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Re: Is this stainless steel? [Re: atikovi] #5394635 04/05/20 03:12 PM
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Char Baby Offline
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Your magnet(if strong enough) may be picking up the mufflers steel pipe underneath.


Retired 6 yrs now & lovin' it
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
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Re: Is this stainless steel? [Re: atikovi] #5394648 04/05/20 03:33 PM
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In an inconspicuous area, apply a drop of muriatic acid or concrete cleaner to the surface. Wait half an hour. If there's dark discoloration it's stainless.

Re: Is this stainless steel? [Re: atikovi] #5394657 04/05/20 03:42 PM
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Ihatetochangeoil Offline
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Originally Posted by atikovi
So what would have Ford used 20 years ago?


My opinion is the cheapest thing that would look good. Definitely NOT 300 series stainless; too expensive, besides, you said it's magnetic, so it's NOT 304. Regardless if it is 400 series stainless (which I doubt), you just embedded rust into it if you used a carbon steel wire brush on it. You use a stainless wire brush on stainless.
If not knowing what type of steel it is keeps you awake at night, but you're not willing to pay a testing laboratory to use a PMI gun on it, you can identify a lot of basic materials with spark testing using a grinding wheel, these videos aren't very long and may help satisfy your curiosity: https://www.youtube.com/watch?v=GnSBSKTC834 https://www.youtube.com/watch?v=oId-fXqk5mU You can probably obtain different types of material at a local nonferrous scrap yard. Hit them with a grinder and you can QUICKLY tell the difference in sparks from stainless vs mild steel. IF you find that it IS stainless, which would also mean it's aftermarket, and you want it to look nice, go someplace that sells welding supplies and buy a NEW stainless wire brush, or sanding materials made for stainless, and don't use your new tools on anything before touching your exhaust; once you hit carbon steel with them, don't ever go back to using them on stainless. They're contaminated.
Hope this helps you.

Re: Is this stainless steel? [Re: atikovi] #5394674 04/05/20 04:08 PM
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atikovi Offline OP
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Went over it with some sandpaper and wax, sprayed the inside flat black. Looks good enough and better than it first did.

[Linked Image from fototime.com]

Re: Is this stainless steel? [Re: Trav] #5394747 04/05/20 05:18 PM
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Originally Posted by Trav
There is magnetic stainless.

Quote
Ferritic Stainless Steels such as grades 409, 430 and 439.
Martensitic Stainless Steel such as grades 410, 420, 440.
Duplex Stainless Steel such as grade 2205.


+1

Stainless steel is magnetic, however, when nickel (Ni) is added to stainless steel the result is a non-magnetic form of stainless steel (called austenitic stainless steel).

Last edited by Kestas; 04/05/20 05:37 PM. Reason: Removed misinformation

Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: Is this stainless steel? [Re: atikovi] #5394775 04/05/20 05:48 PM
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Kestas Online Content
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Originally Posted by atikovi
So what would have Ford used 20 years ago?

20 years ago Ford was heavy into using 409 ss for exhaust systems, while the japanese were using 304 ss. I know, because I was doing a lot of work for Ford helping to develop exhaust materials at the time.

Re: Is this stainless steel? [Re: atikovi] #5394826 04/05/20 06:42 PM
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spk2000 Offline
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What kind of car is it? Different manufacturers use different grades of stainless but they are pretty much all stainless now. 400 grades do not add nickel and lower the chromium content to lower the price. Under normal conditions they last well beyond 10 years using 400 grades. Higher end cars like Mercedez, BMW, AUDI, Porsche, Lexus use 300 grades. 400 grades are slightly magnetic. 300 grades are not. If it is still an OE exhaust system you could call any dealer and ask them what the replacement service part is made of. Low end aftermarket tends to be galvanized and is much cheaper and at that point usually good enough as vehicle is well aged by then.


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Re: Is this stainless steel? [Re: atikovi] #5394852 04/05/20 07:09 PM
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sloinker Offline
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Knowing Ford it will be as cheap as possible to manufacture but charged dearly as an upgrade option.


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Re: Is this stainless steel? [Re: atikovi] #5394943 04/05/20 09:08 PM
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Trav is correct some grades of stainless is magnetic

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