Titanium alloy

Abstract

In order to provide a titanium alloy having more excellent corrosion resistance, a titanium alloy containing, in mass%, 0.010 to 0.300% of Fe, 0.010 to 0.150% of Ru, 0 to 0.10% of Cr, 0 to 0.30% of Ni, 0 to 0.10% of Mo, 0 to 0.10% of Pt, 0 to 0.20% of Pd, 0 to 0.10% of Ir, 0 to 0.10% of Os, 0 to 0.10% of Rh, 0 to 0.10% of one or more elements selected from among La, Ce and Nd in total, 0 to 0.20% of one or more elements selected from among Cu, Mn, Sn and Zr in total, 0.10% or less of C, 0.05% or less of N, 0.20% or less of O, and 0.100% or less of H, with the balance being Ti and impurities, the average value of A values in formula (1), which represents the component ratio of the elements contained in the beta-phase crystal grains, is in the range of 0.550-2.000, and the alpha-phase and the beta-phase are included.

Description

technical field [0001] The present invention relates to a titanium alloy. Background technique [0002] Industrial pure titanium exhibits excellent corrosion resistance even in seawater where general-purpose stainless steel such as SUS304 corrodes. Therefore, industrial pure titanium is used in seawater desalination equipment and the like by utilizing such high corrosion resistance. [0003] On the other hand, industrial pure titanium is sometimes used as a material for chemical equipment in an environment such as hydrochloric acid that is more corrosive than seawater. In this environment, even industrially pure titanium is subject to significant corrosion. [0004] For this reason, use in a highly corrosive environment is envisaged, and a corrosion-resistant titanium alloy having corrosion resistance superior to that of industrial pure titanium has been developed. [0005] Patent Document 1 discloses a titanium alloy in which a reduction in corrosion resistance is suppre...

AI Technical Summary

Problems solved by technology

[0006] However, in these existing titanium alloys, local corrosion occurs in the intermetallic compound, the β phase itself, or around the intermetallic compound or the β phase, and the intermetallic compound and the β phase may fall off.

Therefore, in existing titanium alloys, localized corrosion of the intermetallic compound and the β phase itself, and loss of the intermetallic compound and the β phase due to localized corrosion around the intermetallic compound and the β phase occur. Localized corrosion, so there is room for improvement in terms of reduction in corrosion resistance

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