CA1198036A - Method for producing oriented silicon steel having improved magnetic properties - Google Patents
Method for producing oriented silicon steel having improved magnetic propertiesInfo
- Publication number
- CA1198036A CA1198036A CA000408676A CA408676A CA1198036A CA 1198036 A CA1198036 A CA 1198036A CA 000408676 A CA000408676 A CA 000408676A CA 408676 A CA408676 A CA 408676A CA 1198036 A CA1198036 A CA 1198036A
- Authority
- CA
- Canada
- Prior art keywords
- steel
- oriented silicon
- silicon steel
- core loss
- magnetic properties
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/02—Local etching
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Electromagnetism (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Soft Magnetic Materials (AREA)
Abstract
METHOD FOR PRODUCING ORIENTED SILICON STEEL HAVING
IMPROVED MAGNETIC PROPERTIES
Abstract of the Disclosure An improvement in the manufacture of oriented silicon steel to improve the magnetic properties, and specifically to achieve improved core loss; the improvement comprises removing at least 3.3µ? from each surface of said steel and normalizing said steel to effect decarburization prior to final texture annealing.
* * * * *
Oriented silicon steel in the form of sheets is known for use in various electrical applications, including the manufacture of transformer cores. The steel is produced by hot-rolling followed by cold rolling with or without intermediate annealing. Normalizing treatments are then conducted during which both decarburization and recrystallization are achieved. The steel is then conventionally coated and texture annealed. With oriented silicon steel after final texture annealing the alloy is characterized by a secondary recrystallization texture in the (110) [001] position, which is termed the cube-on-edge orientation. This alloy in sheet form has a single direction of easy magnetization in the direction of rolling. In applications for this material and specifically when used in the manufacture of transformer cores the material is desirable to have reduced core loss, because the consumption of electrical energy decreases as core loss decreases.
IMPROVED MAGNETIC PROPERTIES
Abstract of the Disclosure An improvement in the manufacture of oriented silicon steel to improve the magnetic properties, and specifically to achieve improved core loss; the improvement comprises removing at least 3.3µ? from each surface of said steel and normalizing said steel to effect decarburization prior to final texture annealing.
* * * * *
Oriented silicon steel in the form of sheets is known for use in various electrical applications, including the manufacture of transformer cores. The steel is produced by hot-rolling followed by cold rolling with or without intermediate annealing. Normalizing treatments are then conducted during which both decarburization and recrystallization are achieved. The steel is then conventionally coated and texture annealed. With oriented silicon steel after final texture annealing the alloy is characterized by a secondary recrystallization texture in the (110) [001] position, which is termed the cube-on-edge orientation. This alloy in sheet form has a single direction of easy magnetization in the direction of rolling. In applications for this material and specifically when used in the manufacture of transformer cores the material is desirable to have reduced core loss, because the consumption of electrical energy decreases as core loss decreases.
Description
~L 1006 IMPROVED MAGNETIC PROPERTIES
Abstract of the Disclosure An improvement in the manufacture of oriented silicon steel to improve the magnetic properties~ an specifically to achieve improved core 105s; the improvement comprises removing at least 3O3~t~ from each surface of said steel and normalizing said steel to effect decarburization prior to final texture annealing.
Oriented silicon steel in the form of sheets is known for use in various electrical applications, including the manufacture of transformer cores. The steel is produced by hot-rolling followed by cold-rolling with or without intermediate annealing. Normalizing treatments are then conducted during which both decarburization and recrystallization are achieved. The steel is then conventionally coated and texture annealed. With oriented silicon steel after final texture annealing the alloy is characterized by a secondary recrystallization texture in the (110) [001] position, which is termed the cube-on-edge orientation. This alloy in sheet form has a single direction of easy magnetization inlthe direction of rolling. In applications for this material and specifically when used in the manufacture of transformer cores the material is desirable to have reduced core loss, because the consumption of electrical energy decreases as core loss decreases.
3~
1 Reduced core loss may be promoted by achieving improved cube-on-edge orientation or grain structure, which in turn results in improved magnetic properties~ specifically improved core loss.
It is accordingly an object of the present invention to provide a method whereby oriented silicon steel may be provided with an improved orientation with regard to the secondary grain or crystal structure after texture annealing, whi.ch achieves reduced core loss~
This and other objects of the invention, as well as a more complete understanding thereof, may be obtained from the following description, specific examples and drawings, in which:
Figure 1 is a sc~ematic representation of specific examples of the practice of the invention;
Figure 2 is a curve showing the permeability achieved with respect to the specific examples set forth in Figure l; and Fiyure 3 is a curve showing the core loss determinations with respect to the specific examples of Figure 1.
In accordance with the invention it was determined better oriented secondary grains are produced in the interior of a strip as opposed to the surface portions thereof. In accordance with the practice of the invention it was determined that, and as will be shown by specific 1 examples hereinafter, if oriented silicon steel is subjected to an operation such as acid pickling to remove at least 3.3~ from each surface of the steel after cold-rolling and prior to normalizing and final texture annealing the surface portion thereof will be characterized by an improved secondary recrystallization or grain orientation which is the substantiaL equivalent of that typically occurring in the interior of the strip. This removal operation is performed by acid pickling and preEerably by the use of a hydrochloric acid solution.
By way of a specific example to demonstrate the invention samples of oriented silicon steels of the following compositions were employed:
Heat C Mn S Si Cu B Nz __ 494 030 034 020 3.12 .35 .0011 .0043 495 043 035 020 3.24 .34 .00~4 .00~9 Samples in the form of strips of the above compositions were processed to determine the effect of surface removal brought about by pickling on the final magnetic properties after texture annealing. The processing sequences for these samples are set forth in Figure l. As may be seen from this Figure 1 samples of the steel were subject to pickling beforet after and between final normalizing steps. In Figure l the symbols N, Q and P indicate the following treatrnents:
N = Norma:L final normalizing cycle, 1475F, 6 in./min.
in 80N2/20H2 at 50F d.~.
Q = Quick heat to 1800F for l min. in BON2/20H2 at 50F dopo 3~
1 P = Pickle in 50~ HCl, removing about 1/2 mil. from each side of strip.
Prior to texture annealing all the sample ctrips were coated with MgO + .75%B and thereafter final texture annealed in H2 at 2150F. The magnetic properties of the samples after final texture annealing with respect to permeability and core loss are set forth in Figures 2 and 3, respectively. The number after each data point in Figures 2 and 3 represents the calculaterd gauge of the strips, By way of comparison with conventionally processed material no~
subjected to pickling in accordance with the examples set forth in Figure l; the permeability and core loss data for conventionally processed materials are set forth in Table I. The material of Table I is of the same composition as that subjected to the testing as reported in Figure 1 and likewise was similarly coated after a similar normalizing treatment and prior to kexture annealing.
TABLE I
Heat # Final Norm. Cycle Coating 10H WPP 17KB
14S4~4 1475~F,/6l' min., Mag5 + .8~B 1890 .711 80N2/20H2 at 60F d.p.
148495 1475F,/5" min., MagS ~ .8~B 1897 ~681 80N2/20H2 at 60F d.p.
F'rom the magnetic properky data presented in Figures 2 and 3, when compared with the Table I data Eor conventionally processed material, it is evident that pickling in accordance with the invention prior to final normalizing results in an appreciable improvement in ~$q~ 3~
magnetic properties after texture annealing. More specifically, the treatment for the samples as set forth in Figure 1 designated at P + Q treatment yields the lowest core loss; whereas, the sample subjected to the N + P
treatment produces the highest core loss~ The N + P
treatment samples with respect to core loss approximate the core loss values achieved with conventional processing, absent a pickling treatment, as may be seen from the Table I
data.
We claim:
Abstract of the Disclosure An improvement in the manufacture of oriented silicon steel to improve the magnetic properties~ an specifically to achieve improved core 105s; the improvement comprises removing at least 3O3~t~ from each surface of said steel and normalizing said steel to effect decarburization prior to final texture annealing.
Oriented silicon steel in the form of sheets is known for use in various electrical applications, including the manufacture of transformer cores. The steel is produced by hot-rolling followed by cold-rolling with or without intermediate annealing. Normalizing treatments are then conducted during which both decarburization and recrystallization are achieved. The steel is then conventionally coated and texture annealed. With oriented silicon steel after final texture annealing the alloy is characterized by a secondary recrystallization texture in the (110) [001] position, which is termed the cube-on-edge orientation. This alloy in sheet form has a single direction of easy magnetization inlthe direction of rolling. In applications for this material and specifically when used in the manufacture of transformer cores the material is desirable to have reduced core loss, because the consumption of electrical energy decreases as core loss decreases.
3~
1 Reduced core loss may be promoted by achieving improved cube-on-edge orientation or grain structure, which in turn results in improved magnetic properties~ specifically improved core loss.
It is accordingly an object of the present invention to provide a method whereby oriented silicon steel may be provided with an improved orientation with regard to the secondary grain or crystal structure after texture annealing, whi.ch achieves reduced core loss~
This and other objects of the invention, as well as a more complete understanding thereof, may be obtained from the following description, specific examples and drawings, in which:
Figure 1 is a sc~ematic representation of specific examples of the practice of the invention;
Figure 2 is a curve showing the permeability achieved with respect to the specific examples set forth in Figure l; and Fiyure 3 is a curve showing the core loss determinations with respect to the specific examples of Figure 1.
In accordance with the invention it was determined better oriented secondary grains are produced in the interior of a strip as opposed to the surface portions thereof. In accordance with the practice of the invention it was determined that, and as will be shown by specific 1 examples hereinafter, if oriented silicon steel is subjected to an operation such as acid pickling to remove at least 3.3~ from each surface of the steel after cold-rolling and prior to normalizing and final texture annealing the surface portion thereof will be characterized by an improved secondary recrystallization or grain orientation which is the substantiaL equivalent of that typically occurring in the interior of the strip. This removal operation is performed by acid pickling and preEerably by the use of a hydrochloric acid solution.
By way of a specific example to demonstrate the invention samples of oriented silicon steels of the following compositions were employed:
Heat C Mn S Si Cu B Nz __ 494 030 034 020 3.12 .35 .0011 .0043 495 043 035 020 3.24 .34 .00~4 .00~9 Samples in the form of strips of the above compositions were processed to determine the effect of surface removal brought about by pickling on the final magnetic properties after texture annealing. The processing sequences for these samples are set forth in Figure l. As may be seen from this Figure 1 samples of the steel were subject to pickling beforet after and between final normalizing steps. In Figure l the symbols N, Q and P indicate the following treatrnents:
N = Norma:L final normalizing cycle, 1475F, 6 in./min.
in 80N2/20H2 at 50F d.~.
Q = Quick heat to 1800F for l min. in BON2/20H2 at 50F dopo 3~
1 P = Pickle in 50~ HCl, removing about 1/2 mil. from each side of strip.
Prior to texture annealing all the sample ctrips were coated with MgO + .75%B and thereafter final texture annealed in H2 at 2150F. The magnetic properties of the samples after final texture annealing with respect to permeability and core loss are set forth in Figures 2 and 3, respectively. The number after each data point in Figures 2 and 3 represents the calculaterd gauge of the strips, By way of comparison with conventionally processed material no~
subjected to pickling in accordance with the examples set forth in Figure l; the permeability and core loss data for conventionally processed materials are set forth in Table I. The material of Table I is of the same composition as that subjected to the testing as reported in Figure 1 and likewise was similarly coated after a similar normalizing treatment and prior to kexture annealing.
TABLE I
Heat # Final Norm. Cycle Coating 10H WPP 17KB
14S4~4 1475~F,/6l' min., Mag5 + .8~B 1890 .711 80N2/20H2 at 60F d.p.
148495 1475F,/5" min., MagS ~ .8~B 1897 ~681 80N2/20H2 at 60F d.p.
F'rom the magnetic properky data presented in Figures 2 and 3, when compared with the Table I data Eor conventionally processed material, it is evident that pickling in accordance with the invention prior to final normalizing results in an appreciable improvement in ~$q~ 3~
magnetic properties after texture annealing. More specifically, the treatment for the samples as set forth in Figure 1 designated at P + Q treatment yields the lowest core loss; whereas, the sample subjected to the N + P
treatment produces the highest core loss~ The N + P
treatment samples with respect to core loss approximate the core loss values achieved with conventional processing, absent a pickling treatment, as may be seen from the Table I
data.
We claim:
Claims (3)
1. In a method for producing oriented silicon steel characterized by improved core loss, including the steps of hot-rolling, cold-rolling with intermediate annealing, normalizing and final texture annealing, the improvement comprising removing at least 3.3µ? from each surface of said steel after cold-rolling and prior to normalizing said steel.
2. The method of claim 1 wherein at least 3.3µ?
is removed from each surface of said steel by acid pickling.
is removed from each surface of said steel by acid pickling.
3. The method of claim 2 wherein said pickling is performed by the use of an HC1 solution.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US29559181A | 1981-08-24 | 1981-08-24 | |
| US295,591 | 1981-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1198036A true CA1198036A (en) | 1985-12-17 |
Family
ID=23138371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000408676A Expired CA1198036A (en) | 1981-08-24 | 1982-08-04 | Method for producing oriented silicon steel having improved magnetic properties |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0074715B1 (en) |
| JP (1) | JPS5842728A (en) |
| KR (1) | KR840000668A (en) |
| BR (1) | BR8204770A (en) |
| CA (1) | CA1198036A (en) |
| DE (1) | DE3274260D1 (en) |
| PL (1) | PL238009A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4846939A (en) * | 1986-01-11 | 1989-07-11 | Nippon Steel Corporation | Method for producing a grain-oriented electrical steel sheet having an ultra low watt loss |
| US4897131A (en) * | 1985-12-06 | 1990-01-30 | Nippon Steel Corporation | Grain-oriented electrical steel sheet having improved glass film properties and low watt loss |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6193512A (en) * | 1984-10-15 | 1986-05-12 | 三菱電線工業株式会社 | Manufacture of shielded cable |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1191399B (en) * | 1959-01-23 | 1965-04-22 | Westinghouse Electric Corp | Process for the production of sheet metal from iron-silicon alloys with a cube texture |
| DE1111225B (en) * | 1959-03-18 | 1961-07-20 | Westinghouse Electric Corp | Process for the production of magnetizable sheets with a cube texture from iron-silicon alloys |
| US3090711A (en) * | 1959-07-06 | 1963-05-21 | Armco Steel Corp | Procedure for secondary recrystallization |
| US3105781A (en) * | 1960-05-02 | 1963-10-01 | Gen Electric | Method for making cube-on-edge texture in high purity silicon-iron |
| US3347718A (en) * | 1964-01-20 | 1967-10-17 | Armco Steel Corp | Method for improving the magnetic properties of ferrous sheets |
| JPS5224499B2 (en) * | 1973-01-22 | 1977-07-01 | ||
| US4054471A (en) * | 1976-06-17 | 1977-10-18 | Allegheny Ludlum Industries, Inc. | Processing for cube-on-edge oriented silicon steel |
| US4213804A (en) * | 1979-03-19 | 1980-07-22 | Allegheny Ludlum Industries, Inc. | Processing for cube-on-edge oriented silicon steel |
-
1982
- 1982-07-23 KR KR1019820003290A patent/KR840000668A/en unknown
- 1982-08-04 CA CA000408676A patent/CA1198036A/en not_active Expired
- 1982-08-09 EP EP82304192A patent/EP0074715B1/en not_active Expired
- 1982-08-09 DE DE8282304192T patent/DE3274260D1/en not_active Expired
- 1982-08-16 BR BR8204770A patent/BR8204770A/en unknown
- 1982-08-23 PL PL23800982A patent/PL238009A1/en unknown
- 1982-08-24 JP JP57146769A patent/JPS5842728A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4897131A (en) * | 1985-12-06 | 1990-01-30 | Nippon Steel Corporation | Grain-oriented electrical steel sheet having improved glass film properties and low watt loss |
| US4846939A (en) * | 1986-01-11 | 1989-07-11 | Nippon Steel Corporation | Method for producing a grain-oriented electrical steel sheet having an ultra low watt loss |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5842728A (en) | 1983-03-12 |
| KR840000668A (en) | 1984-02-25 |
| BR8204770A (en) | 1983-08-02 |
| PL238009A1 (en) | 1983-02-28 |
| EP0074715B1 (en) | 1986-11-12 |
| EP0074715A1 (en) | 1983-03-23 |
| DE3274260D1 (en) | 1987-01-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |