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1. (WO2018008151) TITANIUM SHEET AND PRODUCTION METHOD THEREFOR

Pub. No.:    WO/2018/008151    International Application No.:    PCT/JP2016/070303
Publication Date: Fri Jan 12 00:59:59 CET 2018 International Filing Date: Sat Jul 09 01:59:59 CEST 2016
IPC: C22F 1/18
C22F 1/02
C22C 14/00
C22F 1/00
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION
新日鐵住金株式会社
Inventors: MITSUDA, Koji
滿田 浩史
TAKAHASHI, Kazuhiro
▲高▼橋 一浩
SETO, Hideto
瀬戸 英人
Title: TITANIUM SHEET AND PRODUCTION METHOD THEREFOR
Abstract:
Provided is a titanium sheet with excellent moldability and a production method therefor. The titanium sheet is characterized in that: when the carbon concentration of a base metal is Cb (mass%) and the carbon concentration at a depth d µm from the surface is Cd (mass%), the depth d (the concentrated carbon layer thickness) satisfying Cd/Cb>1.5 is 1.0 µm to less than 10.0 µm; the Vickers hardness at the surface at a load of 0.245 N, HV0.025, is at least 200, the Vickers hardness at the surface at a load of 0.49 N, HV0.05, is lower than HV0.025, and the difference between HV0.025 and HV0.05 is at least 30; the Vickers hardness at the surface at a load of 9.8 N, HV1, is not more than 150; and the average spacing of cracks that occur on the surface when a 25% strain is applied in the rolling direction in the bulge-forming process is less than 50 µm, and the depth is 1 µm to less than 10 µm.