CA1197757A - Method for coating silicon steel - Google Patents
Method for coating silicon steelInfo
- Publication number
- CA1197757A CA1197757A CA000393646A CA393646A CA1197757A CA 1197757 A CA1197757 A CA 1197757A CA 000393646 A CA000393646 A CA 000393646A CA 393646 A CA393646 A CA 393646A CA 1197757 A CA1197757 A CA 1197757A
- Authority
- CA
- Canada
- Prior art keywords
- steel
- coating
- sio2
- silicon steel
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1283—Application of a separating or insulating coating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
- C25D5/50—After-treatment of electroplated surfaces by heat-treatment
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/04—Electrolytic coating other than with metals with inorganic materials
- C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
- C25D9/10—Electrolytic coating other than with metals with inorganic materials by cathodic processes on iron or steel
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1272—Final recrystallisation annealing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Chemical Treatment Of Metals (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method for coating grain oriented silicon steel to improve its magnetic properties; the method includes applying to the surface of said steel a coating of Mg(OH)2 and SiO2 and thereafter final texture annealing said steel in the conventional manner with said coating thereon.
A method for coating grain oriented silicon steel to improve its magnetic properties; the method includes applying to the surface of said steel a coating of Mg(OH)2 and SiO2 and thereafter final texture annealing said steel in the conventional manner with said coating thereon.
Description
7t7~
A method for coating grain oriented silicon steel to improve its magne~ic properties; the method includes applying to the surface of said steel a coating of Mg(OH)2 and SiO2 and thereafter final texture annealing said steel ln ~he conven~ional manner with said coating thereon.
It is known to produce for electrical applications grain oriented silicon steel. More specifically, for this purpose the steel is melted, cast, hot rolled, subjected to one or more cold rollings, and intermediate normalizing treatment when two or more cold rollings are employed, decarburizing, application of a refractory oxide coating and final texture annealing to provide the desired grain orientation essential for achieving the required magnetic properties.
It is a primary objec~ of the presen~ invention to provide an improved electroly~ic coating practice for use with grain oriented silicon steels which results in improved magnetic properties.
This and other objects of the invention as well as a more complete undcrstanding thereof m2y be ob~ained from ~he following description and specific ex~ples.
The method of ~he invention provides an improvement in the conventional practice Gf producing grain oriented silicon steel wherein a melt of the steel is produced containing fro~
.02 to .06% carbon, up to .008% boron, up ~o .01% nitrogen, up to .05% aluminum and from 2.5 ~o 4% silicon, with the balance iron. In the conventional manner the ~elt is cast, hot rolled, cold rolled and decarburized. In accordance wi~h the invention a coating is applied to the surface of the steel comprising Mg(OH)2 and SiO2 and thereater the s~eel is final texture annealed wi~h the coating thereon. It has been fo~md that wi~h this coating a significan~ improvement is achieved with respec~ to the magnetic propcr~ies of the steel after ~exture annealing. With respec. to the coating it should preferably comprise in percen~ by weight, 87.5 to 97 Mg(OH)2 and 3 to 12.5 SiO2, or 88 to 96 Mg(OH)2 and 4 to 12 SiO2. It is preferred practice tha~ the coating be electrolytically applied by the use of a magnesl~m acetate electrolyte. The coating may also be applied by mixing the coating consti~uents with wa~er and applying as a slurry, but this practice is not preferred. Also the constltuents could be applied as individual layers, but this is likewise no~
preferred.
As a specific example o the practice of the invention a silicon steel of the following composition was used;
In Percent by Weight C B N _Al Si Fe .033 .0003 .0040 .003 3.17 Balance This steel was in the conventional m~nner hot rolled, and cold . rolled to a thickness of .0104 in. prior to conventional decarburization. The surfaces of various samples of the steel were coated both in the conventional pxactice and in accordance with the practice of the invention and the magne~ic properties, e.g. core loss and magnetic permeability at 10 oersteds, were determined as reported in Table I.
:3i,1"31.aa~5'7 % by Weight WPP ~ ~
Mg(OH)2 SiO2 17KB lOH
100 0 .733 1826 96.5 3.5 .723 1834 S 95.2 4.8 .714 1841 92.5 7.5 .693 1847 8~.1 11.9 .660 1~46 In this specific example all of the coa~ings were electroly~ically deposited using a magnesium acetate elec~rolyte. As may be seen from the magne~ic propcr~ies reported in Table I wh n comparing the. conventional coacings with the coatings in accordance wi~h the invention, the SiO2 addition generally improves core loss, particularly as the SiO2 content is increased above about 4~/O.
Table II indicates the improvement achieved in accordanc~ with the practice of the invention over conventional prac~ice from the standpoin~ of the relatively shorter ~ime required to deposit on thè steel surface a coating o similar weight.
TABLE II
~e~ Volts Sec. Temp. oz/ft2 Standard (7 liters M~g.Acetate) 8.0 6.5 33 146F .0294 Std. ~ 300 ml Ludox~ * 3.0 6.5 34 146F .0278 Std. ~ 600 ml Ludo ~ 8.0 6.S 30 146F .030 Std. ~ 900 ml Ludox~-~ 8.0 6.S 25 146~F .0272 * A 30% by weight colloidal suspension of SiO2 in water produced by duPont Chemical Co.
A method for coating grain oriented silicon steel to improve its magne~ic properties; the method includes applying to the surface of said steel a coating of Mg(OH)2 and SiO2 and thereafter final texture annealing said steel ln ~he conven~ional manner with said coating thereon.
It is known to produce for electrical applications grain oriented silicon steel. More specifically, for this purpose the steel is melted, cast, hot rolled, subjected to one or more cold rollings, and intermediate normalizing treatment when two or more cold rollings are employed, decarburizing, application of a refractory oxide coating and final texture annealing to provide the desired grain orientation essential for achieving the required magnetic properties.
It is a primary objec~ of the presen~ invention to provide an improved electroly~ic coating practice for use with grain oriented silicon steels which results in improved magnetic properties.
This and other objects of the invention as well as a more complete undcrstanding thereof m2y be ob~ained from ~he following description and specific ex~ples.
The method of ~he invention provides an improvement in the conventional practice Gf producing grain oriented silicon steel wherein a melt of the steel is produced containing fro~
.02 to .06% carbon, up to .008% boron, up ~o .01% nitrogen, up to .05% aluminum and from 2.5 ~o 4% silicon, with the balance iron. In the conventional manner the ~elt is cast, hot rolled, cold rolled and decarburized. In accordance wi~h the invention a coating is applied to the surface of the steel comprising Mg(OH)2 and SiO2 and thereater the s~eel is final texture annealed wi~h the coating thereon. It has been fo~md that wi~h this coating a significan~ improvement is achieved with respec~ to the magnetic propcr~ies of the steel after ~exture annealing. With respec. to the coating it should preferably comprise in percen~ by weight, 87.5 to 97 Mg(OH)2 and 3 to 12.5 SiO2, or 88 to 96 Mg(OH)2 and 4 to 12 SiO2. It is preferred practice tha~ the coating be electrolytically applied by the use of a magnesl~m acetate electrolyte. The coating may also be applied by mixing the coating consti~uents with wa~er and applying as a slurry, but this practice is not preferred. Also the constltuents could be applied as individual layers, but this is likewise no~
preferred.
As a specific example o the practice of the invention a silicon steel of the following composition was used;
In Percent by Weight C B N _Al Si Fe .033 .0003 .0040 .003 3.17 Balance This steel was in the conventional m~nner hot rolled, and cold . rolled to a thickness of .0104 in. prior to conventional decarburization. The surfaces of various samples of the steel were coated both in the conventional pxactice and in accordance with the practice of the invention and the magne~ic properties, e.g. core loss and magnetic permeability at 10 oersteds, were determined as reported in Table I.
:3i,1"31.aa~5'7 % by Weight WPP ~ ~
Mg(OH)2 SiO2 17KB lOH
100 0 .733 1826 96.5 3.5 .723 1834 S 95.2 4.8 .714 1841 92.5 7.5 .693 1847 8~.1 11.9 .660 1~46 In this specific example all of the coa~ings were electroly~ically deposited using a magnesium acetate elec~rolyte. As may be seen from the magne~ic propcr~ies reported in Table I wh n comparing the. conventional coacings with the coatings in accordance wi~h the invention, the SiO2 addition generally improves core loss, particularly as the SiO2 content is increased above about 4~/O.
Table II indicates the improvement achieved in accordanc~ with the practice of the invention over conventional prac~ice from the standpoin~ of the relatively shorter ~ime required to deposit on thè steel surface a coating o similar weight.
TABLE II
~e~ Volts Sec. Temp. oz/ft2 Standard (7 liters M~g.Acetate) 8.0 6.5 33 146F .0294 Std. ~ 300 ml Ludox~ * 3.0 6.5 34 146F .0278 Std. ~ 600 ml Ludo ~ 8.0 6.S 30 146F .030 Std. ~ 900 ml Ludox~-~ 8.0 6.S 25 146~F .0272 * A 30% by weight colloidal suspension of SiO2 in water produced by duPont Chemical Co.
Claims (5)
1. In a method for producing grain oriented silicon steel including the steps of preparing a melt of said silicon steel, casting said steel, hot rolling said steel, cold rolling said steel and decarburizing said steel, the improve-ment comprising applying a coating to the surface of said steel of Mg(OH)2 and SiO2 and final texture annealing said steel with said coating thereon.
2. The method of claim 1 wherein said coating comprises in percent by weight, 87.5 to 97 Mg(OH)2 and 3 to 12.5 SiO2.
3. The method of claim 1 wherein said coating comprises in percent by weight, 88 to 96 Mg(OH)2 and 4 to 12 SiO2.
4. The method of claim 1 wherein said coating is electrolytically deposited.
5. The method of claim 1 wherein said coating is electrolytically deposited using a magnesium acetate electrolyte.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US23234181A | 1981-02-06 | 1981-02-06 | |
| US232,341 | 1981-02-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1197757A true CA1197757A (en) | 1985-12-10 |
Family
ID=22872725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000393646A Expired CA1197757A (en) | 1981-02-06 | 1982-01-06 | Method for coating silicon steel |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0057983A3 (en) |
| JP (1) | JPS57145935A (en) |
| KR (1) | KR830009247A (en) |
| CA (1) | CA1197757A (en) |
| PL (1) | PL234964A1 (en) |
| RO (1) | RO84030B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69109794T2 (en) * | 1990-10-03 | 1996-02-08 | Nippon Steel Corp | Process for the production of Permalloy cores. |
| US5547519A (en) * | 1995-02-28 | 1996-08-20 | Armco Inc. | Magnesia coating and process for producing grain oriented electrical steel for punching quality |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2739085A (en) * | 1953-03-13 | 1956-03-20 | Westinghouse Electric Corp | Insulating coatings for magnetic sheets |
| DE1249049B (en) * | 1959-03-05 | |||
| FR1321837A (en) * | 1962-05-08 | 1963-03-22 | Thomson Houston Comp Francaise | Process for coating iron alloys |
-
1982
- 1982-01-06 CA CA000393646A patent/CA1197757A/en not_active Expired
- 1982-01-18 EP EP82300236A patent/EP0057983A3/en not_active Withdrawn
- 1982-01-19 KR KR1019820000200A patent/KR830009247A/en unknown
- 1982-01-26 RO RO106445A patent/RO84030B/en unknown
- 1982-02-01 JP JP1471282A patent/JPS57145935A/en active Pending
- 1982-02-05 PL PL23496482A patent/PL234964A1/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| RO84030A (en) | 1984-05-12 |
| KR830009247A (en) | 1983-12-19 |
| EP0057983A3 (en) | 1983-01-12 |
| JPS57145935A (en) | 1982-09-09 |
| PL234964A1 (en) | 1982-09-13 |
| EP0057983A2 (en) | 1982-08-18 |
| RO84030B (en) | 1984-06-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |