Titanium sheet and method for producing the same
a technology of titanium sheet and ductile sheet, which is applied in the field of titanium sheet, can solve the problems of reducing the workability of titanium sheets, and deteriorating formability, and achieves the effects of reducing the variation of elongation of titanium sheets, sufficient strength, and excellent workability
Inactive Publication Date: 2019-07-25
NIPPON STEEL CORP
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Benefits of technology
The invention can make titanium sheets that have better strength and workability, which leads to better yields of processed goods. This is because it reduces the variation in how much the sheets can stretch.
Problems solved by technology
However, in general, when titanium materials are made to have high strengths, their workabilities drop.
In both cases, ductility is compromised with the increase in the strength, with which formability deteriorates.
However, as described above, a problem of decreased formability arises, and a good workability cannot be achieved.
Method used
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[0068]Pure titanium products of JIS Class 1 were repeatedly subjected to a cold rolling and an annealing, to be produced into titanium sheets. Table 1 shows chemical compositions and producing conditions of the titanium sheets.
[0069]In the table, a phrase “PREVIOUS COLD ROLLING” means cold rolling performed before the finish cold rolling, and a phrase “INITIAL COLD ROLLING” means cold rolling performed before the “previous cold rolling”. A phrase “PREVIOUS ANNEALING” means annealing performed before the finish cold rolling, and a phrase “INITIAL ANNEALING” means intermediate annealing performed before the “previous annealing”. Examples of a case where annealing durations are 1 min are examples simulating the continuous annealing, and examples of a case where annealing durations are 1 h or more are examples simulating the batch annealing. As an annealing atmosphere, an Ar gas was used except for Nos. 23 to 26 (comparative examples 10 and 11, examples 14 and 15), Nos. 24 and 25 were m...
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Abstract
A titanium sheet having a sheet thickness of 0.2 mm or less and including a hardened layer on a surface, the titanium sheet including a chemical composition containing, in mass percent: Fe: 0.001 to 0.08%; and O: 0.03 to 0.08%, wherein a grain size satisfies following Formulas (1) to (3), a thickness of the hardened layer is 0.1 to 2.0 μm. The titanium sheet has both a sufficient strength and an excellent workability. Formulas (1) to (3) are dave≥2.5 (1), t / dave≥3.0 (2), and t / dmax—1.5 (3), where, in Formulas (1) to (3), t denotes the sheet thickness (μm), dave denotes an average grain size (μm), and dmax denotes a maximum grain size (μm).
Description
TECHNICAL FIELD[0001]The present invention relates to a titanium sheet and a method for producing the titanium sheet. The titanium sheet refers to a titanium sheet having, for example, a sheet thickness of 0.2 mm or less.BACKGROUND ART[0002]Titanium materials have high specific strengths and excellent corrosion resistances and are widely used as a wide variety of starting materials for industrial use such as chemical plants and building materials, and as starting materials for consumer products such as camera bodies, timepieces, and sports equipment. Sheets such as foil having thicknesses of 0.2 mm or less are used as audio components (speaker diaphragms, etc.), anti-corrosion films / sheets, and the like.[0003]In general, there is a trend for metal materials to be required to have high strengths as well as to have workabilities. Titanium materials are no exception. However, in general, when titanium materials are made to have high strengths, their workabilities drop. Thus, attempts f...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C22F1/18C22C14/00C22F1/02
CPCC22F1/183C22C14/00C22F1/02C22F1/00C22F1/18
Inventor TAKEBE, HIDENORICHIDA, REITAMATSUMOTO, SATOSHI
Owner NIPPON STEEL CORP