Steel on a sailboat mast . . . stainless, hi carbon, spring, hybrid or otherwise (lamposts??) . . . simply is not a logical choice.
It has been eloquently demonstrated by JH, and present company, that steel requires a relatively thick section throughout the mast''s length to equal the structural qualities of the aluminum alloy competitor that has less weight per foot. With the increase in weight and appreciative cost ratio . . . steel is more costly and increases the center of gravity.
Why even bother considering steel as a viable contender for sail applications?