I've read the difference in types of FeCrAl (kanthal) is the amount of aluminum in each one. I can't seem to find any proof of this. It's odd that 4.8%-5.8% can be the main difference when chromium and iron vary in higher numbers.
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FeCrAl wire composition
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Small differences in composition can change an alloy's properties quite a bit.
As far as why the chromium differences don't change the properties as much, part of it is that different elements have different effects on the alloy. For example a .1% difference in manganese can change the kanthal properties more than a 1% difference in chromium. Also a 1% difference in an element that is only 4-5% of the alloy is a bigger difference than a 2% difference in an element that makes up 20-22%.
As far as why the chromium differences don't change the properties as much, part of it is that different elements have different effects on the alloy. For example a .1% difference in manganese can change the kanthal properties more than a 1% difference in chromium. Also a 1% difference in an element that is only 4-5% of the alloy is a bigger difference than a 2% difference in an element that makes up 20-22%.
Thank you very much! I've been doing research for an article I'm writing on wire material used for vaping application, so this helps.
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