Hardness of stainless steel valves
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What should be the hardness range for the stem, seat, and disc of stainless steel valves?
If there is no standard writing, then it is not controlled. . . Especially when no solution treatment is required. If solubility requirements apply, it is generally below HB190.
I don’t think there’s any standard for this; stainless steel needs to undergo solution treatment
By examining the domestic standard GB/T12234 and the API600 standard, it can be seen that these standards specify requirements regarding the hardness of valve stems; there are no such requirements for the hardness of valve plates and valve discs. However, there are requirements for the hardness of the sealing surfaces on valve plates and valve discs. The API600 standard requires that the hardness of all stainless steel valve stems and sealing surfaces comply with the manufacturer’s standards; according to GB/T12234, the hardness of chromium stainless (Cr13) steel should be between HB200 and 275, while the minimum hardness required for sealing surfaces is HB250.
Domestic standard, similar to API
Eager to help others, but the best **settings have not been found