US3867211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-oxygen, silicon-bearing lamination steel
Assignee: Armco Inc
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Filing: 1973-08-16
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Granted: 1975-02-18
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Expires: 1993-08-16
Abstract
Abstract A lamination steel of the carbon steel type for magnetic uses having a 60 hertz core loss of about 4 watts per pound at 15 kilogausses at a thickness of 0.025 in. if annealed after shearing or stamping and a core loss of about 4.5 watts per pound if used as sheared or stamped. The invention also relates to methods of making such steel. The steel contains from about 0.05% up to 0.60% silicon, from about 0.05% to 1.0% manganese, about 0.020% or less sulfur, from residual quantities up to about 0.15% phosphorus, about 0.008% or less nitrogen, about 0.02% or less oxygen, and a final carbon content of about 0.010% maximum. The final carbon content may be achieved in the melt, during processing or in an anneal performed by the customer. If the steel is fully-processed, it is preferred that the carbon be removed in the melt. The lamination steel may be processed by various routings, all including hot rolling, pickling and cold rolling to final gauge, to provide the customer with a fullyprocessed or semi-processed steel, as will be described hereinafter.
Inventors
- 👤 Robert W Easton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:45
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; C; C21; C21D; C21D8/00; C21D8/12; C21D9/00; C21D9/52
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
128 words
A steel of the carbon steel type for magnetic uses and producible by the manufacturer in fully-processed and semi-processed grades, said steel consisting essentially of from less than about 0.010% to about 0.1% carbon, from about 0.05% to about 1.0% manganese, about 0.02% maximum sulfur, from about 0.05% to 0.6% silicon, about 0.008% maximum nitrogen, about 0.02% maximum oxygen, about 0.15% maximum phosphorus the balance being iron and those impurities incident to the mode of manufacture, said steel having a 60 hertz core loss of about 4 watts per pound at 15 kilogausses at a thickness of 0.025 inch in said semi-processed grade and a 60 hertz core loss of about 4.5 watts per pound at 15 kilogausses at a thickness of 0.025 inch in said fully-processed grade.
Claim 2
Dependent Claim
128 words
A steel of the carbon steel type for magnetic uses and producible by the manufacturer in fully-processed and semi-processed grades, said steel consisting essentially of from less than about 0.010% to about 0.1% carbon, from about 0.05% to about 1.0% manganese, about 0.02% maximum sulfur, from about 0.05% to 0.6% silicon, about 0.008% maximum nitrogen, about 0.02% maximum oxygen, about 0.15% maximum phosphorus the balance being iron and those impurities incident to the mode of manufacture, said steel having a 60 hertz core loss of about 4 watts per pound at 15 kilogausses at a thickness of 0.025 inch in said semi-processed grade and a 60 hertz core loss of about 4.5 watts per pound at 15 kilogausses at a thickness of 0.025 inch in said fully-processed grade.
Claim 3
Dependent Claim
132 words
A steel of the carbon steel type for magnetic uses and producible by the manufacturer in fully-processed and semi-processed grades, said steel consisting essentially of from less than about 0.010% to about 0.1% carbon, from about 0.05% to about 1.0% manganese, about 0.01% maximum sulfur, from about 0.05% to about 0.60% silicon, about 0.005% maximum nitrogen, about 0.005% maximum oxygen, from about 0.05% to about 0.15% phosphorus, the balance being iron and those impurities incident to the mode of manufacture, said steel having a 60 hertz core loss of about 4 watts per pound at 15 kilogausses at a thickness of 0.025 inch in said semi-processed grade and a 60 hertz core loss of about 4.5 watts per pound at 15 kilogausses at a thickness of 0.025 inch in said fully-processed grade.
Claim 4
Dependent Claim
132 words
A steel of the carbon steel type for magnetic uses and producible by the manufacturer in fully-processed and semi-processed grades, said steel consisting essentially of from less than about 0.010% to about 0.1% carbon, from about 0.05% to about 1.0% manganese, about 0.01% maximum sulfur, from about 0.05% to about 0.60% silicon, about 0.005% maximum nitrogen, about 0.005% maximum oxygen, from about 0.05% to about 0.15% phosphorus, the balance being iron and those impurities incident to the mode of manufacture, said steel having a 60 hertz core loss of about 4 watts per pound at 15 kilogausses at a thickness of 0.025 inch in said semi-processed grade and a 60 hertz core loss of about 4.5 watts per pound at 15 kilogausses at a thickness of 0.025 inch in said fully-processed grade.
Claim 5
Dependent Claim
13 words
The steel claimed in claim 2 wherein said manganese content is about 0.45%.
Claim 6
Dependent Claim
17 words
The steel claimed in claim 2 wherein said silicon content is from about 0.10% to about 0.15%.
Claim 7
Dependent Claim
85 words
A fully-processed grade steel of the carbon steel type for magnetic uses consisting essentially of about 0.010% maximum carbon, about 0.05% to about 1.0% manganese, about 0.01% maximum sulfur, up to 0.6% maximum silicon, about 0.008% maximum nitrogen, about 0.01% maximum oxygen, from about 0.05% to about 0.15% phosphorus, the balance being iron and those impurities incident to the mode of manufacture, said steel having a 60 hertz core loss of about 4.5 watts per pounD at 15 kilogausses at a thickness of 0.025 inch.
Claim 8
Dependent Claim
85 words
A fully-processed grade steel of the carbon steel type for magnetic uses consisting essentially of about 0.010% maximum carbon, about 0.05% to about 1.0% manganese, about 0.01% maximum sulfur, up to 0.6% maximum silicon, about 0.008% maximum nitrogen, about 0.01% maximum oxygen, from about 0.05% to about 0.15% phosphorus, the balance being iron and those impurities incident to the mode of manufacture, said steel having a 60 hertz core loss of about 4.5 watts per pounD at 15 kilogausses at a thickness of 0.025 inch.
Claim 9
Dependent Claim
79 words
A fully-processed grade steel of the carbon steel type for magnetic uses consisting essentially of about 0.006% maximum carbon, about 0.45% manganese, 0.01% maximum sulfur, from about 0.10% to about 0.15% silicon, about 0.005% maximum nitrogen, about 0.005% maximum oxygen, about 0.10% phosphorus, the balance being iron and those impurities incident to the mode of manufacture, said steel having a 60 hertz core loss of about 4.5 watts per pound at 15 kilogausses at a thickness of 0.025 inch.
Claim 10
Dependent Claim
79 words
A fully-processed grade steel of the carbon steel type for magnetic uses consisting essentially of about 0.006% maximum carbon, about 0.45% manganese, 0.01% maximum sulfur, from about 0.10% to about 0.15% silicon, about 0.005% maximum nitrogen, about 0.005% maximum oxygen, about 0.10% phosphorus, the balance being iron and those impurities incident to the mode of manufacture, said steel having a 60 hertz core loss of about 4.5 watts per pound at 15 kilogausses at a thickness of 0.025 inch.
Claim 11
Dependent Claim
155 words
A PROCESS OF MAKING A FULLY-PROCESSED GRADE STEEL OF THE CARBON STEEL TYPE COMPRISING THE STEPS OF PROVIDING A CARBON STEEL MELT HAVING A CARBON CONTENT UP TO 0.1% MAXIMUM, REDUCING THE NITROGEN CONTENT OF SAID MELT TO 0.008% MAXIMUM AND REDUCING THE OXYGEN CONTENT OF SAID MELT TO 0.01% MAXIMUM, ADDING TO SAID MELT FROM ABOUT 0.05% TO ABOUT 1.0% MANGANESE AND FROM ABOUT 0.05% TO ABOUT 0.15% PHOSPHORUS AND UP TO 0.6% SILICON, CASTING SAID STEEL MELT, HOT ROLLING SAID STEEL TO HOT BAND, PICKING SAID STEEL, COLD ROLLING SAID STEEL TO COLD BAND, SUBJECTING SAID STEEL TO A HEAT TREATMENT AND REDUCING SAID CARBON CONTENT TO 0.010% MAXIMUM IN AT LEAST ONE OF SAID MELT, SAID HOT BAND AND SAID COLD BAND DURING SAID PROCESS THEREBY PROVIDING SAID FULLY-PROCESSED GRADE STEEL WITH A 60 HERTZ CORE LOSS OF ABOUT 4.5 WATTS PER POUND AT 15 KILOGAUSSES AT A THICKNESS OF 0.025 INCH.
Claim 12
Dependent Claim
155 words
A PROCESS OF MAKING A FULLY-PROCESSED GRADE STEEL OF THE CARBON STEEL TYPE COMPRISING THE STEPS OF PROVIDING A CARBON STEEL MELT HAVING A CARBON CONTENT UP TO 0.1% MAXIMUM, REDUCING THE NITROGEN CONTENT OF SAID MELT TO 0.008% MAXIMUM AND REDUCING THE OXYGEN CONTENT OF SAID MELT TO 0.01% MAXIMUM, ADDING TO SAID MELT FROM ABOUT 0.05% TO ABOUT 1.0% MANGANESE AND FROM ABOUT 0.05% TO ABOUT 0.15% PHOSPHORUS AND UP TO 0.6% SILICON, CASTING SAID STEEL MELT, HOT ROLLING SAID STEEL TO HOT BAND, PICKING SAID STEEL, COLD ROLLING SAID STEEL TO COLD BAND, SUBJECTING SAID STEEL TO A HEAT TREATMENT AND REDUCING SAID CARBON CONTENT TO 0.010% MAXIMUM IN AT LEAST ONE OF SAID MELT, SAID HOT BAND AND SAID COLD BAND DURING SAID PROCESS THEREBY PROVIDING SAID FULLY-PROCESSED GRADE STEEL WITH A 60 HERTZ CORE LOSS OF ABOUT 4.5 WATTS PER POUND AT 15 KILOGAUSSES AT A THICKNESS OF 0.025 INCH.
Claim 13
Dependent Claim
18 words
The process claimed in claim 7 wherein said reduction of said carbon content is accomplished in said melt.
Claim 14
Dependent Claim
31 words
The process claimed in claim 7 wherein said reduction in carbon content is accomplished by decarburizing said hot band after said pickling thereof, said heat treatment comprising a strip normalizing treatment.
Claim 15
Dependent Claim
43 words
The process claimed in claim 8 wherein said heat treatment comprises an anneal to develop the magnetic properties of said steel, said anneal being conducted at a temperature of from about 1400*F to about 2000*F for a period of about 3 1/2 minutes.
Claim 16
Dependent Claim
15 words
The process claimed in claim 8 wherein said heat treatment comprises a strip normalizing treatment.
Claim 17
Dependent Claim
27 words
The process claimed in claim 10 wherein said carbon content is reduced to 0.006% maximum and said nitrogen and oxygen contents are both reduced to 0.005% maximum.
Claim 18
Dependent Claim
17 words
The process claimed in claim 10 wherein said silicon addition is from about 0.10% to about 0.15%.
Claim 19
Dependent Claim
17 words
The process claimed in claim 12 wherein said silicon addition is from about 0.10% to about 0.15%.
Claim 20
Dependent Claim
20 words
The process claimed in claim 14 wherein said mangahese addition is about 0.45% and said phosphorus addition is about 0.10%.
Claim 21
Dependent Claim
105 words
A process of making a semi-processed grade steel of the carbon steel type comprising the steps of providing a melt having up to about 0.1% carbon, reducing the nitrogen content to about 0.008% maximum and reducing the oxygen content to about 0.02% maximum, adding to said melt from about 0.05% to about 1.0% manganese and up to 0.6% maximum silicon, hot rolling said steel to hot band, pickling said steel and cold rolling said steel to final gauge thereby providing said semi-processed grade steel with a 60 hertz core loss of about 4 watts per pound at 15 kilogausses at a thickness of 0.025 inch.
Claim 22
Dependent Claim
105 words
A process of making a semi-processed grade steel of the carbon steel type comprising the steps of providing a melt having up to about 0.1% carbon, reducing the nitrogen content to about 0.008% maximum and reducing the oxygen content to about 0.02% maximum, adding to said melt from about 0.05% to about 1.0% manganese and up to 0.6% maximum silicon, hot rolling said steel to hot band, pickling said steel and cold rolling said steel to final gauge thereby providing said semi-processed grade steel with a 60 hertz core loss of about 4 watts per pound at 15 kilogausses at a thickness of 0.025 inch.
Claim 23
Dependent Claim
18 words
The process claimed in claim 7 wherein said reduction in carbon content is accomplished in said cold band.
References Cited (Backward Citations)
DE1931420B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |