CN104438328A - Hot rolling method for improving non-oriented silicon steel magnetic performance - Google Patents
Hot rolling method for improving non-oriented silicon steel magnetic performance Download PDFInfo
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- CN104438328A CN104438328A CN201410694842.1A CN201410694842A CN104438328A CN 104438328 A CN104438328 A CN 104438328A CN 201410694842 A CN201410694842 A CN 201410694842A CN 104438328 A CN104438328 A CN 104438328A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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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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Abstract
The invention provides a hot rolling method for improving the non-oriented silicon steel magnetic performance. The hot rolling method comprises the steps that smelting and continuous casting for blank forming are carried out; a casting blank is divided into two sections and then heated, wherein the temperature rising time from the moment the cast blank enters a heating furnace to the moment the temperature rises to 950-1050 DEG C accounts for 80-90% of the total time for conventional heating, and then the time consumed when the temperature continues rising to 1100-1150 DEG C accounts for 10-20% of the total time for conventional heating; hot rolling is carried out, and follow-up working procedures are carried out conventionally. Existing equipment is utilized, the heating temperature of the casting blank is controlled to be no more than 1280 DEG C, B5000 of a steel plate can be larger than or equal to 1.7 T, and P1.5/50 of the steel plate is smaller than or equal to 2.3 W/kg.
Description
Technical field
The present invention relates to a kind of method that non-orientation silicon steel is produced, belong to a kind of hot-rolling method improving non-orientation silicon steel magnetic property particularly.
Background technology
Cold rolling non-oriented electrical steel is a kind of magnetically soft alloy material, and mainly for the manufacture of the iron core of motor and electrical equipment, and iron loss and magnetic strength are the leading indicators weighing its performance.Affect non-orientation silicon steel iron loss because have composition, crystal texture, impurity, field trash, internal stress, crystallite dimension, steel plate thickness etc.When composition, finished product thickness are certain, the state of precipitated phase and the control of texture just seem particular importance.At present, in traditional mode of production, the heating of strand adopts walking beam furnace more, it is four-part form heating, namely divide preheating section, the first bringing-up section, the second bringing-up section and soaking zone, soaking temperature controls at 1000 ~ 1200 DEG C, and each section of time basic difference is little, all at 50 ~ 80min, total time inside furnace compares and is about 270 ~ 340min; Finish rolling finishing temperature > 920 DEG C.By analysis, this heating process makes the sulfide in steel plate and nitride be easy to solid solution, decline because solid solubility reduces along with steel billet temperature in the hot rolling, separate out with small and dispersed shape again afterwards, in rear operation finished products process, be unfavorable for that grain growth makes finished product crystal grains fine, (111) texture component can be caused simultaneously to increase, finally make finished product magnetic degenerate.
Through retrieval, Chinese Patent Application No. is the document of 200310108197.2, discloses a kind of production method of producing orientation-free cold-rolled electrical sheet.Though it makes heating of plate blank to 900 ~ 1150 DEG C, finishing temperature is at 800 ~ 950 DEG C (its finishing temperature experimental example is all more than 800 DEG C), but it is applicable to the production line that casting limit, similar sheet billet limit is rolled, limit cast panel base thinner thickness, be 120 ~ 170mm, be not suitable for tradition steel-making at present, hot rolling line.
Chinese Patent Application No. is the document of 200810222024.6, it discloses a kind of manufacture method of producing the cold rolling non-oriented electrical steel of low-iron loss high-magnetic strength, it is characterized in that composition not containing Al or the low-carbon low-silicon electrical steel containing 0.005 ~ 0.60%Al, slab heating temperature is 900 ~ 1150 DEG C, and finishing temperature is 900 ~ 975 DEG C.Although document strand adopts low-temperature heat technology, but its chemical composition be suitable for is Si:1.0 ~ 2.0%, 0 ~ 0.60%Al, and 1.5%≤Si+3Al≤3.2%, Mn:0.01 ~ 0.40%, P :≤0.04%, S :≤0.01%, N :≤0.005%, O :≤0.025%, all the other are Fe and inevitable impurity, inaction mass percent.Be not suitable for the No yield point trade mark that Si and Al content is higher.
The applicant for can realize slab heating temperature be no more than 1200 DEG C be applicable to tradition steel-making, hot rolling line, the high grade non-oriented silicon steel that Si and Al content is higher can be produced, realize low-temperature heat and the further method for producing non-oriented silicon steel improving the magnetic property of steel plate simultaneously.Find through great many of experiments, by controlling the heating process of slab at hot-rolled process and controlling finish rolling open rolling and finishing temperature, the problems referred to above just can be made effectively to be solved, magnetic is further enhanced, thus meet the needs of electromechanical industries development.
Summary of the invention
The present invention is directed to the deficiency that prior art exists, one is provided to utilize existing equipment, at being no more than 1200 DEG C by the heating-up temperature controlling strand, the B5000 >=1.7T of steel plate can be improved again, the hot-rolling method of the raising non-orientation silicon steel magnetic property of P1.5/50≤2.3W/kg
Realize the measure of above-mentioned purpose:
Improve a hot-rolling method for non-orientation silicon steel magnetic property, its step:
1) smelting, continuous casting become base;
2) divide two sections to heat to strand, wherein: enter heating furnace from strand and account for 80 ~ 90% of conventional heating total time to the heating-up time being warming up to 950 ~ 1050 DEG C, then to continue to be warming up to 1100 ~ 1150 DEG C of times used be 10 ~ 20% of conventional heating total time;
3) carry out hot rolling: after conventional roughing, carry out finish rolling, and control finish rolling start rolling temperature at 880 ~ 950 DEG C, finish rolling finishing temperature is at 750 ~ 800 DEG C;
4) routine carries out rear operation.
It is characterized in that, its composition be suitable for and weight percent content are: C≤0.005%, Si:2.7 ~ 3.5%, Mn:0.1 ~ 1.0%, Al:0.6 ~ 1.5%, S≤0.002%, N≤0.003%, other is for Fe and be unavoidably mingled with, and thickness is the strand of 210 ~ 230mm.
Heating of plate blank adopts two-part to heat by the present invention, and namely steel plate is heated to 950 ~ 1050 DEG C by first paragraph, and the heat time in this stage accounts for 80 ~ 90% of conventional heating total time; Second segment is heated to 1100 ~ 1150 DEG C, and the time used in this stage is 10 ~ 20% of conventional heating total time.First paragraph humidity province is AlN, MnS Coarsening Temperature district, if heating-up temperature is lower than 950 DEG C, and time short then alligatoring weak effect.
To the explanation of finish-rolling process, why the present invention adopts Low Temperature Finish technique in the hot fine rolling stage, namely its start rolling temperature is controlled lower than 950 DEG C, finish rolling finishing temperature is for being less than 800 DEG C to 750 DEG C, be owing to finding in test, adopt Low Temperature Finish favourable to increase (100) and (110) texture; 950 DEG C are greater than and finishing temperature is greater than 800 DEG C, to increase (100) and (110) texture declines as start rolling temperature.
The present invention compared with prior art, utilizes existing equipment, at controlling to be no more than 1280 DEG C to the heating-up temperature of strand, can make again the B5000 >=1.7T of steel plate, P1.5/50≤2.3W/kg.
Detailed description of the invention
Below the present invention is described in detail:
Table 1 is the chemical component table of various embodiments of the present invention and comparative example;
Table 2 is main technologic parameters and the magnetic property list of various embodiments of the present invention and comparative example.
Various embodiments of the present invention are produced according to following steps:
1) smelting, continuous casting become base;
2) divide two sections to heat to strand, wherein: enter heating furnace from strand and account for 80 ~ 90% of conventional heating total time to the heating-up time being warming up to 950 ~ 1050 DEG C, then to continue to be warming up to 1100 ~ 1150 DEG C of times used be 10 ~ 20% of conventional heating total time;
3) carry out hot rolling: after conventional roughing, carry out finish rolling, and control finish rolling start rolling temperature at 880 ~ 950 DEG C, finish rolling finishing temperature is at 750 ~ 800 DEG C;
4) routine carries out rear operation.
The component list (%wt) of table 1 various embodiments of the present invention and comparative example
The main technologic parameters of table 2 various embodiments of the present invention and comparative example and magnetic property list
As can be seen from Table 2, embodiment 1 ~ 7 adopts technique of the present invention, slab stops the heat time of 80 ~ 90% 950 ~ 1050 DEG C of sections, the heat time of 10 ~ 20% is stopped at 1100 ~ 1150 DEG C of temperature sections, product magnetic property is better than comparative example, comparative example also adopts identical heating-up temperature, but two sections of heat time differences.Comparative example 3 is conventional four sections of heating processes, each section of time equalization, and finishing temperature is too high, and finished product magnetic property is poor relative to the inventive method.
This detailed description of the invention is only the best and exemplifies, the restricted enforcement not to technical solution of the present invention.
Claims (2)
1. improve a hot-rolling method for non-orientation silicon steel magnetic property, its step:
1) smelting, continuous casting become base;
2) divide two sections to heat to strand, wherein: enter heating furnace from strand and account for 80 ~ 90% of conventional heating total time to the heating-up time being warming up to 950 ~ 1050 DEG C, then to continue to be warming up to 1100 ~ 1150 DEG C of times used be 10 ~ 20% of conventional heating total time;
3) carry out hot rolling: after conventional roughing, carry out finish rolling, and control finish rolling start rolling temperature at 880 ~ 950 DEG C, finish rolling finishing temperature is at 750 ~ 800 DEG C;
4) routine carries out rear operation.
2. a kind of hot-rolling method improving non-orientation silicon steel magnetic property as claimed in claim 1, it is characterized in that, its composition be suitable for and weight percent content are: C≤0.005%, Si:2.7 ~ 3.5%, Mn:0.1 ~ 1.0%, Al:0.5 ~ 1.5%, S≤0.002%, N≤0.003%, other is for Fe and be unavoidably mingled with, and thickness is the strand of 210 ~ 230mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410694842.1A CN104438328B (en) | 2014-11-27 | 2014-11-27 | A kind of hot-rolling method improving non-orientation silicon steel magnetic property |
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| CN201410694842.1A CN104438328B (en) | 2014-11-27 | 2014-11-27 | A kind of hot-rolling method improving non-orientation silicon steel magnetic property |
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| CN104438328A true CN104438328A (en) | 2015-03-25 |
| CN104438328B CN104438328B (en) | 2016-08-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048208A (en) * | 2016-08-12 | 2016-10-26 | 武汉钢铁股份有限公司 | Fe-Mn austenite non-magnetic steel forging method |
| CN113195769A (en) * | 2018-09-27 | 2021-07-30 | Posco公司 | Non-oriented electrical steel sheet and method for manufacturing the same |
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| JPS5823411A (en) * | 1981-08-05 | 1983-02-12 | Nippon Steel Corp | Nondirectional electromagnetic steel plate having superior magnetism and manufacture therefor |
| EP0413306A1 (en) * | 1989-08-18 | 1991-02-20 | Nippon Steel Corporation | Method of producing non-oriented magnetic steel plate having high magnetic flux density |
| JP2002363713A (en) * | 2001-06-01 | 2002-12-18 | Nippon Steel Corp | Semiprocess nonoriented silicon steel sheet having extremely excellent core loss and magnetic flux density and production method therefor |
| CN101358272A (en) * | 2008-09-05 | 2009-02-04 | 首钢总公司 | Method for preparing high grade non-oriented electrical steel adding rare earth cerium |
| CN101358317A (en) * | 2008-09-05 | 2009-02-04 | 首钢总公司 | Method for preparing high silicium calcareous non-oriented electrical steel |
| CN101748263A (en) * | 2008-12-12 | 2010-06-23 | 鞍钢股份有限公司 | Method for heating directional silicon steel slab |
| 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 |
| CN102776346A (en) * | 2012-07-06 | 2012-11-14 | 河北钢铁股份有限公司邯郸分公司 | Hot rolling method for producing non-oriented electrical steel by continuously casting and rolling non-traditional sheet blank |
| CN102925793A (en) * | 2012-11-27 | 2013-02-13 | 武汉钢铁(集团)公司 | Non-oriented electrical steel with magnetic induction greater than or equal to 1.8 T and production method thereof |
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2014
- 2014-11-27 CN CN201410694842.1A patent/CN104438328B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5823411A (en) * | 1981-08-05 | 1983-02-12 | Nippon Steel Corp | Nondirectional electromagnetic steel plate having superior magnetism and manufacture therefor |
| EP0413306A1 (en) * | 1989-08-18 | 1991-02-20 | Nippon Steel Corporation | Method of producing non-oriented magnetic steel plate having high magnetic flux density |
| JP2002363713A (en) * | 2001-06-01 | 2002-12-18 | Nippon Steel Corp | Semiprocess nonoriented silicon steel sheet having extremely excellent core loss and magnetic flux density and production method therefor |
| CN101358272A (en) * | 2008-09-05 | 2009-02-04 | 首钢总公司 | Method for preparing high grade non-oriented electrical steel adding rare earth cerium |
| CN101358317A (en) * | 2008-09-05 | 2009-02-04 | 首钢总公司 | Method for preparing high silicium calcareous non-oriented electrical steel |
| CN101748263A (en) * | 2008-12-12 | 2010-06-23 | 鞍钢股份有限公司 | Method for heating directional silicon steel slab |
| 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 |
| CN102776346A (en) * | 2012-07-06 | 2012-11-14 | 河北钢铁股份有限公司邯郸分公司 | Hot rolling method for producing non-oriented electrical steel by continuously casting and rolling non-traditional sheet blank |
| CN102925793A (en) * | 2012-11-27 | 2013-02-13 | 武汉钢铁(集团)公司 | Non-oriented electrical steel with magnetic induction greater than or equal to 1.8 T and production method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048208A (en) * | 2016-08-12 | 2016-10-26 | 武汉钢铁股份有限公司 | Fe-Mn austenite non-magnetic steel forging method |
| CN113195769A (en) * | 2018-09-27 | 2021-07-30 | Posco公司 | Non-oriented electrical steel sheet and method for manufacturing the same |
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| CN104438328B (en) | 2016-08-24 |
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Effective date of registration: 20170711 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: WUHAN IRON AND STEEL Co.,Ltd. Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: WUHAN IRON AND STEEL (GROUP) Corp. |
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