ASTM A350 Grade LF2 · low-temperature forging
Impact-tested carbon steel forging; the counterpart of A105 usable down to −46 °C. A flange and forged body material for LPG and cold-region plants.
- Rp0.2 · MPa
- ≥ 250
- Rm · MPa
- 485–655
- TEMPERATURE
- −46 … +425 °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 A350 · LF2 Class 1 | 250 | — | 485–655 | 22 | Test at −46 °C |
ASME B16.34 pressure-temperature ratings
| CLASS · bar | −29 … 38 °C | 100 °C | 200 °C | 300 °C | 400 °C | 500 °C |
|---|---|---|---|---|---|---|
| Class 150 | 19.6 | 17.7 | 13.8 | 10.2 | 6.5 | — |
| Class 300 | 51.1 | 46.6 | 43.8 | 39.8 | 34.7 | — |
| Class 600 | 102.1 | 93.2 | 87.6 | 79.6 | 69.4 | — |
| Class 900 | 153.2 | 139.8 | 131.4 | 119.5 | 104.2 | — |
| Class 1500 | 255.3 | 233.0 | 219.0 | 199.1 | 173.6 | — |
| Class 2500 | 425.5 | 388.3 | 365.0 | 331.8 | 289.3 | — |
Standard class, bar. Material group: A105/LF2. Greyed values are outside the material's service range (−46 … +425 °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, 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
- Impact guarantee at −46 °C
- Same strength as A105
Weaknesses
- No corrosion resistance
- Cost of impact testing
Manufacturing and use
- ECONOMY
- Low.
- MANUFACTURING METHODS
- Forging + heat treatment + impact testing
- TYPICAL VALVE PARTS
- Forged body · Flange
Surface protection
- Wet paintIndustrial wet paint systemEmsal standard external protection
- Epoxy powder coatingElectrostatic epoxy powder coating (oven-cured, FBE)Water lines, internal and external
- GalvanizingHot-dip galvanizingSevere outdoor environments
Source: ASTM A350. Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.