I have used EN24T with success for highly-stressed parts. Not sure what its composition is, but it has a UTS many times that of mild steel, but still turns fairly easily. It is readily available from various of our usual retail sources; if they don't have it in stock they will certainly get it for you. I can't remember offhand where I got mine from, but it would have been Mallard Metals or Noggin End Metals.

David

Hi Daniel ,

Slight alarm bells ringing over this – there are several ' Chrome Vanadium ' steels and they are mostly special purpose , require heat treatment and are generally more difficult to work than more common steels .

Bearing in mind that many published designs are prepared by people who have no technical knowledge whatever it is at least possible that specifying Chrome Vanadium steel was just a clever sounding random choice or a total mistake .

A steel that contains small amounts of Chrome and Vanadium among its ingredients but is readilly workable is gauge plate . This is suitable for many model engineering purposes and perhaps this is what was intended .

You don't tell us exactly what from are making but there are not many model engine parts that cannot be made from gauge plate or steels like EN8 and EN24 as David suggests .

MikeW

For those components I'd be amazed if bog standard mild steel wasn't strong enough. It worked on my 5"g locos, and hundreds of others. If you want something a bit stronger then EN8, but I can't see that it's necessary

My guess is all those parts could be from one piece of gauge plate. Easy to harden & temper.

Neil