ASTM A335 P22: properties, composition, uses and standards
ASTM A335 P22 is a chrome-moly alloy steel pipe for high-temperature, high-pressure service, chosen for high-pressure steam and hydrogen service up to about 580 °C., density 7.85 g/cm³.
What is ASTM A335 P22?
ASTM A335 P22 is a chrome-moly alloy steel pipe for high-temperature, high-pressure service. Engineers choose it for high-pressure steam and hydrogen service up to about 580 °C. It is also known as SA-335 P22, 2¼Cr-1Mo alloy pipe, UNS K21590.
- Designation
- ASTM A335 P22
- Also called
- SA-335 P22 · 2¼Cr-1Mo alloy pipe · UNS K21590
- Standard
- ASTM A335 Grade P22
- 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 P22.
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 P22 — condition per order.
Where ASTM A335 P22 is used
- Power plants. High-pressure steam lines. Industry →
- Refineries. Hydrotreater and reformer piping. Industry →
Welding P22
The matching filler is ER90S-B3 / E9018-B3. Preheat and PWHT per ASME B31.1 / B31.3.
ASTM A335 P22 standards by product
Buying ASTM A335 P22: what to specify
- The product standard and the UNS or designation — for example ASTM A335 P22.
- 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.