You could collect some shavings of the metal and have it analyzed to know what alloying materials are there and in what proportions. You'd probably need to do the same with a known sample of 753 and some other steels for comparison purposes. No doubt a frightfully expensive proposition unless you know of a graduate student in metallurgy with some time on their hands and ready access to some pretty fancy analytical equipment.
Charlie "former neutron activation analysis tech" Young Honeybrook, PA
> I there a way to ID a bike built with this tubing? NO decal is present
> BOB FREITAS
> MILL VALLEY,CA