Carbon and alloy steel · cast
LCB
ASTM A352 Grade LCB
Impact-tested low-temperature carbon steel casting. The version of WCB usable down to −46 °C; used in LPG and cold-climate plants.
- Rp0.2 · MPa
- ≥ 240
- Rm · MPa
- 450–620
- TEMPERATURE
- −46 … +343 °C
- COST
Chemical composition
C≤ 0.30
Si≤ 0.60
Mn≤ 1.00
P≤ 0.04
S≤ 0.045
Cu≤ 0.30
Ni≤ 0.50
Cr≤ 0.50
Mo≤ 0.20
V≤ 0.03
Mechanical properties
| STANDARD · CONDITION | Rp0.2 MPa | Rp1.0 MPa | Rm MPa | A % | KV J |
|---|---|---|---|---|---|
| ASTM A352 · LCB | 240 | — | 450–620 | 24 | 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 | 18.4 | 17.4 | 13.8 | 10.2 | 6.5 | 2.8 |
| Class 300 | 48.0 | 45.3 | 42.5 | 38.7 | 32.6 | 11.1 |
| Class 600 | 96.0 | 90.7 | 85.1 | 77.4 | 65.2 | 22.1 |
| Class 900 | 144.1 | 136.0 | 127.6 | 116.1 | 97.9 | 33.2 |
| Class 1500 | 240.1 | 226.7 | 212.7 | 193.4 | 163.1 | 55.4 |
| Class 2500 | 400.1 | 377.8 | 354.4 | 322.4 | 271.9 | 92.3 |
Standard class, bar. Material group: LCB. Greyed values are outside the material's service range (−46 … +343 °C). Flanged-end ratings end at 538 °C.
Service temperature
−46 °C+343 °C−200−1000100200300400500600700800
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
Fresh water
Seawater
Steam
Hydrocarbons, oil
Dilute acid
Caustic
Air, gas
Low temperature
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 down to −46 °C
- Economical low-temperature solution
Weaknesses
- Not used above 343 °C
- No corrosion resistance
Manufacturing and use
- ECONOMY
- Low; slightly more expensive than WCB (impact testing).
- MANUFACTURING METHODS
- Sand casting + heat treatment + impact testing
- TYPICAL VALVE PARTS
- Body · Bonnet
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 A352. Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.