Selection of steam control valve spool?
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In the instrument data sheet provided by the design institute, under the column for steam control valves, the material used for the valve core and seat is usually 304 stainless steel clad with Stellite. Is it necessary to use Stel welding for this? Do all high-temperature media require Stellite cladding?
Stellite alloy? Is the temperature really high? Personally, I think it’s to increase hardness and wear resistance; is it meaningful to improve both at the same time?
Cladding with Stellite alloy is primarily done to increase wear resistance.
Steam also exerts a certain degree of erosion, so wear-resistant materials are required for the sealing surface
Stelai Baidu: The application of Stelai alloys in valves, with many papers on this topic. Kaichuan has also discussed this many times. Whether surfacing is required and what the thickness should be. This needs to be determined based on the specific operating conditions. High pressure difference, high flow rate, erosion – what other operating conditions are there? Go ahead and fill in the gaps – leave this question for you to find the answer to on your own!
It depends on the steam flow rate; when the flow rate is high, the impact of erosion must be considered, but this is not necessary under normal operating conditions.