Non-magnetic Stainless Steel?

FP: I don't know if factory car antennas are ferrous or non-ferrous. I was primarily talking about about aftermarket RF antennas when i made that comment. I would be curious to find this out myself. I'll test mine and let you know tomorrow : ) Sean
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300 series stainless is non magnetic, while 400 series IS magnetic. I think it has to do with whether or not there is any nickel content.

Trivia - stainless steel was discovered at a plant in northern Indiana. Test alloys were stored outside, one day a janitor got curious and asked why a particular piece of steel that had been out in the weather for quite a while wasn't rusted. Doubt that his name made it on the patent though.
Ok not audio related, just always thought it was a neat story.

Carefull, what people think is stainless steel is often just chrome electroplated steel. Ex. some cutlery and antennae on automobiles. That might explain the "magnetic" qualities of some "stainless steels". It is mostly the nickel in stainless steel that give it its "non-corrosion" properties. Nickel is non-ferrous (obviously!) and non-magnetic.

Bob P.