CN102453837B - Method for preparing non-oriented silicon steel with high magnetic induction - Google Patents

Method for preparing non-oriented silicon steel with high magnetic induction Download PDF

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CN102453837B
CN102453837B CN2010105178727A CN201010517872A CN102453837B CN 102453837 B CN102453837 B CN 102453837B CN 2010105178727 A CN2010105178727 A CN 2010105178727A CN 201010517872 A CN201010517872 A CN 201010517872A CN 102453837 B CN102453837 B CN 102453837B
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silicon steel
temperature
normalizing
cold rolling
hot
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CN102453837A (en
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王子涛
王波
谢世殊
金冰忠
马爱华
邹亮
朱雨华
胡瞻源
陈晓
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Baoshan Iron and Steel Co Ltd
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Priority to KR1020127015086A priority patent/KR101404101B1/en
Priority to EP11835489.3A priority patent/EP2508629A4/en
Priority to JP2012542352A priority patent/JP2013513724A/en
Priority to RU2012124187/02A priority patent/RU2527827C2/en
Priority to PCT/CN2011/072775 priority patent/WO2012055215A1/en
Priority to MX2012006680A priority patent/MX2012006680A/en
Publication of CN102453837A publication Critical patent/CN102453837A/en
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    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • H01F1/16—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 in the form of sheets

Abstract

The invention provides a method for preparing a non-oriented silicon steel with high magnetic induction, which comprises the following steps: 1) smelting and casting, wherein the non-oriented silicon steel comprises the following chemical components by weight percentage: 0.1-1% of Si, 0.005-1% of Al, less than or equal to 0.004% of C, 0.10-1.50% of Mn, less than or equal to 0.2% of P, less than or equal to 0.005% of S, less than or equal to 0.002% of N, less than or equal to 0.006% of Nb+V+Ti and the balance of Fe, steel-making, secondary refining and casting to casting blank; 2) hot rolling, wherein the heating temperature is 1150 DEG C-1200 DEG C, the finishing temperature is 830-900 DEG C, reeling at the temperature of greater than or equal to 570 DEG C; 3) flattening, cold rolling with reduction ratio of 2-5%; 4) normalizing, wherein the temperature is not less than 950 DEG C, insulating for 30-180s; 5) pickling and cold rolling, wherein the cold rolling with accumulated reduction ratio of 70-80% is carried out after pickling; 6) annealing, heating to the temperature of 800-1000 DEG C with speed of greater than or equal to 100 DEG C, insulating for 5s-60s, slow cooling to the temperature of 600-750 DEG C with speed of 3-15 DEG C/s. Under the prerequisite that the iron loss is ensured, at least 200 gauss of the non-oriented silicon steel magnetic induction can be increased.

Description

A kind of manufacture method of high-magnetic strength non-oriented silicon steel
Technical field
The present invention relates to the manufacture method of non orientating silicon steel, particularly a kind of manufacture method of high-magnetic strength non-oriented silicon steel.
Background technology
Non orientating silicon steel is a kind of important magneticsubstance, is widely used in fields such as various motors, compressor.Generally speaking, its silicone content is less than 6.5%, and aluminium content is lower than 3%, C% and is lower than 0.1%, contains less impurity element simultaneously.Implement hot rolling, normalizing and cold rolling process again, and carry out final annealing and be coated with insulating layer coating.
For non orientating silicon steel, performance index mainly comprise material iron loss, magnetic strength and magneticanisotropy etc.The non orientating silicon steel magnetic property is subjected to influence of various factors such as material composition, thickness, thermal treatment process.
In order to obtain the magnetic induction non-oriented silicon steel of superelevation, adopt lower silicone content usually, reduce resistivity of material, simultaneously, adopt high hot-rolled sheet normalizing temperature, normalizing temperature even up to 1000 ℃.But because silicon, aluminium content are lower, non orientating silicon steel normalizing plate recrystallized structure is comparatively tiny.Tiny normalized structure makes that { 0kl} plane texture intensity is low, and corresponding magnetic strength is lower in the final annealing plate.
Simultaneously, annealing process is the key factor that influences the material magnetic strength equally.Usually adopt suitable soaking temperature and soaking time to obtain the suitable annealed sheet of grain size.If the soaking temperature height, soaking time is long, and annealed sheet crystal grain is thick, in the material { the 111} plane texture can strengthen, and causes magnetic strength to reduce; If but crystal grain diameter is less than normal, then the magnetic hysteresis loss of material is bigger than normal, the loss of electric machine when having increased final the use.
Compare with heating at a slow speed, when adopting flash annealing, have very strong goss texture in the production board.On the other hand, at a slow speed in the heating anneal production board main texture component be 111}＜112 〉, and 110}＜114 〉, 001}＜120〉and 111}＜110〉component is very weak.(document: Jong-Tae PARK, Jerzy A.SZPUNAR Sang-Yun CHA Effect of Heating Rateon the Development of Annealing Texture in Nonoriented Electrical SteelsISIJ International, Vol.43 (2003), No.10, pp.1611-1614).Therefore, adopt the annealing way of rapid heating, can suppress Recovery Process, { 110} is with { 100} plane texture core effectively improves the material magnetic strength in acquisition simultaneously.
Summary of the invention
The manufacture method that the purpose of this invention is to provide a kind of high-magnetic strength non-oriented silicon steel is guaranteeing under the prerequisite of iron loss, utilizes hot-rolled sheet gently to depress measure and the cold-reduced sheet flash annealing is produced high-magnetic strength non-oriented electrical steel.
For achieving the above object, technical scheme of the present invention is:
A kind of manufacture method of high-magnetic strength non-oriented silicon steel, it comprises the steps:
1) smelts, casts
Non orientating silicon steel chemical component weight per-cent: Si:0.1～1%, Al:0.005～1%, C≤0.004%, Mn:0.10～1.50%, P≤0.2%, S≤0.005%, N≤0.002%, Nb+V+Ti≤0.006%; All the other are iron and unavoidable impurities; Converter or Electric furnace steel making, molten steel is handled through secondary refining, is cast into strand;
2) hot rolling
1150 ℃～1200 ℃ of slab heating temperature are carried out hot rolling after the soaking insulation, and 830～900 ℃ of hot rolling finishing temperatures batch under 〉=570 ℃ of temperature condition;
3) smooth, to hot-rolled sheet carry out draught be 2～5% cold rolling;
4) normalizing is carried out one-time continuous annealing normalizing to the hot-rolled sheet after cold rolling and is handled, and the normalizing temperature is not less than 950 ℃, soaking time 30～180s;
5) pickling, cold rolling
The normalizing plate is carried out pickling, carry out multi-pass accumulative total draught afterwards and be 70～80% cold rolling, be rolled into the cold-reduced sheet of target thickness
6) annealing is carried out flash annealing to the cold-reduced sheet after cold rolling, and temperature rise rate 〉=100 ℃/s are warmed up to 800～1000 ℃ of insulations, and soaking time 5～60s slowly cools to 600～750 ℃ with 3～15 ℃/s speed of cooling then;
Further, annealing atmosphere is (volume ratio 30%～70%) H 2+ (volume ratio 70%～30%) N 2, dew point≤-25 ℃.
Influence the non orientating silicon steel magnetic induction density B 25And B 50Principal element be chemical ingredients and crystallographic texture.Silicon, aluminium or manganese amount improve, and resistivity of material improves, B 25And B 50Reduce.Desirable crystallographic texture is (100) [uvw] plane texture, is not rolling on the face because it is isotropy and hard direction [111].In fact can not obtain this single plane texture.Generally have (100) [011], (111) [112], (110) [001], (112) texture components such as [011], wherein (100) component texture only accounts for 20%, and belonging to does not substantially have orientation chaotic texture, just magnetic isotropy.Therefore, adjust composition and improve manufacturing process make (100) component strengthen and (111) component to weaken be to improve magnetic induction density B 25And B 50The important channel.
What time following the main consideration of composition design of the present invention is:
Si: can be dissolved in and form substitutional solid solution in the ferrite, improve matrix resistivity, reduce iron loss, be the most important alloying element of electrical steel, but Si worsens magnetic strength, and the present invention is conceived to the magnetic induction non-oriented silicon steel of a kind of superelevation, so Si content is lower, is 0.1～1%.
Al: also be that resistivity improves element, dissolve in ferrite and improve matrix resistivity that coarsened grain reduces iron loss, but magnetic strength is reduced.Al content surpasses 1.5% will make smelting cast difficulty, and magnetic strength reduces, and processing difficulties.
Mn: the same resistivity that can increase steel with Si, Al, magnetic strength is reduced, but Mn can reduce iron loss, can form stable MnS with inevitable inclusion S, eliminate the harm of the magnetic of S.Therefore be necessary to add the content more than 0.1%.Mn of the present invention is 0.10%～1.50%.
Below the P:0.2%, in steel, add the processibility that certain phosphorus can improve steel plate.
C, N, Nb, V, Ti: be the unfavorable element of magnetic, require C≤0.004% among the present invention, S≤0.005%, N≤0.002%, Nb+V+Ti≤0.006% reduces the deterioration to magnetic property as far as possible.
Slab heating temperature should be lower than the solid solubility temperature of steel grade inclusion MnS, AlN.Heating temperature is set at 1150 ℃～1200 ℃ among the present invention, 830～900 ℃ of hot rolling finishing temperatures, and coiling temperature 〉=570 ℃ can guarantee not solid solution and obtain thick hot-rolled sheet crystal grain of inclusion.
An amount of smooth for obtaining a key factor of the magnetic induction non-oriented silicon steel of superelevation among the present invention to hot-rolled sheet.The present invention is conceived to a kind of non orientating silicon steel manufacture method of superelevation magnetic strength, and therefore, in the chemical ingredients, silicon, aluminium content are lower.Cause in the hot-rolled sheet normalizing process crystal grain normally to grow up and lack grain growth elements such as silicon, aluminium.Simultaneously, recrystallize takes place in low silicon non-oriented silicon steel easily in course of hot rolling, and therefore, recrystal grain such as axle such as grade tiny in its hot-rolled sheet tissue is more, and rolled fiber is organized seldom.Before normalizing to hot-rolled sheet apply draft be 2～5% smooth, can increase material internal deformation energy storage, thereby make normalizing plate recrystallized structure more thick.And when smooth draft is excessive, then can too much to influence normalizing lath grain length big because of the hot-rolled sheet subsurface defect.
The main purpose of hot-rolled sheet normalizing and preannealing is to improve grain structure and the texture of finished product.Result to low silicon non-oriented electrical steel research shows, thickization of cold rolling preceding grain structure will make cold-reduced sheet, and { the 111} texture component weakens behind final annealing, { the 0kl} texture component enhancing favourable to magnetic, precipitate alligatoring simultaneously makes that crystal grain is easier grows up, thereby magnetic strength and iron loss are improved.Among the present invention, high-magnetic strength non-oriented silicon steel normalizing temperature is not less than 950 ℃, soaking time 30～180s.
To magnetic property favourable 110} goss texture crystal grain is forming core and growing up in cold rolling side cut band usually, and if temperature rise rate is slower, when temperature is low, Recovery Process can take place in the material, thereby the lattice distortion in the reduction material, like this, the probability of goss texture forming core has just greatly reduced.Adopt flash annealing, can pass the temperature range of unfavorable texture evolution fast, { the 0kl} plane texture has better development to make favorable texture.Thereby the iron loss of making, magnetic strength are all optimized to some extent.Slowly cooling can reduce the annealed sheet internal stress, improves magnetic property.Among the present invention cold-reduced sheet is taked flash annealing, annealing temperature rise rate 〉=100 ℃/s are warmed up to 800～1000 ℃ of insulations, and soaking time 5～60s slowly cools to 600～750 ℃ with 3～15 ℃/s speed of cooling then.
The invention has the advantages that:
Compare with the non orientating silicon steel manufacture method of routine, under the prerequisite that guarantees iron loss, the present invention can improve minimum 200 Gausses of non orientating silicon steel magnetic strength.
Description of drawings
Fig. 1 is the smooth draught of hot-rolled sheet and final annealing plate magnetic property relation.
Embodiment
The present invention will be further described below in conjunction with embodiment and accompanying drawing.
Embodiment 1
(1) non orientating silicon steel hot-rolled sheet, thickness 2.6mm, composition is: Si 0.799%, and Al 0.4282%, and C 0.0016%, and Mn 0.26%, P≤0.022%, S≤0.0033%, N≤0.0007%, Nb 0.0004%, and V 0.0016%, and Ti 0.0009%; All the other are iron and unavoidable impurities.
(2) hot-rolled sheet is carried out cold rolling, draft 1～10%.
(3) carry out normalizing and handle, 970 ℃ of normalizing soaking temperatures, insulation 60s.To the pickling of normalizing plate, be cold rolled to 0.5mm thickness then afterwards.
(4) utilize the energising heating anneal stove in laboratory to carry out flash annealing.250 ℃/s of temperature rise rate, 850 ℃ of soaking temperatures, insulation 13s.
After hot-rolled sheet was gently depressed through 1～10%, it is big that normalizing plate recrystallized structure obviously becomes, but production board microstructure difference is little.Draught is 4～6% o'clock, production board magnetic property optimum, and magnetic strength B50 reaches 1.83T.Performance is as shown in table 1, and the smooth draught of hot-rolled sheet and final annealing plate magnetic property relation are as shown in Figure 1.
Table 1, non orientating silicon steel final annealing plate magnetic property
Figure BDA0000029359920000051
Detected normalizing plate and final annealing plate microstructure after the different drafts of process are smooth, found that after hot-rolled sheet was slight cold rolling, its normalizing lath grain was obviously grown up, final annealing lath grain size variation is not obvious.Normalizing plate, annealed sheet average crystal grain diameter are as shown in table 2.This result and production board magnetic property have good correspondence, and along with normalizing lath grain becomes big, { the 111} texture component weakens cold-reduced sheet, { 110} texture component enhancing, the final annealing plate magnetic strength B50 optimization favourable to magnetic behind final annealing.
Table 2, non orientating silicon steel normalizing plate, annealed sheet average crystal grain diameter
Figure BDA0000029359920000052
Embodiment 2
(1) non orientating silicon steel hot-rolled sheet, thickness 2.6mm, composition is: Si 1%, and Al 0.2989%, and C 0.0015%, and Mn 0.297%, and P 0.0572%, and S 0.0027%, and N 0.0009%, and Nb 0.0005%, and V 0.0015%, and Ti 0.0011%; All the other are iron and unavoidable impurities.
(2) hot-rolled sheet is carried out cold rolling, draft 4%.
(3) carry out normalizing and handle, 950 ℃ of normalizing soaking temperatures, insulation 60s.To the pickling of normalizing plate, be cold rolled to 0.5mm thickness then afterwards.
(4) utilize the energising heating anneal stove in laboratory to carry out different temperature rise rate flash annealings.20 ℃/s of temperature rise rate, 150 ℃/s, 250 ℃/s, 960 ℃ of soaking temperatures, insulation 13s.
Final annealing plate performance is as shown in table 3.
Table 3, non orientating silicon steel final annealing plate magnetic property
Figure BDA0000029359920000061
As can be seen from Table 3, the annealing temperature rise rate is to the influence of annealed sheet iron loss and magnetic strength.Along with the annealing temperature rise rate improves, iron loss reduces, and magnetic strength raises.

Claims (2)

1. the manufacture method of a high-magnetic strength non-oriented silicon steel, it comprises the steps:
1) smelts, casts
Non orientating silicon steel chemical component weight per-cent: Si:0.1～1%, Al:0.005～1%, C≤0.004%, Mn:0.10～1.50%, P≤0.2%, S≤0.005%, N≤0.002%, Nb+V+Ti≤0.006%; All the other are iron and unavoidable impurities; Converter or Electric furnace steel making, molten steel is handled through secondary refining, is cast into strand;
2) hot rolling
1150 ℃～1200 ℃ of slab heating temperature are carried out hot rolling after the soaking insulation, and 830～900 ℃ of hot rolling finishing temperatures batch under 〉=570 ℃ of temperature condition;
3) smooth, to hot-rolled sheet carry out draught be 2～5% cold rolling;
4) normalizing is carried out one-time continuous annealing normalizing to the hot-rolled sheet after cold rolling and is handled, and the normalizing temperature is not less than 950 ℃, soaking time 30～180s;
5) pickling, cold rolling
The normalizing plate is carried out pickling, carry out multi-pass accumulative total draught afterwards and be 70～80% cold rolling, be rolled into the cold-reduced sheet of target thickness;
6) annealing is carried out flash annealing to the cold-reduced sheet after cold rolling, and temperature rise rate 〉=100 ℃/s are warmed up to 800～1000 ℃ of insulations, and soaking time 5～60s slowly cools to 600～750 ℃ with 3～15 ℃/s speed of cooling then.
2. the manufacture method of high-magnetic strength non-oriented silicon steel as claimed in claim 1 is characterized in that, annealing atmosphere is: volume ratio 30%～70%H 2+ volume ratio 70%～30%N 2, dew point≤-25 ℃.
CN2010105178727A 2010-10-25 2010-10-25 Method for preparing non-oriented silicon steel with high magnetic induction Active CN102453837B (en)

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Application Number Priority Date Filing Date Title
CN2010105178727A CN102453837B (en) 2010-10-25 2010-10-25 Method for preparing non-oriented silicon steel with high magnetic induction
EP11835489.3A EP2508629A4 (en) 2010-10-25 2011-04-14 Method for manufacturing non-oriented silicon steel with high-magnetic induction
JP2012542352A JP2013513724A (en) 2010-10-25 2011-04-14 Manufacturing process of high magnetic induction non-oriented silicon steel
RU2012124187/02A RU2527827C2 (en) 2010-10-25 2011-04-14 Production of random-orientation electric steel with high magnetic induction
KR1020127015086A KR101404101B1 (en) 2010-10-25 2011-04-14 Method for manufacturing non-oriented silicon steel with high-magnetic induction
PCT/CN2011/072775 WO2012055215A1 (en) 2010-10-25 2011-04-14 Method for manufacturing non-oriented silicon steel with high-magnetic induction
MX2012006680A MX2012006680A (en) 2010-10-25 2011-04-14 Method for manufacturing non-oriented silicon steel with high-magnetic induction.
US13/492,984 US20120285584A1 (en) 2010-10-25 2012-06-11 Manufacture Process Of Non-Oriented Silicon Steel With High Magnetic Induction

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