MANUFACTURE OF PURE TITANIUM PLATE REDUCED IN ANISOTROPY OF 0.2 YIELD STRENGTH

摘要

PURPOSE:To manufacture the titled plate by counteracting, by means of the subsequent hot rolling, material anisotropy generated by the slabbing of pure Ti and also by controlling anisotropy generated by hot rolling so as to carry out rolling by a simple process and then annealing. CONSTITUTION:An ingot of pure Ti or a dummy slab (thickness t0), prepared by forging, of pure Ti is heated to a beta-phase region of =970 deg.C in a slabbing stage, which is rolled at =30% draft to be formed into a cold slab (thickness t1). Subsequently, this cold slab is reheated to a temp. of beta-transformation or below and then is rolled (thickness t2) so that final-rolling direction in hot rolling is perpendicular to the rolling direction in slabbing and a reduction cross ratio (t1/t2:t0/t1) is regulated to a range of 0.5-3.0. Successively, this rolled plate is cooled and then annealed.