1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Chassis material

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Old 06-29-24, 06:07 AM
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Chassis material

Hi All,

I was wondering if anyone has any information about the steel used in the construction of the FB chassis?

Thanks.
Old 06-29-24, 05:56 PM
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Aside from it not welding worth a flip?
Old 06-30-24, 02:42 AM
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Since you mentioned welding, this is actually a covert welding related question!
I have to do some rust repairs and I'm trying to find out what steel was used in the chassis so I can get a suitable steel to make my patch panels with.
Old 06-30-24, 09:33 AM
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Oh, just use whatever. It'll be fine.
Old 06-30-24, 10:03 AM
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For better or worse I'm an engineer, so that goes against my programming!!
Old 06-30-24, 05:46 PM
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If it makes you feel better, if it's some special grade of steel, you probably won't be able to buy it since that sort of thing is something the automakers contract with from their steel supplier.

They also have production abilities to stamp the panels out with big honking presses, a consumer grade steel is.nice to work with because it generally can be formed by us peons with hand tools I wouldn't discount that quality, either, as being able to make the shapes you want is probably more important. Of course the easy method is a pieces cut from an existing car.... but they all seem to rust in the same places... hmm, small problem here!


Most of the car seems to be 22 gauge, or obvs the Metric equivalent.

Last edited by peejay; 06-30-24 at 05:51 PM.
Old 07-01-24, 01:07 AM
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That's a fair point. My hope is to get the closest equilivent steel I can, but of course to do that I need a vague idea of what steel is in the chassis already. I know I'm probably overthinking this but it's just the way I am!
Old 07-01-24, 08:39 AM
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from 1981 Mazda used something called Super SZ Steel.
its been a while, but i think its a coating/galvanic process
Old 07-01-24, 09:54 AM
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Interesting, Super SZ steel is a new one on me! If you have any more information on it please let me know! Thanks.
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