ASTM A335 P12 Seamless Alloy Steel Pipes (UNS K11562)
ASTM A335 P12 Seamless Pipes, manufactured from UNS K11562, are chromium-molybdenum alloy steel pipes designed for high-temperature and high-pressure service environments. Known for their excellent creep resistance, enhanced strength, and reliable performance under prolonged thermal exposure, P12 pipes are widely used in boilers, power plants, heaters, steam lines, and petrochemical processing units.
P12 alloy steel provides a balanced combination of chromium and molybdenum, offering superior resistance to oxidation, corrosion, and mechanical fatigue. Its seamless construction ensures high integrity, uniform strength, and safe operation in demanding industrial applications.
Key Features
- Chrome-Moly seamless alloy steel material (UNS K11562)
- Designed for high-temperature and high-pressure environments
- Excellent resistance to creep, corrosion, and thermal stress
- Suitable for steam lines, heaters, boilers, and refinery piping
- Manufactured in hot-finished or cold-drawn seamless form
- High dimensional stability and long service life
- Available in all major schedules and thicknesses
Equivalent Grades
| Standard | Grade / Material Number |
|---|---|
| ASTM | A335 P12 |
| ASME | SA335 P12 |
| UNS | K11562 |
| DIN | 13CrMo44 |
| EN | 13CrMo4-4 |
| BS | 3604 620-440 |
Available Sizes
- Outside Diameter (OD) Range: 1/2” to 36” (DN25 to DN900)
- Schedules Available: SCH 20, SCH 30, SCH 40, SCH 60, SCH 80, SCH 100, SCH 120, SCH 140, SCH 160, XXS
ASTM A335 P12 Chemical Composition
| Element | % |
|---|---|
| Carbon | 0.05 – 0.15 |
| Manganese | 0.30 – 0.60 |
| Phosphorus | 0.025 max |
| Sulfur | 0.025 max |
| Silicon | 0.50 – 1.00 |
| Chromium | 0.80 – 1.25 |
| Molybdenum | 0.44 – 0.65 |
Gr P12 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 415 MPa min |
| Yield Strength | 205 MPa min |
| Elongation | 30% min |
| Hardness | 85 HRB max |
Gr P12 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Thermal Conductivity | 42 W/m-K |
| Modulus of Elasticity | 200 GPa |
| Melting Point | 1425–1510°C |
| Specific Heat | 460 J/kg-K |
Type of ASTM A335 P12 Tubes
- Seamless Alloy Steel Pipes
- Hot Finished Pipes
- Cold Drawn Pipes
Applications
- Power plant boiler tubes
- Superheater and reheater pipes
- Steam pipelines
- Petrochemical and refinery installations
- Heat exchanger tubes
- High-temperature service piping
- Industrial furnace components
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