US3522108A - Method of forming electric insulating films on al - containing silicon steel sheet and surface-coated al-containing silicon steel sheet - Google Patents
Method of forming electric insulating films on al - containing silicon steel sheet and surface-coated al-containing silicon steel sheet Download PDFInfo
- Publication number
- US3522108A US3522108A US624068A US3522108DA US3522108A US 3522108 A US3522108 A US 3522108A US 624068 A US624068 A US 624068A US 3522108D A US3522108D A US 3522108DA US 3522108 A US3522108 A US 3522108A
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- United States
- Prior art keywords
- steel sheet
- mgo
- silicon steel
- film
- compound
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14775—Fe-Si based alloys in the form of sheets
- H01F1/14783—Fe-Si based alloys in the form of sheets with insulating coating
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C4/00—Compositions for glass with special properties
-
- 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
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
Definitions
- This invention relates to a method of forming a glassy film having a high electric insulation adhesion, space factor and heat resistance on the surface of a steel sheet in a process for producing an oriented silicon steel sheet containing Al as a constituent.
- An Al-containing oriented steel sheet (the term oriented shall included single oriented and double oriented hereinafter) is generally obtained by subjecting a hot-rolled plate or strip to a step including one or more cold-rollings and, if required, one or more annealings to obtain a steel sheet of final gauge, then subjecting the so-obtained sheet to a continuous short time annealing (simultaneously decarburizing when so required) and subsequently to a final-annealing (box annealing) at a high temperature of about 1200 C.
- the annealing separator that is, a film forming agent to be used in the box annealing is preferably a material which can immediately act as a separator during the final annealing and combines with the surface oxide layer to form a highly adhesive glassy film high in electric insulation, value, space factor and heat resistance, because the surface film for a material to be used for laminated sheets or wound cores for use in electric devices is required to have such high adhesion that the film will not peel off when subjected to a processing, high space factor and such high heat resistance that the characteristics of the film will not be deteriorated when subjected to high temperature stress-relieving annealing.
- Such material which can be used as an annealing separator and a film forming agent are known, for example MgO+SiO (U.S.P 2,354,123), Mg(OH) +Ca(OH) (U.S.P. 2,492,682) and oxides of alkaline earth metals (U.S.P. 2,533,351).
- Al is contained in a hot-rolled silicon steel sheet, even if the steel sheet is annealed in a decarburizing atmosphere for a short time, then is coated with the above mentioned conventional annealing separator in a decarburizing atmosphere, is dried and is final annealed by using dry H or a mixture gas of H and N as in the conventional practice, no highly adhesive glassy film high in electric insulation value will be obtained.
- the present invention is characterized by applying an inorganic oxide film forming agent consisting of a solution containing an Mg compound and an Mn compound mixed so that the weight ratio of MgO to MnO will be 98:2 to 20:80 in the coating slurry or in the film after being dried to an annealing separator in the final annealing in a process for producing oriented silicon steel sheet from a hot-rolled silicon steel plate or steel strip containing 0.01 to 0.09 wt. percent sol. Al so that a surface layer containing A1 0 produced during the short time annealing or the final annealing and said film forming agent will react with each other to form a glassy electric insulating film.
- an inorganic oxide film forming agent consisting of a solution containing an Mg compound and an Mn compound mixed so that the weight ratio of MgO to MnO will be 98:2 to 20:80 in the coating slurry or in the film after being dried to an annealing separator in the final annea
- the Mg compound or Mn compound so called here designates a compound which will become MgO or MnO when heated, such as its oxide, peroxide, hydroxide or carbonate.
- the fact that the A1 0 which is to react with the inorganic oxide film forming agent containing the Mg compound and Mn compound, is obtained specifically by the oxidization of Al contained in the silicon steel instead of being in the form of an added mixing agent is a feature of the present invention.
- a silicon steel sheet is merely coated on the surface a mixture of MgO, MnO and A1 0 and is annealed at a high temperature, no uniform smooth electric insulating film will be obtained.
- a surface layer containing A1 0 on the suiface of an oriented silicon steel sheet containing Al as one of constituents and the reaction of this surface layer with an inorganic oxide film forming agent containing an Mg compound and an Mn compound are carried out industrially in such an annealing step as short time annealing or box-annealing used in a process for produc ing silcon steel sheets.
- a silicon steel plate containing, for example, 0.010 to 0.090 wt. percent Al and 2.0 to 4.0 wt. percent Si is annealed for a short time after being cold-rolled so that a surface layer containing A1 will be produced on the surface, is coated on the surface with a suspension in which are mixed, for example, MaO, MnO and H 0 so that the coating of the annealing is present after the drying in an amount of from 2 to 10 g./m. or preferably 4 to 8 g./m.
- Such a glassy film is highly adhesive and has a high electric insu lation value and space factor and its chemical composition is of an Al O -SiO -FeO-MgO-MnO series when a Mn compound is to be used. Further, when the annealing separator remaining after the final annealing is analyzed, it can be seen that the content of the Mn compound has decreased and that of Mn in the steel has somewhat increased. It is thus presumed that the reaction therein has contributed to the formation of a highly adhesive glassy film and other precedingly enumerated properties.
- the Mg compound and Mn compound are, however, mixed so that the weight ratio of MgO:MnO in the separator after the drying is more than 98 of MgO and less than 2 of MnO, a highly adhesive and electric insulating film is not obtained. Further, even if the Mg compound and Mn compound are so mixed that the weight ratio of MgOzMnO in the separator after the drying is less than 20 of MgO and more than 80 of MnO, the obtained film after the annealing becomes so rough that the space factor is reduced and the adhesion is impaired.
- the mixing weight ratio of MgO to MnO effective for the production of a glassy film is in the range of 98:2 to 20:80.
- MgO manganese oxides and manganese hydroxides in such various forms as Mg(OH) Mn O MnO-OH and Mn(OH) can be used; also compounds which will become MgO and MnO when heated can be employed. It is considered that oxygen liberated from Mn0 by the thermodecomposition during the annealing or water produced by the reaction of this liberated 0 with the reducing atmosphere will be effective to form a glassy film. Thus, among the Mn compounds, MnO is a compound specifically desirable in practice.
- the Mn compound have a fine granularity such as more than 100 meshes per inch.
- Such a Mn compound has an act to refine compounds contained in the silicon steel such as S and A1 during the box-annealing and also has an advantage of not deteriorating the magnetic property of the silicon steel sheet.
- the steel sheet is coated first with the Mn compound as an under layer and then with the Mg compound thereon so as to form double layers, a favorable glassy film will be obtained.
- the ratio of the coated amounts of the under layer and the upper layer of the coating is so made that the ratio of MgOzMnO in the separator after drying will be in the above mentioned range the same as in the case of mixing them.
- the film forming and annealing separator may be applied by such general means as a roller or spray.
- the steel sheet should be dipped in an aqueous solution such as a nitrate or 4 sulfate of Mn for electrodeposition, then the oxide or hydroxide of Mn can be securely and uniformly deposited on the surface of the steel and therefore a better glassy film can be obtained.
- the above explained glassy film may be well utilized, as it is, for laminated core materials.
- the electric insulation and anticorrosion properties can be improved if the surface is further coated, for example, with an inorganic film made by applying, drying or baking a solution prepared by adding at least one part of Water glass, magnesium oxide, calcium oxide, zinc oxide and silicic anhydride to an aqueous solution containing 5 to 40 wt. percent phosphoric acid, 1 to 10 wt. percent of a compound containing hexavalent chromium as chromic anhydride or dichromic acid and less than 8 wt. percent of boric acid or borate, or with an inorganic film made by applying, drying or baking an aqueous solution prepared by adding 1 to 4 wt.
- a glassy insulaing film after a glassy insulaing film is formed by the present invention, it may be further coated with a film of one or more of such inorganic compounds as P, Cr and Si. Further, in case the steel sheet is to be used without any stress relieving annealing, the heat resistance of the film will not be required and therefore the glassy film can be coated thereon with an organic film or a mixed organic and inorganic film.
- the mixing ratio of such Zn, Cu or Cr compound to the Mg compound is, however, in the same range as that of MgOzMnO.
- EXAMPLE 1 In the production of a silicon steel sheet (with the range of about 2.0 to 4.0 wt. percent Si and about 0.010 to 0.040 wt. percent Al and for whose particulars U.S.P. 3,159,511 should be referred to) containing 0.017 wt. percent of total Al and 3 wt. percent Si, and which was subjected to a cold-rolling with a reduction rate of 65 to after being hot-rolled, the steel sheet was in order to be decarburized at 800 C.
- Adhesion when bent by 180 degrees with a diameter of 20 mm.
- the steel sheet was annealed for a short time of .5 minutes at 850 C. in an atmosphere of a decomposed ammonia gas having a dew point of 60 C. so as to make a surface layer containing A1 was thinly uniformly coated on the surface with a suspension consisting of 70 g. of MgO, 30 g.
- Adhesion when bent by 180 degrees with a diameter of 20 mm.
- the steel sheet was then coated with an aqueous solution consisting of 1.5 g. of ZnCr O 1.5 g. of H BO 1.5 g. of glycerine and cc. of H 0 in the recited mixing ratio so that the coated amount of the film after the baking was 2.5 g./m. and was baked so that an electric insulating film was produced.
- the results as compared with those of the case in which MgO only was used were as follows:
- Adhesion (when bent by degrees with a diameter of 20 mm.)
- Adhesion when bent by 180 degrees with a diameter of 20 mm.
- Example 5 Substantially no film. Th1; film did not peel Interlayer resistance (ASTM Process No. 2) in 90111. sheet (35 kgJcmJ) MgO only MgO+ZnO EXAMPLE '6
- the steel sheet in Example 5 was treated under the same conditions as in Example 5 by using a suspension consisting of 80 g. of MgO, 20 g. of CuO and 1 liter of H 0 instead of the MgO-ZnO series suspension.
- EXAMPLE 7 The steel sheet in Example 5 was treated under the same conditions as in Example 5 by using a suspension consisting of 80 g. of MgO, 20 g. of G0,, and 1 liter of H 0 instead of the MgO-ZnO series suspension.
- Example 6 4.12 Th1? film did not peel o
- Example 7 7. 27 Th5?f film did not peel EXAMPLE 8 H and was dried.
- the steel sheet was then final annealed at 1200 C. for hours by introducing a dry H gas (of a dew point of about C.) so that an electric insulating film was produced.
- This film was a uniform glassy film having a mirror-like luster and was higher in the luster, uniformity, adhesion and electric insulation than in the case where MgO and MnO were used as mixed.
- the results as compared with the case of MgO only were as follows:
- Intcrlayer resistance Adhesion (when (ASTM Process bent by 180 N0. 2) in ncmfi/ degrees with a sheet kg./cm. diameter of 20 mm.)
- EXAMPLE 9 When the steel sheet was painted with 1.5 g./m. of MnO by spraying instead of the electrodeposition of the Mn compound in Example 8 and was then treated the same as in Example 8, the same results as in Example 8 were obtained.
- a method of producing an electric insulating film on the surface of an Al-containing silicon steel sheet con taining soluble Al in an amount of 0.01 to 0.09% by weight comprising the steps of applying to the surface of the silicon steel sheet a compound selected from the group consisting of oxides, peroxides, hydroxides and carbonates and which produces MnO upon heating to form an under coating layer of said compound, applying an upper layer of MgO to said under coating layer in an amount so that the ratio of MgO to MnO is from 98:2 to 20:80, and annealing the thus coated steel sheet at a temperature of above 1000 C.
- a method of keeping Al-containing silicon steel sheets containing soluble Al in an amount of from 0.01 to 0.09% by weight'separate during final annealing while simultaneously producing an electric insulating film on the surface of the sheets comprising the steps of applying to the surface of the silicon steel sheets which have a surface layer of A1 0 thereon at least partly formed during a prior annealing a mixture of at least one Mg compound selected from the group consisting of oxides, peroxides, hydroxides and carbonates thereof and which produces MgO upon heating, and at least one further compound taken from the group consisting of Mn, Zn, Cu and Cr compounds which produce oxides of said further compounds when heated, the mixing ratio of the MgO to the oxide of the further compound being from a ratio of 98:2 to a ratio of 20:80, stacking the sheets, and further annealing the stacked sheets in a reducing atmosphere at a temperature of more than 1000 C. for causing the thus obtained mixture to react with the surface layer of the steel sheet so as to
- a method of producing an electric insulating film on the surface of an Al-containing silicon steel sheet containing soluble Al in an amount of from 0.01 to 0.09% by weight comprising the steps of applying to the surface of the silicon steel sheet which has a surface layer of A1 0 thereon at least partly formed during a prior annealing a mixture of at least one Mg compound selected from the group consisting of oxides, peroxides, hydroxides and carbonates thereof and which produces MgO' upon heating, and at least one further compound taken from the group consisting of Mn, Zn, Cu and Cr compounds which produce oxides of said further compounds when heated, the mixing ratio of the MgO to the oxide of the further compound being from a ratio of 98:2 to a ratio of 20:80, and causing the thus obtained mixture to react with the surface layer of the steel sheet in a reducing atmosphere of more than 1000 C. so as to form a glassy electric insulating film.
- Mg compound selected from the group consisting of oxides, peroxides, hydroxides
- step of applying the mixture comprises applying the Mn compound as an under layer on the surface of the Al-containing silicon steel sheet and then applying the Mg compound as an upper layer over the Mn compound.
- the mixture further includes at least one compound from the group consisting of a Zn compound, a Cu compound and a Cr compound, which are in the form of a compound taken from the group consisting of oxides, peroxides, hydroxides and carbonates of the respective elements and produce oxides of Zn, Cu and Cr upon heating.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electromagnetism (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Dispersion Chemistry (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Treatment Of Metals (AREA)
- Soft Magnetic Materials (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP41016902A JPS5112450B1 (ko) | 1966-03-18 | 1966-03-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3522108A true US3522108A (en) | 1970-07-28 |
Family
ID=11929057
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US624068A Expired - Lifetime US3522108A (en) | 1966-03-18 | 1967-03-17 | Method of forming electric insulating films on al - containing silicon steel sheet and surface-coated al-containing silicon steel sheet |
Country Status (7)
Country | Link |
---|---|
US (1) | US3522108A (ko) |
JP (1) | JPS5112450B1 (ko) |
BE (1) | BE695635A (ko) |
DE (1) | DE1621533B2 (ko) |
FR (1) | FR1536951A (ko) |
GB (1) | GB1183092A (ko) |
SE (1) | SE327322B (ko) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3632362A (en) * | 1969-06-27 | 1972-01-04 | Nippon Steel Corp | Insulation coating for electrical steel sheet and method of application |
US3719911A (en) * | 1969-10-24 | 1973-03-06 | Hitachi Ltd | Laminated magnetic coil materials |
US3765957A (en) * | 1969-12-18 | 1973-10-16 | Kawasaki Steel Co | Method of forming electric insulating coating on the surface of silicon steel sheet with serpentine |
US3833431A (en) * | 1971-12-09 | 1974-09-03 | Westinghouse Electric Corp | Process for continuously annealed silicon steel using tension-producing glass |
US3856568A (en) * | 1971-09-27 | 1974-12-24 | Nippon Steel Corp | Method for forming an insulating film on an oriented silicon steel sheet |
US4160681A (en) * | 1977-12-27 | 1979-07-10 | Allegheny Ludlum Industries, Inc. | Silicon steel and processing therefore |
US4298409A (en) * | 1979-12-10 | 1981-11-03 | Allied Chemical Corporation | Method for making iron-metalloid amorphous alloys for electromagnetic devices |
US4482401A (en) * | 1982-07-19 | 1984-11-13 | Allegheny Ludlum Steel Corporation | Method for producing cube-on-edge oriented silicon steel |
US4512823A (en) * | 1982-09-22 | 1985-04-23 | Calgon Corporation | Barium or chromium additives to magnesium oxide coating slurry |
CN100509180C (zh) * | 2007-05-16 | 2009-07-08 | 山东齐鲁电机制造有限公司 | 水溶性硅钢片漆的烤漆工艺 |
US20120073351A1 (en) * | 2008-04-22 | 2012-03-29 | Nippon Steel Corporation | Plated steel sheet and method of hot-stamping plated steel sheet |
CN108431243A (zh) * | 2015-12-18 | 2018-08-21 | Posco公司 | 定向电工钢板用退火分离剂、定向电工钢板及定向电工钢板的制造方法 |
US10593451B2 (en) * | 2013-03-29 | 2020-03-17 | Kobe Steel, Ltd. | Steel material having excellent corrosion resistance and excellent magnetic properties and production method therefor |
CN115725906A (zh) * | 2021-08-30 | 2023-03-03 | 宝山钢铁股份有限公司 | 一种用于高压直流继电器的镀覆锌铝镁的免磁化退火电磁纯铁钢板及其制造方法 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE854833A (fr) | 1976-05-24 | 1977-09-16 | Centro Sperimentale Metallurgico Spa | Separateur de recuit |
IT1156812B (it) * | 1978-06-09 | 1987-02-04 | Centro Speriment Metallurg | Perfezionamento nella fabbricazione di lamierino magnetico a grano orientato |
CA1194386A (en) * | 1982-07-19 | 1985-10-01 | Robert F. Miller | Method for producing cube-on-edge oriented silicon steel |
KR102390830B1 (ko) * | 2019-12-20 | 2022-04-25 | 주식회사 포스코 | 방향성 전기강판용 소둔 분리제 조성물, 방향성 전기강판 및 그의 제조방법 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3051589A (en) * | 1958-08-13 | 1962-08-28 | Pfaudler Permutit Inc | Corrosion resistant coated equipment and methods of making the same |
US3105781A (en) * | 1960-05-02 | 1963-10-01 | Gen Electric | Method for making cube-on-edge texture in high purity silicon-iron |
US3132056A (en) * | 1961-05-19 | 1964-05-05 | Gen Electric | Insulating coating for magnetic sheet material and method for producing the same |
US3151000A (en) * | 1959-08-28 | 1964-09-29 | Hooker Chemical Corp | Method of applying highly heat resistant protective coatings to metallic surfaces |
US3207636A (en) * | 1962-06-26 | 1965-09-21 | Yawata Iron & Steel Co | Method for coating silicon steel transformer sheets and composition |
US3259526A (en) * | 1962-04-24 | 1966-07-05 | Honeywell Inc | Method of heat treatment |
US3368712A (en) * | 1960-07-05 | 1968-02-13 | Ritter Pfaudler Corp | Semicrystalline glass and method of applying the same to metallic bases |
-
1966
- 1966-03-18 JP JP41016902A patent/JPS5112450B1/ja active Pending
-
1967
- 1967-03-14 GB GB01813/67A patent/GB1183092A/en not_active Expired
- 1967-03-17 US US624068A patent/US3522108A/en not_active Expired - Lifetime
- 1967-03-17 FR FR99313A patent/FR1536951A/fr not_active Expired
- 1967-03-17 BE BE695635D patent/BE695635A/xx not_active IP Right Cessation
- 1967-03-17 DE DE19671621533 patent/DE1621533B2/de not_active Withdrawn
- 1967-03-20 SE SE03819/67A patent/SE327322B/xx unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3051589A (en) * | 1958-08-13 | 1962-08-28 | Pfaudler Permutit Inc | Corrosion resistant coated equipment and methods of making the same |
US3151000A (en) * | 1959-08-28 | 1964-09-29 | Hooker Chemical Corp | Method of applying highly heat resistant protective coatings to metallic surfaces |
US3105781A (en) * | 1960-05-02 | 1963-10-01 | Gen Electric | Method for making cube-on-edge texture in high purity silicon-iron |
US3368712A (en) * | 1960-07-05 | 1968-02-13 | Ritter Pfaudler Corp | Semicrystalline glass and method of applying the same to metallic bases |
US3132056A (en) * | 1961-05-19 | 1964-05-05 | Gen Electric | Insulating coating for magnetic sheet material and method for producing the same |
US3259526A (en) * | 1962-04-24 | 1966-07-05 | Honeywell Inc | Method of heat treatment |
US3207636A (en) * | 1962-06-26 | 1965-09-21 | Yawata Iron & Steel Co | Method for coating silicon steel transformer sheets and composition |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3632362A (en) * | 1969-06-27 | 1972-01-04 | Nippon Steel Corp | Insulation coating for electrical steel sheet and method of application |
US3719911A (en) * | 1969-10-24 | 1973-03-06 | Hitachi Ltd | Laminated magnetic coil materials |
US3765957A (en) * | 1969-12-18 | 1973-10-16 | Kawasaki Steel Co | Method of forming electric insulating coating on the surface of silicon steel sheet with serpentine |
US3856568A (en) * | 1971-09-27 | 1974-12-24 | Nippon Steel Corp | Method for forming an insulating film on an oriented silicon steel sheet |
US3833431A (en) * | 1971-12-09 | 1974-09-03 | Westinghouse Electric Corp | Process for continuously annealed silicon steel using tension-producing glass |
US4160681A (en) * | 1977-12-27 | 1979-07-10 | Allegheny Ludlum Industries, Inc. | Silicon steel and processing therefore |
US4298409A (en) * | 1979-12-10 | 1981-11-03 | Allied Chemical Corporation | Method for making iron-metalloid amorphous alloys for electromagnetic devices |
US4482401A (en) * | 1982-07-19 | 1984-11-13 | Allegheny Ludlum Steel Corporation | Method for producing cube-on-edge oriented silicon steel |
US4512823A (en) * | 1982-09-22 | 1985-04-23 | Calgon Corporation | Barium or chromium additives to magnesium oxide coating slurry |
CN100509180C (zh) * | 2007-05-16 | 2009-07-08 | 山东齐鲁电机制造有限公司 | 水溶性硅钢片漆的烤漆工艺 |
US20120073351A1 (en) * | 2008-04-22 | 2012-03-29 | Nippon Steel Corporation | Plated steel sheet and method of hot-stamping plated steel sheet |
US9074277B2 (en) * | 2008-04-22 | 2015-07-07 | Nippon Steel & Sumitomo Metal Corporation | Plated steel sheet and method of hot-stamping plated steel sheet |
US10593451B2 (en) * | 2013-03-29 | 2020-03-17 | Kobe Steel, Ltd. | Steel material having excellent corrosion resistance and excellent magnetic properties and production method therefor |
CN108431243A (zh) * | 2015-12-18 | 2018-08-21 | Posco公司 | 定向电工钢板用退火分离剂、定向电工钢板及定向电工钢板的制造方法 |
EP3392356A4 (en) * | 2015-12-18 | 2018-12-05 | Posco | Annealing separator for oriented electrical steel sheet, oriented electrical steel sheet, and manufacturing method of oriented electrical steel sheet |
CN108431243B (zh) * | 2015-12-18 | 2020-06-19 | Posco公司 | 定向电工钢板用退火分离剂、定向电工钢板及定向电工钢板的制造方法 |
US11505843B2 (en) * | 2015-12-18 | 2022-11-22 | Posco | Annealing separator for oriented electrical steel sheet, oriented electrical steel sheet, and manufacturing method of oriented electrical steel sheet |
CN115725906A (zh) * | 2021-08-30 | 2023-03-03 | 宝山钢铁股份有限公司 | 一种用于高压直流继电器的镀覆锌铝镁的免磁化退火电磁纯铁钢板及其制造方法 |
CN115725906B (zh) * | 2021-08-30 | 2024-02-13 | 宝山钢铁股份有限公司 | 一种用于高压直流继电器的镀覆锌铝镁的免磁化退火电磁纯铁钢板及其制造方法 |
Also Published As
Publication number | Publication date |
---|---|
DE1621533A1 (ko) | 1971-11-18 |
GB1183092A (en) | 1970-03-04 |
JPS5112450B1 (ko) | 1976-04-20 |
SE327322B (ko) | 1970-08-17 |
DE1621533B2 (de) | 1971-11-18 |
FR1536951A (fr) | 1968-08-23 |
BE695635A (ko) | 1967-09-01 |
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