On 2/4/2018 7:26 PM, Emanuel Berg wrote:
Frank Krygowski wrote:

FWIW, the fork that broke on our tandem was
Reynolds 531.

BTW I've heard that number (531) doesn't
specify some property of the steel but is
a designation/name so one can refer to
the product.

Yes. It's the name given by the Reynolds company to a particular alloy
of their steel.

https://en.wikipedia.org/wiki/Reynolds_531


--
- Frank Krygowski