CN1225396A - Non-oriented electrical steel sheet having good punchability and process for producing same - Google Patents
Non-oriented electrical steel sheet having good punchability and process for producing same Download PDFInfo
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- CN1225396A CN1225396A CN98125400A CN98125400A CN1225396A CN 1225396 A CN1225396 A CN 1225396A CN 98125400 A CN98125400 A CN 98125400A CN 98125400 A CN98125400 A CN 98125400A CN 1225396 A CN1225396 A CN 1225396A
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- 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
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- 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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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Abstract
A steel sheet with upstanding punchability and various characteristics equal to those of semiorganic film which allows the outermost surface layer or the steel surface to have a specified amt. of crystalline zinc phosphate film. The amt. of the crystalline zinc phosphate film is regulated to 0.2 to 5 g/m<2> . As for the base, it is possible that Zn or Ni plating is not present, but, in the case of their presence, they form the nuclei at the time of chemical conversion formation to shorten the treating time, where the contents of Zn and Ni in the final product are laminated to <=5 g/m<2> . A method to produce the steel sheet include forming an amt. of the crystalline zinc phosphate film which is regulated to 0.2 to 5 g/m<2> . It is preferable that the method also includes forming a zinc or nickel film in the surface of the steel sheet before forming said crystalline zinc phosphate film.
Description
The present invention relates to have the non-oriented electrical steel thin plate and the production method thereof of insulating blanket, described steel plate is generally used for making the rotating machine iron core of General Electric's equipment and the iron core of miniature transformer.
Except the fundamental property of electrical isolation, also require the coating of non-oriented electrical steel thin plate to have the following various performance relevant: bond resistance, the adhesivity after the stress relief annealing and the erosion resistance etc. of the bondability between steel plate for example and during the die wear (punching out) during the adhesivity of steel sheet, space factor, erosion resistance, the property sheared (slittability), punching press, the slip between steel plate, expression stress relief annealing with punching press and stress relief annealing.
Though carried out years of researches, can't obtain to satisfy the coating of all above-mentioned performance requriementss.For example, resin-based coating has fabulous punching out performance, but can be burnt during stress relief annealing, on the other hand, though inorganic coating can not burnt, can make its punching out poor performance because of its wearing and tearing essence.Therefore, unexpectedly, have only few coating commercially availablely to obtain.Nearly all at present at available this type coating of Japan, be disclosed those coatings in the public clear 50-15013 of spy, these coatings are passed through to apply the oxyhydroxide of a kind of chromic salt, a kind of magnesium or other divalent metal and a kind of mixture of resin emulsifying agent, smoke subsequently to obtain.This composite inorganic-organic coating satisfies nearly all above-mentioned performance demands, and is commonly referred to as half organic coating.
Yet, traditional composite inorganic-organic coating, full-inorganic coating and full organic coating, when adopting the roller coating machine coating, need be about 100-600 ℃ of baking several seconds to tens seconds.This has limited on production line the High-speed machining to steel plate.For example, 300m/min or higher translational speed are in fact also infeasible, because this needs very long baker, this has just hindered, and productivity improves and the cost reduction.
In addition, form the existing very long history of method of phosphate coating on steel surface, it is believed that this method was proposed by Coslett in 1906, and in addition perfect from 1915 by people such as Parker.The pretreatment coating of the steel plate that phosphate coating has used as automobile, refrigerator, washing machine etc., and the people know that all it has following good performance and comprises: but the adhesivity of rust-preventing characteristic, workability, coating and spot weldability.Yet, do not study binding property after the insulating property, punching out performance, high temperature annealing of crystalline zinc or other phosphate coating and other the required performance of non-oriented electrical steel thin plate.Opening from the spy must a kind of phosphate coating that forms at the electrical steel thin plate of cicada the clear 56-81681.The forming process of this coating is as follows: in aluminum phosphate or other solution, adds colloidal silica, colloidal alumina, boric acid and other material etc., is coated with described solution, and baking then, but do not obtain practical application because of its punching out poor performance.The inventor finds that the punching out poor performance of described coating is because do not obtain the crystalline coating.
The objective of the invention is to make a kind of inorganic coating to form and solve simultaneously the problem of traditional inorganic coating punching out poor performance at short notice, and a kind of non-oriented electrical steel thin plate with the suitable performance of performance that is reached with half traditional organic coating is provided.
In order to reach this purpose, the invention provides:
(1) a kind of non-oriented electrical steel thin plate with good punching out performance is characterized in that it has 0.2～5g/m
2Crystallization zinc phosphate coating as the outmost surface layer;
(2) a kind of non-oriented electrical steel thin plate with good punching out performance is characterized in that on its surface 0.2～5g/m being arranged
2Crystallization zinc phosphate coating;
(3) a kind of non-oriented electrical steel thin plate with good punching out performance is characterized in that on its surface 5g/m being arranged
2Or still less a kind of plating Zn or Ni layer, and one deck 0.2～5g/m is arranged on described coating
2Crystallization zinc phosphate coating;
(4) a kind of production as (1) or (2) described method with non orientation electrical steel thin plate of good punching out performance is characterized in that being included in plating 0.2～5g/m on the surface of non-oriented electrical steel thin plate
2Crystallization zinc phosphate coating;
(5) a kind of production as (2) or (3) described method with non-oriented electrical steel thin plate of good punching out performance, it is characterized in that the surface that is included in the non-oriented electrical steel thin plate carries out the plating of Zn or Ni, to form the electrolytic coating of Zn or Ni, then, plating 0.2～5g/m on described electrolytic coating
2Crystallization zinc phosphate coating;
(6) each the non-oriented electrical steel thin plate with good punching out performance in a kind of basis (1)-(3) is characterized in that having following chemical constitution, by weight:
C≤0.01％,
Si≤4.0％,
Al≤4.0％,
Mn≤3.5％,
P≤0.3％,
S≤0.03％,
N≤0.01％,
B≤0.01％,
Nb≤0.01％,
Ti≤0.01％,
V≤0.01％,
Mo≤0.5％,
Cu≤2％,
Cr≤15％,
Ni≤3％,
Sn≤0.5% and surplus are Fe and unavoidable impurities.
The present invention has three key characters.The first, even the inventor finds that the inorganic coating of crystal habit does not contain the machine component and has the remarkable punching out performance of having improved yet.The second, described inorganic coating can make in a large number by using zinc phosphate, and is on sale and satisfy all necessary performances of non-oriented electrical steel thin plate on the common market of zinc phosphate.The 3rd, the inventor also finds can give described steel sheet a kind of crystallization coating with stable state in the short period of time at the utmost point by electroplating the non-oriented electrical steel thin plate with Zn or Ni, electroplates then and forms zinc phosphate.
The feature of being claimed is done following specifying.
The upper layer of outermost must be made up of the crystallization zinc phosphate.The zinc phosphate crystal exists with laminar form, forms irregular surface, make between steel sheet surface and the punch die to point contacts, thus the punching out performance that steel plate is had improve.Therefore, importantly Zn coating is crystalline.On the contrary, traditional inorganic coating mainly is made of trimagnesium phosphate, and it is non-crystalline state or unbodied, can not form crystal on the steel sheet surface, but form even curface, thereby the punching out performance is significantly worsened.But also will avoid in zinc phosphate, introducing colloidal silica or other additive, because this can lose crystallinity.
Preferably, coating of the present invention only contain zinc or contain zinc and the phosphoric acid solution of nickel in, carry out electrolysis with steel sheet as negative electrode, form fast by chemical conversion.Other known conversion method for example sprays, dipping and roller coat also can use.
The amount of crystallization zinc phosphate coating is limited to 0.2～5g/m
2Scope in.If described amount is less than 0.2g/m
2, electrical insulation capability deficiency then is and if described amount is higher than 5g/m
2, coating is too thick thereby good space factor can not be provided, and both of these case all can bring the problem on the electromagnetic performance to the iron core of electric component.The outermost layer of being made up of the crystallization phosphoric acid zinc coating has determined the fundamental property of electrical steel thin plate to comprise electrical insulation capability and punching out performance, and therefore, importantly outermost layer is formed by zinc phosphate, and does not consider whether to exist the chemical constitution of galvanized bottom or steel sheet.Always will be coated with a kind of oil at surface of steel plate before punching press, this does not produce harmful effect to coating.
The bottom of Zn or Ni is unimportant, but they can provide nucleus, and shorten the required treatment time effectively when existing during chemical conversion is handled.Adopt described steel sheet as negative electrode, electrolysis in containing described ionic acid solution can form homogeneous coating at an easy rate.The amount of in the final steel light sheet products galvanized Zn or Ni that it is to be noted is limited to 5g/m
2Or still less.If described amount surpasses 5g/m
2, electroplated metal can be bonded on the punch die, causes bonding and deterioration punching out performance.Specifically, punching out performance is subjected to the influence of the plating amount of the finished product in essence.When using the bottom of plating Zn, about 0.5-1.0g/m
2Zn can lose because of the corrosion in chemical conversion treatment solution.Therefore, even electroplated 5.5g/m
2Zn, the amount of the finished product depositions Zn is 5.0g/m
2Or still less.The amount of losing because of corrosion depends on for example parameters such as temperature of pH value, time and solution, thereby can not be simply definite.On the other hand, electroplated Ni is dissolved in solution hardly, thereby can pass through 5g/m
2Or plating amount is still less controlled effective Ni amount.Also can make the Zn-Ni alloy plating, although be uneconomic.
Chemical constitution to non-oriented electrical steel thin plate of the present invention makes the following instructions.
C content is limited to 0.01% or lower, and wishes low as far as possible.When C content surpasses 0.01%, the magnetic degenerate problem can take place, cause the magnetic property deterioration of the electric installation in the use.
Si content should be 4.0% or lower.Si can effectively improve the resistivity of steel sheet, and reducing eddy losses, but Si content must avoid surpassing 4.0%, to prevent to take place fracture and occur crackle when the punching press electric component in cold-rolled process.
Al content is limited to and is no more than 4.0%.Similar to Si, Al also can effectively improve the resistivity of steel sheet, and reducing eddy losses, but its amount must avoid surpassing 4.0%, to prevent to take place fracture and occur crackle when the punching press electric component in cold-rolled process.
Mn content should be 3.5% or lower.Mn can improve resistivity effectively, improves the texture of steel sheet simultaneously, but should avoid Mn content to surpass 3.5%, to prevent to occur fracture and occur crackle when the punching press electric component in cold-rolled process.
P content is limited to 0.3% or lower.P can effectively reduce shearing sagging (droop) and the overlap in the punching out process, but reaches 0.3% when above when content, can cause slab to ftracture.
S content is limited to 0.03% or lower, and hope is low as much as possible, because S forms MnS, Cu
xS (x approximates 1.6) or other tiny sulfide, the motion of their meeting retard crystal growths and neticdomain wall.When S content surpassed 0.03%, power loss had just surpassed commercial acceptable level.
N content is limited to 0.01% or lower.When N content surpasses 0.01%, at surface of steel plate bulge or " protruding bubble " can take place.
B content should be 0.01% or lower.B forms BN, to improve magnetic property, surpasses 0.01% but work as its content, can cause the slab cracking.
Nb, Ti and V content should be respectively 0.01% or lower.Nb, Ti or V-arrangement become carbide and nitride, have increased hysteresis loss, thus deterioration power loss, particularly their content respectively above 0.01% o'clock.
Mo content should be 0.5% or lower.Mo has improved the texture of steel sheet, but when content surpasses 0.5%, can increase the cost of material.
Cu content should be 2% or lower.Cu can increase the resistivity of steel sheet effectively and reduce eddy losses, but should avoid its content to surpass 2%, with the surface imperfection that prevents that ears or side handles of a utensil cracking takes place and " copper scab " occur being called in course of hot rolling.
Cr content should be 15% or lower.Cr can effectively increase the resistivity of steel plate with the reduction eddy losses, but its content surpasses at 15% o'clock, can increase the cost of material.
Ni content should be 3% or lower.Ni helps to improve the rigidity of the steel plate that is used for high speed rotor, but when its content surpasses 3%, can increase the cost of material.
Sn content should be 0.5% or lower.Sn can improve the texture of steel plate effectively, but should avoid its content to surpass 0.5%, to prevent that ears or side handles of a utensil cracking takes place in course of hot rolling.
Non-oriented electrical steel thin plate of the present invention can adopt any suitable currently known methods production.Specifically, adopt a kind of steel-making or melting method that the melt of the steel with desired chemical constitution is provided, subsequently it is cast continuously and hot rolling.The hot rolled strip that obtains is annealed, cold rolling once or twice after annealing again, after this, form coating as detailed above on the steel plate after this is cold rolled annealed.The steel plate that has described coating on it also may further carry out skin rolling, and draught is percentum, as through being usually used in producing half-finished non-oriented electrical steel thin plate.
By following specific embodiment the present invention is described in further detail.
Embodiment 1
A kind of plate slab contains: by weight, and 0.002%C, 3.15%Si, 0.7%Al, 1.6%Mn, 0.01%P, 0.001%S, 0.001%N, 0.0001%B, 0.001%Nb, 0.002%Ti, 0.002%V, 0.08%Mo, 0.045%Cu, 0.05%Cr, 0.03%Ni, the Fe of 0.01%Sn and surplus and unavoidable impurities, this steel plate is 1000 ℃ of heating, be rolled into the thick steel band of 1.5mm, batch, 1000 ℃ of high temperature strand-anneal(ing)s of carrying out 30 seconds in nitrogen environment at 600 ℃, pickling, the thick sheet material of cold rolling then one-tenth 0.35mm.This cold-rolled steel sheet carries out 30 seconds annealing under 1000 ℃ in hydrogen atmosphere then, after this, has formed among the No.1-3 shown in the table 1 any insulating blanket on the steel plate after this is cold rolled annealed.
In No.1, adopt a kind of commercially available Ti colloid that the non-oriented electrical steel thin plate of such production is carried out pre-treatment, then in the aqueous solution treatment solution of the orthophosphoric acid salt that contains the zinc hydroxide additive, with 10A/dm
2Current density is carried out 1 second catholyte to it, thereby the formation deposition is 2.5g/m
2Zinc phosphate coating.The described coating of scanning electron microscopy (SEM) analysis revealed to this surface of steel plate is made of the crystalline zinc phosphate.
In No.2,1000 kilograms of anhydrous chromic acids, 200 kilograms of magnesium hydroxides, 100 kilograms of glycerine and 700 kilograms of olefin(e) acid emulsions are dissolved in and form a kind of solution in 3000 kg of water, by roller coating machine with this solution coat to steel plate, baking is 30 seconds under 400 ℃ furnace temperature.The coating of Xing Chenging has 2.1g/m like this
2Settled density.
In No.3, with roller coating machine the trimagnesium phosphate aqueous solution is applied on the steel plate, and under 700 ℃ furnace temperature, toasted 30 seconds.The coating of Xing Chenging has 1.8g/m like this
2Deposition.
Minimum punching out number of times (shot) when reaching 5/100mm with the maximum overlap size of the wide E type parts of the 66mm of EI iron core and definite maximum overlap size by measuring miniature transformer, estimate the punching out performance, 5/100mm is considered to described parts acceptable limit when industrial production usually.The results are shown in the table 1.Should be noted that punch die made by SKD level die steel, under described three kinds of situations, initial overlap is of a size of 2/100mm after the punching press for the first time.
Adopt the method for the test electrical steel thin plate described in the JIS C2550 (1992) to measure interlamination resistance and space factor.
Rustless property is undertaken by the sample of constant temperature constant temperature test in 7 days 55 * 80mm under 60 ℃ and 90% relative humidity.Table 1 also provides the result of this respect, and wherein, rustless sample is marked with " zero ", means " good antirust ability ", even and sample has any to get rusty also is marked with " △ ", means " antirust ability of relative mistake ".
Carried out TIG (tig welding) weldability test under the weldering speed of 40cm/min, table 1 has provided the result, and wherein welding bead place atresia or flawless sample are designated as " zero ", mean " well ".
Bondability during the stress relief annealing between the steel plate is tested by the lamination of being made up of the stamping of 100 E sections cores being carried out pack annealing in 2 hours under 750 ℃ in nitrogen atmosphere, the results are shown in the table 1, even wherein a slice steel disc generation adherent sample is represented with " X ", mean " the anti-binding property of difference ", and the sample that does not have bonding part means " good anti-binding property with " zero " expression.”
Table 1
| Specimen coding | Coating | Punching out performance (* 10 4Impact number of times) | Interlamination resistance (Ω cm 2) | Rustless property | The weldability of tig welding | Binding property * | Remarks |
| ????1 | Zinc phosphate | ????70 | ?????6.5 | ???○ | ??????○ | ???○ | The present invention |
| ????2 | Half is organic | ????70 | ?????6.5 | ???△ | ??????○ | ???○ | Comparative Examples |
| ????3 | Trimagnesium phosphate | ????32 | ?????6.8 | ???○ | ??????○ | ???× | Comparative Examples |
*: during the opposing stress relief annealing adherent ability takes place.
Just as shown in table 1, according to sample No.1 of the present invention, coating wherein forms at short notice, and this sample is compared with the sample No.2 with traditional half organic coating, and performance quite or more excellent.Sample No.3 is a control sample with trimagnesium phosphate coating, has the punching out performance of extreme difference.Epstein (Epstein) detects and shows that all sample No1-3 have good magnetic performance W
15/50=1.8w/kg.
Embodiment 2
A kind of plate slab contains: by weight, and 0.005%C, 0.15%Si, 0.002%Al, 0.2%Mn, 0.08%P, 0.006%S, 0.003%N, 0.0002%B, 0.003%Nb, 0.003%Ti, 0.002%V, 0.003%Mo, 0.025%Cu, 0.03%Cr, 0.06%Ni, the Fe of 0.04%Sn and surplus and inevitable impurity 1200 ℃ of heating, are rolled into the thick steel band of 2.5mm with it, batch pickling, the thick steel plate of cold rolling then one-tenth 0.50mm at 600 ℃.
Subsequently, this cold-rolled steel sheet is 700 ℃ of down annealing 30 seconds in hydrogen atmosphere, after this, among the sample N0.1-6 that is summarized in table 2 for any, have all formed insulating blanket on the steel plate after cold rolled annealed.
With with embodiment 1 in identical method estimated its performance, the result also is shown in table 2.
Table 2
| Sample number into spectrum | Zinc phosphate (g/m 2) | Treatment time (second) | Interlamination resistance (Ω cm 2) | Space factor (%) | Punching out performance (* 10 4Impact number of times) | Remarks |
| ????1 | ????0.1 | ????0.5 | ????2.5 | ???99.8 | ??????100 | Comparative Examples |
| ????2 | ????0.2 | ????0.6 | ????4.3 | ???99.8 | ??????110 | The present invention |
| ????3 | ????1.0 | ????0.8 | ????5.8 | ???99.7 | ??????120 | The present invention |
| ????4 | ????2.5 | ????1.0 | ????6.7 | ???99.3 | ??????120 | The present invention |
| ????5 | ????5.0 | ????2.0 | ????7.1 | ???98.5 | ??????120 | The present invention |
| ????6 | ????6.0 | ????3.0 | ????7.2 | ???98.2 | ??????120 | Comparative Examples |
Adopt commercially available Ti colloid that cold rolling annealed sheet steel or non-oriented electrical steel thin plate are carried out pre-treatment to form insulating coating on sample No.1-6, then in a kind of aqueous solution treatment solution of the orthophosphoric acid salt that contains the zinc hydroxide additive, at 10A/dm
2Under the current density it is carried out 0.1～3 second catholyte of different time and handle, as shown in table 2 with the zinc phosphate coating that formation has different plating amounts, the amount of plating is determined by chemical analysis.
Just as shown in table 2, the plating amount is less than 0.2g/m
2Shi Yinliang can not provide good interlamination resistance and good punching out performance very little.On the other hand, the plating amount surpasses 5g/m
2Can the deterioration space factor.In view of the noticeable change of punching out performance with the composition of non-oriented electrical steel thin plate, thereby also note that for 0.15%Si series non-oriented electrical steel thin plate, when have with embodiment 1 in during employed half identical organic coating, its punching out performance is 1,200,000 jig frequencies (shot).
Surface of steel plate is carried out scanning electron microscopy (SEM) observe, the result shows that the coating among all sample No.1-6 all is made up of the crystallization zinc phosphate.
Embodiment 3
In order further to improve the speed of response that forms coating, the inventor has carried out different research and discovery, before adopting the phosphoric acid solution processing, but by electroplating Zn or Ni augmenting response speed.
On the steel plate in embodiment 2 behind preparation cold rolled annealed, formed the insulating blanket of the sample No.1-6 that is summarized in the table 3.
Adopt the method identical with embodiment 1 that its performance is estimated, the result also is shown in Table 3.
Table 3
| Sample number into spectrum | The pre-plating | Zinc phosphate | Interlamination resistance (Ω cm 2) | Punching out performance (* 10 4The punching out number of times) | Remarks | ||
| Material | Amount * (g/m 2) | Amount (g/m 2) | Treatment time (second) | ||||
| ????1 | ???Zn | ??0.005 | ????2.5 | ????1.0 | ????6.7 | ???????120 | The present invention |
| ????2 | ???Zn | ????1.0 | ????2.5 | ????0.5 | ????6.7 | ???????120 | The present invention |
| ????3 | ???Zn | ????3.0 | ????2.5 | ????0.5 | ????6.7 | ???????120 | The present invention |
| ????4 | ???Zn | ????5.0 | ????2.5 | ????0.5 | ????6.7 | ???????100 | The present invention |
| ????5 | ???Zn | ????6.0 | ????2.5 | ????0.5 | ????6.7 | ????????70 | Comparative Examples |
| ????6 | ???Ni | ????1.0 | ????2.5 | ????0.5 | ????6.7 | ???????120 | The present invention |
* annotate: the deposition of remaining zinc behind the coating zinc phosphate
For sample No.1-5, with steel plate as negative electrode, in 0.1 second set time, at 10-50A/dm
2Under the different current densities of scope, steel plate has been carried out plating Zn to be handled, so that the coating of different Zn depositions is provided for the steel plate of final plating zinc phosphate as shown in table 3, with commercially available Ti colloid it is carried out pre-treatment subsequently, after this, in different electrolysis times, in the treatment solution of the ortho-phosphoric acid solution that contains the zinc hydroxide additive, further described steel plate being carried out catholyte and handle, is 2.5g/m thereby form the average deposition amount
2Zinc phosphate coating.
For sample No.6, treatment process is with recited above identical, is that adopted is plating Ni rather than plating Cr.
Just as shown in table 3, in scope of the present invention, adopt plating Cr or plating Ni, can shorten the treatment time, and guarantee good performance simultaneously.
The scanning electron microscopy (SEM) that surface of steel plate is carried out is observed and is shown that the coating among all sample No.1-6 is made up of the crystalline zinc phosphate.
As described herein, the invention enables a kind of inorganic coating to form at short notice, and a kind of performance non-oriented electrical steel thin plate mutually that is reached with half traditional organic coating that has is provided.
Claims (6)
1. the non-oriented electrical steel thin plate with good punching out performance is characterized in that having the 0.2-5g/m as the outermost top layer
2Crystalline zinc phosphate coating.
2. the non-oriented electrical steel thin plate with good punching out performance is characterized in that its surface has 0.2-5g/m
2Crystallization zinc phosphate coating.
3. the non-oriented electrical steel thin plate with good punching out performance is characterized in that its surface has 5g/m
2Or still less plating Zn or electroplated Ni layer, and on this layer, 0.2-5g/m is arranged
2Crystallization zinc phosphate coating.
4. a method of producing according to the non-oriented electrical steel thin plate of the good punching out performance of having of claim 1 or 2 is characterized in that being included in plating 0.2-5g/m on a kind of non-oriented electrical steel thin plate
2Crystallization zinc phosphate coating.
5. method of producing according to the non-oriented electrical steel thin plate of the good punching out performance of having of claim 2 or 3, it is characterized in that being included on a kind of surface of non-oriented electrical steel thin plate and electroplate Zn or electroplated Ni, to form the electrolytic coating of Zn or Ni, then, plating 0.2-5g/m on this layer
2Crystallization zinc phosphate coating.
6. one kind according to each the non-oriented electrical steel thin plate with good punching out performance among the claim 1-3, it is characterized in that it consists of: by weight,
C≤0.01%, Si≤4.0%, Al≤4.0%, Mn≤3.5%, P≤0.3%, S≤0.03%, N≤0.01%, B≤0.01%, Nb≤0.01%, Ti≤0.01%, V≤0.01%, Mo≤0.5%, Cu≤2%, Cr≤15%, Ni≤3%, the Fe of Sn≤0.5% and surplus and unavoidable impurities.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9353476A JPH11181577A (en) | 1997-12-22 | 1997-12-22 | Nonoriented silicon steel sheet excellent in punchability and its production |
| JP353476/97 | 1997-12-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1225396A true CN1225396A (en) | 1999-08-11 |
Family
ID=18431112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98125400A Pending CN1225396A (en) | 1997-12-22 | 1998-12-22 | Non-oriented electrical steel sheet having good punchability and process for producing same |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH11181577A (en) |
| KR (1) | KR100295088B1 (en) |
| CN (1) | CN1225396A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950964A (en) * | 2016-05-24 | 2016-09-21 | 刘和来 | Non-oriented silicon steel for motor |
| CN106282761A (en) * | 2016-08-02 | 2017-01-04 | 天津市佳利电梯电机有限公司 | A kind of silicon steel, preparation method and application |
| CN107109583A (en) * | 2014-12-24 | 2017-08-29 | Posco公司 | Non-oriented electromagnetic steel sheet and its manufacture method |
| CN115874232A (en) * | 2023-02-27 | 2023-03-31 | 北京科技大学 | Method for preparing gradient high-silicon steel by molten salt electrolysis |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60033950T2 (en) * | 1999-08-09 | 2007-12-06 | Nippon Steel Corp. | PHOSPHATIVE LAYER COMPRISING GALVANIZED STEEL PLATE WITH EXCELLENT FORMABILITY AND METHOD FOR THE PRODUCTION THEREOF |
| PL2366810T3 (en) * | 2008-11-27 | 2019-12-31 | Nippon Steel Corporation | Electrical steel sheet and manufacturing method thereof |
| KR101657465B1 (en) * | 2014-12-18 | 2016-09-19 | 주식회사 포스코 | Non-orientied electrical steel sheet and method for manufacturing the same |
| KR101661897B1 (en) * | 2014-12-24 | 2016-10-05 | 주식회사 포스코 | Non-oriented electrical steel sheet and method for manufacturing the same |
| KR101664097B1 (en) * | 2014-12-24 | 2016-10-10 | 주식회사 포스코 | Non-oriented electrical steel sheet and method for manufacturing the same |
| JP6738047B2 (en) | 2017-05-31 | 2020-08-12 | Ｊｆｅスチール株式会社 | Non-oriented electrical steel sheet and its manufacturing method |
| WO2021065026A1 (en) * | 2019-09-30 | 2021-04-08 | 日本製鉄株式会社 | Surface-treated zinc-based plated steel sheet and method for manufacturing same |
| CN114630918B (en) * | 2019-12-09 | 2023-04-25 | 杰富意钢铁株式会社 | Non-oriented electromagnetic steel sheet, motor core, and method for manufacturing same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0699822B2 (en) * | 1988-02-16 | 1994-12-07 | 川崎製鉄株式会社 | Method for manufacturing ultra low iron loss unidirectional silicon steel sheet |
-
1997
- 1997-12-22 JP JP9353476A patent/JPH11181577A/en not_active Withdrawn
-
1998
- 1998-12-22 KR KR1019980057099A patent/KR100295088B1/en not_active IP Right Cessation
- 1998-12-22 CN CN98125400A patent/CN1225396A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107109583A (en) * | 2014-12-24 | 2017-08-29 | Posco公司 | Non-oriented electromagnetic steel sheet and its manufacture method |
| CN107109583B (en) * | 2014-12-24 | 2019-11-08 | Posco公司 | Non-oriented electromagnetic steel sheet and its manufacturing method |
| US11299792B2 (en) | 2014-12-24 | 2022-04-12 | Posco | Non-oriented electrical steel sheet and manufacturing method therefor |
| CN105950964A (en) * | 2016-05-24 | 2016-09-21 | 刘和来 | Non-oriented silicon steel for motor |
| CN105950964B (en) * | 2016-05-24 | 2020-06-12 | 刘和来 | Non-oriented silicon steel for motor |
| CN106282761A (en) * | 2016-08-02 | 2017-01-04 | 天津市佳利电梯电机有限公司 | A kind of silicon steel, preparation method and application |
| CN106282761B (en) * | 2016-08-02 | 2018-06-29 | 天津市佳利电梯电机有限公司 | A kind of silicon steel, preparation method and application |
| CN115874232A (en) * | 2023-02-27 | 2023-03-31 | 北京科技大学 | Method for preparing gradient high-silicon steel by molten salt electrolysis |
Also Published As
| Publication number | Publication date |
|---|---|
| KR19990063311A (en) | 1999-07-26 |
| JPH11181577A (en) | 1999-07-06 |
| KR100295088B1 (en) | 2001-07-12 |
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