CN104726761A - Production method of low-cost high-magnetic induction oriented silicon steel - Google Patents

Production method of low-cost high-magnetic induction oriented silicon steel Download PDF

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Publication number
CN104726761A
CN104726761A CN201310719205.0A CN201310719205A CN104726761A CN 104726761 A CN104726761 A CN 104726761A CN 201310719205 A CN201310719205 A CN 201310719205A CN 104726761 A CN104726761 A CN 104726761A
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China
Prior art keywords
temperature
annealing
rolling
oriented silicon
silicon steel
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Inventor
蒋奇武
王晓达
金文旭
游清雷
付勇军
张静
张海利
庞树芳
贾志伟
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1222—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1233—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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

Abstract

The invention discloses a manufacturing method of low-cost high-magnetic induction oriented silicon steel, which comprises the following steps: 1) smelting; 2) hot rolling; 3) normalizing; 4) cold rolling; 5) decarburizing annealing and MgO coating; 6) high-temperature annealing; and 7) hot stretching flattening annealing and insulation layer coating. The steel is composed of the following components in percentage by weight: 0.03-0.1% of C, 2.5-4.0% of Si, 0.01-0.3% of Mn, at most 0.020% of P, 0.01-0.05% of S, 0.01-0.1% of Als, 0.003-0.01% of N, and the balance of Fe and inevitable impurities. The method lowers the production cost. The magnetic properties can stably reach P1.7<=1.20W/kg and B8>=1.88T, and the maximum magnetic properties can reach P1.7<=1.10W/kg and B8>=1.88T.

Description

A kind of production method of low cost high magnetic induction grain-oriented silicon steel
Technical field
The present invention relates to a kind of manufacture method of oriented silicon steel, especially a kind of manufacture method of low cost height magnetic strength Fe-3%Si oriented silicon steel.
Background technology
The oriented silicon steel of silicon content 3% is the indispensable important meals functional materials of electric power, electronics and war industry, is also the high value added product that current iron and steel enterprise can be mass-produced.
Under normal circumstances, oriented silicon steel can be divided into GO steel and HiB steel by the difference of preparation technology and performance: GO steel adopts secondary cold-rolling method, 1.85 > B 8(magnetic strength)>=1.75T; HiB steel adopts once cold rolling method, B 8(magnetic strength)>=1.85T.GO steel technical process: hot metal pretreatment → smelting → external refining → continuous casting → hot rolling → (normalizing) pickling → once cold rolling → process annealing → secondary cold-rolling → decarburizing annealing and be coated with MgO → smooth annealing of high temperature annealing → thermal stretch and be coated with insulation layer → shearings packaging and put in storage.HiB steel technical process: hot metal pretreatment → smelting → external refining → continuous casting → hot rolling → normalizing pickling → cold rolling → decarburizing annealing and be coated with MgO → smooth annealing of high temperature annealing → thermal stretch and be coated with insulation layer → shearings packaging and put in storage.The Composition Design of HiB steel contains higher carbon content and adds the alloying elements such as Cu, Sn.
In sum, there is the high defect of cost in existing production high magnetic induction grain-oriented silicon steel.
Summary of the invention
The invention provides a kind of manufacture method of low cost high magnetic induction grain-oriented silicon steel; with the Composition Design of GO steel; select the operational path (HiB steel) of once cold rolling method, achieved a kind of production method of low cost high magnetic induction grain-oriented silicon steel by the matching relationship of adjustment normalizing, decarburizing annealing and high-temperature annealing process.
For achieving the above object, the present invention takes following technical scheme:
The present invention is based on the control techniques of goss texture ({ 110}<001>), by meeting the heritable Composition Design of goss texture, and at utmost form position completes production method from low cost high magnetic induction grain-oriented silicon steel to the technological design of accurate goss texture, main technique is as follows:
(1) smelting technology
Smelting requirements uses spiegel iron water, and hot metal composition is in table 1; After converter smelting and external refining, obtain the molten steel of table 2 design mix, its surplus is iron, and foreign matter content requires <0.0050%.Molten steel is cast for the heavy slab of 200 ~ 250mm when superheating temperature is less than 50 DEG C.
Table 1 hot metal composition (wt%)
C Si Mn P S The residual element such as Ni, Cr, Cu
＞3.5 0.30-0.60 ≤0.07 ≤0.080 ≤0.025 ≤0.005
Table 2 molten steel composition (wt%)
C Si Mn P S Als N Fe
0.03-0.1 2.5-4.0 0.01-0.3 ≤0.020 0.01-0.05 0.01-0.1 0.003-0.01 Surplus
(2) hot rolling technology
Slab adopts low-temperature heat can meet inhibitor solid solution, its temperature range is 1200 ~ 1300 DEG C, soaking time is 30 ~ 180min, roughing adopts the pattern of the first frame 3 passage and the second frame 3 passage, altogether rolling 6 passage, and workpiece thickness is 30-45mm, finish rolling breaking down temperature is 1000 ~ 1100 DEG C, finishing temperature is 850 ~ 950 DEG C, and coiling temperature is 500 ~ 600 DEG C, finally obtains the hot-rolled sheet of 1.8 ~ 2.3mm.
(3) normalizing process
The normalizing process of design is temperature 1050 ~ 1150 DEG C, and insulation 2 ~ 4.5min, air cooling temperature 850 ~ 1000 DEG C, Water spray temperature is 30-50 DEG C, and discharge is 100 ~ 300m 3/ h.Because in composition, carbon content is lower, the γ phase content generated in low-temperature heat course of hot rolling is less, and the MnS inhibitor quantity separated out after cooling is few, and the object controlling normalizing process is that the AlN inhibitor obtaining effective dimensions is separated out, and ensures enough restraints.
(4) cold-rolling process
Adopt Sendzimir twenty-high rolling mill to carry out cold rolling, total reduction is 84% ~ 88%.Adopt a cold rolling generation of heavy reduction rate more have 111}<112> position to deformation bands, between deformation bands in transitional zone { 110}<001> subgrain is more, during decarburizing annealing, by assembling formation position, to accurately, { the first crystal grain of 110}<001>, improves final magnetic property to subgrain.
(5) decarburizing annealing and painting MgO technique
Decarburizing annealing technique is decarburization temperature 800 ~ 850 DEG C, insulation 3 ~ 7min, and atmosphere is for containing 10% ~ 20%H 2with 90% ~ 80%N 2the protection gas of (volume fraction), humidification temperature 50 ~ 70 DEG C, after coating MgO coating, batches after 500 ~ 600 DEG C of drying and sintering.The object reducing decarburizing annealing temperature rise rate makes primary recrystallization uniform small grains, the motivating force that during increase high temperature annealing, subgrain is grown up.
(6) high-temperature annealing process
Design high-temperature annealing process be elder generation with 50 ~ 100 DEG C/h speed at N 2be raised to 600 ~ 650 DEG C under atmosphere, then contain 70 ~ 80%H 2with 30 ~ 20%N 2(volume fraction) protective atmosphere, at this temperature 5 ~ 10h, is raised to 1150 ~ 1200 DEG C with 25 ~ 50 DEG C/h speed afterwards, and in temperature-rise period, atmosphere is for containing 70 ~ 80%H 2with 30 ~ 20%N 2the protection gas of (volume fraction), adopts pure H when 1150 ~ 1200 DEG C 2protection, insulation 20 ~ 40h, drops to 800 DEG C with 50 DEG C/h afterwards, is as cold as < 300 DEG C comes out of the stove with stove.Improve the temperature rise rate before high temperature annealing Gauss crystal grain secondary recrystallization, the more late decomposition of AlN can be made, increase rejection ability, final formed accurate position to goss texture, improve product magnetic property.
(7) the smooth annealing of thermal stretch and painting insulation layer technique
Dry below 500 DEG C after being coated with insulation layer and anneal about 800 ~ 900 DEG C of stretching and leveling through 0.25% ~ 0.75% elongation.
Other alloying element is not added in present component design, and reduce production cost, finished product rate can improve more than 10%; Save process annealing and secondary cold-rolling two operations, ton steel is produced can shorten 0.1 hour; Magnetic property Absorbable organic halogens reaches P 1.7≤ 1.20W/kg, B 8>=1.88T, reaches as high as P 1.7≤ 1.10W/kg, B 8>=1.88T.
Embodiment
One, embodiment
1, technical process
Smelting → hot rolling → normalizing → cold rolling → decarburizing annealing and be coated with MgO → smooth annealing of high temperature annealing → thermal stretch and be coated with insulation layer → rewinding packaging
2, processing parameter
(1) smelt
Smelt 3 tank steel, composition is in table 3, and its surplus is iron, and foreign matter content requires <0.0050%.Molten steel is cast for the heavy slab of 230mm when superheating temperature is less than 50 DEG C.
Composition (wt%) smelted by table 3
Composition C Si Mn P S Als N
Composition 1 0.03 2.5 0.015 0.015 0.01 0.015 0.005
Composition 2 0.05 3.2 0.140 0.015 0.03 0.050 0.010
Composition 3 0.09 4.0 0.300 0.015 0.05 0.095 0.010
(2) hot rolling
Hot-rolled process parameter is in table 4.
Table 4 hot-rolled process parameter
(3) normalizing
Normalizing process parameter is in table 5.
Table 5 normalizing process parameter
Composition Temperature (DEG C) Soaking time (min) Air cooling temperature (DEG C) Temperature of cooling water (DEG C) Discharge (m 3/h）
Composition 1 1050 4.5 850 30 100
Composition 2 1100 3 950 40 280
Composition 3 1150 2 1000 50 300
(4) cold rolling
Cold-rolling process parameter is in table 6.
Table 6 cold-rolling process parameter
(5) decarburizing annealing and painting MgO
Decarburizing annealing and painting MgO processing parameter are in table 7.
Table 7 decarburizing annealing and painting MgO processing parameter
(6) high temperature annealing
High-temperature annealing process parameter is in table 8.
Table 8 high-temperature annealing process parameter
(7) the smooth annealing of thermal stretch and painting insulation layer
The smooth annealing process of thermal stretch is in table 9.
The smooth parameter and annealing of table 9 thermal stretch
Composition Temperature (DEG C) Elongation (%)
Composition 1 800 0.25
Composition 2 850 0.50
Composition 3 900 0.75
3, result of implementation
The magnetic property detected result that table 10 is the present invention's 3 kinds of composition embodiment and finished product rate.
Table 10 magnetic property and lumber recovery
Two, comparative example
1, technical process
Smelting → hot rolling → normalizing → once cold rolling → process annealing → secondary cold-rolling → decarburizing annealing and be coated with MgO → smooth annealing of high temperature annealing → thermal stretch and be coated with insulation layer → rewinding packaging
2, processing parameter
(1) hot rolling
The slab each 2 piece of choosing 3 kind compositions identical with embodiment carries out hot rolling.Slab heating temperature is 1280 DEG C, soaking time 120min, and roughing adopts the pattern of the first frame 3 passage and the second frame 3 passage, and entering final rolling temperature is 1050 DEG C, and finish rolling finishing temperature is 900 DEG C, and coiling temperature is 550 DEG C, the final hot-rolled sheet coil obtaining 2.0mm.
(2) normalizing
Normalizing process is temperature 1000 DEG C, and insulation 3min, air cooling to 900 DEG C, temperature of cooling water is 50 DEG C, and discharge is 80m 3/ h.
(3) once cold rolling
Once cold rolling adopts 2 passes, and total reduction is 68%(2.0mm → 0.64mm).(4) process annealing
Intermediate annealing process is temperature 900 DEG C, insulation 3min, and humidification temperature is 48 DEG C, and atmosphere is for containing 20%H 2and 80%N 2protection gas (volume fraction).
(5) secondary cold-rolling
Secondary cold-rolling adopts 3 passes, and total reduction is 55.5%(0.64mm → 0.285mm).
(6) decarburizing annealing and painting MgO
Decarburizing annealing technique is temperature 880 DEG C, insulation 5min, and atmosphere is for containing 20%H 2and 80%N 2the protection gas of (volume fraction), humidification temperature is 50 DEG C, after coating MgO coating, batches after 550 DEG C of drying and sintering.
(7) high temperature annealing
High-temperature annealing process be first with 80 DEG C/h speed at N 2650 DEG C are raised under atmosphere, then in atmosphere for containing 75%H 2and 25%N 2protection gas under be incubated 10h at such a temperature, be raised to 1200 DEG C with 20 DEG C/h speed afterwards, in temperature-rise period, protective atmosphere is for containing 75%H 2and 25%N 2atmosphere (volume fraction), at 1200 DEG C of pure H 2be incubated 30h under protective atmosphere, drop to 800 DEG C with 50 DEG C/h afterwards, be as cold as < 300 DEG C with stove and come out of the stove.
(8) the smooth annealing of thermal stretch and painting insulation layer
To be coated with after insulation layer oven dry 500 DEG C below and about 850 DEG C of smooth annealing of thermal stretch.
3, result of implementation
The magnetic property detected result that table 11 is the present invention's 3 kinds of composition comparative examples and finished product rate.
Table 11 magnetic property and lumber recovery
Three, comparing result
Can be found out by the contrast of table 10 and table 11, the magnetic property of all coil of strips of the present invention is all at P 1.7≤ 1.20W/kg, B 8>=more than 1.88T level, optimum reaches P 1. 7≤ 1.10W/kg, B 8>=1.88T level.And finished product rate of the present invention is 78%, improve 16% than 62% of comparative example.

Claims (3)

1. a manufacture method for low cost high magnetic induction grain-oriented silicon steel, is characterized in that comprising the steps: 1) smelting technology: molten steel is cast for the heavy slab of 200 ~ 250mm when superheating temperature is less than 50 DEG C; 2) hot rolling technology: slab adopts 1200 ~ 1300 DEG C of low-temperature heats, soaking time is 30 ~ 180min, after roughing, workpiece thickness is 30-45mm, finish rolling breaking down temperature is 1000 ~ 1100 DEG C, finishing temperature is 850 ~ 950 DEG C, coiling temperature is 500 ~ 600 DEG C, obtains the hot-rolled sheet of 1.8 ~ 2.3mm; 3) normalizing process: temperature 1050 ~ 1150 DEG C, insulation 2 ~ 4.5min, air cooling temperature 850 ~ 1000 DEG C, Water spray temperature is 30-50 DEG C, and discharge is 100 ~ 300m 3/ h; 4) cold-rolling process: total reduction is 84% ~ 88%; 5) decarburizing annealing and painting MgO technique: decarburization temperature 800 ~ 850 DEG C, insulation 3 ~ 7min, atmosphere is for containing volume percent 10% ~ 20%H 2with 90% ~ 80%N 2protection gas, humidification temperature 50 ~ 70 DEG C, after coating MgO coating, batches after 500 ~ 600 DEG C of drying and sintering; 6) high-temperature annealing process: first with 50 ~ 100 DEG C/h speed at N 2be raised to 600 ~ 650 DEG C under atmosphere, then contain volume percent 70 ~ 80%H 2with 30 ~ 20%N 2protective atmosphere, at this temperature 5 ~ 10h, is raised to 1150 ~ 1200 DEG C with 25 ~ 50 DEG C/h speed afterwards, and in temperature-rise period, atmosphere is for containing volume percent 70 ~ 80%H 2with 30 ~ 20%N 2protection gas, adopt pure H when 1150 ~ 1200 DEG C 2protection, insulation 20 ~ 40h, drops to 800 DEG C with 50 DEG C/h afterwards, is as cold as < 300 DEG C comes out of the stove with stove; 7) the smooth annealing of thermal stretch and painting insulation layer technique: dry below 500 DEG C after being coated with insulation layer and anneal about 800 ~ 900 DEG C of stretching and leveling through 0.25% ~ 0.75% elongation.
2. the manufacture method of low cost high magnetic induction grain-oriented silicon steel according to claim 1, it is characterized in that: the composition of described steel is C0.03-0.1 by weight percentage, Si2.5-4.0, Mn0.01-0.3, P≤0.020, S0.01-0.05, Als0.01-0.1, N0.003-0.01, surplus is Fe and inevitable impurity.
3. the manufacture method of low cost high magnetic induction grain-oriented silicon steel according to claim 1, is characterized in that: described roughing adopts the first frame 3 passage and the second frame 3 passage, altogether rolling 6 passage.
CN201310719205.0A 2013-12-23 2013-12-23 Production method of low-cost high-magnetic induction oriented silicon steel Pending CN104726761A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104988293A (en) * 2015-07-31 2015-10-21 国网智能电网研究院 Oriented electrical steel hot rolling method and oriented electrical steel prepared through method
CN107858494A (en) * 2017-11-23 2018-03-30 武汉钢铁有限公司 The production method of low temperature high magnetic induction grain-oriented silicon steel
CN109554525A (en) * 2018-12-03 2019-04-02 武汉钢铁有限公司 A kind of manufacturing method of mirror surface-oriented silicon steel
CN110791635A (en) * 2019-09-30 2020-02-14 鞍钢股份有限公司 Method for preparing high-magnetic-induction oriented silicon steel
CN113403463A (en) * 2021-05-25 2021-09-17 鞍钢股份有限公司 Production method for improving cold rolling processability of oriented silicon steel
CN115627313A (en) * 2022-09-22 2023-01-20 宁波钢铁有限公司 Oriented silicon steel hot rolled plate and production process thereof
CN115896596A (en) * 2022-11-15 2023-04-04 国网智能电网研究院有限公司 Ultrathin oriented silicon steel and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10245629A (en) * 1997-03-06 1998-09-14 Nippon Steel Corp Production of grain oriented silicon steel sheet excellent in magnetic property
CN102443736A (en) * 2010-09-30 2012-05-09 宝山钢铁股份有限公司 Method for producing high magnetic flux-density oriented silicon steel product
CN102560235A (en) * 2010-12-17 2012-07-11 鞍钢股份有限公司 Manufacturing method of high-magnetic-inductive oriented silicon steel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10245629A (en) * 1997-03-06 1998-09-14 Nippon Steel Corp Production of grain oriented silicon steel sheet excellent in magnetic property
CN102443736A (en) * 2010-09-30 2012-05-09 宝山钢铁股份有限公司 Method for producing high magnetic flux-density oriented silicon steel product
CN102560235A (en) * 2010-12-17 2012-07-11 鞍钢股份有限公司 Manufacturing method of high-magnetic-inductive oriented silicon steel

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104988293A (en) * 2015-07-31 2015-10-21 国网智能电网研究院 Oriented electrical steel hot rolling method and oriented electrical steel prepared through method
CN107858494A (en) * 2017-11-23 2018-03-30 武汉钢铁有限公司 The production method of low temperature high magnetic induction grain-oriented silicon steel
CN107858494B (en) * 2017-11-23 2019-07-16 武汉钢铁有限公司 The production method of low temperature high magnetic induction grain-oriented silicon steel
CN109554525A (en) * 2018-12-03 2019-04-02 武汉钢铁有限公司 A kind of manufacturing method of mirror surface-oriented silicon steel
CN110791635A (en) * 2019-09-30 2020-02-14 鞍钢股份有限公司 Method for preparing high-magnetic-induction oriented silicon steel
CN113403463A (en) * 2021-05-25 2021-09-17 鞍钢股份有限公司 Production method for improving cold rolling processability of oriented silicon steel
CN115627313A (en) * 2022-09-22 2023-01-20 宁波钢铁有限公司 Oriented silicon steel hot rolled plate and production process thereof
CN115896596A (en) * 2022-11-15 2023-04-04 国网智能电网研究院有限公司 Ultrathin oriented silicon steel and preparation method thereof
CN115896596B (en) * 2022-11-15 2023-09-08 国网智能电网研究院有限公司 Ultrathin oriented silicon steel and preparation method thereof

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