Alloy steel P11.
P11 is a 1¼% chromium, ½% molybdenum alloy steel and one of the most widely used chrome-moly grades for power and process piping.
Quick details
| Material grade | Alloy steel P11 (UNS K11597) |
|---|---|
| Forms | Pipes, Tubes, Sheets & plates, Butt-weld fittings, Flanges |
| Usage / application | Power plant steam piping, Boiler headers, Refinery and petrochemical lines |
| Test certificate | EN 10204 3.1 mill test certificate; 3.2 on request |
| Business type | Stockist and supplier |
| Location | Kumbharwada, Mumbai 400004, Maharashtra |
Also searched as: Alloy steel P11, 1¼Cr-½Mo, UNS K11597, W.Nr 1.7335, 13CrMo4-5
Product information for purchasing teams
P11 is a 1¼% chromium, ½% molybdenum alloy steel and one of the most widely used chrome-moly grades for power and process piping. It offers good creep strength and oxidation resistance up to about 550 °C at moderate cost.
Exact specification, availability and commercial details are confirmed against your enquiry.
Product forms and standards
| Form | Standard |
|---|---|
| Pipes | ASTM A335 / ASME SA335 P11 |
| Tubes | ASTM A213 T11 |
| Sheets & plates | ASTM A387 Grade 11 Class 2 |
| Butt-weld fittings | ASTM A234 WP11 |
| Flanges | ASTM A182 F11 |
Equivalent grades
| Grade | UNS | Werkstoff Nr. | EN / BS | JIS |
|---|---|---|---|---|
| Alloy steel P11 | K11597 | 1.7335 | 13CrMo4-5 | STPA 23 |
Chemical composition, %
| Grade | C | Mn | Si | P | S | Cr | Mo |
|---|---|---|---|---|---|---|---|
| Alloy steel P11 | 0.05 – 0.15 | 0.30 – 0.60 | 0.50 – 1.00 | ≤ 0.025 | ≤ 0.025 | 1.00 – 1.50 | 0.44 – 0.65 |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength | ≥ 415 MPa |
| Yield strength | ≥ 205 MPa |
| Elongation | ≥ 30% longitudinal |
Values per ASTM A335 P11. Confirm against the current edition of the standard and your purchase specification.
Density: 7.85 g/cm³
Applications
- Power plant steam piping
- Boiler headers
- Refinery and petrochemical lines
- Superheater tubing
Questions buyers ask
What are the equivalent grades of Alloy steel P11?
Alloy steel P11 is UNS K11597, Werkstoff 1.7335, EN 13CrMo4-5 and JIS STPA 23.
In which forms is Alloy steel P11 available?
Pipes to ASTM A335 / ASME SA335 P11; Tubes to ASTM A213 T11; Sheets & plates to ASTM A387 Grade 11 Class 2; Butt-weld fittings to ASTM A234 WP11; Flanges to ASTM A182 F11.
What is the density of Alloy steel P11?
About 7.85 g/cm³ (7,850 kg/m³).
Where is Steel Impex India located?
Steel Impex India is at 231/235, Sant Sena Maharaja Marg, 2nd Kumbharwada, Mumbai 400004, and supplies across India.