(21-05-2021, 02:24 PM)Alan Wrote: There is nothing special about EN40B. It’s simply a medium tensile chromium steel that nitrides well and has good wear and fatigue properties. In the past cranks were advertised as EN40B to persuade people they were getting something special, they weren’t but it stuck in their mindset. It’s simply the European way of describing a particular specification. Other countries describe it differently. There are viable alternatives. 722M24 if I remember is identical. I think it’s a great shame that this project won’t go ahead because of ill informed public opinion. But, Tony, thanks for trying.
Quite right Alan.
I don't think that the PR issue is insurmountable but I fully understand your reticence at laying down your own cash.
I bet that if you looked at the material used to make many cranks sold as "EN40B" the material certification would be dual labelled EN40B/ 722M24. Actually in strength terms there's little difference between EN40B and EN24T but the nitriding capacity gives better wear and fatigue, not that either is much of a benefit in most old car use cases.
Ignorance is a big problem in the modern world.
Charles