Patent US4551182A successfully refreshed from Google Patents.
US4551182A
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US
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Process for producing deep-drawing cold rolled steel sheets and strips
Assignee: Nippon Steel Corp
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Filing: 1982-10-27
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Granted: 1985-11-05
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Expires: 2002-10-27
Abstract
Abstract Disclosed is a process for producing titanium-containing cold rolled steel sheets and strips which can stand very severe press forming, which process comprising hot rolling, coiling at a temperature not lower than 700 DEG C., cold rolling and continuous annealing at a temperature, from 700 DEG to 900 DEG C., for 20 seconds to 2 minutes.
Inventors
- 👤 Osamu Akisue
- 👤 Teruaki Yamada
- 👤 Shigeru Ueda
- 👤 Yoshikuni Tokunaga
- 👤 Masato Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:23
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/14; C21; C21D; C21D8/00; C21D8/02; C21D8/04; C21D8/0421; C21D8/0426; C21D8/0436
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
A process for producing deep-drawing cold rolled steel strips, comprising: hot rolling a steel consisting essentially of 0.0014-0.0031% carbon, 0.010-0.100% aluminum and titanium in amounts not less than 4 times the carbon content, but within a range of from 0.019-0.052%, 0.0019-0.0038% nitrogen with the balance being iron and unavoidable impurities; coiling the hot rolled strip thus obtained at a temperature not lower than 700° C.; and subjecting the coiled strip to cold rolling and then continuous annealing including a soaking step in a temperature range of from 700° to 900° C. for 20 seconds to 2 minutes.
Claim 2
Dependent Claim
97 words
A process for producing deep-drawing cold rolled steel strips, comprising: hot rolling a steel consisting essentially of 0.0014-0.0031% carbon, 0.010-0.100% aluminum and titanium in amounts not less than 4 times the carbon content, but within a range of from 0.019-0.052%, 0.0019-0.0038% nitrogen with the balance being iron and unavoidable impurities; coiling the hot rolled strip thus obtained at a temperature not lower than 700° C.; and subjecting the coiled strip to cold rolling and then continuous annealing including a soaking step in a temperature range of from 700° to 900° C. for 20 seconds to 2 minutes.
Claim 3
Dependent Claim
21 words
A process according to claim 1 in which the cold rolling is done with a reduction ranging from 70 to 85%.
Claim 4
Dependent Claim
41 words
A process according to claim 1 in which the coiling of the hot rolled steel strip is done at an ordinary temperature and the strip thus coiled is reheated to a temperature not lower than 700° C. in a separate line.
Claim 5
Dependent Claim
18 words
A process according to claim 1 wherein the titanium is not less than 6.3 times the carbon content.
Claim 6
Dependent Claim
17 words
A process according to claim 4 wherein the titanium is 6.3 to 37.1 times the carbon content.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |