Stainless Steel Exhaust Rusting? - Defender Source
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  #1  
Old June 8th, 2016, 08:32 PM
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Chris Davis
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Stainless Steel Exhaust Rusting?

In october I had my local muffler guy bend me up a stainless steel exhaust. I noticed today that not only is it covered in surface rust, but a magnet sticks to it just fine. Correct me if I am wrong--a stainless steel exhaust shouldn't be rusting and a magnet should not stick to it, correct? Of it it has a little iron in the stainless, it may stick, but only just slightly (maybe with a 304 or something)? Just double checking before I call him tomorrow...
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Old June 8th, 2016, 08:44 PM
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"Stainless" rusts. Only the really nice stainless does not rust. A borla will never rust. And NRP will.
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Old June 8th, 2016, 08:49 PM
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All depends what type & grade, some st/st is magnetic as it has a higher iron content. What did they quote you they would use ?
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Old June 8th, 2016, 09:09 PM
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Quote:
Originally Posted by evilfij View Post
"Stainless" rusts. Only the really nice stainless does not rust. A borla will never rust. And NRP will.
My original Borla rusted but they replaced it for free and I haven't had any issues (with the exhaust) since then.
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Old June 8th, 2016, 09:38 PM
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A quick google search said t409 and t304 are best. There are different types for different uses. Not all S/S is created equal. What grade did you get?
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Old June 8th, 2016, 09:44 PM
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John B.
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It is probably 409. It will be magnetic and will rust.
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Old June 8th, 2016, 09:53 PM
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Quote:
Originally Posted by rijosho View Post
My original Borla rusted but they replaced it for free and I haven't had any issues (with the exhaust) since then.

Interesting. The flanges rusted on mine but the pipes were perfect.
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Old June 8th, 2016, 10:03 PM
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The better stainless like 304 has greater nickel content and less iron... Less iron means less of the normal type of oxidation/rust.
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Old June 8th, 2016, 10:09 PM
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Yep, 400 series stainless. Martensitic stainlesses have inferior corrosion resistance compared to austenitic grades.

This is why I cringe when people say, "I got a stainless exhaust, man." Oversimplification

That said, the rust you see in 400 series exhausts can be removed quickly using mild phosphoric acid solution, which passivates the surface...for a while. Internally, the 400 series stainless is superior to mild steel, but cosmetically there is a price.
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Old June 8th, 2016, 10:44 PM
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316L or it will rust, which is made to order only.

I'm starting to come around to the hard logic, many have been trying sell me, that high quality galvi pipe last longer than 304 stainless pipe; for years I've been in denial....
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  #11  
Old June 8th, 2016, 11:44 PM
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304 should be fine as long as it is properly passivated after welding. 316 is a bit of overkill.

Zinc melts way below exhaust temperatures, so is not good coating.
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