CN103667874A - Production method for shortening furnace time of oriented silicon steel during high-temperature annealing period - Google Patents
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Abstract
The invention discloses a production method for shortening furnace time of oriented silicon steel during high-temperature annealing period. The production method comprises the following steps: (1) smelting; (2) performing hot rolling; (3) normalizing and pickling; (4) performing cold rolling; (5) decarburizing annealing; (6) performing high-temperature annealing; and (7) stretching, leveling and annealing. Formation of Goss texture and nucleation are promoted through cold rolling once or twice at high reduction rate, nitriding is performed at the earlier stage of high-temperature annealing, enough (Al,Si)N inclusion is formed, and development, stabilization and completion of secondary recrystallization are promoted by utilizing a strong inhibitory effect. Two steps are formed at a low-thermal insulation stage of high-temperature annealing, and homogenization of temperature inside steel coils is promoted. According to the two measures, the time period of the whole high-temperature annealing process is effectively shortened, the magnetism of the oriented silicon steel and the quality of the bottom layer of the surface magnesium silicate are stabilized and improved. Therefore, the production efficiency is improved, and the production cost is reduced.
Description
Technical field
The present invention relates to the production method of oriented silicon steel, specially refer to the production method that oriented silicon steel shortens time inside furnace during high temperature annealing.
Background technology
1, the production method of general cold-rolled orientation silicon steel is as follows traditionally:
(1), with converter (or electric furnace) steel-making, carry out vacuum-treat, composition refining and alloying, continuous casting becomes slab, its basic chemical composition is: Si (2.5～5.0), C (0.01～0.11), Mn (0.02～0.10), S (0.01～0.05), Als (0.01～0.05), N (0.003～0.015), some composition systems also contain one or more in the elements such as Mo, Sb, Cr, B, Bi, all the other are iron and inevitable impurity element, and product also may contain Cu sometimes;
(2), before slab hot rolling, in special heating furnace, be heated to the temperature of 1400 ℃ of left and right, and carry out above insulation in 30 minutes, make the abundant solid solution of favourable inclusion, to separate out Second Phase Particles tiny, disperse in silicon steel matrix in course of hot rolling subsequently---be inhibitor;
(3), after Hot Rolled Plate Normalizing (or not normalizing), carry out pickling, remove the iron scale of steel strip surface;
(4) (in traditional method, mostly general oriented silicon steel is cold rollingly just can roll finished product thickness with twice, by twice cold-rolling practice comprising process annealing, to roll finished product thickness, so need there is process annealing between cold rolling twice, only have the another kind of high magnetic induction grain-oriented silicon steel can be with a rolling);
(5), carry out decarburizing annealing and coating and take the annealing separating agent that magnesium oxide is main component, and the carbon in steel plate is taken off to the level of finished product magnetic that do not affect (generally should below 30ppm);
(6), in the process of high temperature annealing owing to being to anneal during whole coil of strip packs bell furnace into, so even in order to guarantee in coil of strip temperature everywhere, need slow heat-up rate and long soaking time.In high-temperature annealing process, occur successively: MgSiO
4the formation reaction of bottom (magnesium oxide of coating and the silicon dioxde reaction of surface of steel plate generate), the generation of secondary recrystallization, growth and growth, (this stage is the final stage in high-temperature annealing process part to purify steel, element except iron and silicon in silicon steel is removed totally as much as possible, be included in oriented silicon steel production process above as favourable be mingled with protected and before secondary recrystallization occurs as the compositions such as N, S of inhibitor integral part) physical-chemical reaction, obtain the cold-rolled orientation silicon steel that orientation degree is high, iron loss is low; The high temperature annealing of oriented silicon steel has two features: the one, and the time cycle is very long---from coil of strip shove charge, to coming out of the stove, reach about 5 days, and its low temperature holding stage only has a temperature step; The 2nd, temperature is very high---can reach 1200 ℃ of left and right, so not only production efficiency is lower but also be the operation consuming energy most for high temperature annealing.
(7), at steel strip surface coating insulating coating and carry out stretching and leveling annealing, obtain the oriented silicon steel of commercial applications form.
2, the distinguishing feature of the production method of the general cold-rolled orientation silicon steel of tradition has:
(1), inhibitor starts just to form from steel-making, in each operation, to adjust it, control subsequently, owing to carrying out successively middle inhibitor in each operation, lose, must made up by rights, to play a role to crucial moment, after having acted on, to from steel, remove;
(2) the slab heat, before hot rolling, Heating temperature, up to 1400 ℃ of left and right, is the Limiting Level of general process furnace, it is also the limit of existing hot rolling technology that the cooling of hot-rolling line is controlled;
(3), the key of production technology is to control tissue, the texture of each stage steel plate of each operation, and the form of inhibitor, quantity and behavior;
(4), because slab heating temperature is high, process furnace needs frequent repairing, utilising efficiency is low, steel billet scaling loss is large simultaneously, energy consumption is high, hot rolling crimping splits greatly, causes cold rolling process to be produced difficult, lumber recovery is low, comprehensive cost is high;
(5), time of high temperature annealing is long, temperature is high, at its low holding stage, only has an insulation step, has limited the raising of its output and the lifting of quality, and energy consumption is very high during the high temperature annealing of oriented steel.
3, relevant improvement and patented technology
In order to address these problems, in long-term production practice and in research work, people grope and have developed some successful ways, are now summarized as follows:
(1), the method of introducing in Japanese patent laid-open 5-112827, its chemical composition is: [C] 0.025～0.075%, Si2.90～4.50%, S≤0.012%, Als0.010～0.060%, N≤0.010%, Mn0.08～0.45%, P0.015～0.045%, all the other are Fe and inevitable inclusion, after 1200 ℃ of following heating of slab, carry out hot rolling, just time cold rolling or be rolled down to final finished thickness with more than twice method of process annealing with one, after decarburizing annealing, steel band carries out continuous nitriding in traveling process, after being coated with magnesium oxide separant, carry out high temperature annealing, the all good oriented silicon steels of production magnetic and bottom layer quality.Continuous nitriding method: protective atmosphere is the mixed gas of hydrogen and nitrogen, wherein NH
3content is more than 1000ppm, and oxygen gesture is that PH2O/PH2≤0.04 nitriding temperature is 500～900 ℃.
(2), Korea S POSCO Co., Ltd., its low-temperature oriented silicon steel chemical composition is: [C] 0.020～0.045%, Si2.90～3.30%, S≤0.006%, Als0.005～0.019%, N0.003～0.008%, Mn0.05～0.30%, Cu0.30～0.70%, Ni0.30～0.70%, Cr0.30～0.70%, all the other are Fe and inevitable impurity, in addition, in steel, contain B0.001～0.012%.Decarburization and nitriding are carried out simultaneously, nitriding in wet atmosphere.The basis of the method is to take BN as main inhibitor.
(3), the patent of Chinese Baosteel application method as described in ZL200410099080.7 and CN101768697A is before decarburization that nitriding or decarburization and high temperature annealing two-step all need nitriding simultaneously.
By inquiry and analysis to the patent of the domestic and international producing oriented silicon steel by heating low temperature casting blank based on nitridation process, document etc., can find: because the mode of low temperature heating of plate blank causes in silicon strip when original inhibitor has arrived 1000 ℃ of left and right of high-temperature annealing, seem inadequate, must by nitriding, be supplemented rear operation (must be before 1020 ℃ of high temperature annealings), namely increased (Al, Si) N novel inhibitors.But the process of nitriding can not have impact to the formation reaction of Magnesium Silicate q-agent bottom again, it is simple can guarantee the stable and even of nitriding that the process of nitriding is wanted, and everything is all to guarantee that cold-rolled orientation silicon steel has the primary condition of good magnetic and surperficial Magnesium Silicate q-agent bottom, the present invention solves these problems preferably.
Summary of the invention
The object of the present invention is to provide a kind of use method that once (or twice) cold-rolling practice is produced general cold-rolled orientation silicon steel, by carrying out Hot Rolled Plate Normalizing annealing process, utilize finished product thickness coil of strip to carry out high-temperature when annealing at bell furnace two holding stages are set during at lesser temps, the homogenizing that is conducive to temperature in coil of strip, special time period nitriding before while steel band final magnetic behavior when high temperature annealing forms, to form enough (Al, Si) N is favourable is mingled with, utilize its restraining effect to primary recrystallization crystal grain, impel growing up of secondary recrystallization crystal grain, grow with perfect, be conducive to obtain good finished product magnetic and good Magnesium Silicate q-agent bottom.Overcome and in other patent, used the detrimentally affect of ammonia nitriding to Magnesium Silicate q-agent bottom, overcome in decarburizing annealing and this two-step of high temperature annealing simultaneously and all needed nitriding to bring being difficult in operation and in nitriding amount to control, so not only shortened the high temperature annealing cycle but also guaranteed completing of high temperature annealing function.
In order to achieve the above object, technical scheme of the present invention is:
The production method that oriented silicon steel shortens time inside furnace, raises the efficiency during high temperature annealing, comprises the steps:
(1), smelt
With converter (or electric furnace), make steel, molten steel is carried out to vacuum-treat, composition refining and Alloying Treatment, then continuous casting becomes slab, its basic chemical composition is: Si (2.5～5.0), C (0.01～0.11), Mn (0.02～0.10), S (0.01～々 0.05), Als (0.01～0.05), N (0.003～0.015), some composition systems also contain Mo, Sb, Cr, etc. one or more in element, all the other are iron and inevitable impurity element, and this product is generally containing Cu;
(2), hot rolling
Before slab hot rolling, in silicon steel special heating furnace, be heated to the temperature of 1200 ℃ of left and right, and carry out above insulation in 30 minutes, make the abundant solid solution of favourable inclusion, to separate out Second Phase Particles tiny, disperse in silicon steel matrix in course of hot rolling subsequently---be inhibitor;
Adopt low temperature heating of plate blank, the Heating temperature of directional silicon steel slab is 1200 ℃ of left and right, and to be that hot rolled coil is boundless split its advantage, and productivity is good, process furnace long service life, and silicon steel lumber recovery is high; Its shortcoming is that favourable to be mingled with solid solution abundant not, and the amount of inhibitor is effectively supplemented by oozing N in rear operation;
(3), normalizing adds pickling
Hot Rolled Plate Normalizing is annealed and is carried out pickling, removes the iron scale of steel strip surface; Normalizing annealing temperature: 1050～1185 ℃ of (1～20s)+850～980 ℃ (30～180s), speed of cooling: 60 ℃/s～10 ℃/s; Acid washing conditions: pickling in the hydrochloric acid soln of 5% left and right;
(4), cold rolling
By (or twice) cold-rolling practice once, directly from hot-rolled sheet thickness, roll finished product thickness, cold rolling draft >=82%.Heavy reduction rate significantly increases the dislocation desity in steel band interior tissue, the a large amount of dislocations and the goss texture that produce, the forming core that is conducive to Gauss's nucleus, as long as there are enough favourable existence that is mingled with when high temperature annealing operation secondary recrystallization occurs, these Gauss's nucleus just can develop into perfect secondary recrystallization;
(5), decarburizing annealing
To rolling the silicon strip of finished product thickness, carry out decarburizing annealing and coating and take the annealing separating agent that magnesium oxide is main component, decarburization temperature controlling range: 750～890 ℃, protective atmosphere is hydrogen, nitrogen mixture gas, and H2 content accounts for 15～80%, 25～75 ℃ of protective atmosphere dew points; Decarburization time: 90～350 seconds, and the carbon in steel plate is taken off to the level of finished product magnetic that do not affect (generally should below 30ppm); The de-total oxygen of steel strip surface [0]: 170/t≤[0]≤315/t (t is steel band actual (real) thickness mm);
(6), high temperature annealing
(first is 600 ℃ of < in high temperature annealing operation, to adopt two steps, second 700 ℃ of <) low temperature insulation and only have the soak (purification steel) of a step, at the low temperature holding stage of second step with in being warmed up to the process before 1020 ℃, in stove, adopt pure N
2gas is made shielding gas, and steel band is carried out to nitriding, the dew point requirement of logical people's purity nitrogen≤-60 ℃, and the dew point of furnace atmosphere requires≤30 ℃; Strengthening above condition is in order to improve the effect of high temperature annealing, makes oriented steel be able to complete with reacting of surface quality and carry out rapidly in several superperformances that can form in high temperature annealing stage, reaches to realize to shorten the whole high temperature annealing cycle.
In high-temperature annealing process, occur successively: MgSiO
4the formation reaction of bottom (magnesium oxide of coating and the silicon dioxde reaction of surface of steel plate generate), the generation of secondary recrystallization, growth and growth, (this stage is the final stage in high-temperature annealing process part to purify steel, element except iron and silicon in silicon steel is removed totally as much as possible, be included in oriented silicon steel production process above as favourable be mingled with protected and before secondary recrystallization occurs as the compositions such as N, S of inhibitor integral part) physical-chemical reaction, obtain the cold-rolled orientation silicon steel that orientation degree is high, iron loss is low;
(7), stretching and leveling annealing
Stretching and leveling annealing process routinely carries out.
The remarkable advantage of the inventive method:
(1), cold-rolled orientation silicon steel on the basis in above-mentioned basal component, in steel, also can add B0.01～0.10% and/or Bi≤0.2%, calculate by percentage to the quality.
(2), adopt low temperature heating of plate blank, the Heating temperature of directional silicon steel slab is 1200 ℃ of left and right, to be that hot rolled coil is boundless split its advantage, productivity is good, process furnace long service life, silicon steel lumber recovery is high; Its shortcoming is that favourable to be mingled with solid solution abundant not, and the amount of inhibitor need to be supplemented by oozing N in rear operation;
(3), by (or twice) cold-rolling practice once, directly from hot-rolled sheet thickness, roll finished product thickness, heavy reduction rate significantly increases the dislocation desity in steel band interior tissue, the a large amount of dislocations that produce and the formation that is conducive to goss texture, the forming core that is conducive to Gauss's nucleus, when high temperature annealing operation secondary recrystallization occurs, had enough favourable existence that is mingled with, this just can develop into perfect (110) [001] secondary recrystallization tissue;
(4), the feature of nitriding is here directly with purity nitrogen, to ooze, not to carry out nitriding (having avoided the many disadvantageous effects with ammonia nitriding) with ammonia, in the high temperature annealing stage, under the prerequisite that does not increase total annealing cycle, increase a low temperature insulation step, second low holding stage and 1020 ℃ of temperature rise periods before form logical purity nitrogen nitriding, this role of respective stage while still having played high temperature annealing in nitriding; The nitriding here neither carry out nitriding with hydrogen, nitrogen mixture gas as the patent Introduction having, but with purity nitrogen, neither, in decarburizing annealing and high temperature annealing nitriding simultaneously, only at high temperature annealing, in earlier stage carry out.The opportunity of nitriding, nitriding amount etc. are all only for an object---and strengthening inhibitor is in secondary recrystallization stage performance effect fully, so in advance little in operation nitriding role above.After secondary recrystallization body completes, the historic mission of inhibitor also just completes, and now its effect in oriented silicon steel is from changing into harmful being mingled with original favourable being mingled with.Because in oriented silicon steel finished product, except iron and silicon, other elements all have inhibition to magnetic history more or less in existence, so unfavorable to the magnetic of material.And in oriented silicon steel, to have the elements such as a certain amount of carbon, manganese, sulphur, aluminium in steel-making, this is the needs for middle Working Procedure Controlling---its object only has one: develop and improve secondary recrystallization---, and this is that cold-rolled orientation silicon steel is peculiar, is also the why good reason of magnetic of oriented silicon steel.
(5) (first is 600 ℃ of <, in high temperature annealing operation, to adopt two steps, second 700 ℃ of <) low temperature insulation and the soak (purification steel) of a step be extremely conducive to like this in coil of strip the actual temperature homogenizing of steel band everywhere, the low temperature holding stage of second step be warmed up to the process before 1020 ℃ in adopt pure N in stove
2gas is made shielding gas, and steel band is carried out to nitriding, the dew point requirement of logical people's purity nitrogen≤-60 ℃, and the dew point of furnace atmosphere requires≤30 ℃; Integral high-temperature degree annealing time can shorten 6～9 hours on original basis, and the throughput of high temperature annealing operation can improve 10% left and right;
(6), the object of now nitriding is the amount that increases inhibitor, make to have in steel band sufficient amount favourable be mingled with to protect be about to or ongoing secondary recrystallization completes smoothly and grows perfect, inhibitor just forms when steel-making, in hot rolling and change form and lose in each operation subsequently, need suitably to supplement, this role of nitriding is constantly exactly first complete inhibitor (Al, Si) N etc., so that improve secondary recrystallization;
Embodiment
Embodiment mono-:
1, with 500 kilograms of vacuum ovens according to the ultimate constituent steel-making of table 1, and hot-rolled condition is as table 2:
Table 1, experimental steel steel-making composition (%)
| Composition | C | Si | Mn | P | S | Als | N | Sn | Remarks |
| A | 0.059 | 3.25 | 0.15 | 0.022 | 0.015 | 0.026 | 0.049 | 0.018 | ? |
| B | 0.048 | 3.02 | 0.16 | 0.019 | 0.011 | 0.018 | 0.005 | 0.022 | ? |
Table 2, experimental steel hot-rolled condition (℃)
| Project | Heating temperature | Finishing temperature | Coiling temperature | Thickness (mm) | Remarks |
| C | 1190 | 900 | 510 | 2.20 | ? |
| D | 1295 | 950 | 535 | 2.20 | Make comparisons |
1, normalizing condition is: 1120 ℃ * 5s+900 ℃ * 60s+50 ℃/s's is cooling;
2, cold rolling band steel is to 0.30mm, carries out high temperature annealing and stretching and leveling annealing (containing being coated with insulation layer) after decarburization and coating MgO separant, measures magnetic, and experimental result is as table 3:
Table 3, experimental result
| Project | B8(T) | P17/50(w/kg) | Remarks |
| AC | 1.88 | 1.13 | Example |
| AD | 1.81 | 1.38 | Comparative example |
| BC | 1.87 | 1.16 | Example |
| BD | 1.79 | 1.52 | Comparative example |
Embodiment bis-:
With the A composition in the middle of above-mentioned table 1 and the C hot-rolled condition steel in table 2, carry out the nitriding experiment in early stage in high temperature annealing stage; through normalizing annealing, cold rolling, decarburizing annealing, when high temperature annealing stage low insulation, the soaking time (have direct contribution and can guarantee functional shortening the high temperature annealing cycle herein) of second step is, the dew point of atmosphere is as shown in table 4 on the impact of magnetic.
The relation of table 4, atmosphere, time and dew point and magnetic
The production method of general oriented silicon steel is all the mode that adopts slab heat for a long time, slab heating temperature is up to 1400 ℃ of left and right, make the favourable abundant solid solution that is mingled with, and in course of hot rolling, obtain favourable disperse distribution and the reasonable size being mingled with, when high temperature annealing, suppress primary recrystallization crystal grain, obtain good secondary recrystallization tissue.The shortcoming of this production method is: (1), must have special-purpose high-temperature heater, due to heat, steel slab surface slag is serious, and process furnace is easily damaged, and maintenance cost is high, operating rate is low;
(2), in order to make heating of plate blank even, must long-time heating, energy consumption is high;
(3), the temperature of high temperature annealing is high, the time cycle long, operation productivity is poor, causes steel band crimping to make lumber recovery low, energy consumption is high, production cost is high.
Method of the present invention has solved the problems referred to above effectively, and with Japan, the method of the states such as Korea S and comparing with the method for domestic Baosteel etc., the present invention is by the dislocation desity in once (or twice) cold rolling raising steel strip substrate of heavy reduction, be conducive to the formation of goss texture, and by purity nitrogen, carry out nitriding in the high temperature annealing stage, make to form in steel band (the Al of increase, Si) N, add MnS in steel band etc., what make sufficient amount is favourablely mingled with effective inhibition primary recrystallization tissue, stable to obtaining, perfect secondary recrystallization is organized highly beneficial, so just effectively improved the function of high temperature annealing.Present method, only in abundant nitriding in the early stage of high temperature annealing, does not adopt nitriding multiple operation, special to process simultaneously, does not need nitriding device, to the formation of good Magnesium Silicate q-agent bottom, very favourable to the raising of oriented silicon steel finished product magnetic.Integral high-temperature degree annealing time can shorten 6～9 hours on original basis, and the throughput of high temperature annealing operation can improve 10% left and right; Shorten the technology in high temperature annealing cycle and produce the developing direction that oriented silicon steel has represented oriented silicon steel,, the facilities and equipments of the inventive method are the conventional equipment of producing oriented silicon steel, and enforcement technology is simple.Thereby there is good popularizing application prospect.
Claims (6)
1. oriented silicon steel shortens the production method of time inside furnace during high temperature annealing,
Comprise the steps:
(1), smelt
With converter (or electric furnace), make steel, molten steel is carried out to vacuum-treat, composition refining and Alloying Treatment, then continuous casting becomes slab, its basic chemical composition is: Si (2.5～5.0), C (0.01～0.11), Mn (0.02～0.10), S (0.01～0.05), Als (0.01～0.05), N (0.003～0.015), some composition systems also contain Mo, Sb, Cr, etc. one or more in element, all the other are iron and inevitable impurity element, and this product can contain a small amount of Cu;
(2), hot rolling
Before slab hot rolling, in silicon steel special heating furnace, be heated to the temperature of 1200 ℃ of left and right, and carry out above insulation in 50 minutes, make the abundant solid solution of favourable inclusion, to separate out Second Phase Particles tiny, disperse in silicon steel matrix in course of hot rolling subsequently---be inhibitor;
Adopt low temperature heating of plate blank, the Heating temperature of directional silicon steel slab is 1200 ℃ of left and right, and to be that hot rolled coil is boundless split its advantage, and productivity is good, process furnace long service life, and silicon steel lumber recovery is high; Its shortcoming is that favourable to be mingled with solid solution abundant not, and the amount of inhibitor is effectively supplemented by oozing N in rear operation;
(3), normalizing adds pickling
Hot Rolled Plate Normalizing is annealed and is carried out pickling, removes the iron scale of steel strip surface; Normalizing annealing temperature: 1050～1185 ℃ of (1～20s)+850～980 ℃ (30～180s), speed of cooling: 60 ℃/s～10 ℃/s; Acid washing conditions: pickling in the hydrochloric acid soln of 5% left and right;
(4), cold rolling
By once cold rolling method (or twice), directly from hot-rolled sheet thickness, roll finished product thickness, cold rolling draft >=82%.Heavy reduction rate significantly increases the dislocation desity in steel band interior tissue, the a large amount of dislocations and the goss texture that produce, the forming core that is conducive to Gauss's nucleus, as long as there are enough favourable existence that is mingled with when high temperature annealing operation secondary recrystallization occurs, these Gauss's nucleus just can develop into perfect secondary recrystallization;
(5), decarburizing annealing
To rolling the silicon strip of finished product thickness, carry out decarburizing annealing and coating and take the annealing separating agent that magnesium oxide is main component, decarburization temperature controlling range: 750～890 ℃, protective atmosphere is hydrogen, nitrogen mixture gas, and H2 content accounts for 15～80%, 25～75 ℃ of protective atmosphere dew points; Decarburization time: 90～350 seconds, and the carbon in steel plate is taken off to the level of finished product magnetic that do not affect (generally should below 30ppm); The de-total oxygen of steel strip surface [0]: 160/t≤[0]≤325/t (t is steel band actual (real) thickness mm);
(6), high temperature annealing
(first is 600 ℃ of < in high temperature annealing operation, to adopt two steps, second 700 ℃ of <) low temperature insulation and only have high temperature (1160 ℃ of the >) insulation (purification steel) of a step, at the low temperature holding stage of second step with in being warmed up to the process before 1020 ℃, in stove, adopt pure N
2gas is made shielding gas, and steel band is carried out to nitriding, the dew point requirement of logical people's purity nitrogen≤-60 ℃, and the dew point of furnace atmosphere requires≤30 ℃; Improve thus the effect of high temperature annealing, make oriented steel be able to complete with reacting of surface quality and carry out rapidly in several superperformances that can form in high temperature annealing stage, thereby realize, shorten the whole high temperature annealing cycle;
In high-temperature annealing process, occur successively: MgSiO
4the formation reaction of bottom (magnesium oxide of coating and the silicon dioxde reaction of surface of steel plate generate), the generation of secondary recrystallization, growth and growth, (this stage is the final stage in high-temperature annealing process part to purify steel, element except iron and silicon in silicon steel is removed totally as much as possible, be included in oriented silicon steel production process above as favourable be mingled with protected and before secondary recrystallization occurs as the compositions such as N, S of inhibitor integral part) physical-chemical reaction, obtain the cold-rolled orientation silicon steel that orientation degree is high, iron loss is low;
(7), stretching and leveling annealing
Stretching and leveling annealing process routinely carries out.
2. oriented silicon steel as claimed in claim 1 shortens the production method of time inside furnace during high temperature annealing, it is characterized in that: cold-rolled orientation silicon steel is on the basis in above-mentioned basal component, in steel, also can add B0.01～0.10% and/or Bi≤0.2%, calculate by percentage to the quality.
3. the production method that oriented silicon steel as claimed in claim 1 shortens time inside furnace, raises the efficiency during high temperature annealing, it is characterized in that: adopt low temperature heating of plate blank, the Heating temperature of directional silicon steel slab is 1200 ℃ of left and right, to be that hot rolled coil is boundless split its advantage, productivity is good, process furnace long service life, silicon steel lumber recovery is high; Its shortcoming is that favourable to be mingled with solid solution abundant not, and the amount of inhibitor is effectively supplemented by oozing N in rear operation.
4. oriented silicon steel as claimed in claim 1 shortens the production method of time inside furnace during high temperature annealing, it is characterized in that: by (or twice) cold-rolling practice once, directly from hot-rolled sheet thickness, roll finished product thickness, its >=82% heavy reduction rate significantly increases the dislocation desity in steel band interior tissue, the a large amount of dislocations that produce and the formation that is conducive to goss texture, the forming core that is conducive to Gauss's nucleus, when high temperature annealing operation secondary recrystallization occurs, had enough favourable existence that is mingled with, this just can develop into perfect (110) [001] secondary recrystallization tissue.
5. oriented silicon steel as claimed in claim 1 shortens the production method of time inside furnace during high temperature annealing, its principal character is: when the last stage of high temperature annealing, include nitriding, the feature of nitriding is here directly with purity nitrogen, to ooze, not to carry out nitriding (having avoided the many disadvantageous effects with ammonia nitriding) with ammonia, in the high temperature annealing stage, in the situation that shortening total annealing cycle, increase a low temperature insulation step, always have two low holding stages; Second low holding stage and 1020 ℃ of temperature rise periods before form logical purity nitrogen nitriding, this role of respective stage while still having played high temperature annealing in nitriding; The nitriding here neither carry out nitriding with hydrogen, nitrogen mixture gas as the enterprise having, but with purity nitrogen, the opportunity of nitriding, nitriding amount etc. are all only for an object---and strengthening inhibitor is in secondary recrystallization stage performance effect fully.After secondary recrystallization body completes, the historic mission of inhibitor also just completes, and now its effect in oriented silicon steel is from changing into harmful being mingled with original favourable being mingled with.Because in oriented silicon steel finished product, except iron and silicon, other elements all have inhibition to magnetic history more or less in existence, so unfavorable to the magnetic of material.And in oriented silicon steel, to have the elements such as a certain amount of carbon, manganese, sulphur, aluminium in steel-making, this is the needs for middle Working Procedure Controlling---its object only has one: develop and improve secondary recrystallization---, and this is that cold-rolled orientation silicon steel is peculiar, is also the magnetic reason why what is better of oriented silicon steel.
6. oriented silicon steel as claimed in claim 1 shortens the production method of time inside furnace during high temperature annealing, it is characterized in that: (first is 600 ℃ of < at high temperature annealing operation low temperature holding stage, to adopt two steps, second 700 ℃ of <) low temperature insulation, can improve like this temperature homogeneity of coil of strip in stove, for annealing cycle shortening creates conditions.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112617A (en) * | 2015-09-25 | 2015-12-02 | 包头市威丰电磁材料有限责任公司 | Novel high-temperature annealing process of cold-rolled oriented silicone steel |
| CN105714039A (en) * | 2016-05-04 | 2016-06-29 | 华北理工大学 | Annealing process of niobium-containing low-temperature oriented silicon steel and control method thereof |
| CN110318005A (en) * | 2018-03-30 | 2019-10-11 | 宝山钢铁股份有限公司 | A kind of high magnetic induction grain-oriented silicon steel and its manufacturing method |
| CN112981070A (en) * | 2021-02-09 | 2021-06-18 | 鞍钢股份有限公司 | Method for producing oriented silicon steel without pickling after normalization |
| CN114453430A (en) * | 2022-01-20 | 2022-05-10 | 安阳钢铁股份有限公司 | Control method for preventing high magnetic induction oriented silicon steel cold rolling strip breakage |
| CN115478145A (en) * | 2022-09-24 | 2022-12-16 | 新万鑫（福建）精密薄板有限公司 | Method for improving magnetic uniformity and production efficiency of oriented silicon steel |
| CN115838848A (en) * | 2022-09-30 | 2023-03-24 | 无锡普天铁心股份有限公司 | High-temperature annealing bottom plate for improving surface quality of oriented silicon steel |
| CN116121622A (en) * | 2022-11-18 | 2023-05-16 | 无锡普天铁心股份有限公司 | Production process of excellent bottom layer oriented silicon steel |
| CN114921711B (en) * | 2022-05-25 | 2023-10-24 | 湖南华菱湘潭钢铁有限公司 | Production method of Q620-grade high-corrosion-resistance high-strength offshore structural steel |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105112617A (en) * | 2015-09-25 | 2015-12-02 | 包头市威丰电磁材料有限责任公司 | Novel high-temperature annealing process of cold-rolled oriented silicone steel |
| CN105714039A (en) * | 2016-05-04 | 2016-06-29 | 华北理工大学 | Annealing process of niobium-containing low-temperature oriented silicon steel and control method thereof |
| CN110318005A (en) * | 2018-03-30 | 2019-10-11 | 宝山钢铁股份有限公司 | A kind of high magnetic induction grain-oriented silicon steel and its manufacturing method |
| CN110318005B (en) * | 2018-03-30 | 2021-12-17 | 宝山钢铁股份有限公司 | High magnetic induction oriented silicon steel and manufacturing method thereof |
| CN112981070A (en) * | 2021-02-09 | 2021-06-18 | 鞍钢股份有限公司 | Method for producing oriented silicon steel without pickling after normalization |
| CN114453430A (en) * | 2022-01-20 | 2022-05-10 | 安阳钢铁股份有限公司 | Control method for preventing high magnetic induction oriented silicon steel cold rolling strip breakage |
| CN114921711B (en) * | 2022-05-25 | 2023-10-24 | 湖南华菱湘潭钢铁有限公司 | Production method of Q620-grade high-corrosion-resistance high-strength offshore structural steel |
| CN115478145A (en) * | 2022-09-24 | 2022-12-16 | 新万鑫（福建）精密薄板有限公司 | Method for improving magnetic uniformity and production efficiency of oriented silicon steel |
| CN115478145B (en) * | 2022-09-24 | 2024-05-24 | 新万鑫（福建）精密薄板有限公司 | Method for improving magnetic uniformity and production efficiency of oriented silicon steel |
| CN115838848A (en) * | 2022-09-30 | 2023-03-24 | 无锡普天铁心股份有限公司 | High-temperature annealing bottom plate for improving surface quality of oriented silicon steel |
| CN115838848B (en) * | 2022-09-30 | 2023-09-08 | 无锡普天铁心股份有限公司 | High-temperature annealing bottom plate for improving surface quality of oriented silicon steel |
| CN116121622A (en) * | 2022-11-18 | 2023-05-16 | 无锡普天铁心股份有限公司 | Production process of excellent bottom layer oriented silicon steel |
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