Titanium alloy product having high strength and excellent cold rolling property

Patent metadata

Field	Value
Publication number	US-9273379-B2
Application number	US-201313869465-A
Country	US
Kind code	B2
Filing date	Apr 24, 2013
Priority date	Jun 18, 2012
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

A titanium alloy product according to the present invention: has a strength level higher than that of an existing titanium alloy product; can be successfully cold rolled (coil rolled); and is also provided with workability. In the titanium alloy product according to the invention, expensive alloy elements are not essentially required, and hence cost can be suppressed. The titanium alloy product according to the invention includes Al equivalent represented by (Al+10O (oxygen)): 3.5 to 7.2% (% by mass, the same hereinafter), Al: more than 1.0% and 4.5% or less, O: 0.60% or less, Fe equivalent represented by (Fe+0.5Cr+0.5Ni+0.67Co+0.67Mn): 0.8% or more and less than 2.0%, and one or more elements selected from the group consisting of Cu: 0.4 to 3.0% and Sn: 0.4 to 10%, in which the balance is Ti and unavoidable impurities.

First claim

What is claimed is:

1. A titanium alloy product, comprising:
Al: more than 1.0 mass % and 4.0 mass % or less;
O: 0.60 mass % or less;
one or more elements selected from the group consisting of Fe, Cr, Ni, Co, and Mn;
one or more elements selected from the group consisting of Cu: from 0.4 to 3.0 mass % and Sn: from 0.4 to 10 mass %; and
Ti,
wherein
Al equivalent represented by (Al+10O) is from 3.5 to 7.2 mass %;
Fe equivalent represented by (Fe+0.5Cr+0.5Ni+0.67Co+0.67Mn) is 0.8 mass % or more and less than 2.0 mass %; and
the titanium alloy product is an (α+β) titanium alloy material and does not comprise Mo or V.

2. The titanium alloy product according to claim 1 , further comprising
one or more elements selected from the group consisting of Si and C so that expression (1) is satisfied:
Si+5C <1.0   (1)

where Si and C represent mass % of Si and C, respectively, in the titanium alloy product.

3. The titanium alloy product according to claim 1 , comprising:
O: from 0.20 to 0.50 mass %.

4. The titanium alloy product according to claim 1 , wherein the Al equivalent ranges from 4.0 to 7.0 mass %.

5. The titanium alloy product according to claim 1 , wherein the Al equivalent ranges from 4.3 to 6.5 mass %.

6. The titanium alloy product according to claim 1 , wherein the Fe equivalent ranges from 1.0 to 1.8 mass %.

7. The titanium alloy product according to claim 1 , which comprises one or more elements selected from the group consisting of Cu: from 0.4 to 3.0 mass % and Sn: from 0.4 to 2.5 mass %.

8. The titanium alloy product according to claim 2 , which comprises one or more elements selected from the group consisting of Si: 0.05 mass % or more and C: 0.03 mass % or more.

9. The titanium alloy product according to claim 1 , comprising:
Cu: from 0.4 to 3.0 mass %.

10. A titanium alloy product, consisting essentially of:
Al: more than 1.0 mass % and 4.0 mass % or less;
O: 0.60 mass % or less;
one or more elements selected from the group consisting of Fe, Cr, Ni, Co, and Mn;
one or more elements selected from the group consisting of Cu: from 0.4 to 3.0 mass % and Sn: from 0.4 to 10 mass %;
optionally one or more elements selected from the group consisting of Si and C; and
Ti,
wherein
Al equivalent represented by (Al+10O) is from 3.5 to 7.2 mass %;
Fe equivalent represented by (Fe+0.5Cr+0.5Ni+0.67Co+0.67Mn) is 0.8 mass % or more and less than 2.0 mass %;
when the one or more elements of Si and C are present, an amount of Si and an amount of C represented by Si and C in mass %, respectively, in the titanium alloy product satisfies expression (1):
Si+5C <1.0   (1); and

the titanium alloy product is an (α+β) titanium alloy material.

11. The titanium alloy product according to claim 10 , wherein an amount of O is from 0.20 to 0.50 mass %.

12. The titanium alloy product according to claim 10 , wherein the Al equivalent ranges from 4.0 to 7.0 mass %.

13. The titanium alloy product according to claim 10 , wherein the Al equivalent ranges from 4.3 to 6.5 mass %.

14. The titanium alloy product according to claim 10 , wherein the Fe equivalent ranges from 1.0 to 1.8 mass %.

15. The titanium alloy product according to claim 10 , wherein one or more elements selected from the group consisting of Cu: from 0.4 to 3.0mass % and Sn: from 0.4 to 2.5 mass % are present.

16. The titanium alloy product according to claim 10 , wherein one or more elements selected from the group consisting of Si: 0.05 mass % or more and C: 0.03 mass % or more are present.

17. The titanium alloy product according to claim 10 , comprising:
Cu: from 0.4 to 3.0 mass %.

Assignees

• Kobe Steel Ltd

Inventors

• Konno Takashi
• Sasaki Keita
• Itsumi Yoshio
• Oyama Hideto

Classifications

• C22F1/18

  High-melting or refractory metals or alloys based thereon · CPC title

• C22C14/00 Primary

  Alloys based on titanium · CPC title

• C22F1/183

  of titanium or alloys based thereon · CPC title