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.
Alan Fairless