CAST TITANIUM SLAB FOR USE IN HOT ROLLING AND EXHIBITING EXCELLENT SURFACE PROPERTIES AFTER HOT ROLLING EVEN WHEN OMITTING BLOOMING AND PURIFYING STEPS AND METHOD FOR PRODUCING SAME

摘要

A titanium casting piece for hot rolling comprising a pure titanium or titanium alloy for industrial use, characterized in that it has a texture refinement layer formed on the outermost surface by a melt recontour treatment on the surface to be a rolled surface, The depth of which is 5 mm or more and less than 9 mm. The titanium casting piece for hot rolling according to the present invention has a flat surface, less inner microvoids just below the surface, and a very fine texture on the outermost surface. It is possible to stably prevent occurrence of recesses on the surface at the initial stage of hot rolling or surface flaws on the hot rolled sheet at a practical level.