Titanium thin sheet

Abstract

A titanium thin sheet of 0.2 mm or less in thickness, containing: Fe of 0.1 mass % or less and O (oxygen) of 0.1 mass % or less in a bulk, wherein a sheet thickness (mm)/a grain size (mm) ≧3, and the grain size ≧2.5 μm are satisfied, and a hardened layer is included at a surface, and a region of the hardened layer is a depth of 200 nm or more and 2 μm or less from the surface. The titanium thin sheet is supplied with excellent workability and high surface hardness, and is able to be suitably used for various purposes such as, for example, acoustic components (a speaker vibration plate and so on).

1 . A titanium thin sheet of 0.2 mm or less in thickness, containing:
 Fe of 0.1 mass % or less and O (oxygen) of 0.1 mass % or less in a bulk,   wherein a sheet thickness (mm)/a grain size (mm) ≧3, and the grain size ≧2.5 μm are satisfied, and   a hardened layer is included at a surface, and a region of the hardened layer is a depth of 200 nm or more and 2 μm or less from the surface.   
     
     
         2 . The titanium shin sheet according to  claim 1 ,
 wherein after a cold-rolling, a finish annealing is performed at 500° C. or more and 850° C. or less by a BAF or a continuous annealing.