Valve material selection: A105
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Valves smaller than DN40 are made of A105 material, that is, forged steel. Is this necessary? Is it really necessary to use forged steel for such a small valve? Isn’t that a waste? In the absence of any special operating conditions, cast steel (WCB) would be sufficient
Its dimensions are not small, and especially under high temperature and pressure, the mechanical properties of cast steel become much worse!
It mainly depends on the operating conditions of the valve, not its size. Otherwise, it will be much worse
3# 19840307 Actually, the reply from above... For valves smaller than DN40, especially gate and globe valves, most manufacturers use a forged valve body to which the flange is then welded on. This is mainly due to production processes and costs; it is difficult to find gate valves with a diameter of less than DN40 that are manufactured using the WCB casting process in the market.
Small-sized ANSI valves are generally made of forged steel, while larger-sized ones are usually made of cast steel.
I still don’t quite understand. Could you explain it more clearly on the 3rd floor?
Since there are no special operating conditions, cast steel can be used entirely; forged steel is only used when high pressures are involved
Small-diameter valves, especially gate valves and globe valves, are available in cast steel and forged steel A105; for high pressures and stringent operating conditions, forged steel is a better choice. The drawback of castings is that the likelihood of sand holes appearing is relatively high.