TITANIUM MOLDED PRODUCT FOR HOT ROLLING, HAVING EXCELLENT SURFACE PROPERTIES AFTER HOT ROLLING EVEN IN THE ABSENCE OF THE STAGE OF CLEANING AND STEED WAIST TREATMENT EVERYTHING IN THE ABSENCE OF THE STAGE OF THE CLEANING AND STEPS OF THE WAIST TREATMENT, THERE IS NOT EVERYTHING IN THE ABSENCE OF A STAGE OF CLEANING AND A STEP OF A WAX TREATMENT, THERE IS NOT EVERYTHING AT THE ABSENCE OF A STAGE OF CLEANING AND A STEP OF A TURNING PROCESS, IT'S CHURCH YOUR PROTECTION PROTECTION PROTECTION

摘要

A titanium cast product for hot rolling, made of marketable pure titanium or a titanium alloy, is proposed, wherein this cast titanium product includes on the surface serving as a rolling surface a fine-grained layer which constitutes a needle-like structure formed on the outer surface as a result of processing by melting and re-hardening, and which has a thickness greater than or equal to 5 mm and less than 9 mm in depth. In the titanium cast product for hot rolling according to the present invention, the surface is flat, the number of smallest cavities in the inner space immediately below the surface is small, and the outer surface has a largely thin structure. When the titanium cast product is hot rolled, the occurrence of concavities on the surface at the early stage of hot rolling and the occurrence of surface defects on the hot rolled sheet can be stably prevented at a practical level.