ASTM A335 P11 — Pipe & Tube, Fittings & Flanges
Also sold as SA-335 P11 · 1¼Cr-½Mo alloy pipe · UNS K11597
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. We manufacture, trade and export it as pipe & tube, fittings, flanges; EN 10204 3.1 or 3.2 certificates are available on request / as specified in the PO. Markets we have supplied to include Oman, UAE, Saudi Arabia, Brazil, Argentina, Spain and Chile (India is the home market).
- P11
- ρ 7.85 g/cm³
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
ASTM A335 P11 Specifications by Product — Which Standard Applies?
The material standard changes with the product form. This is the table buyers ask for most.
| Product | Material standard | Dimensions |
|---|---|---|
| ASTM A335 P11 pipe & tube | ASTM A335 P11 | ASME B36.19 / B36.10 |
| ASTM A335 P11 fittings | ASTM A234 WP11 · ASTM A182 F11 | ASME B16.9 · B16.11 |
| ASTM A335 P11 flanges | ASTM A182 F11 | ASME B16.5 · B16.47 |
ASTM A335 P11 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.
ASTM A335 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.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting range | 1420 – 1530 °C |
| Magnetic | Magnetic |
ASTM A335 P11 Equivalent Grades
Where Is ASTM A335 P11 Used? Applications
Welding ASTM A335 P11
| Matching filler | ER80S-B2 / E8018-B2 |
|---|---|
| Also used | Preheat and PWHT per ASME B31.1 / B31.3 |
ASTM A335 P11 — questions buyers ask
What is ASTM A335 P11?
ASTM A335 P11 is a chrome-moly alloy steel pipe for high-temperature service. It is chosen for steam and hot-oil piping up to about 550 °C.
Which standards cover ASTM A335 P11 products?
Pipe & Tube: ASTM A335 P11; Fittings: ASTM A234 WP11 · ASTM A182 F11; Flanges: ASTM A182 F11. Always name the standard and edition on your order.
What is the density of ASTM A335 P11?
7.85 g/cm³ — use it to calculate weights: plate kg = L(m) × W(m) × t(mm) × 7.85.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026