US3879232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing non-ageing cold rolled steel sheets having good press-formability by continuous annealing
Assignee: Nippon Steel Corp
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Filing: 1973-11-15
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Granted: 1975-04-22
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Expires: 1993-11-15
Abstract
Abstract A method for producing a cold rolled steel sheet (strip) having both non-ageing property and excellent press formability by continuous annealing.
Inventors
- 👤 Hisashi Gondo
- 👤 Hiroshi Takechi
- 👤 Mitsunobu Abe
- 👤 Kazuo Namba
- 👤 Hiroaki Masui
- 👤 Norimasa Uehara
- 👤 Kunihiko Komiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:34
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/04; C21D8/0421; C21D8/0426
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
36 words
A method for producing a cold rolled steel sheet having non-ageing properties and press-formability comprising hot rolling a steel containing not more than 0.015% of carbon, and containing manganese, aluminum, sulfur, oxygen and nitrogen and wherein
Claim 2
Independent Claim
36 words
A method for producing a cold rolled steel sheet having non-ageing properties and press-formability comprising hot rolling a steel containing not more than 0.015% of carbon, and containing manganese, aluminum, sulfur, oxygen and nitrogen and wherein
Claim 3
Independent Claim
36 words
A METHOD FOR PRODUCING A COLD ROLLED STEEL SHEET HAVING NON-AGEING PROPERTIES AND PRESS-FORMABILITY COMPRISING HOT ROLLING A STEEL CONTAINING NOT MORE THAN 0.015% OF CARBON, AND CONTAINING MANGANESE, ALUMINUM, SULFUR, OXYGEN AND NITROGEN AND WHEREIN
Claim 4
Independent Claim
36 words
A METHOD FOR PRODUCING A COLD ROLLED STEEL SHEET HAVING NON-AGEING PROPERTIES AND PRESS-FORMABILITY COMPRISING HOT ROLLING A STEEL CONTAINING NOT MORE THAN 0.015% OF CARBON, AND CONTAINING MANGANESE, ALUMINUM, SULFUR, OXYGEN AND NITROGEN AND WHEREIN
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the percentage of Mn is not more than 0.15.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein the percentage of Al is not more than 0.06.
Claim 7
Dependent Claim
25 words
The method of claim 1 wherein the percentage of Mn is not more than 0.15 and the percentage of Al is not more than 0.06.
Claim 8
Dependent Claim
16 words
The method of claim 4 wherein the amount of carbon is not more than 0.008 percent.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein the finishing temperature is between 700* to 880*C.
Claim 10
Dependent Claim
15 words
The method of claim 1 wherein the coiling temperature is between 400* to 550* C.
Claim 11
Dependent Claim
26 words
The method of claim 1 wherein after hot rolling, the hot rolled sheet is cooled to the coiling temperature at a rate between 10* and 100*C/sec.
Claim 12
Dependent Claim
30 words
The method of claim 1 wherein during the continuous annealing, the sheet is subjected to tensile or bending stress to produce 1 to 3 percent permanent strain in the sheet.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |