I used to get mine as offcuts from aircraft material suppliers. As long as it didn’t need to be certified it wasn’t expensive in that form.
Is this to be used in a steel or other dissimilar metal sleeve or somesuch, and where there is a possibility of failure being catastrophic?
I may be telling my granny, in which case I apologise, but it galls like fury and is very notch sensitive, so tool tip radii are important and the surface finish needs to be spot on. Also it can work harden badly, rather like stainless, so that last cut for diameter can’t be tiddly steell type finsher! Horrible stuff!
I have a hangover from my racing days – about 8″ long and 1″ square. Do you want it? Grade unspecified, but it is most certainly Titanium – grinds with its bright white spark and all.