Patent US3928083A successfully refreshed from Google Patents.
US3928083A
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Process for producing an enamelling steel sheet
Assignee: Nippon Steel Corp
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Filing: 1974-03-07
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Granted: 1975-12-23
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Expires: 1994-03-07
Abstract
Abstract A process for producing an enamelling steel sheet which comprises tapping molten steel with manganese content not more than 0.40%, lowering the carbon content in the molten steel to not more than 0.01%, adding titanium to the molten steel in an amount enough to obtain a titanium content between 0.01 and 0.3%, preferably between 0.03 and 0.1%, and also adding one or more of rare earth elements such as lanthanum, cerium, neodymium, praseodymium, and samarium (hereinafter called Rem) in total amount between 0.01 and 0.15%, preferably 0.02 and 0.12%, casting the molten steel into ingot or slab, hot rolling and then cold rolling the ingot or slab preferably at a cold rolling rate between 30 and 90% and then annealing the steel sheet.
Inventors
- 👤 Hisashi Gondo
- 👤 Hiroshi Takechi
- 👤 Kazuo Namba
- 👤 Matsuo Usuda
- 👤 Kouichi Kawasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:47
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/002; C21; C21D; C21D8/00; C21D8/02; C21D8/04; C22C38/14; C21D8/0421; C21D8/0426; C21D8/0436; C21D8/0447; C21D8/0473
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
102 words
A PROCESS FOR PRODUCING AN ENAMELLING STEEL SHEET WHICH COMPRISING TAPPING MOLTEN STEEL WITH A MANGANESE CONTENT OF NOT MORE THAN 0.40%, LOWERING THE CARBON CONTENT IN THE MOLTEN STEEL TO NOT MORE THAN 0.01%, ADDING TITANIUM TO THE MOLEN STEEL IN AN AMOUNT ENOUGH TO OBTAIN A TITANIUM CONTENT BETWEEN 0.01 AND 0.3%, AND ADDING ONE OR MORE ELEMENTS SELECTED FROM THE GROUP CONSISTING OF THE RARE EARTH ELEMENTS IN A TOTAL AMOUNT BETWEEN 0.01 AND 0.15%, CASTING THE MOLTEN STEEL INTO INGOT OR SLAB, HOT ROLLING AND THEN COLD ROLLING THE INGOT OF SLAB AND THEN ANNEALING THE STEEL SHEET.
Claim 2
Dependent Claim
102 words
A PROCESS FOR PRODUCING AN ENAMELLING STEEL SHEET WHICH COMPRISING TAPPING MOLTEN STEEL WITH A MANGANESE CONTENT OF NOT MORE THAN 0.40%, LOWERING THE CARBON CONTENT IN THE MOLTEN STEEL TO NOT MORE THAN 0.01%, ADDING TITANIUM TO THE MOLEN STEEL IN AN AMOUNT ENOUGH TO OBTAIN A TITANIUM CONTENT BETWEEN 0.01 AND 0.3%, AND ADDING ONE OR MORE ELEMENTS SELECTED FROM THE GROUP CONSISTING OF THE RARE EARTH ELEMENTS IN A TOTAL AMOUNT BETWEEN 0.01 AND 0.15%, CASTING THE MOLTEN STEEL INTO INGOT OR SLAB, HOT ROLLING AND THEN COLD ROLLING THE INGOT OF SLAB AND THEN ANNEALING THE STEEL SHEET.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the amount of titanium is between 0.03 and 0.1%.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the rare earth element is lanthanum, cerium, neodymium, praseodymium or samarium.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the amount of rare earth element is between 0.02 and 0.12%.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the cold rolling rate is between 30 and 90%.
Claim 7
Dependent Claim
121 words
A process for producing an enamelling steel sheet which comprises tapping molten steel with a manganese content ot not more than 0.40%, lowering the carbon content in the molten steel to not more than 0.01% by vacuum degassing, adding one or more elements selected from the group consisting of the rare earth elements to the steel in a total amount between 0.01 and 0.15%, prior to or at the same time of casting the steel into an ingot mold, leaving the steel after casting in the mold until an initial solidified layer is formed, adding titanium to the non-solidified portion so as to obtain a titanium content between 0.01 and 0.3%, and hot rolling, cold rolling and annealing the steel sheet.
Claim 8
Dependent Claim
121 words
A process for producing an enamelling steel sheet which comprises tapping molten steel with a manganese content ot not more than 0.40%, lowering the carbon content in the molten steel to not more than 0.01% by vacuum degassing, adding one or more elements selected from the group consisting of the rare earth elements to the steel in a total amount between 0.01 and 0.15%, prior to or at the same time of casting the steel into an ingot mold, leaving the steel after casting in the mold until an initial solidified layer is formed, adding titanium to the non-solidified portion so as to obtain a titanium content between 0.01 and 0.3%, and hot rolling, cold rolling and annealing the steel sheet.
Claim 9
Dependent Claim
17 words
The process of claim 6, wherein the amount of rare earth element is between 0.02 and 0.12%.
Claim 10
Dependent Claim
15 words
The process of claim 6, wherein the amount of titanium is between 0.03 and 0.1%.
Claim 11
Dependent Claim
120 words
A process for producing an enamelling steel sheet which comprises tapping molten steel with a manganese content of not more than 0.40%, lowering the carbon content in the steel to not more than 0.01% by vacuum degassing, leaving the steel after casting in an ingot mold until an initial solidified layer is formed, adding titanium and an element selected from the group consisting of one or more of the rare earth elements to the non-solidified portion in an amount to obtain a titanium content between 0.01 and 0.3%, and a total content of the rare earth elements between 0.01 and 0.15%, casting the steel into an ingot, hot rolling and cold rolling the steel, and then annealing the steel sheet.
Claim 12
Dependent Claim
120 words
A process for producing an enamelling steel sheet which comprises tapping molten steel with a manganese content of not more than 0.40%, lowering the carbon content in the steel to not more than 0.01% by vacuum degassing, leaving the steel after casting in an ingot mold until an initial solidified layer is formed, adding titanium and an element selected from the group consisting of one or more of the rare earth elements to the non-solidified portion in an amount to obtain a titanium content between 0.01 and 0.3%, and a total content of the rare earth elements between 0.01 and 0.15%, casting the steel into an ingot, hot rolling and cold rolling the steel, and then annealing the steel sheet.
Claim 13
Dependent Claim
15 words
The process of claim 9, wherein the amount of titanium Is between 0.03 and 0.1%.
Claim 14
Dependent Claim
17 words
The process of claim 9, wherein the amount of rare earth element is between 0.02 and 0.12%.
Claim 15
Dependent Claim
15 words
The process of claim 9, wherein the cold rolling rate is between 30 and 90%.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |