The valve material is alloy steel; what specific alloy is it?
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In the valve ordering specifications provided by the design institute, the material for the valves is specified as alloy steel, but it does not indicate which specific alloy it is. Could an expert tell me what the regulations are in this regard? I need a symbol table corresponding to valve materials; please help!
The range of alloy steels is too wide. Generally, the corrosion-resistant type is 304 ； The one resistant to high temperatures is 316L ； Wait. What are the operating conditions here? It’s best to ask the original design agency.
Common alloy steel valve body materials include: chromium-molybdenum steel (material code I), chromium-nickel stainless steel (material code P), chromium-nickel-molybdenum stainless steel (material code R), chromium-molybdenum-vanadium steel (material code V), etc., with the choice being determined by the operating conditions.
There must be a material number; otherwise, problems will arise. Moreover, even for alloys in the same series, the numbers vary. For example, SS304, A182 F304, and A351 CF8 are all referred to as SS304, so confusion must be avoided.
The specification for alloy steel is too vague; I think it would be possible to let the valve manufacturers choose the specific type during the bidding process.
Plain carbon steel – low-carbon steel, medium-carbon steel, high-carbon steel； Alloy steel – low-alloy steel, medium-alloy steel, high-alloy steel ； 16Mn is a low-alloy steel; you can ask the design institute whether it is an option Are those the ordering conditions for valves from the design institute? Are you kidding?
The range is too wide; common alloy steel valve body materials include chromium-molybdenum steel (material code I), chromium-nickel steel (material code P), chromium-nickel-molybdenum steel (material code R), chromium-molybdenum-vanadium steel (material code V), etc., with the choice depending on the operating conditions.
The condition provided by the design institute that the valve material is alloy steel is not standardized; it is necessary to ask them to specify the material code for the valve body, otherwise manufacturers will be unable to provide quotes during the bidding process.
It’s just that the person who wrote it didn’t explain it clearly, but it’s not impossible to solve. Taking electrocorrosion into account, the material used for valves should generally be better than that used for pipes. I’m sure your client has informed you about the material used for the pipes; selecting an appropriate material based on the available information and operational conditions shouldn’t be a problem.
It is necessary to specify the material code for the valve; for example, P usually refers to 321 or 316L, while I denotes chromium-molybdenum steel, and so on. If the design specifications are too general, it is impossible to determine the exact material. Last edited by auroral2006 on 2009-2-6 at 15:36.]