WCB is the standard cast carbon steel specification for valve bodies in general process service. It handles hydrocarbons, water, steam and inert gas across a wide temperature band, it is weldable and repairable, and it is cheap enough that plants buy spares without much deliberation. That combination is why WCB bodies dominate surplus inventories.
WCB is not suitable for sour service without qualification, and it does not tolerate strong acids or chlorides. A WCB valve that came out of a chemical unit may have a perfectly sound body and a trim that is finished, so we always ask what the valve was in before we price it.
Review points
What decides the value of wcb carbon steel valves
Trim is separate
A WCB body with 316, 13% chrome or stellite trim is common. The trim often outvalues the body.
Sour service
WCB valves are not automatically NACE compliant. If the valve is marked for sour service, say so.
Repairability
WCB bodies can be weld repaired, which keeps used valves in the rebuild market.
Selling it
How to present the lot
Count by size and pattern, and note the marking on the body. If you have certificates, include them; if you do not, say so rather than implying they exist.
Do not separate trim from bodies to sell them individually unless the trim is clearly identifiable and valuable on its own. In most cases the assembly is worth more together.
Questions sellers ask
Is WCB the same as A216 WCB?
Yes. A216 is the ASTM specification and WCB is the grade within it. Valve nameplates usually show both.
Do you buy WCB valves with damaged flanges?
Sometimes, as body and bonnet. Flange damage is the most common reason a large WCB valve loses value.
What class is most common?
Class 150 and 300 dominate general process and utility service. Class 600 and above appear in higher-pressure process duty.