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We don't know exactly how wootz steel was made. The artisans probably didn't either. We know it had something to do with tiny amounts of trace elements (fortunate ore), and something to do with the artisans' process.
Er, not quite? Wootz is crucible steel. The method has been experimentally reproduced and is fairly well understood. It's one of those things that wasn't so much 'lost' as 'wasn't made in Europe and so was mysterious to Europeans.'
It was, but there was some extra weirdness. Electron microscopes have revealed carbon nanotubes surrounding cementite in period Damascus steel swords. It leads to a higher carbon content and matching hardness without becoming brittle. Possibly 0.003% vanadium causes this.
That particular paper was disputed as being contamination on the part of the experimenters.
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