US4871400A
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Method for producing titanium strip having small proof strength anisotropy and improved ductility
Assignee: Nippon Steel Corp
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Filing: 1988-04-26
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Granted: 1989-10-03
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Expires: 2008-04-26
Abstract
Abstract A method for producing a titanium strip having a small proof strength anisotropy and an improved ductility comprises the steps of: reheating a hot rolled titanium strip containing 0.1% by weight or less of oxygen and 0.1 to 0.5% by weight of iron at a β region temperature and cooling by water, aging the obtained titanium strip at a temperature of 200° to 500° C. for 30 minutes or more, cold rolling the titanium strip at a rolling reduction of 30% or more; and, annealing the cold rolled titanium strip at a temperature of 600° to 800° C.
Inventors
- 👤 Takuji Shindo
- 👤 Hiromitsu Naito
- 👤 Makoto Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:24
CPC Classifications
C; C22; C22C; C22C14/00; C22F; C22F1/00; C22F1/16; C22F1/18; C22F1/183
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
107 words
A method for producing a titanium strip having a small proof strength anisotropy and an improved ductility, comprising the steps of: (a) reheating a hot-rolled titanium strip containing at most about 0.1% by weight of oxygen and 0.1 to 0.5% by weight of iron at a β region temperature and cooling by water; (b) aging the thus obtained titanium strip at a temperature of 200° C. to 500° C. for at least 30 minutes; (c) cold rolling the thus obtained aged titanium strip at a rolling reduction of at least 30%; (d) annealing the cold rolled titanium strip at a temperature of 600° C. to 800° C.
Claim 2
Independent Claim
107 words
A method for producing a titanium strip having a small proof strength anisotropy and an improved ductility, comprising the steps of: (a) reheating a hot-rolled titanium strip containing at most about 0.1% by weight of oxygen and 0.1 to 0.5% by weight of iron at a β region temperature and cooling by water; (b) aging the thus obtained titanium strip at a temperature of 200° C. to 500° C. for at least 30 minutes; (c) cold rolling the thus obtained aged titanium strip at a rolling reduction of at least 30%; (d) annealing the cold rolled titanium strip at a temperature of 600° C. to 800° C.
Claim 3
Dependent Claim
39 words
The method according to claim 1, wherein the hot rolled titanium strip further contains at least one element selected from the group consisting of boron, yttrium, and lanthanum in an amount in total of 0.05 to 0.3% by weight.
Claim 4
Dependent Claim
20 words
The method according to claim 1 or 2, wherein the content of oxygen ranges from 0.03 to 0.08% by weight.
Claim 5
Dependent Claim
20 words
The method according to claim 1 or 2, wherein the content of iron ranges from 0.2 to 0.3% by weight.
Claim 6
Dependent Claim
28 words
The method according to claim 1 or 2 wherein, reheating is carried out at a temperature ranging from β transus to 950° C. for 1 to 10 minutes.
Claim 7
Dependent Claim
24 words
The method according to claim 1 or 2, wherein aging is carried out at a temperature of about 300° C. for about 5 hours.
Claim 8
Dependent Claim
24 words
The method according to claim 1 or 2, wherein the cold rolling is carried out at a rolling reduction of from 40 to 70%.
Claim 9
Dependent Claim
20 words
The method according to claim 1, wherein the annealing is carried out at a temperature of 650° to 700° C.
Claim 10
Dependent Claim
19 words
The method according to claim 1, wherein the titanium strip further contains 0.05 to 0.3% by weight of Ce.
Claim 11
Independent Claim
120 words
A method for producing a titanium strip having a small proof strength anisotropy and an improved ductility, comprising the steps of: (a) reheating a hot rolled titanium strip which contains at most 0.1% by weight of oxygen and 0.1 to 0.8% by weight of an element selected from the group consisting of (i) copper, (ii) silicon and (iii) copper and silicon, and cooling by water; (b) aging the thus obtained titanium strip at a temperature of 300° C. to 600° C. for at least 30 minutes; (c) cold rolling the thus obtained titanium strip at a rolling reduction of at least 30%; and (d) annealing the thus cold rolled titanium strip at a temperature of 600° C. to 800° C.
Claim 12
Independent Claim
120 words
A method for producing a titanium strip having a small proof strength anisotropy and an improved ductility, comprising the steps of: (a) reheating a hot rolled titanium strip which contains at most 0.1% by weight of oxygen and 0.1 to 0.8% by weight of an element selected from the group consisting of (i) copper, (ii) silicon and (iii) copper and silicon, and cooling by water; (b) aging the thus obtained titanium strip at a temperature of 300° C. to 600° C. for at least 30 minutes; (c) cold rolling the thus obtained titanium strip at a rolling reduction of at least 30%; and (d) annealing the thus cold rolled titanium strip at a temperature of 600° C. to 800° C.
Claim 13
Dependent Claim
39 words
The method according the claim 10, wherein the hot rolled titanium strip further contains at least one element selected from the group consisting of boron, yttrium and lanthanum in an amount in total of 0.05 to 0.3% by weight.
Claim 14
Dependent Claim
21 words
The method according to claim 11, wherein the hot rolled titanium strip further contains 0.05 to 0.3% by weight of Ce.
Claim 15
Dependent Claim
25 words
A method according to claim 10 or 11, wherein, in a Ti-Cu series, the aging is carried out at a temperature of about 400° C.
Claim 16
Dependent Claim
25 words
A method according to claim 10 or 11, wherein, in a Ti-Si series, the aging is carried out at a temperature of about 550° C.
Claim 17
Independent Claim
125 words
The method for producing a titanium strip having a small proof strength anisotropy and an improved ductility comprising the steps of: (a) reheating a hot rolled titanium strip containing from 0.03 to 0.08% by weight of oxygen, 0.2 to 0.3% by weight of iron, 0.5 to 0.3% by weight, in total, of at least one element selected from the group consisting of boron, yttrium and lanthanum, and cooling by water; (b) aging the thus obtained titanium strip at a temperature of 200° C. to 500° C. for at least 30 minutes; (c) cold rolling the thus obtained titanium strip by rolling reduction ranging from 40% to 70%; and (d) annealing the thus cold rolled titanium strip at a temperature of 650° C. to 700° C.
Claim 18
Independent Claim
125 words
The method for producing a titanium strip having a small proof strength anisotropy and an improved ductility comprising the steps of: (a) reheating a hot rolled titanium strip containing from 0.03 to 0.08% by weight of oxygen, 0.2 to 0.3% by weight of iron, 0.5 to 0.3% by weight, in total, of at least one element selected from the group consisting of boron, yttrium and lanthanum, and cooling by water; (b) aging the thus obtained titanium strip at a temperature of 200° C. to 500° C. for at least 30 minutes; (c) cold rolling the thus obtained titanium strip by rolling reduction ranging from 40% to 70%; and (d) annealing the thus cold rolled titanium strip at a temperature of 650° C. to 700° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |