CN102912104A - Production method for improving isotropy of electromagnetic performance of medium and high-grade products of non-oriented electrical steel - Google Patents
Production method for improving isotropy of electromagnetic performance of medium and high-grade products of non-oriented electrical steel Download PDFInfo
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- CN102912104A CN102912104A CN2012104080970A CN201210408097A CN102912104A CN 102912104 A CN102912104 A CN 102912104A CN 2012104080970 A CN2012104080970 A CN 2012104080970A CN 201210408097 A CN201210408097 A CN 201210408097A CN 102912104 A CN102912104 A CN 102912104A
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Abstract
The invention provides a production method for improving the isotropy of the electromagnetic performance of medium and high-grade products of non-oriented electrical steel. Original steel balls used in the production method are of a single ferrite area design, and the content of silicon or silicon-aluminum in the steel is higher than 1.7%. The production method is characterized in that contents of harmful chemical components in the steel are lower than 0.005% during smelting; the content of an equiaxial structure of each casting blank is higher than 50%; the heating temperature for hot rolling is lower than or equal to 1250 DEG C, the last-pass reduction rate of rough rolling ranges from 30% to 60%, the temperature of rough rolling ranges from 900 DEG C to 1180 DEG C, the thickness of each blank before finish rolling ranges from 50mm to 15mm, the start rolling temperature is higher than 880 DEG C, the final-pass reduction rate is higher than 5%, the finish rolling temperature is higher than 800 DEG C, the after-rolling inoculation time is longer than 5 seconds, recooling is performed, and the take-up temperature is higher than or equal to 670 DEG C; the reduction rate of cold rolling is higher than 75%, and the first-pass reduction rate is higher than 25%; the temperature rise rate of the inside of a heat treatment furnace is higher than 5 DEG C per second; and rewinding is carried out under low tension. The production method has the advantages that on the basis that the excellent integral electromagnetic performance of the non-oriented electrical steel is maintained, both the longitudinal electromagnetic performance and the transverse electromagnetic performance of the products are excellent, and the magnetic difference of each product is lower than 4%.
Description
Technical field
The invention belongs to technical field of steel production, relate in particular to the isotropic production method of high 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%, when silicon (or sial total) content 1.7% is above, high trade mark steel grade does not exist phase region to change in the non-oriented electrical steel of producing, and is not controlled aborning the easier magnetic that causes 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 high trade mark product in the non-oriented electrical steel, to improve the suitability of product.
Technical solution of the present invention is applicable to the production of high trade mark series product in the non-oriented electrical steel, and namely being applicable to original steel grade is the product of single ferrite area design, the product of silicon (or sial total) content more than 1.7%.Technical process of the present invention is: hot metal pretreatment, converter smelting, refining, continuous casting, heating, hot rolling, normalizing (or preannealing processing), pickling, cold rolling (contain secondary cold-rolling or add smooth processing), alkali cleaning, thermal treatment (containing second heat treatment), coating, rewinding, packing.
The technical characteristics of production method 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 the harmful element segregation, suppresses the favorable texture component and generate in integral body is made, or hinder grain growth; Content such as harmful chemical ingredients carbon, sulphur, oxygen, nitrogen, niobium, vanadium, titanium, nickel, zirconium 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 50%, 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 1250 ℃ and following, and optimum temps is 1100 ℃ and following.
Strand roughing in rolling minute and finish rolling dual mode: to be that original base is thick be rolling to more than the 15mm in roughing, in this process, the final pass draft is controlled at 30% ~ 60%, best draft is 50%, temperature is controlled at 900 ~ 1180 ℃, the best is below 1000 ℃, 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, and the temperature open rolling is controlled more than 880 ℃, and the best is more than 950 ℃, extreme trace time draft is set in more than 5%, and the best is more than 15%, and finishing temperature is more than 800 ℃, the best is 880 ℃, and purpose is for promoting 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 730 ℃, is in order to promote recrystallized structure production equally.
Can carry out steel band normalizing processing or preannealing and process, process to generate 100% recrystallized structure as target.
Cold rolling whole draft is controlled at 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 below 4MPa such as continuous production, the best is below the 1.6MPa, slackening grain sliding to the rotation of easy generation direction etc., and is applicable to second annealing and processes.
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 below the 16MPa.
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 is by having controlled to below 4% below 8%.
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:2.35%, Mn:0.23%, P:0.012%, S:0.003%, Als:0.22%, 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 53%;
B) hot rolling and normalizing are processed: with heating steel billet to 1140 ℃, start rolling temperature is 1080 ℃, last percentage pass reduction 45% of roughing, and finishing temperature is 880 ℃, extreme trace time draft 18%, 14 seconds steel band incubation times, coiling temperature is 820 ℃; Hot rolling is processed by normalizing, and recrystallize all occurs deformed grains;
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: 11 ℃/s of cold-rolling of steel plate temperature rise rate, production should be controlled the stove internal tension at 2.3MPa continuously;
E) rewinding packing: production should be controlled the stove internal tension at 17MPa;
The product electromagnetic performance: longitudinal P 15 is 2.41W/kg, and B5000 is 1.701T; Laterally P15 is 2.71W/kg, and B5000 is 1.680T, and iron loss transverse and longitudinal poor performance is 12.45%, and magnetic strength transverse and longitudinal poor performance is 1.23%.
Embodiment 2
The chemical component weight per-cent of embodiment of the invention electrical steel is: C:0.0015%, and Si:2.35%, Mn:0.23%, P:0.012%, S:0.0015%, Als:0.22%, 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 68%;
B) hot rolling and normalizing are processed: with heating steel billet to 1100 ℃, start rolling temperature is 1080 ℃, last percentage pass reduction 50% of roughing, and finishing temperature is 890 ℃, extreme trace time draft 18%, 23 seconds steel band incubation times, coiling temperature is 820 ℃; Hot rolling is processed by normalizing, and recrystallize all occurs deformed grains;
C) cold rolling: steel plate becomes 0.5mm thick through cold continuous rolling, and first is controlled at 37%.Steel plate width is 1020mm;
D) finished products: 23 ℃/s of cold-rolling of steel plate temperature rise rate, production should be controlled the stove internal tension at 1.4MPa continuously;
E) rewinding packing: production should be controlled the stove internal tension at 12MPa;
The product electromagnetic performance: longitudinal P 15 is 2.57W/kg, and B5000 is 1.697T; Laterally P15 is 2.64W/kg, and B5000 is 1.682T, and iron loss transverse and longitudinal poor performance is 2.7%, and magnetic strength transverse and longitudinal poor performance is 0.7%.
Claims (8)
1. high trade mark product improves the isotropic production method of electromagnetic performance in the non-oriented electrical steel, its original steel grade is single ferrite area design, 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＞50%; Hot rolling Heating temperature≤1250 ℃, roughing final pass draft is controlled at 30% ~ 60%, temperature is controlled at 900 ~ 1180 ℃, before the finish rolling base thick be 50mm to 15mm, start rolling temperature＞880 ℃, the inferior draft of extreme trace＞5%, finishing temperature＞800 ℃, roll 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. high trade mark product improves the isotropic production method of electromagnetic performance in the non-oriented electrical steel according to claim 1, and the content of harmful chemical component 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. high trade mark product improves the isotropic production method of electromagnetic performance in the non-oriented electrical steel according to claim 1, it is characterized in that described strand equiaxed grain structure＞60%.
4. high trade mark product improves the isotropic production method of 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＜1000 ℃, finish rolling start rolling temperature＞950 ℃, extreme trace time draft＞15%, finishing temperature＞880 ℃, roll post inoculation time＞20 second, coiling temperature＞730 ℃.
5. high trade mark product improves the isotropic production method of electromagnetic performance in the non-oriented electrical steel according to claim 1, it is characterized in that described cold rolling draft＞80%, the first passage＞35%.
6. high trade mark product improves the isotropic production method of electromagnetic performance in the non-oriented electrical steel according to claim 1, it is characterized in that temperature rise rate in the described heat treatment furnace＞15 ℃/s, stove internal tension＜4MPa.
7. high trade mark product improves the isotropic production method of electromagnetic performance in the non-oriented electrical steel according to claim 6, it is characterized in that described stove internal tension＜1.6MPa.
8. high trade mark product improves the isotropic production method of electromagnetic performance in the non-oriented electrical steel according to claim 1, it is characterized in that tension control is below 16MPa in the described rewinding production.
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| CN2012104080970A CN102912104A (en) | 2012-10-23 | 2012-10-23 | Production method for improving isotropy of electromagnetic performance of medium and high-grade products of non-oriented electrical steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104816135A (en) * | 2015-05-07 | 2015-08-05 | 马钢(集团)控股有限公司 | Electrical steel and manufacturing method thereof |
| 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 |
| CN110004280A (en) * | 2017-12-26 | 2019-07-12 | Posco公司 | The preparation method of non-oriented electromagnetic steel sheet |
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| CN1888112A (en) * | 2005-06-30 | 2007-01-03 | 宝山钢铁股份有限公司 | High magnetic induction and high grad non-orientation electrical steel and its making process |
| CN101139681A (en) * | 2007-10-26 | 2008-03-12 | 山西太钢不锈钢股份有限公司 | High grade cold rolling non-oriented silicon steel and method for manufacturing same |
| CN101275198A (en) * | 2007-03-27 | 2008-10-01 | 宝山钢铁股份有限公司 | Middle code non-oriented electrical steel with fine surface and manufacturing method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1888112A (en) * | 2005-06-30 | 2007-01-03 | 宝山钢铁股份有限公司 | High magnetic induction and high grad non-orientation electrical steel and its making process |
| CN101275198A (en) * | 2007-03-27 | 2008-10-01 | 宝山钢铁股份有限公司 | Middle code non-oriented electrical steel with fine surface and manufacturing method thereof |
| CN101139681A (en) * | 2007-10-26 | 2008-03-12 | 山西太钢不锈钢股份有限公司 | High grade cold rolling non-oriented silicon steel and method for manufacturing same |
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| 王良芳: "简述高牌号无取向硅钢的发展", 《第九届全国电工钢专业学术年会论文集》, 19 March 2007 (2007-03-19), pages 42 - 5 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104816135A (en) * | 2015-05-07 | 2015-08-05 | 马钢(集团)控股有限公司 | Electrical steel and manufacturing method thereof |
| 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 |
| CN110004280A (en) * | 2017-12-26 | 2019-07-12 | Posco公司 | The preparation method of non-oriented electromagnetic steel sheet |
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Application publication date: 20130206 |