Watch part
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United States of America Patent
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Sep 14, 2021
Grant Date -
Nov 19, 2020
app pub date -
Aug 28, 2018
filing date -
Aug 28, 2017
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Abstract
A watch part containing a titanium alloy, the titanium alloy, in mass %, includes: Al: 1.0 to 3.5%; Fe: 0.1 to 0.4%; O: 0.00 to 0.15%; C: 0.00 to 0.10%; Sn: 0.00 to 0.20%; Si: 0.00 to 0.15%; and the balance: Ti and impurities, an average grain diameter of α phase crystal grains is 15.0 μm or less, an average aspect ratio of the α phase crystal grains is 1.0 or more and 3.0 or less, and a coefficient of variation of a number density of β-phase crystal grains distributed in the α phase is 0.30 or less.
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