Grade guide · MS / CS & Alloy Steel
ASTM A335 P11: properties, composition, uses and standards
Short answer
ASTM A335 P11 is a chrome-moly alloy steel pipe for high-temperature service, chosen for steam and hot-oil piping up to about 550 °C., density 7.85 g/cm³.
What is ASTM A335 P11?
ASTM A335 P11 is a chrome-moly alloy steel pipe for high-temperature service. Engineers choose it for steam and hot-oil piping up to about 550 °C. It is also known as SA-335 P11, 1¼Cr-½Mo alloy pipe, UNS K11597.
- Designation
- ASTM A335 P11
- Also called
- SA-335 P11 · 1¼Cr-½Mo alloy pipe · UNS K11597
- Standard
- ASTM A335 Grade P11
- Density
- 7.85 g/cm³
- Melting range
- 1420 – 1530 °C
- Magnetic
- Magnetic
Chemical composition
| Element | Weight % |
|---|---|
| Chromium | 1.00 – 1.50 |
| Molybdenum | 0.44 – 0.65 |
| Carbon | 0.05 – 0.15 |
| Manganese | 0.30 – 0.60 |
| Silicon | 0.50 – 1.00 |
| Phosphorus | 0.025 max |
| Sulphur | 0.025 max |
Per ASTM A335 Grade P11.
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength | 415 MPa · 60 ksi |
| Yield strength 0.2% | 205 MPa · 30 ksi |
| Elongation | 30% |
Minimum values. Values for pipe, bar and forgings differ slightly — see the product standard.
Where ASTM A335 P11 is used
- Power plants. Main steam and reheat lines. Industry →
- Refineries. Heater and hot-oil piping. Industry →
Welding P11
The matching filler is ER80S-B2 / E8018-B2. Preheat and PWHT per ASME B31.1 / B31.3.
ASTM A335 P11 standards by product
Buying ASTM A335 P11: what to specify
- The product standard and the UNS or designation — for example ASTM A335 P11.
- Size, thickness or schedule, and quantity in pieces and kg or metres.
- Heat-treatment condition where the standard offers a choice.
- Certificate: EN 10204 3.1 as standard, 3.2 if a third party must witness.