plants
- Steam Boilers and Steam Lines
- Petrochemical and Refinery Units
- Heat Exchangers
- Superheaters and Reheaters
- Chemical Processing Plants
- High-Temperature Fluid Transport
- Thermal Power Stations
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