AGGREGATE OF SPONGE TITANIUM GRAIN, BAR-SHAPED CONSUMABLE ELECTRODE FOR PLASMA ARC MELTING OR VACUUM ARC MELTING AND MASSIVE BRIQUETTE FOR ELECTRON BEAM MELTING USING THE SAME AS THE STOCK, AND METHOD FOR SELECTING SPONGE TITANIUM GRAINS AND SELECTING DEVICE THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide an aggregate of sponge titanium grains crushed and size-adjusted to a prescribed size, excellent in hanging resistance and moldability in cold rolling.;SOLUTION: Provided is an aggregate of sponge titanium grains in which a convex ratio being a ratio (Ap/Ach) between the projection area Ap obtained by projecting sponge titanium grains crushed and size-adjusted to a size of about 5 to 19 mm and mounted on a horizontally arranged flat board from the upper part along the normal of the flat board and the area Ach of a convex closure calculated from the projected shape is 0.84 or more, and also, the circularity of Wadell as a ratio (Lr/Lp) between the length Lp of the peripheral part of a projection figure calculated from the shape projected onto the flat board and the length Lr of the circumference of a circle having an area equal to the projection area Ap is 0.55 or more.;SELECTED DRAWING: Figure 4;COPYRIGHT: (C)2018,JPO&INPIT