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@gbj_tester
Can't be that hard to get, lots of stuff is/was built from 531, not just motorcycle frames but car spaceframes and aircraft parts (particularly engine subframes). There is a dedicated contact at Reynolds for motorsport projects.
On the other hand, it's an expensive proprietary product, and it's advantage over much cheaper generic 4130 CrMo is higher strength. In many applications, strength isn't the the overriding need, and once you've used enough 4130 to get the stiffness you need it turns out to be strong enough too.