| 摘要 |
PURPOSE:To enable rolling not causing herringbone and stripe pattern as well as intermediate elongation and earing to a sheet by specifying rolling tension, total draft in each cold rolling stage and conditions during reduction in each pass in <=1mm thickness. CONSTITUTION:A hot rolled or cold rolled plate of high strength pure Ti having >=46kgf/mm<2> tensile strength is annealed and repeatedly passed through cold rolling, annealing and pickling stages to manufacture a sheet. At this time, rolling tension is regulated to 15-30kgf/mm<2> and total draft in each cold rolling stage to 10-40%. Draft in each pass in <=1.0mm thickness is regulated to <=10% and the degree of reduction is lowered in a later pass. By this method, the high strength pure Ti plate can be cold rolled to a sheet having satisfactory flatness without causing ear cracking, intermediate elongation, ear waving, herringbone or stripe pattern.
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