CN102925795A - Production method for controlling transverse and longitudinal electromagnetic properties of low and medium grade products of non-oriented electrical steel - Google Patents
Production method for controlling transverse and longitudinal electromagnetic properties of low and medium grade products of non-oriented electrical steel Download PDFInfo
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- CN102925795A CN102925795A CN2012104059787A CN201210405978A CN102925795A CN 102925795 A CN102925795 A CN 102925795A CN 2012104059787 A CN2012104059787 A CN 2012104059787A CN 201210405978 A CN201210405978 A CN 201210405978A CN 102925795 A CN102925795 A CN 102925795A
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Abstract
The invention provides a production method for controlling transverse and longitudinal electromagnetic properties of low and medium grade products of non-oriented electrical steel, wherein the carbon content is less than 0.01% and the silicon or silicon-aluminum content is less than 1.7% in the steel, and the harmful chemical components in the steels are strictly controlled during smelting; the equiaxed grain structure in a casting blank is more than 40%; the hot-rolling heating temperature is not greater than 1200 DEG C, the last pass reduction rate in rough rolling is 30%-60%, the temperature is in a single-phase region of a ferrite or austenite, the blank thickness before finishing rolling is 50-15mm, the single-phase region rolling is employed, the last pass reduction rate is greater than 5%, the incubation time after rolling is more than 5 seconds, and the re-cooling and coiling temperature is not less than 670 DEG C; the reduction rate in cold rolling is greater than 75%, and the first pass reduction rate is greater than 25%; the heating rate in a heat treatment furnace is greater than 5 DEG C/s; and the rewinding production tension is controlled to below 20N/mm<2>. According to the invention, the transverse and longitudinal electromagnetic properties of products are excellent and the magnetic property difference is controlled to below 3% on the basis of retaining excellent electromagnetic properties of the whole non-oriented electrical steels.
Description
Technical field
The invention belongs to technical field of steel production, relate in particular to the isotropic production method of low trade mark product raising electromagnetic performance in a kind of non-oriented electrical steel.
Background technology
Cold rolling non-oriented electrical steel is little because of anisotropy, i.e. excellent magnetic in length and breadth, and the iron core that mainly is used in swivel arrangement is made.But strictly speaking, in modern ordinary method farm labourer's order production process, be subjected to the impact of specific factor, the transverse and longitudinal electromagnetic performance still there are differences, still have certain impact and restriction for the now design of rotary high-efficient device, the magnetic deflection of, high-frequency high-speed unstable such as the periodic magnetic circuit of large-scale rotating member or supercritical velocity operation member, shake etc. factor is normal relevant with electrical steel transverse and longitudinal magnetic difference partially.
Cold rolling non-oriented electrical steel is along with the bulk alloy element is different; different such as silicon content; the mechanism characteristic of steel grade there are differences; as smelt carbon content control below 0.01%, silicon (or sial total) content 1.7% when following; there is the two-phase region in low trade mark steel grade in the non-oriented electrical steel of producing, and is not controlled aborning and usually can cause magnetic respectively to difference.
Summary of the invention
The object of the invention is to overcome the existing deficiency of above-mentioned prior art, provide a kind of and can eliminate or alleviate each production method to electromagnetic performance difference of low trade mark product in the non-oriented electrical steel, to improve the suitability of product.
Technical solution of the present invention is applicable to but is not limited to the production of hanging down trade mark series product in the non-oriented electrical steel, but more be applicable to the product that there is two-phase region (austenite and ferrite) design in original steel grade, the product of (or the sial total) content of silicon in the steel below 1.7%.
Technical solution of the present invention mainly is applicable in the modern routine technological process of production of low code non-oriented electrical steel product, mainly comprises: hot metal pretreatment, converter smelting, refining, continuous casting, heating, hot rolling, pickling, cold rolling, alkali cleaning, thermal treatment, coating, rewinding, packing.
The technical solution of the present invention best applications is that the integrally combined of following method is used, but is not limited to this, also can carry out the combination of Part Methods according to production and flow process situation, or the development on the Part Methods combination foundation.
The concrete technical scheme of the present invention is as follows:
Harmful chemical component during smelting in the strict control steel grade except the specific addition element of steel grade demand, is avoided itself and the segregation of compound formation as cast condition thereof, suppresses specific texture component and generate in integral body is made, or hinder grain growth; Such as the content of harmful chemical composition carbon, sulphur, oxygen, nitrogen, niobium, vanadium, titanium, nickel, zirconium, its content weight percent all is controlled at below 0.005%, and optimum content is controlled at below 0.0020%.
The strand equiaxed grain structure is controlled at more than 40%, and optimum target is more than 60%, reduces columanar structure and the dendritic structure of the distinctive prosperity of silicon steel steel grade, prevents the generation with the linear deformation in the post-treatment and thick band tissue.
The hot rolling heating and temperature control avoids texture of coarse crystal to produce at 1200 ℃ and following, and optimum temps is 1100 ℃ and following.
Strand roughing in rolling minute and finish rolling dual mode are discussed: roughing is more than thick rolling 15 mm of original base, in this process, the final pass draft is controlled at 30% ~ 60%, best draft is 50%, and temperature is (ferrite or austenite) in the single phase region, optimum temps is temperature between the austenitic area, and purpose is broken heating coarse grain and recovers equi-axed crystal; The front base of finish rolling is thick to be 50mm to 15mm, adopts the single phase region rolling, and the best is that ferrite area is rolling, and extreme trace time draft is set in more than 5%, and the best is more than 15%, promotes the product of steel band dynamic recrystallized structure.
After the hot rolling, the steel band incubation time, Best Times was more than 20 seconds greater than 5 seconds, promote the generation of steel band Static Recrystallization tissue, then cool off and steel strip coiling, coiling temperature be controlled at 670 ℃ reach more than, optimum temps is more than 710 ℃, is in order to promote recrystallized structure production equally.
Cold rolling whole draft control is more than 75%, and the best is more than 80%; First is controlled at more than 25%, and the best is more than 35%, the broken original thick tissue of purpose.
Be rapidly heated in the thermal treatment, temperature rise rate be 5 ℃/more than the s, best mode is the naked light nonoxidizing heating, the control temperature rise rate is greater than 15 ℃/s, purpose reduces different crystal structure organization growth differences for increasing number of nuclei; Should control the stove internal tension at 4N/mm such as continuous production
2Below, the best is 1.6N/mm
2Below, slacken grain sliding to easy generation direction rotation etc.
In the rewinding production take this product yield strength index as reference, the low-tension operation, be preferably under the Minimal Tension that keeps stable operation of unit and control, prevent the user use performance to change or user's processing and heat treatment after transverse and longitudinal magnetic property difference strengthen, optimum tension is controlled at 16N/mm
2Below.
By this technical scheme, keeping on the good basis of the whole electromagnetic performance of non-oriented electrical steel, PRODUCTS FIELD is all excellent to electromagnetic performance, and magnetic difference controlled to below 3% below 8% by market is generally accepted.
Embodiment
The present invention is further illustrated below by embodiment.
Embodiment 1:
The chemical component weight per-cent of embodiment of the invention electrical steel is: C:0.002%, and Si:1.25%, Mn:0.30%, P:0.010%, S:0.003%, Als:0.27%, all the other are iron and inevitable impurity element.
The method that the embodiment of the invention improves property of non-oriented electric steel comprises following process steps:
A) smelt: adopt converter smelting, the RH vacuum refinement is processed, and continuous casting becomes steel billet, continuous casting employing induction stirring, control equiaxed grain structure 55%;
B) hot rolling: with heating steel billet to 1150 ℃, start rolling temperature is 1130 ℃, last percentage pass reduction 40% of roughing, and finishing temperature is 860 ℃, extreme trace time draft 9%, 15 seconds steel band incubation times, coiling temperature is 720 ℃;
C) cold rolling: steel plate becomes 0.5mm thick through cold continuous rolling, and first is controlled at 28%.Steel plate width is 1020mm;
D) finished products: 12 ℃/s of cold-rolling of steel plate temperature rise rate, production should be controlled the stove internal tension at 2.2N/mm continuously
2
E) rewinding packing: production should be controlled the stove internal tension at 12N/mm
2
The product electromagnetic performance: longitudinal P 15 is 4.22W/kg, and B5000 is 1.711T; Laterally P15 is 4.54W/kg, and B5000 is 1.685T, and iron loss transverse and longitudinal poor performance is 7.58%, and magnetic strength transverse and longitudinal poor performance is 1.52%.
Embodiment 2:
The chemical component weight per-cent of embodiment of the invention electrical steel is: C:0.0015%, and Si:1.25%, Mn:0.30%, P:0.010%, S:0.001%, Als:0.27%, all the other are iron and inevitable impurity element.
The method that the embodiment of the invention improves property of non-oriented electric steel comprises following process steps:
A) smelt: adopt converter smelting, the RH vacuum refinement is processed, and continuous casting becomes steel billet, continuous casting employing induction stirring, control equiaxed grain structure 65%;
B) hot rolling: with heating steel billet to 1060 ℃, start rolling temperature is 1020 ℃, last percentage pass reduction 50% of roughing, and finishing temperature is 860 ℃, extreme trace time draft 18%, 25 seconds steel band incubation times, coiling temperature is 720 ℃;
C) cold rolling: steel plate becomes 0.5mm thick through cold continuous rolling, and first is controlled at 38%.Steel plate width is 1020mm;
D) finished products: 18 ℃/s of cold-rolling of steel plate temperature rise rate, production should be controlled the stove internal tension at 1.2N/mm continuously
2
E) rewinding packing: production should be controlled the stove internal tension at 12N/mm
2
The product electromagnetic performance: longitudinal P 15 is 4.37W/kg, and B5000 is 1.702T; Laterally P15 is 4.41W/kg, and B5000 is 1.698T, and iron loss transverse and longitudinal poor performance is 0.92%, and magnetic strength transverse and longitudinal poor performance is 0.24%.
Claims (8)
1. the production method of low trade mark control of product transverse and longitudinal electromagnetic performance in the non-oriented electrical steel, silicon or sial content＜1.7% in the steel, it is characterized in that: the content of the harmful chemical component carbon during smelting in the strict control steel, sulphur, oxygen, nitrogen, niobium, vanadium, titanium, nickel, zirconium, its content weight percent all is controlled at below 0.005%; Strand equiaxed grain structure＞40%; Hot rolling Heating temperature≤1200 ℃, roughing final pass draft is controlled at 30% ~ 60%, temperature is controlled at ferrite or austenitic single phase region, the front base of finish rolling is thick to be 50～15mm, the employing single phase region is rolling, and extreme trace time draft＞5% rolls post inoculation time＞5 second, cool off again, batch, coiling temperature 〉=670 ℃; Cold rolling draft＞75%, the first passage＞25%; Temperature rise rate in the heat treatment furnace＞5 ℃/s; Rewinding production tension control is at 20N/mm
2Below.
2. hang down the production method of trade mark control of product transverse and longitudinal electromagnetic performance in the non-oriented electrical steel according to claim 1, the content of carbon, sulphur, oxygen, nitrogen, niobium, vanadium, titanium, nickel, zirconium all is controlled at below 0.0020% when it is characterized in that described the smelting.
3. the production method of low trade mark control of product transverse and longitudinal electromagnetic performance in the non-oriented electrical steel according to claim 1, it is characterized in that described strand equiaxed grain structure be controlled at＞60%.
4. hang down the production method of trade mark control of product transverse and longitudinal electromagnetic performance in the non-oriented electrical steel according to claim 1, it is characterized in that described hot rolling Heating temperature≤1100 ℃, roughing final pass draft is controlled at 50%, temperature is temperature between the austenitic area, finish rolling is ferrite region rolling temperature, extreme trace time draft＞15% rolls post inoculation time＞20 second, coiling temperature＞710 ℃.
5. the production method of low trade mark control of product transverse and longitudinal electromagnetic performance in the non-oriented electrical steel according to claim 1 is characterized in that described cold rolling draft＞80%, the first passage＞35%.
6. the production method of low trade mark control of product transverse and longitudinal electromagnetic performance in the non-oriented electrical steel according to claim 1 is characterized in that described heat treatment furnace temperature rise rate＞15 ℃/s, stove internal tension＜4N/mm
2
7. the production method of low trade mark control of product transverse and longitudinal electromagnetic performance in the non-oriented electrical steel according to claim 6 is characterized in that described stove internal tension＜1.6kN/mm
2
8. the production method of low trade mark control of product transverse and longitudinal electromagnetic performance in the non-oriented electrical steel according to claim 1 is characterized in that tension control is at 16N/mm in the described rewinding production
2Below.
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| CN103510004A (en) * | 2013-09-24 | 2014-01-15 | 马钢(集团)控股有限公司 | Method for manufacturing low-grade cold-rolled non-oriented electrical steel |
| CN103510006A (en) * | 2013-09-24 | 2014-01-15 | 马钢(集团)控股有限公司 | Method for manufacturing cold-rolled non-oriented electrical steel for contactor |
| CN107630130A (en) * | 2016-07-18 | 2018-01-26 | 鞍钢股份有限公司 | A kind of excellent non-oriented electrical steel product processes of longitudinal electromagnetic performance |
| CN112030059A (en) * | 2020-08-31 | 2020-12-04 | 武汉钢铁有限公司 | Short-process production method of non-oriented silicon steel |
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| CN103510004A (en) * | 2013-09-24 | 2014-01-15 | 马钢(集团)控股有限公司 | Method for manufacturing low-grade cold-rolled non-oriented electrical steel |
| CN103510006A (en) * | 2013-09-24 | 2014-01-15 | 马钢(集团)控股有限公司 | Method for manufacturing cold-rolled non-oriented electrical steel for contactor |
| CN103510004B (en) * | 2013-09-24 | 2016-06-29 | 马钢(集团)控股有限公司 | A kind of manufacture method of low grade cold rolling non-oriented electrical sheet |
| CN103510006B (en) * | 2013-09-24 | 2016-08-10 | 马钢(集团)控股有限公司 | A kind of manufacture method of catalyst cold rolling non-oriented electrical steel |
| CN107630130A (en) * | 2016-07-18 | 2018-01-26 | 鞍钢股份有限公司 | A kind of excellent non-oriented electrical steel product processes of longitudinal electromagnetic performance |
| CN112030059A (en) * | 2020-08-31 | 2020-12-04 | 武汉钢铁有限公司 | Short-process production method of non-oriented silicon steel |
| CN112030059B (en) * | 2020-08-31 | 2021-08-03 | 武汉钢铁有限公司 | Short-process production method of non-oriented silicon steel |
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Application publication date: 20130213 |