Aiming to enhance corrosion resistance of steel cup, the formability of pure titanium clad sheet by multistage deep drawing was investigated. Since pure titanium has excellent corrosion resistance, the use of the pure titanium sheet is very effective as the anticorrosion coating for steel. The blank was constituted by interposing steel between two sheets of pure titanium sheets. In the experiment, the materials were pure titanium sheets TP270, ultralow-carbon steel SPCC, and stainless steel SUS316L. The initial thickness of the sheet was 0.2 to 0.5 mm in thickness. A total plate thickness of the blank was 1.0 mm. In the deep drawing process, the blank was employed and a flat sheet blank was formed into a circle by a punch. Various cups were drawn by exchanging the punch and die. The die was a conical shape without a blankholder in the subsequent stages. For the prevention, pure titanium blank was treated by oxide coating. By this method, the fresh and clean titanium is not in direct contact with the die during the forming due to the existence of the oxide layer. By oxide coating, the titanium sheet has sufficient ability in preventing the seizure in multistage deep drawing. It was found that the titanium clad cups were successfully drawn.
