CN103014503B - Normalization-free high-magnetic induction low-iron loss acid etching-resistant non-oriented silicon steel and production method thereof - Google Patents
Normalization-free high-magnetic induction low-iron loss acid etching-resistant non-oriented silicon steel and production method thereof Download PDFInfo
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- CN103014503B CN103014503B CN201210499722.7A CN201210499722A CN103014503B CN 103014503 B CN103014503 B CN 103014503B CN 201210499722 A CN201210499722 A CN 201210499722A CN 103014503 B CN103014503 B CN 103014503B
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Abstract
The invention relates to a normalization-free high-magnetic induction low-iron loss acid etching-resistant non-oriented silicon steel and a production method thereof. The normalization-free high-magnetic induction low-iron loss acid etching-resistant non-oriented silicon steel comprises the following components in percentage by weight: C less than or equal to 0.0050%, 0.30-2.50% of Si, 0.15%-0.80% of Mn, 0.25-0.80% of Al, P less than or equal to 0.050%, S less than or equal to 0.0050%, N less than or equal to 0.0050%, Ti less than or equal to 0.0050% and 0.20-0.45% of Sn+Cu, wherein Sn and Cu are not equal to 0.The production method comprises the following steps of: smelting and casting into a blank; heating and soaking the cast blank to 1080-1150 DEG C; carrying out conventional hot rolling; rolling; pickling; carrying out one-time cold rolling to the thickness of a finished product; and annealing. The normalization-free high-magnetic induction low-iron loss acid etching-resistant non-oriented silicon steel disclosed by the invention is low in Si alloying degree, achieves the P 1.5/50 to the level of medium-high grade non-oriented silicon steels and the magnetic induction B 5000 higher than that of common non-oriented silicon steels by more than 0.08 T and equivalent to that of high-magnetic induction non-oriented silicon steels with same iron loss grades, is very conductive to enhancing the stability of a motor operated in a harsh environment for a long time and prolonging the service life of the motor and can also reduce the rusting loss in producing, storing, transporting and using processes.
Description
Technical field
The present invention relates to non orientating silicon steel and production method thereof, specifically do not need hot-rolled sheet to carry out brand-new serial non orientating silicon steel product and the production method thereof that normalizing processing can be produced that the common cold rolling non-orientation silicon steel iron loss of more equal Si content is lower, magnetic strength is higher and be had good acid corrosion-resistant performance.This product is applicable to making especially all kinds of high efficiency electric iron cores of all kinds of motors very much, is conducive to reduce the corrosion of silicon steel production and manufacturing cost, minimizing storing and use procedure and improves life-span and the stability that motor moves in severe environment.
Background technology
Before the present invention, on market, a large amount of uses is common cold rolling non-orientation silicon steel, is difficult to adapt to the development of electromechanical industries and iron core manufacturing technology.Later stage in last century, about the country of silicon steel production unit and advanced technology and enterprise, to start to research and develop energetically iron loss P1.5/50 value suitable with common non orientating silicon steel, magnetic strength B5000 the non-oriented silicon steel with high magnetic induction more than high 0.05～0.10T of more common non orientating silicon steel to meet the continuous miniaturization of electronic product, high precision int and high efficiency requirement.At present, You Duo company of Japan has developed multiple full technique or the half process high magnetic induction non orientating silicon steel product of 0.35mm and two kinds of thickness specifications of 0.50mm, and set up respectively company standard, the for example JNE of JFE company, JNA, RP, RM(Kawasaki Steel) and BF, BS(NKK) non-oriented silicon steel with high magnetic induction product, the SX series of Sumitomo Metal Industries and the NC of Nippon Steel Corp series non-oriented silicon steel with high magnetic induction product etc.; Wuhan Iron and Steel Plant company of China has developed 0.35mm and two kinds of specifications of 0.50mm amount to 26 trade mark X-complete series business high magnetic sensing cold milling orientation less silicon steel, and formulated " high magnetic sensing cold milling orientation less silicon strip (sheet) " GB/T25046-2010 national standard taking it as technical foundation, this standard has started to issue on June 1st, 2011 to be implemented; Baosteel company of China has developed 0.35mm and two kinds of 6 full techniques of the trade mark of thickness specification AH series of 0.50mm and AR 2 trade mark half handicraft product non-oriented silicon steel with high magnetic inductions of series and has set up company standard.Although the said products has all been realized low-iron loss high-magnetic strength; but especially Si content is still higher for the overall alloying level of its each trade mark steel; in production technique, also must increase Hot Rolled Plate Normalizing annealing operation guarantee magnetism index; it is the same with ordinary silicon product made from steel not corrosion-resistant simultaneously; in production, storing and motor manufacture, the loss of use procedure easy-to-rust, be also difficult to ensure to move life-span and the stability of motor in severe environment.
Summary of the invention
The object of the invention is on existing common and non-oriented silicon steel with high magnetic induction basis by reducing Si content, adding the technical measures such as a small amount of microalloy element and combination working process parameter; providing a kind of can produce magnetic strength B5000 and reach that 1.70T is above, iron loss P1.5/50 is less than 4.70W/kg, and has non orientating silicon steel and the production method thereof of better acid corrosion-resistant performance without hot-rolled sheet being carried out to normalizing annealing processing.
Realize the measure of above-mentioned purpose:
The low iron of high magnetic strength without normalizing damages resistance to acid attack non orientating silicon steel; its component and weight percent content are: C≤0.0050%, Si:0.30～2.50%, Mn:0.15～0.80%, Als:0.25～0.80%, P≤0.050%, S≤0.0050%, N≤0.0050%, Ti≤0.0050%, Sn+Cu:0.20～0.45% and Sn and Cu are all non-vanishing, and surplus is Fe and is inevitably mingled with.
Preferred: C < 0.0030%, P < 0.020%, S < 0.0030%, N < 0.0030%, Ti < 0.0030%.
Produce the method for damaging resistance to acid attack non orientating silicon steel without the low iron of high magnetic strength of normalizing, its step:
1) smelt and cast base;
2) strand heated and be soaked to 1080～1150 DEG C;
3) carry out conventional hot rolling;
4) hot-rolled strip batches, and controls coiling temperature at 720～780 DEG C;
5) hot-rolled sheet pickling routinely;
6) acid-cleaning plate carries out the disposable finished product thickness that is cold-rolled to routinely;
7) cold-reduced sheet is annealed, and controls annealing temperature at 860～980 DEG C, and annealing atmosphere is N
2+ H
2mixed gas, annealing time is controlled at 3～8 minutes.
Preferred: to control slab heating temperature at 1080～1120 DEG C.
Preferred: to control coiling temperature at 740～780 DEG C.
It is characterized in that: after hot rolling reeling Direct Air-Cooled to room temperature, or stacking air cooling or carry out slow cooling to room temperature in temperature is not less than the hole of 150 DEG C.
It is characterized in that: when in cold-rolled steel strip when C≤0.0028%, annealing atmosphere is dry state H
2+ N
2mixed gas.
The principle of steel chemical composition design of the present invention is as follows:
C: gap, in α-Fe, makes lattice distortion, significantly increases iron loss, reduces magnetic strength, harmful to magnetic, and the C in finished product passes in time at normal temperatures can precipitation to separate out and causes that timeliness worsens magnetic.Raw material C too high levels, reduces unit speed and throughput for decarburization time will extend, improve humidification water temperature simultaneously and increase finished steel plate surface oxidation and degrade performance.The present invention specifies C≤0.0050, optimum range < 0.0028%.
Si: be dissolved in ferrite, improve matrix resistivity, reduce eddy-current loss, significantly reduce iron loss, but also make magnetic property variation simultaneously, reduce magnetic strength, in the time that Si content reaches certain level, continue to increase Si content, the effect that reduces iron loss weakens, worsens the effect increase of magnetic strength.Regulation Si scope of the present invention is 0.30 ~ 2.50%, and while being less than 0.30%, product is too soft is not suitable for general use, and while being greater than 2.50%, B5000 is difficult to reach high magnetic strength requirement.
Mn: being dissolved in ferrite has the effect that reduces iron loss, forms stable MnS with inevitable inclusion S, reduces the harm of S to magnetic, also can prevent hot-short.Regulation Mn scope of the present invention is 0.15 ~ 0.50%, solid S scarce capacity lower than 0.15% time, and higher than 0.50% time, Ac
1temperature reduces, and α → γ phase transformation easily occurs finished products, destroys recrystallized structure.
Als: act on similarly to Si, be dissolved in ferrite, improve matrix resistivity, coarsened grain, simultaneously can also deoxidation, fixed nitrogen, obviously reducing iron loss but also reducing magnetic strength simultaneously.Regulation Al scope of the present invention is 0.25 ~ 0.80%.Advantageous effect is not obvious lower than 0.25% time, very easily causes oxidation and degradation performance in steel plate higher than 0.80% time.
P: be dissolved on a small quantity ferrite, can significantly improve matrix resistivity decreased iron loss, it is again positive segregation element simultaneously, favourable promotion recrystallize and recrystal grain are grown up, indium addition improves very favourable to common silicon steel or common high magnetic strength magnetic, but in characteristic component steel of the present invention, the interpolation of P does not have obvious effect to magnetic and resistance to acid attack improved performance.The present invention specifies P≤0.050%, optimum range < 0.020%.
S: all harmful to processibility and magnetic, form small and dispersed MnS particle with Mn and hinder finished products grain growth, severe exacerbation magnetic, forms low melting point FeS and FeS with Fe
2or eutectic, easily cause brittleness from hot-working.The present invention specifies S≤0.005%, optimum range < 0.0030%.
N: easy and Al, Ti etc. form the nitride particle of small and dispersed, in finished products process, meeting obstruction recrystallize and recrystal grain are grown up, under the N room temperature of solid solution in α-Fe, meeting precipitation is separated out and is caused magnetic aging, severe exacerbation electronic product performance, the present invention specifies N≤0.005%, optimum range < 0.0030%.
Ti: dissolve in ferrite, but the effect that improves matrix resistivity decreased iron loss is not obvious, because it is strong C, N compound forming element, the separating out of its small and dispersed particle can serious hinder recrystallize and recrystal grain is grown up, extremely harmful to magnetic, the present invention specifies Ti≤0.005%, optimum range < 0.0030%.
Sn, Cu: be all dissolved in ferrite, all can significantly improve matrix resistivity, reduce iron loss, simultaneously Sn is again positive segregation element, favourable promotion recrystallize and improve recrystallization texture, its on surface or grain boundaries segregation can reduce oxidation and active oxygen in top layer and permeate to base steel along crystal boundary; Cu is again the very effective element that improves low alloy steel weather-resistant performance, also can make the S in residual steel further innoxious.Regulation Sn of the present invention, Cu must be compound interpolations, the compound interpolation scope of Sn+Cu be 0.20 ~ 0.45% and Sn and Cu all non-vanishing, can not realize low-iron loss high-magnetic strength and high acid corrosion-resistant performance lower than 0.20% time, also multiple-effect fruit more not higher than 0.45% time, and increase production cost.
The present invention compared with prior art, its feature:
1) steel of the present invention is low with the common of iron loss rank and non-oriented silicon steel with high magnetic induction Si alloying level, but its P1.5/50 can reach middle high grade non-oriented silicon steel level, more than the high 0.08T of the more common non orientating silicon steel of magnetic strength B5000, suitable with the non-oriented silicon steel with high magnetic induction of same iron loss rank.
2) the present invention has the common and not available good acid corrosion-resistant performance of non-oriented silicon steel with high magnetic induction.
3) the present invention does not need online hot-rolled sheet to be carried out to normalizing annealing processing and can make finished product obtain good comprehensive magnetic yet, the more common middle high trade mark simplified with non-oriented silicon steel with high magnetic induction together with main production process, can obviously reduce production costs, improve production line production capacity.
4) the especially all kinds of high efficiency electrics of all kinds of motors that can make of steel of the present invention move for a long time the stability of motor and extend motor very favourable work-ing life to improving in severe environment, also can reduce the corrosion loss of silicon steel production, storing and use procedure.
Embodiment
Below the present invention is described in detail:
Table 1 is various embodiments of the present invention and the list of comparative example Chemical Composition in Cast Billet;
Table 2 is main production and the parameter list of various embodiments of the present invention and comparative example;
Table 3 is various embodiments of the present invention and comparative example are gone out finished product magnetic, the list of acid corrosion rate by different states Hot Rolling Plate Production.
Various embodiments of the present invention and comparative example are produced according to following key step and process parameters range:
1) smelt and cast base;
2) strand heated and be soaked to 1100～1180 DEG C;
3) carry out conventional hot rolling;
4) hot-rolled strip batches, and controls coiling temperature at 711～770 DEG C; After hot rolling reeling respectively Direct Air-Cooled or stacking air cooling or in the hole that is greater than 150 DEG C slow cooling to room temperature.
5) hot-rolled sheet pickling routinely;
6) acid-cleaning plate carries out the disposable finished product 0.50mm thickness that is cold-rolled to routinely;
7) cold-reduced sheet is annealed, and controls annealing temperature at 870～960 DEG C, and annealing atmosphere is respectively dry or wet N
2+ H
2mixed gas, annealing soaking time is controlled at 4～6 minutes.
Table 1 embodiment of the present invention and comparative example Chemical Composition in Cast Billet (% by weight meter)
Table 2 embodiment of the present invention and comparative example main production and parameter
Finished product magnetic, acid corrosion rate that table 3 embodiment of the present invention and comparative example different states Hot Rolling Plate Production go out
Performance test explanation: finished product magnetic is for liking Epstein test result; Acid etching rate is 24 hours post-etching rates (%) of 5% sulphuric acid soln soaking at room temperature.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (3)
1. damage resistance to acid attack non orientating silicon steel without the low iron of high magnetic strength of normalizing; its component and weight percent content are: C≤0.0030%, Si:1.73～2.50%, Mn:0.15～0.48%, Als:0.58～0.80%, P≤0.020%, S≤0.0030%, N≤0.0030%, Ti≤0.0030%, Sn+Cu:0.20～0.45% and Sn and Cu are all non-vanishing, and surplus is Fe and is inevitably mingled with.
2. the method that the low iron of the high magnetic strength without normalizing described in production claim 1 damages resistance to acid attack non orientating silicon steel, its step:
1) smelt and cast base;
2) strand heated and be soaked to 1080～1150 DEG C;
3) carry out conventional hot rolling;
4) hot-rolled strip batches, and controls coiling temperature at 720～780 DEG C;
5) hot-rolled sheet pickling routinely;
6) acid-cleaning plate carries out the disposable finished product thickness that is cold-rolled to routinely;
7) cold-reduced sheet is annealed, and controls annealing temperature at 930～980 DEG C, and annealing atmosphere is dry state H
2+ N
2mixed gas, annealing time is controlled at 3～8 minutes.
3. the method that production as claimed in claim 2 is damaged resistance to acid attack non orientating silicon steel without the low iron of the high magnetic strength of normalizing, is characterized in that: after hot rolling reeling Direct Air-Cooled to room temperature, or stacking air cooling or carry out slow cooling to room temperature in temperature is not less than the hole of 150 DEG C.
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|---|---|---|---|
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| CN201210499722.7A CN103014503B (en) | 2012-11-30 | 2012-11-30 | Normalization-free high-magnetic induction low-iron loss acid etching-resistant non-oriented silicon steel and production method thereof |
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| CN103014503B true CN103014503B (en) | 2014-09-17 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103436796B (en) * | 2013-09-10 | 2015-10-14 | 武汉钢铁(集团)公司 | A kind of frequency-changeable compressor non-oriented electrical steel and production method thereof |
| CN104195426B (en) * | 2014-03-26 | 2017-02-15 | 浙江龙盛薄板有限公司 | Semi-processed non-oriented silicon steel and manufacturing method thereof |
| CN105239005B (en) * | 2015-11-27 | 2017-03-22 | 武汉钢铁(集团)公司 | High-permeability non-oriented silicon steel and production method |
| CN106119496A (en) * | 2016-08-08 | 2016-11-16 | 浙江华赢特钢科技有限公司 | A kind of production technology of modified model non-oriented silicon steel with high magnetic induction sheet |
| CN107385335B (en) * | 2017-08-08 | 2018-12-11 | 马钢(集团)控股有限公司 | A kind of new-energy automobile driving motor non-orientation silicon steel thin belt and manufacturing method |
| CN109852878B (en) | 2017-11-30 | 2021-05-14 | 宝山钢铁股份有限公司 | Non-oriented electrical steel sheet having excellent magnetic properties and method for manufacturing the same |
| CN107964631B (en) * | 2017-12-15 | 2020-02-18 | 武汉钢铁有限公司 | Non-oriented silicon steel with yield strength of more than or equal to 500MPa for high-speed motor rotor and production method |
| CN112430780B (en) | 2019-08-26 | 2022-03-18 | 宝山钢铁股份有限公司 | Cu-containing high-cleanliness non-oriented electrical steel plate and manufacturing method thereof |
| CN112143974B (en) * | 2020-09-27 | 2021-10-22 | 江苏省沙钢钢铁研究院有限公司 | Production method of non-oriented silicon steel and non-oriented silicon steel |
| CN112609128B (en) * | 2020-11-30 | 2022-06-17 | 武汉钢铁有限公司 | Non-oriented silicon steel plate with excellent corrosion resistance for high-efficiency motor and production method thereof |
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| CN101906577A (en) * | 2010-07-16 | 2010-12-08 | 武汉钢铁(集团)公司 | Non-oriented electrical steel produced by sheet continuous casting and rolling and method thereof |
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| CN101906577A (en) * | 2010-07-16 | 2010-12-08 | 武汉钢铁(集团)公司 | Non-oriented electrical steel produced by sheet continuous casting and rolling and method thereof |
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