SA240 409 S/S spec change

[alexx]

Hi,

The latest version of SA240 now specifies that 409 S/S is obsolete and replaced with 40910, 40920 or 40930. The differences between them being different amounts of Ti and Cb. The mill can provide either of these standards when 409 S/S is order under the A240 specification.

Has anyone investigated the benefits offered by the different types. I suspect benefits are in formability and corrosion resistance.

Thanks,

 

[NickE]

I would also hazard a guess that the Ti and Cb stabilize the alloy also.

 

[EdStainless]

The various mfg and users of 409 in automotive exhaust would like you to believe that the different stablizations have different impacts on the weldability/formability/corrosion resistance.
Let's just say that I am a skeptic, since swearing would be very unprofessional.
Stabilized 409 is good, how they do it really doesn't matter.


= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.

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