304 stainless steel (sa249) versus a409 stainless steel
304 stainless steel (sa249) versus a409 stainless steel
(OP)
can anybody give me a quick difference between sa249 and a409 stainless steel tubes. comparing strength, max working temp and pressures, etc...





RE: 304 stainless steel (sa249) versus a409 stainless steel
What sort of application do you have in mind?
Start with the blue sheets from Alleagheny Ludlum.
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Plymouth Tube
RE: 304 stainless steel (sa249) versus a409 stainless steel
I think this is in reference to ASTM A 409/A 409M Standard Specification for Welded Large Diameter Austenitic Steel Pipe for Corrosive or High-Temperature Service, which is similar to ASTM A 249/A 249M Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes.
RE: 304 stainless steel (sa249) versus a409 stainless steel
To start with the scope of each, A249 only apples to 1/8" though 12" and A409 covers NPS 14 through 30.
The biggest difference is that A409 has provision for welding with filler metal, A249 requires all autogenous welds.
The only NDT in A409 is a pressure test, A249 has provision for Eddy Current testing.
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Plymouth Tube
RE: 304 stainless steel (sa249) versus a409 stainless steel