CN102330021A - Full production process of low-temperature oriented silicon steel - Google Patents
Full production process of low-temperature oriented silicon steel Download PDFInfo
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- CN102330021A CN102330021A CN201110273632A CN201110273632A CN102330021A CN 102330021 A CN102330021 A CN 102330021A CN 201110273632 A CN201110273632 A CN 201110273632A CN 201110273632 A CN201110273632 A CN 201110273632A CN 102330021 A CN102330021 A CN 102330021A
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 77
- 238000000137 annealing Methods 0.000 claims abstract description 65
- 229910052742 iron Inorganic materials 0.000 claims abstract description 37
- 238000005097 cold rolling Methods 0.000 claims abstract description 35
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- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 238000005098 hot rolling Methods 0.000 claims abstract description 12
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- 229910000831 Steel Inorganic materials 0.000 claims description 154
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- 239000002893 slag Substances 0.000 claims description 38
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- 239000000203 mixture Substances 0.000 claims description 34
- 238000005096 rolling process Methods 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 24
- 238000005516 engineering process Methods 0.000 claims description 22
- 229910052802 copper Inorganic materials 0.000 claims description 21
- 239000011572 manganese Substances 0.000 claims description 20
- 238000005266 casting Methods 0.000 claims description 18
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 17
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 17
- 239000004571 lime Substances 0.000 claims description 17
- 239000003513 alkali Substances 0.000 claims description 16
- 229910052717 sulfur Inorganic materials 0.000 claims description 16
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 14
- 229910052698 phosphorus Inorganic materials 0.000 claims description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 13
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 12
- 238000005238 degreasing Methods 0.000 claims description 12
- 238000005554 pickling Methods 0.000 claims description 12
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 11
- 238000005261 decarburization Methods 0.000 claims description 11
- 239000010436 fluorite Substances 0.000 claims description 11
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 10
- 239000004411 aluminium Substances 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 9
- 229910052748 manganese Inorganic materials 0.000 claims description 9
- 229910052758 niobium Inorganic materials 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 9
- 229910052719 titanium Inorganic materials 0.000 claims description 9
- 229910052720 vanadium Inorganic materials 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 7
- GOPYZMJAIPBUGX-UHFFFAOYSA-N [O-2].[O-2].[Mn+4] Chemical group [O-2].[O-2].[Mn+4] GOPYZMJAIPBUGX-UHFFFAOYSA-N 0.000 claims description 6
- 238000005275 alloying Methods 0.000 claims description 6
- 238000003763 carbonization Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 239000010459 dolomite Substances 0.000 claims description 6
- 229910000514 dolomite Inorganic materials 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 229910052726 zirconium Inorganic materials 0.000 claims description 6
- 229910002551 Fe-Mn Inorganic materials 0.000 claims description 5
- 229910017082 Fe-Si Inorganic materials 0.000 claims description 5
- 229910017133 Fe—Si Inorganic materials 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 230000002950 deficient Effects 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract 1
- 239000000395 magnesium oxide Substances 0.000 abstract 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 abstract 1
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Abstract
The invention provides a full production process of a low-temperature oriented silicon steel, relates to the technical field of metallurgy, and aims at solving the technical problems of high slab heating temperature, short service life of a heating furnace, energy waste, low converter smelting designation hit rate of the oriented silicon steel due to narrow range of requirements on C and other chemical element contents, and the like of traditional cold-rolled oriented silicon steel. The full production process of the low-temperature oriented silicon steel comprises the following steps: molten iron pre-treatment, converter treatment, RH (Ruhrstahl-Heraeus) vacuum treatment, slab continuous casting, hot charging and hot delivery, slab heating, hot rolling, primary cold rolling, primary decarbonization and annealing, secondary cold rolling, low-temperature recovery annealing and magnesium oxide coating, high-temperature cover furnace annealing, stretching and insulating layer coating, as well as slitting, packaging and storing to finally produce the low-temperature oriented silicon steel.
Description
Technical field
The present invention relates to metallurgical technology field, the full technology of particularly a kind of low temperature cold-rolled orientation silicon steel production.
Background technology
Oriented silicon steel is a main raw material of making power equipments such as X-former, mutual inductor.The loss of the electric energy of power system is very big, and wherein the power transformer loss accounts for 20～25% of power system loss.And the loss of middle small transformers accounts for 40～50% of power system transformer loss.Improve the magnetic strength and reduction iron loss of low-temperature oriented silicon steel, not only can reduce the loss and the save energy of X-former, and the iron core section is dwindled, volume of transformer reduces, and weight saving has significantly reduced the X-former cost of manufacture simultaneously.
Oriented silicon steel has magnetic strength height, advantage that iron loss is low; The transformer loss that can reduce significantly with the X-former of its making; Have better energy-saving effect, but the production cycle of oriented silicon steel is long, production technique and complex equipments, chemical Composition Control is tight, influence factor is many.Therefore, oriented silicon steel is one of high value added product that scientific and technical content is high in the metallurgy industry.
The oriented silicon steel of domestic production is owing to be that to select MnS, AlN for use be main as suppressor factor, and the effect of suppressor factor is to utilize " solid solution-separate out " principle, promptly when high temperature with the solid solution of macrobead MnS, AlN, in course of hot rolling, separate out tiny uniform AlN, MnS.Because the effect in that tiny, the uniform AlN that separates out on the crystal boundary and MnS play pinning on crystal boundary has suppressed grain growth one time, (110) (001) subgrain is grown up, so just can become the ideal oriented silicon steel at last.The solid solubility temperature of suppressor factor has determined the Heating temperature of slab, and adopting AlN, MnS is that main slab heating temperature as suppressor factor is 1330～1350 ℃.The Heating temperature height has a strong impact on the work-ing life of process furnace, and energy dissipation is big, production cost is high.These factors have all greatly restricted the development of China's oriented silicon steel.
At present, no matter the cold rolled silicon steel that company of Japanese Nippon Steel and Kawasaki Steel company produce is in quality product, or aspects such as new technology and new product development, all is in rank first.Company of Nippon Steel is that employing is that main suppressor factor and heavy reduction rate once cold rolling method produced high magnetic strength, hanged down the Hi-B steel series product of iron loss with AlN.Kawasaki Steel company adopts with MnSe+Sb suppressor factor and twice cold-rolling practice production technology to produce high magnetic strength, hang down the RGH steel series product of iron loss.China's the fifties in last century oriented silicon steel that just begins one's study, but because production technology does not pass a test, product lumber recovery and qualification rate be low to reach reason such as production cost height, has limited the development of oriented silicon steel.Wuhan Iron & Steel (Group) Corp. had introduced cold rolled silicon steel manufacturing equipment and patent from Japanese Nippon Steel in 1974, formal orientation and the non orientating silicon steel of producing 11 trades mark in 1979.Through digestion, the absorption of decades, the technology be greatly improved qualitatively, promoted the fast development of China's oriented silicon steel.But along with the fast development of Chinese national economy, EPS is obviously not enough.Generating capacity is constantly increasing, and the generating total volume has surpassed 6.1 hundred million kW, needs oriented silicon steel more than 1,500,000 tons every year on average, and China has become one of maximum consumption market of world's oriented silicon steel at present.The amount of domestic production oriented silicon steel has satisfied not demand, and needs the import oriented silicon steel.
The oriented silicon steel production technology has limited the operation of many iron and steel enterprises owing to reasons such as production technique and complex equipments, production cost height, technical threshold height and has expanded production.Its major cause is: (1) selects that suppressor factor is comparatively single for use, the solid solubility temperature of suppressor factor is high, and the Heating temperature of slab need be heated to 1330～1350 ℃ when producing hot rolled coil, causes the process furnace of many iron and steel enterprises can not reach temperature requirement; (2) because the Chemical Composition narrow range that oriented silicon steel requires can not reach requirement during smelting, cause oriented silicon steel trade mark hit rate low; (3) production process is many, the production cycle is long, complex equipments, influence factor are many, can't guarantee quality product; (4) production cost is high.
Summary of the invention
The hot rolling slab Heating temperature that the present invention is intended to solve tradition directed silicon steel is high, the process furnace life-span is low, energy dissipation, oriented silicon steel C and technical problem such as other Chemical Composition claimed range is narrow, converter smelting trade mark hit rate is low, has to provide that Heating temperature is low, the process furnace life-span long, converter smelting shoots straight, the production technique full technology of low-temperature oriented silicon steel production of simple (decarburizing annealing), advantage such as production cost is low, the finished product magnetic property is better relatively.
The objective of the invention is to realize through following technical scheme.
The full technology of low-temperature oriented silicon steel production of the present invention comprises the steps:
A) hot metal pretreatment adds converter smelting with Fe-Si alloy, Fe-Mn alloy, steel scrap, quickened lime, fluorite and rhombspar, and S content in the molten iron is taken off to≤0.005 weight %; Wherein the C content of Fe-Si alloy≤0.10 weight %, S content≤0.050 weight %, P content≤0.050 weight %, Cr content≤0.10 weight %, Ti content≤0.030 weight %, V content≤0.030 weight %, Nb content≤0.030 weight %, Zr content≤0.020 weight %; The C content of Fe-Mn alloy≤0.10 weight %, S content≤0.020 weight %, P content≤0.10 weight %; The C content of steel scrap≤0.20 weight %, S content≤0.020 weight %, P content≤0.020 weight %, Cr content≤0.10 weight %, Ti content≤0.050 weight %, V content≤0.050 weight %, Nb content≤0.050 weight %; The S content of quickened lime≤0.030 weight %; The S content of fluorite≤0.10 weight %; The S content of rhombspar≤0.020 weight %;
B) above-mentioned pretreated molten iron and steel scrap are added the compound blow converter in the end, top by weight 9:1; In aforementioned compound per ton, add quickened lime 40～50Kg, light dolomite 15～20kg, Natural manganese dioxide ball 1.5～1.9Kg, fluorite 2～3kg and iron scale 1.5～2.5kg and carry out slag making; And control basicity of slag R is 4.0～4.5; After carrying out dephosphorization treatment, adopt once blowing to make the composition of endpoint molten steel satisfy following the requirement: C < 0.04 weight %, Mn < 0.015 weight %, P < 0.010 weight %, S < 0.010 weight %, O < 1000 weight PPm; Tapping temperature is 1650～1660 ℃;
C) carry out deoxidation in the aluminium that adds 8Kg * steel water oxygen weight % ratio in the molten steel per ton in the tapping process; And according to desired Chemical Composition of low-temperature oriented silicon steel and sampling analysis result; In tapping process, add copper, ferrosilicon and ferromanganese and carry out alloying, add copper, ferrosilicon and ferromanganese before the tap to 70%, add 20～30Kg lime by molten steel per ton simultaneously and prevent the molten steel rephosphorization; Before tapping finishes; Carry out pushing off the slag with slag stop cone or slag-blocking ball at tap hole, thickness of slag layer is less than 80mm in the controlling tank, and the molten steel after the tapping gets into ladle; Carry out Argon in the tapping process, tapping stopped Argon after 3 minutes;
D) ladle is sent into the RH vacuum oven and carry out vacuum-treat, the control liquid steel temperature was 1630～1650 ℃ when vacuum-treat began, and control vacuum tightness is carried out deoxidation less than 50Pa, vacuum processing time 20～25 minutes; After the vacuum-treat, carry out the composition fine setting according to sampling analysis result and the desired Chemical Composition adding of low-temperature oriented silicon steel copper, ferrosilicon, ferromanganese, silicon nitride and aluminium etc., make the Chemical Composition of molten steel satisfy following the requirement: C content is 0.025～0.055 weight %; Si content is 2.9～3.3 weight %; Mn content is 0.15～0.25 weight %; Cu content is 0.45～0.63 weight %; P content≤0.015 weight %; S content is 0.07～0.018 weight %; Als content is 0.008～0.032 weight %; N content is 50～130 weight PPm; O content≤20 weight PPm; Temperature is 1575～1590 ℃ after the vacuum-treat;
E) ladle after the vacuum-treat is winched on the continuous casting platform cast, adopt automatic casting apparatus to open to water in the casting cycle and water with long nozzle protection; The insulating covering agent that covering slag that mold uses and tundish use all adopts little carbon or carbon-free type;
F) the control superheating temperature is that 20～30 ℃, pulling rate are 0.7～0.9m/min, and the ratio of the controlled chilling water yield and molten steel amount is that 1.15～1.25L/kg casts;
G) steel billet that casting is obtained is delivered in the process furnace, and charging temperature is greater than 550 ℃; Heating temperature is 1270～1300 ℃, stove heat-up time greater than 3 hours; Then steel billet is carried out roughing, 1100～1200 ℃ of roughing temperature, draft is more than or equal to 80%; Roughing is carried out finish rolling after accomplishing, and 900～1080 ℃ of final rolling temperatures, draft are rolled into 2.2-2.5mm steel band more than or equal to 90%; Through laminar flow cooling steel band being cooled to temperature is 550～600 ℃ and batches;
H) steel band after the aforementioned hot rolling is removed the iron scale of steel strip surface through ball blast, pickling;
I) after the coil of strip preheating after the pickling, utilize twenty-high rolling mill to carry out once cold rolling;
J) coil of strip after the once cold rolling is delivered to continuous decarburizing annealing unit; First NaOH solution with 3～5% carries out the alkali cleaning degreasing after the uncoiling, cleans through water again, and is dry through hot-air drier afterwards; Get into decarburization annealing furnace and carry out carbonization treatment, furnace atmosphere is N
2, H
2, H
2O, annealing temperature is 820～850 ℃, steel band passes through decarburization annealing furnace with the speed of 6～15m/min, realizes a decarburization;
K) steel band after the decarburizing annealing utilizes twenty-high rolling mill to carry out secondary cold-rolling again, is rolled down to the desired gauge of product;
L) coil of strip behind the secondary cold-rolling carries out uncoiling and carries out the alkali cleaning degreasing with 3～5% NaOH solution at the Natural manganese dioxide unit, cleans through water again, and is dry through hot-air drier afterwards, and the entering lehre carries out low-temperature annealing, and furnace atmosphere is N
2, H
2, H
2O, the annealing back applies one deck MgO in steel strip surface, after the stoving oven oven dry, batches rolling;
M) applied coil of strip behind the MgO and delivered to and carry out high temperature annealing in the high temperature bell furnace, furnace atmosphere is N
2, H
2, 1150-1200 ℃ of annealing temperatures, soaking time are 20～24 hours;
N) coil of strip that the high temperature bell furnace is come out cleans and applies insulation layer at stretching coating unit, and oven dry and annealed stove are annealed and stretching and leveling then, and furnace atmosphere is N
2, H
2, temperature is 800～850 ℃ in the stove;
O) with coil of strip after the stretching coating shear remove defective after, the packing warehouse-in becomes the finished product.
The beneficial effect of the full technology of the low-temperature oriented silicon steel production of the present invention:
1. Cu
2 The solid solubility temperature of S is 1200～1250 ℃, and the solid solubility temperature of AlN is 1280 ℃, and the solid solubility temperature of MnS is 1315～1320 ℃, (Mn, Cu)
2The solid solubility temperature of S is 1250 ℃; Oriented silicon steel add that Cu forms (Mn, Cu)
2The solid solubility temperature of S composite inhibitor is all lower, can reduce the Heating temperature of slab at process furnace, reduces about 30-50 ℃ of temperature; Simultaneously can reduce the oxidization burning loss about 1.5% of silicon steel, and improve lumber recovery with energy-saving and cost-reducing the work-ing life that can improve process furnace.
2. after in steel, adding Cu, and the tiny and uniform that on crystal boundary, forms (Mn, Cu)
2S and Cu
2 The S particle has played pinning effect on crystal boundary, suppressed grain growth one time.On crystal boundary, also have the AlN suppressor factor simultaneously, (Mn, Cu)
2S and Cu
2 The compound action of S and AlN makes grain growth ability of inhibition obtain reinforcement, and (110) (001) crystal grain carries out the selectivity grain growth to accurately to help the position.Cu is the element that enlarges γ-phase region in addition, helps improving Si and Als content in the oriented silicon steel, can improve magnetic strength and reduce iron loss.
3. oriented silicon steel belongs to the Ultra-low carbon Clean Steel because C content composition narrow range is 0.02～0.035%.Converter smelting is controlled at C content at 0.030% o'clock, also is the limit of converter smelting.In addition, because the C that contains in the refractory materials that raw material that adds in the steelmaking process and auxiliary material and Sheng molten steel are used can make steel carburetting in various degree.Therefore, C content is difficult to satisfy the requirement of ingredient standard, and the converter smelting hit rate is low, causes production cost to increase considerably; If C content composition scope is relaxed, reduced the converter smelting difficulty, can improve the hit rate of converter smelting.Through relaxing C content composition scope method, make the hit rate of converter smelting reach 100%.In addition, during the converter smelting oriented silicon steel, if C content is low, O content is just high in the steel, and Al reductor consumption is big, increases cost.In addition, the Al of Al and O reaction generation
2O
3Fusing point is high, than great, be difficult to come-up, Al
2O
3Be trapped in the steel very big to magnetic property harm.Improve C content, can reduce the O content in the steel, can reduce production costs and reduce Al
2O
3Influence to magnetic property.
4. C favourable one side in oriented silicon steel also has disadvantageous one side.C separates out small and dispersed Fe in hot-rolled sheet
3C, it can hinder first grain growth.Can improve heat, cold-forming property, prevent that hot-rolled sheet from producing transverse fissure.In addition, the γ-phase amount that produces when C makes hot rolling increases, and guaranteeing that γ-phase amount is at 20～30% o'clock, can make the hot-rolled sheet structure refinement.But Fe
3C is very harmful to the magnetic property of steel, and the influence of magnetic aging is arranged.At (or between once cold rolling and secondary cold-rolling) after the once cold rolling, carry out in the decarburizing annealing decarburizing annealing C is removed.Decarburizing annealing is according to the original C content of every stove steel, and the travelling speed of adjustment steel plate can make C content satisfy standard-required, and is simple.
5. adopt AlN+ (Mn, Cu)
2S+Cu
2 S is that composite inhibitor is produced oriented silicon steel, can adopt decarburizing annealing and secondary cold-rolling to accomplish, and has the production efficiency height, the advantage that production cost is low.
Embodiment
Application principle of the present invention, effect and effect are explained through following embodiment.
Embodiment 1
The full technology of low-temperature oriented silicon steel production of the present invention comprises the steps:
A) pre-treatment of molten iron elder generation takes off S content in the molten iron to≤0.005%;
B) be in the molten iron and high-quality steel scrap (steel of steel scrap) adding converter of 9:1 with weight ratio after the pre-treatment for not using and utilize.Converter smelting adopts the compound blow converter in the end, top, and employing in batches, repeatedly adds starting material such as quickened lime, light dolomite, Natural manganese dioxide ball, fluorite and iron scale and carries out slag making, and control slag alkali degree (R) >=4.0, carries out dephosphorization.Make terminal point composition and tapping temperature satisfy following the requirement: C < 0.05%; Mn < 0.015%; P < 0.010%; S < 0.010%; O < 1000PPm; Tapping temperature is 1650～1660 ℃;
C) aluminium in molten steel adding 8Kg * steel water oxygen weight % ratio per ton carries out deoxidation in the tapping process, adds copper, ferrosilicon and ferromanganese again while tapping; The amount that adds copper, ferrosilicon and ferromanganese is that the composition according to steel-making requires and the weight of refining one heat steel proportionally calculates.Be that composition scope Cu content is 0.45～0.63 weight %, Si content is 2.9～3.3 weight %; Mn content is 0.15～0.25 weight %, will add copper, ferrosilicon and ferromanganese before the tap to 70%, carries out alloying, adds 20～30Kg/t lime simultaneously and prevents the molten steel rephosphorization.Before tapping finishes, carry out pushing off the slag with slag stop cone (ball) at tap hole, thickness of slag layer is less than 80mm in the controlling tank, and the molten steel after the tapping gets into ladle; In order to make the favourable come-up of deoxidation products, carry out Argon in the tapping process, stop Argon behind the tapping 3min;
D) ladle is transported to RH vacuum oven station and carries out vacuum-treat, it is 1630～1650 ℃ that vacuum begins molten steel temperature, and control vacuum tightness is carried out deoxidation less than 50Pa, vacuum processing time 20～25 minutes; Take a sample after the vacuum-treat; Result and the desired scope of composition like sampling analysis there are differences; Then desired scope of result, composition and the molten steel total weight according to sampling analysis draws the element wt that needs add; Carry out trimming through adding a spot of copper, ferrosilicon, ferromanganese, silicon nitride and aluminium etc., make the chemical ingredients of steel satisfy the desired scope of composition, promptly C content is 0.050%; Si content is 3.18%; Mn content is 0.18%; Cu content is 0.48%; P content is 0.010%; S content is 0.007%; Als content is 0.028%; N content is 83PPm; O content is 19PPm; Temperature is 1590 ℃ after the vacuum-treat;
E) cast after the vacuum-treat ladle being winched on the continuous casting platform, adopt automatic casting apparatus to open in the casting cycle to water and take long nozzle protection casting, prevent that steel after the vacuum-treat is by secondary oxidation.Covering slag that mold uses and tundish use insulating covering agent all to adopt little carbon (or carbon-free) type, prevent molten steel carburetting;
F) the control superheating temperature is that 20～30 ℃, pulling rate are 0.7～0.9m/min, and the control water spray is cast and the strand cooling than (cooling water inflow/molten steel amount) 1.15～1.25L/kg;
G) continuously cast bloom will carry out hot-loading and hot-conveying, and the strand charging temperature is greater than 550 ℃; Billet heating temperature is 1270～1300 ℃, stove heat-up time greater than 3 hours; Then steel billet is carried out roughing, 1100～1200 ℃ of roughing temperature, draft is more than or equal to 80%; Roughing is carried out finish rolling after accomplishing, 900～1080 ℃ of final rolling temperatures, and draft is rolled into 2.2-2.5 ㎜ steel bands greater than 91%; Steel band is through laminar flow cooling, is cooled to temperature and is 550～600 ℃ batch;
H) steel band after the aforementioned hot rolling is removed the iron scale of steel strip surface through ball blast, pickling;
I) coil of strip after the pickling utilizes twenty-high rolling mill to carry out once cold rolling;
J) steel band after the once cold rolling is delivered to continuous decarburizing annealing unit, first NaOH solution with 3～5% carries out the alkali cleaning degreasing after the steel band uncoiling, cleans through water again.Then, carry out carbonization treatment through getting into decarburization annealing furnace after the hot-air drier drying.The decarburizing annealing furnace atmosphere is N
2, H
2, H
2O, annealing temperature is 820～850 ℃, steel belt operating speed is 6～8m/min; Steel belt operating speed is confirmed according to the carbon content of raw steel;
K) steel band after the decarburizing annealing utilizes twenty-high rolling mill to carry out secondary cold-rolling again, and steel band is rolled down to the gauge of product requirement;
L) coil of strip behind the secondary cold-rolling carries out uncoiling and carries out the alkali cleaning degreasing with 3～5% NaOH solution at the Natural manganese dioxide unit, cleans through water again, and is dry through hot-air drier afterwards, and the entering lehre carries out low-temperature annealing, and furnace atmosphere is N
2, H
2, H
2O, the annealing back applies one deck MgO in steel strip surface, after the stoving oven oven dry, batches rolling;
M) applied coil of strip behind the MgO and delivered to and carry out high temperature annealing in the high temperature bell furnace, furnace atmosphere is N
2, H
2, 1150-1200 ℃ of annealing temperatures, soaking time are 20～24 hours;
N) coil of strip that the high temperature bell furnace is come out cleans and applies insulation layer at stretching coating unit, and oven dry and annealed stove are annealed and stretching and leveling then, and furnace atmosphere is N
2, H
2, temperature is 800～850 ℃ in the stove;
O) coil of strip after the stretching coating is delivered to slitting line, remove the portion that mass defect is arranged in the steel band, be packaged into Kucheng and be the finished product through shearing.
Embodiment 2
The full technology of low-temperature oriented silicon steel production of the present invention comprises the steps:
A) molten iron carries out pre-treatment earlier; S content in the molten iron is taken off to≤0.005%; The amount of harmful elements such as the C in control steel scrap, alloy and the auxiliary material, S, P, Ti, V, Nb, Zr, wherein the C content of Fe-Si alloy≤0.10 weight %, S content≤0.050 weight %, P content≤0.050 weight %, Cr content≤0.10 weight %, Ti content≤0.030 weight %, V content≤0.030 weight %, Nb content≤0.030 weight %, Zr content≤0.020 weight %; The C content of Fe-Mn alloy≤0.10 weight %, S content≤0.020 weight %, P content≤0.10 weight %; The C content of steel scrap≤0.20 weight %, S content≤0.020 weight %, P content≤0.020 weight %, Cr content≤0.10 weight %, Ti content≤0.050 weight %, V content≤0.050 weight %, Nb content≤0.050 weight %; The S content of quickened lime≤0.030 weight %; The S content of fluorite≤0.10 weight %; The S content of rhombspar≤0.020 weight %;
B) molten iron after the pre-treatment and high-quality steel scrap are added in the converter, both weight percents are 9:1.Converter smelting adopts the compound blow converter in the end, top, and employing in batches, repeatedly adds starting material such as quickened lime, light dolomite, Natural manganese dioxide ball, fluorite and iron scale and carries out slag making, and control slag alkali degree (R) >=4.0, carries out dephosphorization.Make terminal point composition and tapping temperature satisfy following the requirement: C < 0.05%; Mn < 0.015%; P < 0.010%; S < 0.010%; O < 1000PPm; Tapping temperature is 1650～1660 ℃;
C) a certain amount of aluminium of adding, copper, ferrosilicon, silicomanganese carry out deoxidation and alloying in the tapping process, add a certain amount of lime simultaneously and prevent rephosphorization.Before tapping finishes, carry out pushing off the slag with slag stop cone (ball) at tap hole, thickness of slag layer is less than 80 ㎜ in the controlling tank.In order to make the favourable come-up of deoxidation products, carry out Argon in the tapping process, stop Argon behind the tapping 3min;
D) ladle is transported to RH vacuum oven station and carries out vacuum-treat, it is 1630～1650 ℃ that vacuum begins molten steel temperature, and control vacuum tightness is carried out deoxidation less than 50Pa, vacuum processing time 20～25 minutes; Carry out the composition fine setting according to the sampling analysis result after the vacuum-treat, make the Chemical Composition of steel satisfy following the requirement: C content is 0.03%; Si content is 3.01%; Mn content is 0.22%; Cu content is 0.64%; P content is 0.011%; S content is 0.016%; Als content is 0.023%; N content is 106PPm; O content is 16PPm; Temperature is 1585 ℃ after the vacuum-treat;
E) ladle after the vacuum-treat is winched on the continuous casting platform cast, adopt automatic casting apparatus to open in the casting cycle to water and take long nozzle protection casting, prevent that molten steel after the vacuum-treat is by secondary oxidation.Covering slag that mold uses and tundish use insulating covering agent all to adopt little carbon (or carbon-free) type, prevent molten steel carburetting;
F) molten steel overheat of sheet billet continuous casting is controlled at 20～30 ℃, and pulling rate is at 0.7～0.9m/min.Than (cooling water inflow/molten steel amount), improve column crystal ratio and the segregation that reduces strand through the control water spray;
G) continuously cast bloom will carry out hot-loading and hot-conveying, and the strand charging temperature is greater than 550 ℃; Billet heating temperature is 1270～1300 ℃, stove heat-up time greater than 3 hours; Then steel billet is carried out roughing, 1100～1200 ℃ of roughing temperature, draft is more than or equal to 80%; Roughing is carried out finish rolling after accomplishing, 900～1080 ℃ of final rolling temperatures, and draft is rolled into 2.2mm-2.5mm steel band greater than 91%; Steel band is through laminar flow cooling, is cooled to temperature and is 550～600 ℃ batch;
H) steel band after the aforementioned hot rolling is removed the iron scale of steel strip surface through ball blast, pickling;
I) after the coil of strip preheating after the pickling, utilize twenty-high rolling mill to carry out once cold rolling;
J) coil of strip after the once cold rolling is delivered to continuous decarburizing annealing unit, uncoiling is also carried out the alkali cleaning degreasing with 3～5% NaOH solution, cleans through water again.Dry through hot-air drier afterwards, get into decarburization annealing furnace and carry out carbonization treatment.The decarburizing annealing furnace atmosphere is N
2, H
2, H
2O, annealing temperature is 820～850 ℃, the travelling speed of steel band in stove is 14～15m/min; Steel belt operating speed is confirmed according to the carbon content of raw steel;
K) steel band after the decarburizing annealing is rolled down to steel band the gauge of product requirement again through the twenty-high rolling mill secondary cold-rolling;
L) coil of strip behind the secondary cold-rolling carries out uncoiling and carries out the alkali cleaning degreasing with 3～5% NaOH solution at the Natural manganese dioxide unit, cleans through water again, and is dry through hot-air drier afterwards, and the entering lehre carries out low-temperature annealing, and furnace atmosphere is N
2, H
2, H
2O, the annealing back applies one deck MgO in steel strip surface, after the stoving oven oven dry, batches rolling;
M) applied coil of strip behind the MgO and delivered to and carry out high temperature annealing in the high temperature bell furnace, furnace atmosphere is N
2, H
2, 1150-1200 ℃ of annealing temperatures, soaking time are 20～24 hours;
N) coil of strip that the high temperature bell furnace is come out cleans and applies insulation layer at stretching coating unit, and oven dry and annealed stove are annealed and stretching and leveling then, and furnace atmosphere is N
2, H
2, temperature is 800～850 ℃ in the stove;
O) coil of strip after the stretching coating is delivered to slitting line, remove the part that steel band has mass defect through shearing, the packing warehouse-in becomes the finished product.
Embodiment 3
The full technology of low-temperature oriented silicon steel production of the present invention comprises the steps:
A) before the smelting oriented silicon steel, carry out hot metal pretreatment earlier, S content in the molten iron is taken off to≤0.005%, the content of harmful elements such as the C in control steel scrap, alloy and the auxiliary material, S, P, Ti, V, Nb, Zr;
B) with being that molten iron and the high-quality steel scrap (steel of steel scrap for not using and utilize) of 9:1 joins in the converter with weight ratio after the pre-treatment.Converter smelting adopts the compound blow converter in the end, top, adopts single slag process once to blow; In order to improve metallurgical effect, adopt constant voltage to become rifle position oxygen-supply operation; Employing in batches, repeatedly adds auxiliary materials such as quickened lime, light dolomite, Natural manganese dioxide ball, fluorite and iron scale and carries out slag making, and control slag alkali degree (R) >=3.5, carries out dephosphorization.Make terminal point composition and tapping temperature satisfy following the requirement: C < 0.05%; Mn < 0.015%; P < 0.010%; S < 0.010%; O < 1000PPm; Tapping temperature is 1650～1660 ℃;
C) a certain amount of aluminium of adding, copper, ferrosilicon, manganeseirom carry out deoxidation and alloying in the tapping process, add a certain amount of lime simultaneously and prevent rephosphorization.Before tapping finishes, carry out pushing off the slag with slag stop cone (ball), thickness of slag layer is less than 80 ㎜ in the controlling tank.In order to make the favourable come-up of deoxidation products, carry out Argon in the tapping process, stop Argon behind the tapping 3min;
D) ladle is transported to RH vacuum oven station and carries out vacuum-treat, it is 1630～1650 ℃ that vacuum begins molten steel temperature, and control vacuum tightness is carried out deoxidation less than 50Pa, vacuum processing time 20～25 minutes; Carry out the composition fine setting according to the sampling analysis result after the vacuum-treat, make the Chemical Composition of steel satisfy following the requirement: C content is 0.032%; Si content is 3.18%; Mn content is 0.18%; Cu content is 0.52%; P content is 0.010%; S content is 0.010%; Als content is 0.019%; N content is 91PPm; O content is 13PPm; Temperature is 1580 ℃ after the vacuum-treat;
E) ladle after the vacuum-treat is winched on the continuous casting platform cast, adopt automatic casting apparatus to open in the casting cycle to water and take long nozzle protection casting, prevent that molten steel after the vacuum-treat is by secondary oxidation.Covering slag that mold uses and tundish use insulating covering agent all to adopt little carbon (or carbon-free) type, prevent molten steel carburetting;
F) molten steel overheat of sheet billet continuous casting is controlled at 20～30 ℃, and pulling rate is at 0.7～0.9m/min.Than (cooling water inflow/molten steel amount), improve column crystal ratio and the segregation that reduces strand through the control water spray;
G) continuously cast bloom will carry out hot-loading and hot-conveying, and the strand charging temperature is greater than 550 ℃; Billet heating temperature is 1270～1300 ℃, stove heat-up time greater than 3 hours; Then steel billet is carried out roughing, 1100～1200 ℃ of roughing temperature, draft is more than or equal to 80%; Roughing is carried out finish rolling after accomplishing, 900～1080 ℃ of final rolling temperatures, and draft is rolled into 2.2mm-2.5mm steel band greater than 91%; It is 550～600 ℃ that steel band is cooled to temperature through laminar flow, batches;
H) steel band after the aforementioned hot rolling is removed the iron scale of steel strip surface through ball blast, pickling;
I) coil of strip after the pickling utilizes twenty-high rolling mill to carry out once cold rolling;
J) steel band after the once cold rolling is delivered to continuous decarburizing annealing unit, first NaOH solution with 3～5% carries out the alkali cleaning degreasing after the uncoiling, cleans through water again.Then, carry out carbonization treatment through getting into decarburization annealing furnace after the hot-air drier drying.The annealing furnace atmosphere is N
2, H
2, H
2O, annealing temperature is 820～850 ℃, steel belt operating speed is 6～8m/min; Steel belt operating speed is confirmed according to the carbon content of raw steel;
K) steel band after the decarburizing annealing carries out secondary cold-rolling with twenty-high rolling mill again, and steel band is rolled down to the gauge of product requirement.
L) uncoiling and carry out the alkali cleaning degreasing with 3～5% NaOH solution on the Natural manganese dioxide unit of the coil of strip behind the secondary cold-rolling is cleaned through water again.Dry through hot-air drier afterwards, get into lehre and carry out low-temperature annealing, furnace atmosphere is N
2, H
2, H
2O, the annealing back applies one deck MgO in steel strip surface, after the stoving oven oven dry, batches rolling;
M) applied coil of strip behind the MgO and delivered to and carry out high temperature annealing in the high temperature bell furnace, furnace atmosphere is N
2, H
2, 1150-1200 ℃ of annealing temperatures, soaking time are 20～24 hours;
N) coil of strip that the high temperature bell furnace is come out cleans and applies insulation layer at stretching coating unit, and oven dry and annealed stove are annealed and stretching and leveling then, and furnace atmosphere is N
2, H
2, temperature is 800～850 ℃ in the stove;
O) with coil of strip after the stretching coating shear remove defective after, the packing warehouse-in becomes the finished product.
Embodiment 4
The full technology of low-temperature oriented silicon steel production of the present invention comprises the steps:
A) before the low-temperature oriented silicon steel of smelting, molten iron carries out pre-treatment earlier, and soon S content takes off to≤0.005% in the molten iron, the content of harmful elements such as the C in control steel scrap, alloy and the auxiliary material, S, P, Ti, V, Nb, Zr;
B) be in the molten iron and high-quality steel scrap (steel of steel scrap) adding converter of 9:1 with weight ratio after the pre-treatment for not using and utilize.Converter smelting adopts the compound blow converter in the end, top, adopts single slag process once to blow; In order to improve metallurgical effect, adopt constant voltage to become rifle position oxygen-supply operation; Employing in batches, repeatedly adds starting material such as quickened lime, light dolomite, Natural manganese dioxide ball, fluorite and iron scale and carries out slag making, and control slag alkali degree (R) >=3.5, carries out dephosphorization.Make terminal point composition and tapping temperature satisfy following the requirement: C < 0.05%; Mn < 0.015%; P < 0.010%; S < 0.010%; O < 1000PPm; Tapping temperature is 1650～1660 ℃;
C) a certain amount of aluminium of adding, copper, ferrosilicon, manganeseirom carry out deoxidation and alloying in the tapping process, add a certain amount of lime simultaneously and prevent rephosphorization.Before tapping finishes, carry out pushing off the slag with slag stop cone (ball), thickness of slag layer is less than 100 ㎜ in the controlling tank.In order to make the favourable come-up of deoxidation products, carry out Argon in the tapping process, stop Argon behind the tapping 3min;
D) ladle is transported to RH vacuum oven station and carries out vacuum-treat, it is 1630～1650 ℃ that vacuum begins molten steel temperature, and control vacuum tightness is carried out deoxidation less than 50Pa, vacuum processing time 20～25 minutes; Carry out the composition fine setting according to the sampling analysis result after the vacuum-treat, make the Chemical Composition of molten steel satisfy following the requirement: C content is 0.025%; Si content is 3.01%; Mn content is 0.22%; Cu content is 0.63%; P content is 0.011%; S content is 0.016%; Als content is 0.023%; N content is 106PPm; O content is 16PPm; Temperature is 1587 ℃ after the vacuum-treat;
E) ladle after the vacuum-treat is winched on the continuous casting platform cast, adopt automatic casting apparatus in the casting cycle and take long nozzle protection casting, prevent that molten steel after the vacuum-treat is by secondary oxidation.Covering slag that mold uses and tundish use insulating covering agent all to adopt little carbon (or carbon-free) type, prevent molten steel carburetting;
F) molten steel overheat of sheet billet continuous casting is controlled at 20～30 ℃, and pulling rate is at 0.7～0.9m/min.Than (cooling water inflow/molten steel amount), improve column crystal ratio and the segregation that reduces strand through the control water spray;
G) continuously cast bloom will carry out hot-loading and hot-conveying, and the strand charging temperature is greater than 550 ℃; Billet heating temperature is 1270～1300 ℃, stove heat-up time greater than 3 hours; Then steel billet is carried out roughing, 1100～1200 ℃ of roughing temperature, draft is more than or equal to 80%; Roughing is carried out finish rolling after accomplishing, 900～1080 ℃ of final rolling temperatures, and draft is rolled into 2.2mm-2.5mm band greater than 91%; Steel band is cooled to temperature through laminar flow and is 550～600 ℃ and batches;
H) steel band after the aforementioned hot rolling is passed through ball blast, pickling, remove the iron scale of steel strip surface;
I) after the coil of strip preheating after the pickling, utilize and carry out once cold rolling in the twenty-high rolling mill;
J) steel band after the once cold rolling is delivered to continuous decarburizing annealing unit and carry out uncoiling, and earlier carry out the alkali cleaning degreasing, clean through water again with 3～5% NaOH solution.Dry through hot-air drier then, get into decarburization annealing furnace and carry out carbonization treatment, furnace atmosphere is N
2, H
2, H
2O, annealing temperature is 820～850 ℃, steel belt operating speed is 14～15m/min; Steel belt operating speed is confirmed according to the carbon content of raw steel;
K) steel band after the decarburizing annealing carries out secondary cold-rolling with twenty-high rolling mill again, and steel band is rolled down to the gauge of product requirement;
L) coil of strip behind the secondary cold-rolling carries out uncoiling and carries out the alkali cleaning degreasing with 3～5% NaOH solution at the Natural manganese dioxide unit, cleans through water again, and is dry through hot-air drier afterwards, and the entering lehre carries out low-temperature annealing, and furnace atmosphere is N
2, H
2, H
2O, the annealing back applies one deck MgO in steel strip surface, after the stoving oven oven dry, batches rolling;
M) applied coil of strip behind the MgO and delivered to and carry out high temperature annealing in the high temperature bell furnace, furnace atmosphere is N
2, H
2, 1150-1200 ℃ of annealing temperatures, soaking time are 20～24 hours;
N) coil of strip that the high temperature bell furnace is come out cleans and applies insulation layer at stretching coating unit, and oven dry and annealed stove are annealed and stretching and leveling then, and furnace atmosphere is N
2, H
2, temperature is 800～850 ℃ in the stove;
O) with coil of strip after the stretching coating shear remove defective after, the packing warehouse-in becomes the finished product.
The full technology of the low-temperature oriented silicon steel production of the present invention: hot metal pretreatment → converter → RH vacuum-treat → sheet billet continuous casting → hot-loading and hot-conveying → slab heating → hot rolling → once cold rolling → one time decarburizing annealing → secondary cold-rolling → low temperature recovers annealing and is coated with Natural manganese dioxide → high temperature cover annealing → stretching to be coated with insulation layer → slitting, packing, warehouse-in, and final production goes out low-temperature oriented silicon steel.On the basis of AlN suppressor factor, add 0.48～0.63% Cu formed AlN+ (Mn, Cu)
2S+Cu
2 The S composite inhibitor owing to its solid solubility temperature low (being 1250～1280 ℃), can reduce the Heating temperature of steel billet; Relaxed the composition scope of C content, converter smelting composition hit rate reaches 100%.Through adjusting the purpose that steel band speed and furnace atmosphere have reached a decarburization, can directly the silicon steel carbon content once be taken off to 30ppm from 250-550ppm; Employing AlN+ (Mn, Cu)
2S+Cu
2S is that composite inhibitor is produced low-temperature oriented silicon steel, makes to suppress a grain growth ability and obtained reinforcement, and it is more perfect that (110) (001) secondary recrystallization forms to accurately in the position, and magnetic property is better.
The key technical indexes of cold rolling orientation silicon steel production technology of the present invention:
1. C content is 0.025～0.055%, and C content once takes off to 30ppm from 250-550ppm;
2. magnetic strength, iron loss can be up to state standards finished product rate fully>89%;
3. the content 0.45～0.65% of suppressor factor element Cu.
Cold-rolled orientation silicon steel the key technical indexes by the present invention's production: core loss value (P
1.7/50), magnetic strength value (B
08/50)
1. product operative norm
GB GB/T2521-2008, GB/T3655-2008, GB/T2522-2007, YB/T5224-2006.
2. portioned product detects index
Other index detects:
Interlamination resistance>=60 Ω .cm
2/ sheet
Tack A – C level
In sum; The full technology of the low-temperature oriented silicon steel production of the present invention; Have production technology simple relatively, reduce production costs, technical characterstic such as magnetic property is better, have also simultaneously that the required Heating temperature of hot rolling slab is low, converter smelting oriented silicon steel composition shoots straight, a plurality of advantages such as decarburizing annealing.
Claims (1)
1. the full technology of low-temperature oriented silicon steel production is characterized in that this technology comprises the steps:
A) hot metal pretreatment adds converter smelting with Fe-Si alloy, Fe-Mn alloy, steel scrap, quickened lime, fluorite and rhombspar, and S content in the molten iron is taken off to≤0.005 weight %; Wherein the C content of Fe-Si alloy≤0.10 weight %, S content≤0.050 weight %, P content≤0.050 weight %, Cr content≤0.10 weight %, Ti content≤0.030 weight %, V content≤0.030 weight %, Nb content≤0.030 weight %, Zr content≤0.020 weight %; The C content of Fe-Mn alloy≤0.10 weight %, S content≤0.020 weight %, P content≤0.10 weight %; The C content of steel scrap≤0.20 weight %, S content≤0.020 weight %, P content≤0.020 weight %, Cr content≤0.10 weight %, Ti content≤0.050 weight %, V content≤0.050 weight %, Nb content≤0.050 weight %; The S content of quickened lime≤0.030 weight %; The S content of fluorite≤0.10 weight %; The S content of rhombspar≤0.020 weight %;
B) above-mentioned pretreated molten iron and steel scrap are added the compound blow converter in the end, top by weight 9:1; In aforementioned compound per ton, add quickened lime 40～50Kg, light dolomite 15～20kg, Natural manganese dioxide ball 1.5～1.9Kg, fluorite 2～3kg and iron scale 1.5～2.5kg and carry out slag making; And control basicity of slag R is 4.0～4.5; After carrying out dephosphorization treatment, adopt once blowing to make the composition of endpoint molten steel satisfy following the requirement: C < 0.04 weight %, Mn < 0.015 weight %, P < 0.010 weight %, S < 0.010 weight %, O < 1000 weight PPm; Tapping temperature is 1650～1660 ℃;
C) carry out deoxidation in the aluminium that adds 8Kg * steel water oxygen weight % ratio in the molten steel per ton in the tapping process; And according to desired Chemical Composition of low-temperature oriented silicon steel and sampling analysis result; In tapping process, add copper, ferrosilicon and ferromanganese and carry out alloying, add copper, ferrosilicon and ferromanganese before the tap to 70%, add 20～30Kg lime by molten steel per ton simultaneously and prevent the molten steel rephosphorization; Before tapping finishes; Carry out pushing off the slag with slag stop cone or slag-blocking ball at tap hole, thickness of slag layer is less than 80mm in the controlling tank, and the molten steel after the tapping gets into ladle; Carry out Argon in the tapping process, tapping stopped Argon after 3 minutes;
D) ladle is sent into the RH vacuum oven and carry out vacuum-treat, the control liquid steel temperature was 1630～1650 ℃ when vacuum-treat began, and control vacuum tightness is carried out deoxidation less than 50Pa, vacuum processing time 20～25 minutes; After the vacuum-treat, carry out the composition fine setting according to sampling analysis result and the desired Chemical Composition adding of low-temperature oriented silicon steel copper, ferrosilicon, ferromanganese, silicon nitride and aluminium etc., make the Chemical Composition of molten steel satisfy following the requirement: C content is 0.025～0.055 weight %; Si content is 2.9～3.3 weight %; Mn content is 0.15～0.25 weight %; Cu content is 0.45～0.63 weight %; P content≤0.015 weight %; S content is 0.07～0.018 weight %; Als content is 0.008～0.032 weight %; N content is 50～130 weight PPm; O content≤20 weight PPm; Temperature is 1575～1590 ℃ after the vacuum-treat;
E) ladle after the vacuum-treat is winched on the continuous casting platform cast, adopt automatic casting apparatus to open to water in the casting cycle and water with long nozzle protection; The insulating covering agent that covering slag that mold uses and tundish use all adopts little carbon or carbon-free type;
F) the control superheating temperature is that 20～30 ℃, pulling rate are 0.7～0.9m/min, and the ratio of the controlled chilling water yield and molten steel amount is that 1.15～1.25L/kg casts;
G) steel billet that casting is obtained is delivered in the process furnace, and charging temperature is greater than 550 ℃; Heating temperature is 1270～1300 ℃, stove heat-up time greater than 3 hours; Then steel billet is carried out roughing, 1100～1200 ℃ of roughing temperature, draft is more than or equal to 80%; Roughing is carried out finish rolling after accomplishing, and 900～1080 ℃ of final rolling temperatures, draft are rolled into 2.2-2.5mm steel band more than or equal to 90%; Through laminar flow cooling steel band being cooled to temperature is 550～600 ℃ and batches;
H) steel band after the aforementioned hot rolling is removed the iron scale of steel strip surface through ball blast, pickling;
I) after the coil of strip preheating after the pickling, utilize twenty-high rolling mill to carry out once cold rolling;
J) coil of strip after the once cold rolling is delivered to continuous decarburizing annealing unit, first NaOH solution with 3～5% carries out the alkali cleaning degreasing after the uncoiling, cleans through water again, carries out carbonization treatment through getting into decarburization annealing furnace after the hot-air drier drying afterwards, and furnace atmosphere is N
2, H
2, H
2O, annealing temperature is 820～850 ℃, steel band passes through decarburization annealing furnace with the speed of 6～15m/min, realizes a decarburization;
K) steel band after the decarburizing annealing utilizes twenty-high rolling mill to carry out secondary cold-rolling again, is rolled down to the desired gauge of product;
L) coil of strip behind the secondary cold-rolling carries out uncoiling and carries out the alkali cleaning degreasing with 3～5% NaOH solution at the Natural manganese dioxide unit, cleans through water again, and is dry through hot-air drier afterwards, and the entering lehre carries out low-temperature annealing, and furnace atmosphere is N
2, H
2, H
2O, the annealing back applies one deck MgO in steel strip surface, after the stoving oven oven dry, batches rolling;
M) applied coil of strip behind the MgO and delivered to and carry out high temperature annealing in the high temperature bell furnace, furnace atmosphere is N
2, H
2, 1150-1200 ℃ of annealing temperatures, soaking time are 20～24 hours;
N) coil of strip that the high temperature bell furnace is come out cleans and applies insulation layer at stretching coating unit, and oven dry and annealed stove are annealed and stretching and leveling then, and furnace atmosphere is N
2, H
2, temperature is 800～850 ℃ in the stove;
O) with coil of strip after the stretching coating shear remove defective after, the packing warehouse-in becomes the finished product.
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| CN102925622A (en) * | 2012-11-02 | 2013-02-13 | 攀枝花钢城集团瑞钢工业有限公司 | Application method of ferrosilicon in molten steel deoxidization |
| CN102962267A (en) * | 2012-11-27 | 2013-03-13 | 南京钢铁股份有限公司 | Cooling control process for preventing decarbonization of small-size spring steel |
| CN103255278A (en) * | 2012-02-21 | 2013-08-21 | 宝山钢铁股份有限公司 | Strip steel annealing method |
| CN103266205A (en) * | 2013-04-12 | 2013-08-28 | 南通新京隆电器有限公司 | EI type orientation silicon steel plate annealing process |
| CN103451395A (en) * | 2013-09-08 | 2013-12-18 | 包头市威丰电磁材料有限责任公司 | Preparation process of chromium alloyed high-magnetic strength and low-iron loss oriented silicon steel |
| CN103451515A (en) * | 2013-08-23 | 2013-12-18 | 安阳钢铁股份有限公司 | Method for controlling AlN inhibitor content in oriented silicon steel |
| CN103484643A (en) * | 2013-08-23 | 2014-01-01 | 安阳钢铁股份有限公司 | Method for preventing hot rolling edge fractures in oriented silicon steel |
| CN103725995A (en) * | 2013-12-27 | 2014-04-16 | 东北大学 | Preparation method of oriented high silicon electrical steel |
| CN103774042A (en) * | 2013-12-23 | 2014-05-07 | 钢铁研究总院 | High-magnetic-induction oriented silicon steel prepared through thin slab continuous casting and rolling and preparation method thereof |
| CN104313467A (en) * | 2014-09-23 | 2015-01-28 | 北京首钢股份有限公司 | Non-oriented electrical steel smelting method |
| CN105400938A (en) * | 2015-11-24 | 2016-03-16 | 武汉钢铁(集团)公司 | Production method for low-temperature high-magnetic-strength oriented silicon steel |
| CN105568118A (en) * | 2015-12-24 | 2016-05-11 | 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 |
| CN106011423A (en) * | 2016-06-15 | 2016-10-12 | 南阳师范学院 | Temperature rolling process of cold-rolled non-oriented electrical steel |
| CN106048390A (en) * | 2016-07-18 | 2016-10-26 | 华南理工大学 | Method for producing non-oriented electrical steel 50W800 through thin slab casting and rolling |
| CN107488815A (en) * | 2017-08-25 | 2017-12-19 | 包头钢铁（集团）有限责任公司 | A kind of medium temperature orientation silicon steel hot rolled strip and preparation method thereof |
| CN110578036A (en) * | 2019-09-26 | 2019-12-17 | 湖南华菱涟钢薄板有限公司 | RH refining method and smelting process of aluminum-containing electrical steel |
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| CN113930593A (en) * | 2021-10-26 | 2022-01-14 | 无锡普天铁心股份有限公司 | Production method of low-loss wide-material oriented silicon steel |
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| 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 |
| CN116065006A (en) * | 2022-11-29 | 2023-05-05 | 无锡普天铁心股份有限公司 | Gradient decarburization annealing method for improving surface quality of secondary cold-rolled oriented silicon steel |
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| CN103725995A (en) * | 2013-12-27 | 2014-04-16 | 东北大学 | Preparation method of oriented high silicon electrical steel |
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| CN111733362A (en) * | 2020-06-29 | 2020-10-02 | 马鞍山钢铁股份有限公司 | Silicon steel plate easy to pickle and production method thereof |
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| CN113930593A (en) * | 2021-10-26 | 2022-01-14 | 无锡普天铁心股份有限公司 | Production method of low-loss wide-material oriented silicon steel |
| CN113930593B (en) * | 2021-10-26 | 2024-01-16 | 无锡普天铁心股份有限公司 | Production method of low-loss wide-material oriented silicon steel |
| CN115449696A (en) * | 2022-08-30 | 2022-12-09 | 武汉钢铁有限公司 | Production method for improving magnetic induction strength of low-temperature high-magnetic-induction oriented silicon steel |
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