Can the STL alloy, which is the material of the valve core, be used as a substitute for 13Cr?
Thread Content
As the title indicates, it’s a gate valve; the material specified for design is 13Cr. Can STL be used instead?
STL alloy is better than 13Cr...
The design requires that the valve core itself be made of 13Cr; using STL means welding STL cemented carbide on the surface of 13Cr, and of course STL is the better choice.
Under normal operating conditions, it definitely works.
STL cemented carbide; it’s not a valve stem – all valve stems are made of CR13
If the medium temperature is very high, STL can be used; however, STL is more expensive than 13CR. If the requirements of the operating conditions can be met with 13CR, there is no need to use STL
1. Stellite alloy (STL) possesses high dimensional stability, as well as very high wear resistance, corrosion resistance, oxidation resistance, and resistance to sulfidation. It is used for surfacing valve sealing surfaces in order to enhance the valves’ corrosion and wear resistance, thereby prolonging their service life. 2. National standard valve markings: Code for the material of the valve seat sealing surface or lining; Cr13 stainless steel is denoted as H, while Stellite alloy is denoted as Y. Example: Cr13 stainless steel sealed gate valve Z41H-25 ； Stellite alloy-sealed gate valve Z41Y-25.