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Alloy F11, also referred to as 1 1/4 Cr 1/2 Mo, is a chromium-molybdenum steel used in high-temperature service, including boiler, steam, petrochemical, and power-generation applications. It is covered under the ASTM A335 (seamless ferritic alloy-steel pipe for high-temperature service) and corresponding flange/fitting standards such as ASME/ASTM A182 F11 and ASTM A234 WP11.
| Element | Composition |
| Al | 0.018% |
| Sb | 0.0017% |
| As | 0.0048% |
| B | 0.0004% |
| C | 0.114% |
| Cr | 1.349% |
| Co | 0.0062% |
| Cu | 0.123% |
| Mn | 0.530% |
| Mo | 0.614% |
| Ni | 0.069% |
| P | 0.0067% |
| Si | 0.679% |
| S | 0.0141% |
| Sn | 0.0084% |
| Ti | 0.0015% |
| V | 0.0038% |
|
Grade |
UNS |
Chemical Composition % |
||||||
|
F11 or 1.25Cr 0.5Mo |
K11572 |
C |
Cr |
Mn | Mo | P | S | Si |
|
0.05-0.15% |
1.0-1.5% |
0.30-0.60% | 0.44-0.65% | 0.030-0.040% | 0.040% max | 0.50-1.00% | ||
P11, WP11, 1.25Cr0.5Mo, UNS K11572
A certified reference material, or CRM, is a material that has been thoroughly analyzed and characterized using multiple validated methods to determine its chemical composition. The results of these analyses are then used to establish certified values, along with associated uncertainties. CRMs are produced and certified by accredited organizations or laboratories following internationally recognized standards, such as ISO Guide 34 (ISO 17034).
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