Temperature and Pressure Considerations
Valve material selection starts with understanding the operating temperature and pressure. Carbon steel (WCB) is suitable for temperatures up to 425°C, while chrome-moly alloy steels (WC6, WC9, C5) are required for higher temperatures. For sub-zero service, low-temperature grades like LCB and LCC provide guaranteed impact toughness.
- WCB: -29°C to 425°C, most common grade
- WC6: up to 540°C, 1.25Cr-0.5Mo
- WC9: up to 580°C, 2.25Cr-1Mo
- C5: up to 600°C, 5Cr-0.5Mo
- LCB: down to -46°C, low-temperature carbon steel
