ASTM A335 P11: properties, composition, uses and standards
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
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Molybdenum | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Phosphorus | As specified |
| Sulphur | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A335 Grade P11.
Mechanical properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM A335 Grade P11 — condition per order.
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 or 3.2 available on request / as specified in the PO; ask for 3.2 if a third party must witness.