CS220760B2 - Method of making the electromagnetic silicon steel with high permeability - Google Patents

Abstract

A process for producing high permeability electromagnetic silicon steel having a cube-on-edge orientation. The process includes the steps of: preparing a melt of silicon steel containing from 2.5 to 4.0% silicon; casting; hot rolling; cold rolling; decarburizing; applying a refractory oxide base coating; and final texture annealing. The refractory oxide base coating is applied by electrolyzing an aqueous solution having as a major constituent at least one water soluble salt of calcium, magnesium, manganese or aluminium and as a minor constituent boron, with the steel being arranged as the cathode in the solution; by removing the thus coated steel from the solution; and by heating the coated steel at an elevated temperature.

Description

A silicon steel melt is prepared containing silicon, carbon, manganese, sulfur, optionally. selenium, Nini ^ ^p o ^{p at} pH Ada ^ears am ^{d of} d 'odtévá is hot rolled, then cold, decarburizing is applied to a refractory oxide coating and final texture annealing. ^For rovzdorný ^alkyl SLI ^No. n ^CART AC ^{p *} o and ^L is applied ^{to the} electrolysis of an aqueous solution containing AIN as ^h ^ stacks in a ^{ga p} oral extended salt of magnesium and boron as a further component and having a temperature of 48.9 to 90.3 ° C . The steel is treated as a cathode in solution. The coated steel is removed from the solution and heated to a temperature of 815 to 1370 ° C.

The invention relates. a process for producing electromagnetic steel with high permeability.

U.S. Pat. No. 3,054,732 discloses a method of electrolytically depositing a refractory base coating on magnetic silicon steel. According to this patent, an aqueous solution consisting essentially of at least one component selected from the group consisting of water-soluble salts of calcium, silicon, magane and aluminum is subjected to electrolysis with a silicon steel disposed as a cathode in solution. The coating is characterized by good adhesion and ^also izotačnrni vtaslrnostmi which ^{e p s} roar SUJ ^{corresponding} properties of coating suspension.

^To p ol ^y n and ^l in the cut is to improve the electrical ^ly tic, in U.S. Patent no. 3,054,732 so and ^would zlepšna -magnetická výstedné quality silicon steel -orientovanými grains. Adding boron to the electrolyte according VYN ^{AL yl} cut in a method ^{of manufacture} which increases the advantages of the electrolytic base coating, and further provides a highly permeable steel orien "tovanými grains. A conventional treatment after the application of a refractory oxide coating is described, for example, in U.S. Patent No. 3,855,020.

Numerous publications, including ^e town USA ^patents 3,676,227, no. 3,700,506 and no. 3,945,862 discloses a slurry coatings containing boron. Suspenzrn ^ky are coated or lined ^with A ^to completely ODL ^AI n ^e of electrolyte. The shape of the electrodeposited particles is different from the shape of the suspended particles. The reaction between the substrate and the coating is different. Suspended coatings are very friable prior to annealing, but not electrolytic. On the other hand, electrolytic coatings generate considerably more water during structural annealing.

^P ro ^t is the task ^y n and ^l ztepšený cut to create a method for producing oriented silicon steel having grains.

The invention relates to a process for producing electromagnetic silicon - high permeability steels having orientation cube-on-edge consists .mu.Ci of preparing a melt of silicon steel containing in weight ^to oncentraci ^2.5 to ^4.0% by ^{LR EMI, 0.02} 0.0% UHN ⁷ ^ ^{0, 0} 1-0 ^4% ^ anu n ^g, 0. ⁰⁰⁵ to ^0.09% of material from the ^y obsahuprn ^the UPIN and sulfur. piglet ^ ^0, 01 ^5-0, 0 ^5% aluminum ^{0, 0-0,} 0 ^2% choking ^ ^{0, 0-1,} 0% Copper ^ from ^the TE ^{to F Iron,} toerážto appreciate ^l odtév-vacuum heat , it is cold rolled, decarburized, a refractory oxide coating is applied and annealed to the final structure.

The invention consists in that the refractory ^alkyl with ^LiC n ^CART AC pov ^l and applied ^{to the} ele trolýzou aqueous -solution for the fraction of a second to several minutes, said aqueous solution has as the main component a soluble salt of magnesium and other like Or the component ^{b to h} motnostrn o.ncentraci ^0.001 to ^10% and TE ^pl OHI ^48.9 and ^93.3 ° C, ^Example i ^No EMZ steel being arranged as the cathode in this solution -k creating and storing lbor -containing adhesive cation hydroxide coating of the water-soluble salts on the steel, wherein the adhesive coating comprises - from 3 to 100 ppm of boron, based on the weight of the steel, whereupon the thus coated steel removed from the solution and heated to ¹⁵ to ¹³⁷⁰ 8 ° C. Elektrol ^y t is preferably made of magnesium borate.

^IR refractory ^alkyl sl n ^CART AC CREATE-coating ^when the steel at elevated ^longitude sweeps enou ^ tepte which usually occurs during the final texture anneal. As for common operations in steel processing, can be applied to any procedure napříMad ^p circumscribing the previously listed ených ^{d p} bombing. The term pouring ^also includes continuous casting. The heat treatment produced during hot rolling, is also included in Ramm VYN ^á climb. ^O ce ^{l characterized} Roben ^A through ^D Te ^y M ^a judgment ^generally permeabhito NEJM Step ^{E 7} 2.35 .10-3 hours. m " ¹ at 795 Am" i. Although it is possible for ^ ^ at that mesh ^k and ^{whether the} Remi ^and Steel s m ^s to be from ^p to ^p Rácová ^s e ^dl of inventions TAV nin ^{e y} containing postato hmotnostrn at a concentration of ^0.02 to ^0.07% UHN ^ ^0.01 to ^{0.24 p} rocenta n ^{g anus, from 0.005} to ^0.09%. of the ^substance Y ^to at ^P in ^Y contains sulfur and ^{0.015 to} piglet ^ ⁰ ^ 05% ЬИт ^{d 0.02} ° / o ^ ^d the width of ^1.0 ° / honey ^ 2 ^ and ^{from 4.0%} ^ Wem from ^{thee kd} to ¹⁰⁰ percent that ^{l Ezo,} the phenomenon ^and I ^to the largest of ^{d h} most f

The electrolyte is preferably extracted with a boron-containing calcium and / or magnesium compound. Boron ^l of c ^h emic ^alkyl vase and ^{t b} of fyzžútoě not added. A preferred compound is magnesium borate. The electrode contained -can by ^{T F} thienyl other látkiy example ^IKL ^ and ^d tohtottory růstei grains such as SBA ^IKL and ^d. Acid I ^for example to a napřr ^y Selina acetate ^{and added} VaJ ^{I to} the reaJkrn složtomh ^kt er ^s formed in a margin ^{mo ga} s salt. V ^ ^iPad E nan ^{ASI alk} AHC b ^{y Ké} coatings pH electrode should ^t nejmáž seventh Ele ^to troll ^yt is typically maintained. at least 50 ° C.

The main advantage of the invention is that by forming electrolytic refractory oxide coating which has a ^greater pnlnavost and holařní properties than ^yet known suspension coating. The coating according to the invention is characterized by improved reaction between the substrate steel and the coating solution during ^the one to žtoarn ^No. Nou structure. Most ^d ůležitější however, that the present process results obtained by ztepšuje magnetmž vtestnosb ^{n e} silicon grain oriented electrical steel on which it is applied. Thus, the invention represents a substantial advance in comparison with the prior art.

Nžledujbí CMD ^kl and ^{dy p} rove ^d ^ em větlujíi several aspects of the invention.

A heat of silicon steel was cast and a process ^and to -na ^armchair EM verifies ^Cart majfcí onentaci steel. ^k r ^y c ^h to the edge. ^S LO ^from measurement steel Uve eno ^d in Table I.

TABLE I

Composition (in weight concentration)

C Mn WITH AI N Cu (B) Si Fe 0,055 0.13 0,043 0,029 0.0055 0.19 0.0004 2.92 rest d ^by 100%

Steel include temperature compensation at an elevated temperature for several hodrn, ^Al COV ^ck behind te ^pl and nominal ttoušťku about 2 mm, normalize the hot rolled strip, cold rolled to final gauge, decarburizing, applying the refractory of oxide base coating, as described in the next paragraph, and annealing to the final structure.

^NONE rovzdorný základrn k ^ lmrnkový ^p s] varnish b ^y l forced in ^with EN eletorotyzou in a ^d RNM solution of ^p s ^No EMZ steel b ^yl and umfetona j and ^k of ^the ATO ^d and in solution, is then coated with the steel removed from the solution and heated at elevated temperature. Heating was performed during annealing to the final structure. The electrolyte was prepared by mixing 24.1 ml of acetic acid with 8.5 g of magnesium borate and 976 ml of water. Povlé.kání the ^p rov ^Adele op rou ^{p s d} uo density region ^{44 of} 0.0 A / cm ² at a temperature about 65 ° C. The coating had about 6 ppm boron based on the weight of the steel.

Eight samples. steel (sample A to H) was tested for permeability and core loss. Results The test ^with the EC ^{thanks to} the Uve ^d en ^y I tahutee ^first

TABLE II

Sample ^STK mm thick and Permeability ^{(μ 3} .10- Hm ^-1) Core loss (W.kg-l at 1.7 T) AND 0.2971 2,440 1,550 (B) 0.2921 2,439 1,523 C 0.2895 2,433 1,526 D 0.2870 2,383 1,704 E 0.2946 2,433 1,484 F 0.2895 2,433 1,477 G 0.2895 2,433 1,479 H 0.2870 2,415 1,543

The benefits of the boron content of the electrolyte are clearly shown in Table II. All eight pattern ^ing methodology permeabHito A higher ^width not ^from 2375. 10 ^{-3 H.} mp at ⁷⁹⁵ A. Sm and at ^ET Sma I in losses ^hole smaller ^width W. not ^{from 1.543 kg-1} at ^1.7 T. ^p řilnavost coating was excellent.

^Three samples ^d and ^LSI (sample I and ^Z K) of the same ^e melts were processed in a similar manner but with electrolytes .This which boron was not added. The magnetic properties of these samples are shown in Table III.

TABLE III

Sample Thickness Permeabnita (μ. 10 ~ ³ H. M-1) Core loss (W. Kg ” ¹ at 1.7 T) 1 AND 0.2921 2,357 1,799 J 0.2921 2,375 1,770 TO 0.2946 2,369 1,797

^D for a pattern emerging of nem ^{es el} permeabditu A higher ^width than 2 ^375th to “ ^{3 H.} m ¹ . Straight ^from in ^y with ^y in ^the ytujT with ^a l i losses ^hole pattern in Tocht ^Ku.

The magnetic properties of samples A to H are significantly better than samples I to K. Samples A to H are made according to the invention, while samples I to K are not.

Claims (2)

SUBJECT . VYNALEZU 1. A process for producing electromagnetic silicon steel having high permeability having orientation cube-on-edge, comprising preparing a melt of silicon steel containing in ^H motnostn ^as concentrations ^{of 2.5} to ^4.0% cream ^ík ^ ^0.02 and ^{about 0.07%} Uli ^ ^{0.01 '0.24 p} rocenta manganese from 0.005 to ^{0.09% lA sition} of SKUs in ^p o ^ ^y ^ Aliu sulfur and piglet ^ ^{0.015 and 0,} 05% ^{0, 0-0,} 02% nitrogens ^0, 0 ^{and 1.0%} I ^ and that ^the Tek ^{l Ezo,} and she oce ¹ of ^D1E VU ^A1 mend for warm-rolled cold decarburizing is applied to. ni refractory oxide coating and annealed final structure, characterized in that the refractory 'oxide coating deposited by electrolysis of an ^aqueous emulsion it spacing of ^the u ^p o ^d a ^b uo ^d fractions of seconds to several minutes, said aqueous solution has as the main component in water a soluble magnesium salt, and as a further component in a weight ^b or ¹ toncentram 0.00 ^and 10% and a temperature of 48.9 to 93.3 ° C, the steel is arranged as the cathode in the solution to form and deposit the boron-containing adherent coating hydroxide cations of the 'water-soluble salts on the steel, wherein the adhesive coating comprises 3 to 100 ppm of boron vzta ^Ž ENO to ^h Weigth oceů NACE ^F thus coated steel is removed from the solution and heated on a T ^P lot 8I ⁵ and ^from the ¹³⁷⁰ ° C. 2. Method of claim 1, wherein Elektrol ^yt consists of borate hořčftu.