CN102330021B - Full production process of low-temperature oriented silicon steel - Google Patents

Full production process of low-temperature oriented silicon steel Download PDF

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CN102330021B
CN102330021B CN 201110273632 CN201110273632A CN102330021B CN 102330021 B CN102330021 B CN 102330021B CN 201110273632 CN201110273632 CN 201110273632 CN 201110273632 A CN201110273632 A CN 201110273632A CN 102330021 B CN102330021 B CN 102330021B
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CN102330021A (en
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刘鹏程
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Baotou Weifeng rare earth magnetic materials Limited by Share Ltd
Jiangyou Fengwei New Material Co., Ltd.
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JIANGYOU FENGWEI SPECIAL STRIP STEEL CO Ltd
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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

Full production process of low-temperature oriented silicon steel
Technical field
The present invention relates to metallurgical technology field, particularly the full technique of a kind of low temperature cold-rolled orientation silicon steel production.
Background technology
Oriented silicon steel is the main raw material of making the power equipments such as transformer, mutual inductor.The loss of the electric energy of power system is very large, 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 of low-temperature oriented silicon steel and reduce iron loss, not only can reduce loss and the save energy of transformer, and the iron core section is dwindled, volume of transformer reduces, and weight saving has significantly reduced the transformer cost of manufacture simultaneously.
Oriented silicon steel has magnetic strength height, advantage that iron loss is low, but the transformer loss with the transformer decrease of its making, have better energy-saving effect, but the production cycle of oriented silicon steel is long, production technique and equipment is complicated, 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 be main as inhibitor, and the effect of inhibitor is to utilize " solid solution-separate out " principle, namely when high temperature with the solid solution of macrobead MnS, AlN, in course of hot rolling, separate out tiny uniform AlN, MnS.Because tiny, the uniform AlN that separates out at crystal boundary and MnS play the effect of pinning at crystal boundary, have suppressed grain growth one time, (110) (001) subgrain are grown up, so just can become desirable oriented silicon steel at last.The solid solubility temperature of inhibitor has determined the Heating temperature of slab, and adopting AlN, MnS is that main slab heating temperature as inhibitor is 1330~1350 ℃.The Heating temperature height has a strong impact on the work-ing life of process furnace, and energy dissipation is large, 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 nippon company and Kawasaki Steel company produce is in quality product, or the aspects such as new technology and new product development, all is in rank first.Nippon Steel Corp is to adopt inhibitor and heavy reduction rate once cold rolling method take AlN as the master to produce high magnetic strength, hang down the Hi-B steel series product of iron loss.Kawasaki Steel company adopts with MnSe+Sb inhibitor 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, the reasons such as the low and production cost height of product lumber recovery and qualification rate have limited the development of oriented silicon steel.Wuhan Iron ﹠ Steel (Group) Corp. had introduced cold rolled silicon steel manufacturing equipment and patent from nippon in 1974, formal orientation and the non orientating silicon steel of producing 11 trades mark in 1979.By digestion, the absorption of decades, in 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, supply of electric power is obviously not enough.Generating capacity is constantly increasing, and the generating total volume has surpassed 6.1 hundred million kW, needs every year on average oriented silicon steel more than 1,500,000 tons, and China has now become one of maximum consumption market of world's oriented silicon steel.The amount of domestic production oriented silicon steel does not satisfy 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 equipment are complicated, production cost is high, technical threshold is high and has expanded production.Its major cause is: (1) selects that inhibitor is comparatively single, the solid solubility temperature of inhibitor is high, and the Heating temperature of slab need to 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, equipment is complicated, influence factor is 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 the 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, a relative Full production process of low-temperature oriented silicon steel of simple (decarburizing annealing), the advantage such as production cost is low, the finished product magnetic property is better of production technique.
The objective of the invention is to be achieved through the following technical solutions.
Full production process of low-temperature oriented silicon steel 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 % by weight; Wherein the C content of Fe-Si alloy≤0.10 % by weight, S content≤0.050 % by weight, P content≤0.050 % by weight, Cr content≤0.10 % by weight, Ti content≤0.030 % by weight, V content≤0.030 % by weight, Nb content≤0.030 % by weight, Zr content≤0.020 % by weight; The C content of Fe-Mn alloy≤0.10 % by weight, S content≤0.020 % by weight, P content≤0.10 % by weight; The C content of steel scrap≤0.20 % by weight, S content≤0.020 % by weight, P content≤0.020 % by weight, Cr content≤0.10 % by weight, Ti content≤0.050 % by weight, V content≤0.050 % by weight, Nb content≤0.050 % by weight; The S content of quickened lime≤0.030 % by weight; The S content of fluorite≤0.10 % by weight; The S content of rhombspar≤0.020 % by 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, magnesium oxide ball 1.5~1.9Kg, fluorite 2~3kg and iron scale 1.5~2.5kg 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 % by weight, Mn<0.015 % by weight, P<0.010 % by weight, S<0.010 % by weight, O<1000 weight PPm; Tapping temperature is 1650~1660 ℃;
C) carry out deoxidation in the aluminium that adds 8Kg * steel water oxygen % by weight ratio in the molten steel per ton in the tapping process; And according to the 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 rephosphorization of molten steel, 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 control tank, and the molten steel after the tapping enters ladle; Carry out Argon in the tapping process, tapping stopped Argon after 3 minutes;
D) ladle is sent into the RH vacuum oven and carried 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 % by weight; Si content is 2.9~3.3 % by weight; Mn content is 0.15~0.25 % by weight; Cu content is 0.45~0.63 % by weight; P content≤0.015 % by weight; S content is 0.07~0.018 % by weight; Als content is 0.008~0.032 % by 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 with long nozzle protection in the casting cycle and water; The insulating covering agent that the covering slag that crystallizer 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 control cooling water inflow 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%; Carry out finish rolling after roughing is finished, 900~1080 ℃ of final rolling temperatures, draft are rolled into 2.2-2.5mm steel band more than or equal to 90%; By 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 by 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, after the uncoiling first the NaOH solution with 3~5% carry out the alkali cleaning degreasing, clean through water again, dry by hot-air drier afterwards, enter 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) recycling of the steel band after decarburizing annealing twenty-high rolling mill carries out secondary cold-rolling, 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 magnesium oxide unit, cleans through water again, by the hot-air drier drying, enters annealing furnace and carries out low-temperature annealing afterwards, and furnace atmosphere is N 2, H 2, H 2O, at steel strip surface coating one deck MgO, the drying bake oven is batched rolling after doing after the annealing;
M) be coated coil of strip behind the MgO and deliver to and carry out high temperature annealing in the high temperature bell-type furnace, furnace atmosphere is N 2, H 2, 1150-1200 ℃ of annealing temperatures, soaking time are 20~24 hours;
N) high temperature bell-type furnace coil of strip is out cleaned and coating insulating layer at stretching coating unit, then oven dry and annealed stove are annealed and stretching and leveling, and furnace atmosphere is N 2, H 2, temperature is 800~850 ℃ in the stove;
O) with after coil of strip carries out the shear removal defective after the stretching coating, the packing warehouse-in becomes the finished product.
The beneficial effect of Full production process of low-temperature oriented silicon steel 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 ℃; Add (Mn, the Cu) that Cu forms at oriented silicon steel 2The solid solubility temperature of S composite inhibitor is all lower, can reduce slab in the Heating temperature of process furnace, reduces about 30-50 ℃ of temperature; Can improve the work-ing life of process furnace with energy-saving and cost-reducing, can reduce the oxidization burning loss about 1.5% of silicon steel simultaneously, and improve lumber recovery.
2. after in steel, adding Cu, tiny uniformly (Mn, the Cu) that forms at crystal boundary 2S and Cu 2 The S particle has played pinning effect at crystal boundary, has suppressed grain growth one time.Also have AlN inhibitor, (Mn, Cu) at crystal boundary simultaneously 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 be conducive to the position.Cu is the element that enlarges γ-phase region in addition, is conducive to improve 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%.When converter smelting is controlled at 0.030% with C content, it also is the limit of converter smelting.In addition, because the C that contains in the refractory materials that the 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.By 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 large, 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 large to magnetic property harm.Improve C content, can reduce the O content in the steel, can reduce production costs and reduce Al 2O 3Impact on 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 when guaranteeing that γ-phase amount is 20~30%, can make the hot-rolled sheet structure refinement.But Fe 3C is very harmful to the magnetic property of steel, and the impact 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 adjusting 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 a decarburizing annealing and secondary cold-rolling to finish, 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 by following embodiment.
Embodiment 1
Full production process of low-temperature oriented silicon steel 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 for not using and utilize) adding converter of 9:1 with weight ratio after the pre-treatment.Converter smelting adopts the compound blow converter in the end, top, and employing in batches, repeatedly adds the starting material such as quickened lime, light dolomite, magnesium oxide 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 % by weight ratio per ton carries out deoxidation in the tapping process, adds copper, ferrosilicon and ferromanganese while tapping again; 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 % by weight, Si content is 2.9~3.3 % by weight; Mn content is 0.15~0.25 % by weight, will add copper, ferrosilicon and ferromanganese before the tap to 70%, carries out alloying, adds simultaneously 20~30Kg/t lime and prevents rephosphorization of molten steel.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 control tank, and the molten steel after the tapping enters 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 such as sampling analysis there are differences, then the 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 by adding a small amount of copper, ferrosilicon, ferromanganese, silicon nitride and aluminium etc., make the chemical ingredients of steel satisfy the desired scope of composition, namely 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 the long nozzle protective casting, prevent that steel after the vacuum-treat is by secondary oxidation.The covering slag that crystallizer 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 slab 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%; After finishing, roughing carries out finish rolling, 900~1080 ℃ of final rolling temperatures, and draft is rolled into 2.2-2.5 ㎜ steel bands greater than 91%; Steel band cools off by laminar flow, 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 by 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, after the steel band uncoiling first the NaOH solution with 3~5% carry out the alkali cleaning degreasing, clean through water again.Then, carry out carbonization treatment by entering 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 determined according to the carbon content of raw steel;
K) recycling of the steel band after decarburizing annealing twenty-high rolling mill carries out secondary cold-rolling, 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 magnesium oxide unit, cleans through water again, by the hot-air drier drying, enters annealing furnace and carries out low-temperature annealing afterwards, and furnace atmosphere is N 2, H 2, H 2O, at steel strip surface coating one deck MgO, the drying bake oven is batched rolling after doing after the annealing;
M) be coated coil of strip behind the MgO and deliver to and carry out high temperature annealing in the high temperature bell-type furnace, furnace atmosphere is N 2, H 2, 1150-1200 ℃ of annealing temperatures, soaking time are 20~24 hours;
N) high temperature bell-type furnace coil of strip is out cleaned and coating insulating layer at stretching coating unit, then oven dry and annealed stove are annealed and stretching and leveling, 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 section that mass defect is arranged in the steel band by shearing, be packaged into Kucheng and be the finished product.
Embodiment 2
Full production process of low-temperature oriented silicon steel of the present invention comprises the steps:
A) molten iron carries out first pre-treatment, S content in the molten iron is taken off to≤0.005%, the amount of the harmful elements such as C, the S in control steel scrap, alloy and the auxiliary material, P, Ti, V, Nb, Zr, wherein the C content of Fe-Si alloy≤0.10 % by weight, S content≤0.050 % by weight, P content≤0.050 % by weight, Cr content≤0.10 % by weight, Ti content≤0.030 % by weight, V content≤0.030 % by weight, Nb content≤0.030 % by weight, Zr content≤0.020 % by weight; The C content of Fe-Mn alloy≤0.10 % by weight, S content≤0.020 % by weight, P content≤0.10 % by weight; The C content of steel scrap≤0.20 % by weight, S content≤0.020 % by weight, P content≤0.020 % by weight, Cr content≤0.10 % by weight, Ti content≤0.050 % by weight, V content≤0.050 % by weight, Nb content≤0.050 % by weight; The S content of quickened lime≤0.030 % by weight; The S content of fluorite≤0.10 % by weight; The S content of rhombspar≤0.020 % by 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 the starting material such as quickened lime, light dolomite, magnesium oxide 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 component controlling in the tapping process, add simultaneously a certain amount of lime 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 control 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 the long nozzle protective casting, prevent that molten steel after the vacuum-treat is by secondary oxidation.The covering slag that crystallizer 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 the segregation of column crystal ratio and minimizing strand by 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%; After finishing, roughing carries out finish rolling, 900~1080 ℃ of final rolling temperatures, and draft is rolled into 2.2mm-2.5mm steel band greater than 91%; Steel band cools off by laminar flow, 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 by 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 by hot-air drier afterwards, enter 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 determined 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 magnesium oxide unit, cleans through water again, by the hot-air drier drying, enters annealing furnace and carries out low-temperature annealing afterwards, and furnace atmosphere is N 2, H 2, H 2O, at steel strip surface coating one deck MgO, the drying bake oven is batched rolling after doing after the annealing;
M) be coated coil of strip behind the MgO and deliver to and carry out high temperature annealing in the high temperature bell-type furnace, furnace atmosphere is N 2, H 2, 1150-1200 ℃ of annealing temperatures, soaking time are 20~24 hours;
N) high temperature bell-type furnace coil of strip is out cleaned and coating insulating layer at stretching coating unit, then oven dry and annealed stove are annealed and stretching and leveling, 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 by shearing, the packing warehouse-in becomes the finished product.
Embodiment 3
Full production process of low-temperature oriented silicon steel of the present invention comprises the steps:
A) before the smelting oriented silicon steel, carry out first hot metal pretreatment, S content in the molten iron is taken off to≤0.005%, the content of the harmful elements such as C, the S in control steel scrap, alloy and the auxiliary material, P, Ti, V, Nb, Zr;
B) molten iron and the high-quality steel scrap (steel of steel scrap for not using and utilize) that after the pre-treatment with weight ratio is 9:1 joined in the converter.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 the auxiliary materials such as quickened lime, light dolomite, magnesium oxide 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 component controlling in the tapping process, add simultaneously a certain amount of lime 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 control 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 the long nozzle protective casting, prevent that molten steel after the vacuum-treat is by secondary oxidation.The covering slag that crystallizer 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 the segregation of column crystal ratio and minimizing strand by 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%; After finishing, roughing carries out finish rolling, 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 by laminar flow, batches;
H) steel band after the aforementioned hot rolling is removed the iron scale of steel strip surface by 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, after the uncoiling first the NaOH solution with 3~5% carry out the alkali cleaning degreasing, clean through water again.Then, carry out carbonization treatment by entering 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 determined 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 magnesium oxide unit of the coil of strip behind the secondary cold-rolling is cleaned through water again.Dry by hot-air drier afterwards, enter annealing furnace and carry out low-temperature annealing, furnace atmosphere is N 2, H 2, H 2O, at steel strip surface coating one deck MgO, the drying bake oven is batched rolling after doing after the annealing;
M) be coated coil of strip behind the MgO and deliver to and carry out high temperature annealing in the high temperature bell-type furnace, furnace atmosphere is N 2, H 2, 1150-1200 ℃ of annealing temperatures, soaking time are 20~24 hours;
N) high temperature bell-type furnace coil of strip is out cleaned and coating insulating layer at stretching coating unit, then oven dry and annealed stove are annealed and stretching and leveling, and furnace atmosphere is N 2, H 2, temperature is 800~850 ℃ in the stove;
O) with after coil of strip carries out the shear removal defective after the stretching coating, the packing warehouse-in becomes the finished product.
Embodiment 4
Full production process of low-temperature oriented silicon steel of the present invention comprises the steps:
A) before the smelting low-temperature oriented silicon steel, molten iron carries out first pre-treatment, and soon S content takes off to≤0.005% in the molten iron, the content of the harmful elements such as C, the S in control steel scrap, alloy and the auxiliary material, P, Ti, V, Nb, Zr;
B) be in the molten iron and high-quality steel scrap (steel of steel scrap for not using and utilize) adding converter of 9:1 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 the starting material such as quickened lime, light dolomite, magnesium oxide 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 component controlling in the tapping process, add simultaneously a certain amount of lime 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 control 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 the long nozzle protective casting, prevent that molten steel after the vacuum-treat is by secondary oxidation.The covering slag that crystallizer 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 the segregation of column crystal ratio and minimizing strand by 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%; After finishing, roughing carries out finish rolling, 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 by 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 carried out uncoiling, and carry out the alkali cleaning degreasing with 3~5% NaOH solution first, clean through water again.Then dry by hot-air drier, enter 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 determined 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 magnesium oxide unit, cleans through water again, by the hot-air drier drying, enters annealing furnace and carries out low-temperature annealing afterwards, and furnace atmosphere is N 2, H 2, H 2O, at steel strip surface coating one deck MgO, the drying bake oven is batched rolling after doing after the annealing;
M) be coated coil of strip behind the MgO and deliver to and carry out high temperature annealing in the high temperature bell-type furnace, furnace atmosphere is N 2, H 2, 1150-1200 ℃ of annealing temperatures, soaking time are 20~24 hours;
N) high temperature bell-type furnace coil of strip is out cleaned and coating insulating layer at stretching coating unit, then oven dry and annealed stove are annealed and stretching and leveling, and furnace atmosphere is N 2, H 2, temperature is 800~850 ℃ in the stove;
O) with after coil of strip carries out the shear removal defective after the stretching coating, the packing warehouse-in becomes the finished product.
Full production process of low-temperature oriented silicon steel of the present invention: hot metal pretreatment → converter → RH vacuum-treat → sheet billet continuous casting → hot-loading and hot-conveying → heating of plate blank → hot rolling → once cold rolling → one time decarburizing annealing → secondary cold-rolling → low temperature recovers annealing and is coated with magnesium oxide → high temperature bell-type furnace 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 inhibitor, the Cu of interpolation 0.48~0.63% has 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%.Reached the purpose of a decarburization by adjusting steel band speed and furnace atmosphere, can directly the silicon steel carbon content once have been taken off to 30ppm from 250-550ppm; Adopt 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 that 0.025~0.055%, 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 inhibitor 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, Full production process of low-temperature oriented silicon steel of the present invention, have production technology relatively simple, reduce production costs, the 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, the plurality of advantages such as decarburizing annealing.

Claims (1)

1. Full production process of low-temperature oriented silicon steel is characterized in that this technique 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 % by weight; Wherein the C content of Fe-Si alloy≤0.10 % by weight, S content≤0.050 % by weight, P content≤0.050 % by weight, Cr content≤0.10 % by weight, Ti content≤0.030 % by weight, V content≤0.030 % by weight, Nb content≤0.030 % by weight, Zr content≤0.020 % by weight; The C content of Fe-Mn alloy≤0.10 % by weight, S content≤0.020 % by weight, P content≤0.10 % by weight; The C content of steel scrap≤0.20 % by weight, S content≤0.020 % by weight, P content≤0.020 % by weight, Cr content≤0.10 % by weight, Ti content≤0.050 % by weight, V content≤0.050 % by weight, Nb content≤0.050 % by weight; The S content of quickened lime≤0.030 % by weight; The S content of fluorite≤0.10 % by weight; The S content of rhombspar≤0.020 % by 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 the compound per ton of molten iron and steel scrap, add quickened lime 40~50Kg, light dolomite 15~20kg, magnesium oxide ball 1.5~1.9Kg, fluorite 2~3kg and iron scale 1.5~2.5kg 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 % by weight, Mn<0.015 % by weight, P<0.010 % by weight, S<0.010 % by weight, O<1000 ppm by weight; Tapping temperature is 1650~1660 ℃;
C) carry out deoxidation in the aluminium that adds 8Kg * steel water oxygen % by weight ratio in the molten steel per ton in the tapping process; And according to the 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 rephosphorization of molten steel, 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 control tank, and the molten steel after the tapping enters ladle; Carry out Argon in the tapping process, tapping stopped Argon after 3 minutes;
D) ladle is sent into the RH vacuum oven and carried 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, make the Chemical Composition of molten steel satisfy following the requirement: C content is 0.025~0.055 % by weight; Si content is 2.9~3.3 % by weight; Mn content is 0.15~0.25 % by weight; Cu content is 0.45~0.63 % by weight; P content≤0.015 % by weight; S content is 0.07~0.018 % by weight; Als content is 0.008~0.032 % by weight; N content is 50~130 ppm by weight; O content≤20 ppm by weight; 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 with long nozzle in the casting cycle and carry out protective casting; The insulating covering agent that the covering slag that crystallizer 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 control cooling water inflow 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%; Carry out finish rolling after roughing is finished, 900~1080 ℃ of final rolling temperatures, draft are rolled into 2.2-2.5mm steel band more than or equal to 90%; By laminar flow cooling steel band being cooled to temperature is 550~600 ℃ and batches;
H) steel band after cooling is batched is removed the iron scale of steel strip surface by 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, after the uncoiling first the NaOH solution with 3~5% carry out the alkali cleaning degreasing, clean through water again, carry out carbonization treatment by entering decarburization annealing furnace after the hot-air drier drying afterwards, 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) recycling of the steel band after decarburizing annealing twenty-high rolling mill carries out secondary cold-rolling, 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 magnesium oxide unit, cleans through water again, by the hot-air drier drying, enters annealing furnace and carries out low-temperature annealing afterwards, and furnace atmosphere is N 2, H 2, H 2O, at steel strip surface coating one deck MgO, the drying bake oven is batched rolling after doing after the annealing;
M) be coated coil of strip behind the MgO and deliver to and carry out high temperature annealing in the high temperature bell-type furnace, furnace atmosphere is N 2, H 2, 1150-1200 ℃ of annealing temperatures, soaking time are 20~24 hours;
N) high temperature bell-type furnace coil of strip is out cleaned and coating insulating layer at stretching coating unit, then oven dry and annealed stove are annealed and stretching and leveling, and furnace atmosphere is N 2, H 2, temperature is 800~850 ℃ in the stove;
O) with after coil of strip carries out the shear removal defective after the stretching coating, the packing warehouse-in becomes the finished product.
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