TITANIUM MATERIAL FOR HOT ROLLING AND MANUFACTURING METHOD THEREOF

摘要

Provided are a titanium material for hot rolling with which surface defects (including side surfaces and edge parts, in addition to plate surfaces in the case of a plate or a band coil) can be reduced and a manufacturing method thereof, and particularly a titanium material for hot rolling and a manufacturing method thereof with which an ingot breakdown step can be eliminated. The titanium material for hot rolling has dimples, wherein the average height (Wc) of profile curvilinear elements of waves imparted by cold plastic deformation is 0.2-1.5 mm and the average length (WSm) is 3-15 mm, and surface defects that occur during hot rolling can be reduced even when the ingot breakdown step is eliminated. The aforementioned dimples are formed by means of cold plastic deformation of the surfaces of the titanium material for hot rolling using a steel tool having a front end shape with a curvature radius of 3-30 mm or a steel ball having a radius of 3-30 mm.