Valves made of A216WCB/304 material
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What does it mean when the valve material is specified as A216WCB/304? Is it one the material of the valve body and the other the material of the valve core?
That’s correct; the valve body is cast from carbon steel, while the valve core is made of 304 stainless steel
The valve body is equivalent to cast steel grade 25, with a carbon content of no more than 0.30%; the valve core is made of 304 stainless steel
A216WCB means that the material of the valve body is ordinary 25# carbon steel, while 304 indicates that the material of the valve core is 304 stainless steel.
304 may be the material for the valve core or the valve seat.