The Reynolds USA website gives the chemical composition of 531 and 753 as
identical. See http://www.reynoldsusa.com/
Of course, Reynolds USA could be wrong. I'm not being sarcastic, I KNOW they're wrong about some stuff!
Mark Bulgier Seattle, Wa USA
Mark Bulgier wrote:
> I could just about swear that I heard from Reynolds that 531
> and 753 were the same alloy, only different in the heat-treatment.
> [snip]
> I was also told (can't remember by whom though) that the idea that
> 5-to-3-to-1 was a formula of some kind was never really true,