(57) The present invention provides a β type titanium alloy characterized by consisting of, by mass %, V: 15 to 25%, Al: 2.5 to 5%, Sn: 0.5 to 4%, O (Oxygen):
not more than 0.20%, H: not more than 0.03%, Fe: not more than 0.40%, C: not more
than 0.05% and N: not more than 0.02%, and the balance Ti and impurities. The present invention also provides a method of manufacturing a β type titanium alloy
characterized by comprising the following steps (a) to (c):
(a) Preparing a β type titanium alloy consisting of, by mass %, V: 15 to 25%, Al:
2.5 to 5%, Sn: 0.5 to 4%, O (Oxygen): not more than 0.20%, H: not more than 0.03%,
Fe: not more than 0.40%, C: not more than 0.05% and N: not more than 0.02%, and the
balance Ti and impurities.
(b) Pickling the β type titanium alloy in an aqueous solution including 3 to 40 mass
% of HF, and
(c) Further pickling the β type titanium alloy in an aqueous solution including 3
to 6 mass % of HF and 5 to 20 mass % of HNO3.
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