CN101492786B - Method for producing non-oriented silicon steel - Google Patents
Method for producing non-oriented silicon steel Download PDFInfo
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- CN101492786B CN101492786B CN2008100566856A CN200810056685A CN101492786B CN 101492786 B CN101492786 B CN 101492786B CN 2008100566856 A CN2008100566856 A CN 2008100566856A CN 200810056685 A CN200810056685 A CN 200810056685A CN 101492786 B CN101492786 B CN 101492786B
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Abstract
The invention discloses a method for producing a non-oriented silicon steel, comprising the steps as follows: an electric furnace, a converter or a medium frequency induction furnace is used for smelting, and then continuous casting is carried out, when the silicon content is high the pulling rate is low; hot rolling is carried out; hot rolls processed by hot rolling are treated with heat preservation by covering, rust moving by acid cleaning and normalized heat treatment, and then are heated gradually and cooled, with the heat preservation period to be 1-3h; the steel rolls are processed by one-time cold rolling, degreasing or surface oil removing, and then the rolls are loosened to reduce tension; recrystallization annealing or decarbonization is carried out in a bell furnace with the annealing temperature ranging from 750 DEG C to 1150 DEG C and the heat preservation period to be 1-80h, oxygen protection is adopted during annealing and the dew point is less than or equal to 60 DEG C, subsequently, insulation coating is coated and hot stretch leveling is carried out. The invention simplifies the production procedure and process equipment, reduces the production difficulty, has wide range of silicon composition, carries out smelting like common steel without refining, adopts one-time cold rolling method, improves the pass percentage of grades and yield of non-oriented siliconsteel and reduces the production cost.
Description
Technical field
The invention belongs to metallurgical technology and material science, be specifically related to be used for the production method of the cold-rolled non-oriented silicon steel of electromagnetic equipment iron cores such as electric motor, generator.
Background technology
Along with energy-conservation and making heavy-duty motor, the needs of high efficiency motor, electromagnetic performance to non-oriented silicon steel sheet is had higher requirement, various countries' silicon sheet Plant is all being improved as possible, the raising of quality is by high temperature continuous annealing (temperature＞950～1100 ℃) and higher smelting purity, C is less than 30PPM, the scope of S, N, O etc. is respectively less than 10～20PPM, and higher alloy degree methods such as (Si+AL＞4%) reaches.And this apparatus and process complexity is invested very highly, requires very strict to smelting, continuous casting, hot rolling, cold rolling, decarburizing annealing coating etc.Up to the present, China's year needs nearly 500,000 tons of senior non orientating silicon steel, almost whole dependence on import.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of suitable silicon steel composition range wide, can carry out refining and adopt the once cold rolling method, has simplified the production method of the non orientating silicon steel of operation and processing unit.
Technical scheme of the present invention is achieved in that a kind of production method of non orientating silicon steel, this method comprises: a, carry out smelting procedure at electric furnace, converter or medium-frequency induction furnace, the composition of silicon steel calculates according to weight percent and also has during smelting: C 0.04, Si 0.20～3.5, Mn≤1.50, P≤0.15, S≤0.008, Als0.01～1.50, N 0.008;
B, will carry out continuous casting working procedure through the silicon steel after smelting, silicon content greatly then pulling rate is low;
C, will carry out hot-rolled process through the silicon steel behind the continuous casting working procedure;
D, will carry out covering insulation, acid pickling and rust removing and normalizing heat treatment step through the later hot rolled coil of hot rolling, the covering soaking time is not less than 1h, when the steel roll temperature after hot rolling is not higher than 200 ℃, and the hot rolled coil acid pickling and rust removing; Slowly heating, slowly cooling, soaking time is 1-3h;
E, the coil of strip after the normalizing thermal treatment is carried out the once cold rolling operation, the steel band after cold rolling is carried out degreasing or surface degreasing, and loose winding is to reduce tension force;
F, the steel band after will handling through described e operation carry out recrystallization annealing or decarburization in bell furnace, 750～1150 ℃ of annealing temperatures, and soaking time 1-80h, hydrogen shield is adopted in annealing, dew point≤60 ℃;
G, the coil of strip after will annealing is coated with insulating coating and thermal stretch is smooth.
In the described hot-rolled process, silicon weight percent number 〉=1.2%, continuously cast bloom will enter holding pit and be incubated, holding temperature 〉=150 ℃, silicon weight percent number＜1.2% o'clock, hot rolling Heating temperature≤1250 ℃.
In described continuous casting working procedure, silicon weight percent number 〉=3%, pulling rate≤0.02m/s.
The technique effect that the present invention produces is as follows: 1. the production method of using non orientating silicon steel of the present invention, can not need to carry out external refining, and electric rangette, size converter all can be produced greatly, be equivalent to smelt according to ordinary steel, composition to silicon steel does not have strict restriction, and the scope of application is wider.2. propose to produce with the method for above-mentioned bell-type annealing operation.Present method is adopted in evidence, has not only simplified production process, processing unit, has also reduced the production difficulty, and especially the composition range of silicon steel does not have strict restriction.3. because method of the present invention can not adopt refining procedure, only need to adopt the once cold rolling method, just greatly improved the trade mark qualification rate and the lumber recovery of non orientating silicon steel, thereby reduced production costs significantly.
Embodiment
The production method of non orientating silicon steel of the present invention, it is characterized in that, this method comprises: carry out smelting procedure at electric furnace, converter or medium-frequency induction furnace etc., the composition of silicon steel except main body Fe according to weight percent content is: C-0.04 during smelting, Si-0.20～3.5, Mn≤1.50, P≤0.15, S≤0.008, Als 0.01～1.50, N-0.008.Can not need to carry out external refining, and big electric rangette, size converter can produce all, be equivalent to smelt according to ordinary steel, the composition of silicon steel is not had strict restriction, the scope of application is wider.To carry out continuous casting working procedure through the silicon steel after smelting, silicon content greatly then pulling rate is low; As silicon weight percent number 〉=3%, pulling rate≤0.02m/.To carry out hot-rolled process through the silicon steel behind the continuous casting working procedure, in the hot-rolled process, silicon weight percent number 〉=1.2%, continuously cast bloom will enter holding pit and be incubated, holding temperature 〉=150 ℃, silicon weight percent number＜1.2%, hot rolling Heating temperature≤1250 ℃.(normalizing thermal treatment can be carried out before rust cleaning will to carry out covering insulation (being equivalent to normalizing thermal treatment), acid pickling and rust removing and normalizing heat treatment step through the later hot rolled coil of hot rolling; or carry out simultaneously) in hot rolled coil covering insulation; the covering soaking time is not less than 1h; when the steel roll temperature after hot rolling is not higher than 200 ℃; with the hot rolled coil acid pickling and rust removing; slowly heating, slowly cooling, soaking time is 1-3h.Coil of strip after the normalizing processing is carried out the once cold rolling operation, the steel band after cold rolling is carried out degreasing or surface degreasing, and send volume to reduce tension force; In bell furnace, carry out recrystallization annealing or decarburization through the steel band after the above-mentioned processing, annealing temperature 750-1150 ℃, soaking time 1-80h, hydrogen shield is adopted in annealing, dew point≤60 ℃.Coil of strip after the annealing is coated with insulating coating and thermal stretch is smooth.
The present invention is a basis cold rolling and hot rolled silicon steel knowhow for many years, proposes to produce with the method for above-mentioned bell-type annealing operation.This method is adopted in evidence, has not only simplified production process, has simplified processing unit, has also reduced the production difficulty, and especially the composition range of silicon steel does not have strict restriction.And, because method of the present invention can not adopt refining procedure, only need to adopt the once cold rolling method, just greatly improved the trade mark qualification rate and the lumber recovery of non orientating silicon steel, thereby reduced production costs significantly.As breathe out electricity and make the non-oriented silicon steel sheet test that the inventive method of 200000kW and 600000kW generator first Application is made, P
15/50≤ 2.9W/kg and P
15/50≤ 2.7W/kg, respond well.Low grade silicon steel is once rolling to be handled through this bell-type annealing, can improve 3-4 the trade mark, and Si content is that 1% DW expects W18, and the H20 of 1.5%Si expects to reach W 10 levels, and magnetic strength is also very high.
Claims (3)
1. the production method of a non orientating silicon steel is characterized in that, this method comprises:
A, carry out smelting procedure at electric furnace, converter or medium-frequency induction furnace, the composition of silicon steel calculates according to weight percent and also has during smelting: C 0.04, Si 0.20～3.5, Mn≤1.50, P≤0.15, S≤0.008, Als0.01～1.50, N 0.008;
B, will carry out continuous casting working procedure through the silicon steel after smelting, silicon content greatly then pulling rate is low;
C, will carry out hot-rolled process through the silicon steel behind the continuous casting working procedure;
D, will carry out covering insulation, acid pickling and rust removing and normalizing heat treatment step through the later hot rolled coil of hot rolling, the covering soaking time is not less than 1h, when the steel roll temperature after hot rolling is not higher than 200 ℃, and the hot rolled coil acid pickling and rust removing; Slowly heating, slowly cooling, soaking time is 1～3h;
E, the coil of strip after the normalizing thermal treatment is carried out the once cold rolling operation, the steel band after cold rolling is carried out degreasing or surface degreasing, and loose winding is to reduce tension force;
F, the steel band after will handling through described e operation carry out recrystallization annealing or decarburization in bell furnace, 750～1150 ℃ of annealing temperatures, and soaking time 1～80h, hydrogen shield is adopted in annealing, dew point≤60 ℃;
G, the annealed coil of strip is coated with insulating coating and thermal stretch is smooth.
2. the production method of non orientating silicon steel as claimed in claim 1 is characterized in that, in the described hot-rolled process, silicon weight percent number 〉=1.2%, continuously cast bloom will enter holding pit and be incubated, holding temperature 〉=150 ℃, silicon weight percent number＜1.2%, hot rolling Heating temperature≤1250 ℃.
3. the production method of non orientating silicon steel as claimed in claim 1 is characterized in that, in described continuous casting working procedure, and silicon weight percent number 〉=3%, pulling rate≤0.02m/s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100566856A CN101492786B (en) | 2008-01-23 | 2008-01-23 | Method for producing non-oriented silicon steel |
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| CN2008100566856A CN101492786B (en) | 2008-01-23 | 2008-01-23 | Method for producing non-oriented silicon steel |
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| CN101492786A CN101492786A (en) | 2009-07-29 |
| CN101492786B true CN101492786B (en) | 2010-08-25 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102199696A (en) * | 2010-03-25 | 2011-09-28 | 宁波宝新不锈钢有限公司 | Production method for preheating and insulating special alloy steel |
| CN102226230A (en) * | 2011-04-15 | 2011-10-26 | 广东盈泉钢制品有限公司 | Production method of carbon extra-deep drawing steel belt |
| CN103031425A (en) * | 2011-09-29 | 2013-04-10 | 鞍钢股份有限公司 | Method for producing non-oriented electrical steel coated semi-processed product |
| CN103882211B (en) * | 2012-12-21 | 2016-03-02 | 鞍钢股份有限公司 | The method for annealing of cold rolling non-oriented electrical steel strip |
| CN103103323A (en) * | 2013-01-21 | 2013-05-15 | 江苏沙钢集团有限公司 | Method for producing cold-billet silicon steel without adopting heat-preservation pit |
| CN104726763B (en) * | 2013-12-23 | 2017-04-12 | 鞍钢股份有限公司 | Hot rolling method of electrical steel |
| CN104531978B (en) * | 2015-01-09 | 2016-08-31 | 攀钢集团攀枝花钢铁研究院有限公司 | Non-orientation silicon steel heating means and modelling control method thereof |
| CN105483520A (en) * | 2015-12-10 | 2016-04-13 | 苏州爱盟机械有限公司 | Automotive part material |
| CN105568118B (en) * | 2015-12-24 | 2017-04-12 | 江油市丰威新材料有限责任公司 | Low-temperature and high-magnetic-strength oriented silicon steel production process |
| CN106048390B (en) * | 2016-07-18 | 2018-12-21 | 华南理工大学 | A kind of production method of thin slab continuous casting and rolling production non-oriented electrical steel 50W800 |
| CN106269873B (en) * | 2016-07-29 | 2018-01-05 | 安阳钢铁股份有限公司 | Utilize the method for holding pit and single heating furnace tandem rolling production hot-rolled orientation silicon steel |
| CN111719078B (en) * | 2019-03-19 | 2021-06-15 | 江苏集萃冶金技术研究院有限公司 | Production method of non-oriented silicon steel for eliminating corrugated defects |
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| US5676771A (en) * | 1993-09-29 | 1997-10-14 | Kawasaki Steel Corporation | Non-oriented silicon steel sheet and method |
| CN1743469A (en) * | 2005-09-23 | 2006-03-08 | 东北大学 | Method for manufacturing non-oriented silicon steel sheet |
| CN101069943A (en) * | 2006-05-12 | 2007-11-14 | 武汉分享科工贸有限公司 | Method for making orientation-free cold-rolled electric steel-board |
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- 2008-01-23 CN CN2008100566856A patent/CN101492786B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5676771A (en) * | 1993-09-29 | 1997-10-14 | Kawasaki Steel Corporation | Non-oriented silicon steel sheet and method |
| CN1743469A (en) * | 2005-09-23 | 2006-03-08 | 东北大学 | Method for manufacturing non-oriented silicon steel sheet |
| CN101069943A (en) * | 2006-05-12 | 2007-11-14 | 武汉分享科工贸有限公司 | Method for making orientation-free cold-rolled electric steel-board |
Non-Patent Citations (2)
| Title |
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| JP特开平7-179948A 1995.07.18 |
| JP特开平8-104923A 1996.04.23 |
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Assignee: Shandong Yuanda Board Industry Technology Co., Ltd. Assignor: Beijing Zhonggangmao Technology Development Co., Ltd. Contract record no.: 2010370000637 Denomination of invention: Method for producing non-oriented silicon steel for improving head and tail performance Granted publication date: 20100825 License type: Exclusive License Open date: 20090729 Record date: 20101227 |
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