Ah, yes. this is a particular problem in Russian, as I believe bulat means both cast steel and crucible steel. Primarily it is semantics: by definition cast steel is cast, ie: poured into a mold. In cast steel, usually premade steel is remelted in a crucible, rather than made in it.
Crucible steel is steel made in a crucible. Traditionally it is not cast (poured). However, what happens if the craftsmen put too much carbon into his crucible? The product can be cast iron. There is really no reason why a tradtional craftsmen could not have "cast" crucible steel or "cast iron". Just lack of evidence. Casting crucible steel would cause quick solidification, small dendrites and probably no pattern. But it could be done.