Well, because I really want a frame for this project that can be left bare and not rust...... I would surely do the 4130 if the object was adequate strength with very light weight
I am reasonably sure that 316B is what the builders of stainless frames use but you very well may be right about...
I have been looking at some of the super duplex alloys and although I haven't ruled out doing Titanium, stainless would be easier to weld without difficult complications as the assembly becomes too large to avoid chamber welding.
Is 316B the logical and wisest choice for a tubular motorcycle...
