ASTM A182 Grade F22 · 2¼Cr–1Mo
Forged 2¼Cr–1Mo alloy steel; the wrought counterpart of WC9 castings. For high-temperature lines in power plants and refineries.
- Rp0.2 · MPa
- ≥ 205
- Rm · MPa
- 415–585
- TEMPERATURE
- −29 … +593 °C
- COST
Chemical composition
The values in this section are being verified.
Mechanical properties
| STANDARD · CONDITION | Rp0.2 MPa | Rp1.0 MPa | Rm MPa | A % | KV J |
|---|---|---|---|---|---|
| ASTM A182 · F22 Class 1 | 205 | — | 415–585 | 20 | — |
| ASTM A182 · F22 Class 3 | 310 | — | 515–690 | 20 | — |
Room temperature. The classes define the same grade at different strength levels (ASTM A182 and A336 share the class values).
ASME B16.34 pressure-temperature ratings
| CLASS · bar | −29 … 38 °C | 100 °C | 200 °C | 300 °C | 400 °C | 500 °C |
|---|---|---|---|---|---|---|
| Class 150 | 19.8 | 17.7 | 13.8 | 10.2 | 6.5 | 2.8 |
| Class 300 | 51.7 | 51.5 | 48.6 | 42.9 | 36.5 | 28.2 |
| Class 600 | 103.4 | 103.0 | 97.2 | 85.7 | 73.3 | 56.5 |
| Class 900 | 155.1 | 154.6 | 145.8 | 128.6 | 109.8 | 84.7 |
| Class 1500 | 258.6 | 257.6 | 243.4 | 214.4 | 183.1 | 140.9 |
| Class 2500 | 430.9 | 429.4 | 405.4 | 357.1 | 304.9 | 235.0 |
Standard class, bar. Material group: F22. Greyed values are outside the material's service range (−29 … +593 °C). Flanged-end ratings end at 538 °C.
Service temperature
This is the limit of the material itself. A valve's service temperature is usually set by the seal and seat materials; product pages give it for each seal option.
Physical properties and heat treatment
- HEAT TREATMENT
- Normalizing + tempering, or quenching + tempering.
Media suitability GENERAL TREND
Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.
Strengths and weaknesses
Strengths
- Creep strength at high temperature
- Resistant to graphitization
- Forged structure
Weaknesses
- Requires preheating and post-weld heat treatment
- Limited corrosion resistance
Manufacturing and use
- ECONOMY
- Low to medium.
- MANUFACTURING METHODS
- Forging + heat treatment
- TYPICAL VALVE PARTS
- Forged body · Flange · Bonnet
Surface protection
- Wet paintIndustrial wet paint systemExternal surface; silicone-based heat-resistant paint is needed at high temperature
Source: ASTM A182. Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.