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Just a quick addition to this:
For exhaust manifolds where intergranular corrosion may be possible due to Chromium Carbide precipitation, it is better to use 321 SS. It uses a titanium addition which acts as a carbide stabilizer. Also, 321 has a higher hot strength than 304.
So, if you are buying an exhaust manifold made out of 304L, maybe ask the vendor if they can do it out of 321 instead.
Eric
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