The terms WCA, WCB, and WCC refer to steel grades commonly used in the context of castings, specifically for valve components in industrial applications. These grades are often associated with ASTM standards for material quality, typically related to cast carbon steel. Here’s a breakdown of each:

1. WCA (ASTM A216 Grade WCA)

• WCA is a cast carbon steel used for valve components that require moderate strength and good corrosion resistance.
• It is typically used in low-temperature applications or general industrial service.
• It has good mechanical properties, including strength and ductility, which make it suitable for fluid handling systems.

2. WCB (ASTM A216 Grade WCB)

• WCB is one of the most common grades of carbon steel castings, widely used in the manufacturing of valves, flanges, and fittings.
• This grade provides higher strength and improved resistance to high temperatures compared to WCA.
• It is often used in steam, gas, and oil service applications where moderate to high temperatures and pressures are encountered.
• WCB is generally the preferred choice for high-temperature applications, such as those found in power plants and petrochemical industries.

3. WCC (ASTM A216 Grade WCC)

• WCC is a cast carbon steel with higher strength and temperature resistance than WCA and WCB.
• It is used for high-pressure and high-temperature applications, including steam turbines and critical valve components.
• WCC is typically employed in industries such as petrochemical, power generation, and refining, where equipment needs to withstand high stress and elevated temperatures.

Comparison:

• WCA is more suitable for low- to moderate-temperature applications.
• WCB is used for medium temperature and pressure applications, offering a good balance between strength and toughness.
• WCC is used for high-pressure and high-temperature environments, requiring materials with excellent strength and resistance to thermal cycling.

All three grades are part of the ASTM A216 standard, which defines carbon steel castings for use in pressure-containing parts, like valves, flanges, and fittings, under varying pressure and temperature conditions.