CN101775548A - Method for producing low nitriding amount and high magnetic induction oriented silicon steel strip - Google Patents
Method for producing low nitriding amount and high magnetic induction oriented silicon steel strip Download PDFInfo
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- CN101775548A CN101775548A CN200910273460A CN200910273460A CN101775548A CN 101775548 A CN101775548 A CN 101775548A CN 200910273460 A CN200910273460 A CN 200910273460A CN 200910273460 A CN200910273460 A CN 200910273460A CN 101775548 A CN101775548 A CN 101775548A
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Abstract
The invention discloses a method for producing a low nitriding amount and high magnetic induction oriented silicon steel strip, which comprises the procedures of controlling chemical components in a continuous casting blank, heating to 1,100-1,200 DEG C, hot rolling to form a hot-rolling steel strip with the thickness of 2.0-2.5mm, carrying out two-section normalizing annealing, coldly rolling to form a cold-rolling steel strip with the thickness of 0.23-0.30mm once, and carrying out continuous decarburization processing, continuous nitridation processing and secondary recrystallization annealing processing, conventionally cooling, and the like. In the procedure of the continuous nitridation processing, the N in the cold-rolling steel strip is controlled to be 0.0095-0.0150 in percentage by weight; in the procedure of the secondary recrystallization annealing processing, when the steel strip is heated to 750-1,100 DEG C, the volume rate of N2 is controlled to be 75-90 percent relative to the total volume rate of the N2-H2 atmosphere; and finally, the low nitriding amount and high magnetic induction oriented silicon steel strip is prepared. The invention has proper heat treatment temperature on a plate blank, low manufacture cost and high product quality and can meet the requirements of the high-quality oriented silicon steel for an iron core of a transformer.
Description
Technical field
The present invention relates to the oriented silicon steel manufacturing technology, refer to a kind of production method that is mainly used in the low nitriding amount and high magnetic induction oriented silicon steel strip of transformer core particularly.
Background technology
Transformer core mainly is made up of the oriented silicon steel lamination, and lamination cuts along the rolling direction of oriented silicon steel band, and forms a loop checking installation.The working forms of transformer itself is that primary current is responded to formation magnetic flux in iron core, and magnetic flux produces electric current in secondary coil, thereby realizes the transition function of electricity-magnetic-electricity.In magnetic parameter, magneticflux-density represents that with B unit is T; Iron loss under given frequency and magneticflux-density condition represents that with P unit is W/Kg.The oriented silicon steel sheet is divided into two classes usually: promptly general oriented silicon steel sheet (CGO) and high magnetic effect orientating-sensitive sheet (HGO), and its basic difference is the size of magnetic induction or magneticflux-density, it is to be observed value under the 800A/m condition in magnetic field, indicates symbol B
800The B of general oriented silicon steel sheet (CGO)
800Parameter is no more than 1.880T usually, the B of high magnetic effect orientating-sensitive sheet (HGO)
800Parameter then surpasses 1.890T.
As everyone knows, the production process of grain oriented silicon steel sheet comprises the thermal treatment link under a large amount of high temperature, when some crystal grain can begin to grow up, if the mode that it is grown up is improper, will can not get required net result.The grain orientation of the finished product obtains by secondary recrystallization annealing, and the quantity of final crystal grain and orientation depend on the correlation parameter in the certain limit.The quality of secondary recrystallization is controlled by the inhibitor in the steel, as manganese sulfide, manganese selenide, aluminium nitride etc., when they can suppress growing up of a crystal grain when disperse distributes in steel, thereby generation secondary recrystallization, the solvent temperature of these inhibitor is high more, the ability of its control grain growth is good more, and the quality of the finished product is just good more.
General oriented silicon steel sheet mainly uses manganese sulfide as inhibitor, but high magnetic effect orientating-sensitive sheet is made inhibitor with aluminium nitride or aluminium nitride+manganese sulfide basically.In the prior art, adopting slab low-temperature heat hot rolling technology to produce high magnetic induction grain-oriented silicon steel mainly is to obtain by the nitriding amount of control steel band and the atmosphere in the control high-temperature annealing process.In patent application document in the past, the production method that some relate to nitriding after the decarburizing annealing has been proposed, mainly contain: 1, in the magnesium oxide separant, add nitride, decompose the nitriding method that produces active nitrogen by nitride at a certain temperature; 2, (also can simultaneously) utilizes ammonia to produce the gas nitriding process of active nitrogen after decarburizing annealing.In gas nitriding process, can be divided into two kinds of high temperature nitriding (900～1050 ℃ of temperature) and low temperature nitridings (650～800 ℃ of temperature) again.The feature and the deficiency thereof of the typical nitriding method that is provided in following introductory section Europe and the american documentation literature:
(Si, Al) favourable being mingled with as inhibitor of N produces secondary recrystallization to EP0219611B1 by using.The principal character of this method is in process of production steel band to be carried out nitriding treatment, to adjust the content of nitrogen in steel.It adds the nitrogen mode and carries out nitriding for add nitrogenized manganese in magnesium oxide, but this nitriding method makes the nitrogen skewness in the steel band.
US4979996 has proposed a kind of gas nitriding process, finishes nitriding in the steel before the secondary recrystallization annealing beginning, and nitrogen content is at least more than 180ppm in the steel.This method nitriding amount of this method is higher, is unfavorable for saving production cost, and the oriented silicon steel bottom easily produced point-like and leaks golden defective when simultaneously the nitriding amount was high.
EP0922119B1 relates to the method for producing high magnetic induction grain-oriented silicon steel strip with sheet blank continuous casting, this method has been avoided harsh processing requirement, its slab thickness is controlled at 50～60mm, cold-rolled steel strip continuous annealing nitriding treatment temp is controlled at 900～1050 ℃, and vapour content is controlled at 0.5～100g/m in the nitriding atmosphere
3, the silicon plate that can obtain to have special solidified structure and microtexture.But this method nitriding treatment temp is too high, is unfavorable for saving production cost, and this method is mainly used in sheet blank continuous casting production simultaneously.
EP0950118B1 has proposed a kind of method of continuously cast bloom production oriented steel, and its continuous blank heating temperature is 1250～1300 ℃, nitriding annealing continuously after the decarburization, and the nitriding annealing temperature is 900～1050 ℃, adopts the contain NH of nitrogen hydrogen for base in the stove
3Atmosphere, NH
3Content is per kilogram steel band 1～35 standard liter, and water vapour content is 0.5～100g/m
3But this method can only obtain the lower general oriented silicon steel sheet (CGO) of magnetic property quality, can not obtain the oriented silicon steel of high magnetic strength.
EP0950120B1 by 1100～1320 ℃, preferably the temperature between 1270～1310 ℃ is carried out equal thermal treatment to continuously cast bloom, adopt to be higher than 950 ℃ nitridation process.Equally, the hot rolling slab Heating temperature height that this method adopts, the nitriding treatment temp is also high, is unfavorable for saving production cost.
In addition, when in the prior art steel band being carried out continuous nitriding anneal, at N
2-H
2H in the atmosphere
2Ratio usually require greater than 50% N during high temperature nitriding annealing
2-H
2Atmosphere is mainly by 25% N
2+ 75% H
2Constitute H
2Cost apparently higher than N
2Cost, also corresponding the increasing of cost that causes whole production technology.
Summary of the invention
Purpose of the present invention be exactly to provide that a kind of slab thermal treatment temp is lower, the production method of technological process is easy to control, production cost is low low nitriding amount and high magnetic induction oriented silicon steel strip, to satisfy the needs of producing high-quality oriented silicon steel.
For achieving the above object, the present invention is directed to nitridation process further investigation, thereby proposed in gas nitriding, to adopt lower nitriding amount and cooperated the solution of the higher nitrogen ratios acquisition high-quality oriented silicon steel of employings in the secondary recrystallization annealing process.The production method of designed low nitriding amount and high magnetic induction oriented silicon steel strip comprises the steps:
1) in the continuous casting of molten steel operation control prepared continuously cast bloom chemical ingredients by weight percentage ratio count: C:0.030～0.060, Si:2.50～3.50, Al
Sol(sour molten aluminium): 0.020～0.045, N:0.005～0.009, Cu:0.050～0.100, Sn:0.050～0.150, Mn:0.070～0.150, S:0.003～0.010, Cr:0.020～0.200, P:0.010～0.020, Ti:0.002～0.003, all the other inevitably are mingled with for Fe reaches;
2) prepared continuously cast bloom is heated to 1100～1200 ℃ and carries out hot rolling, be rolled into the hot rolled strip that thickness is 2.0～2.5mm, the coiling temperature of hot rolled strip is controlled at 550～700 ℃;
3) adopt second stage annealing normalizing operation that the hot rolled strip that is obtained is handled, the Heating temperature of first section annealing normalizing operation is 1000～1120 ℃, and soaking time is 1～3min; The Heating temperature of second section annealing normalizing operation is 900～950 ℃, and soaking time is 1～3min;
4) will be cooled to below 60 ℃ or room temperature through the hot rolled strip that second stage annealing normalizing operation is handled, and adopt the once cold rolling method that it is rolled into the cold-rolled steel strip that thickness is 0.23～0.30mm after the pickling;
5) at wet N
2-H
2In the atmosphere cold-rolled steel strip that is obtained is carried out continuous decarburizing annealing and handle, annealing temperature is 800～900 ℃, and annealing time is 50～150s;
6) after continuous decarburizing annealing disposes, at N
2-H
2-NH
3In the atmosphere cold-rolled steel strip is carried out continuous nitriding anneal, nitriding temperature is 780～920 ℃, and nitriding time is 10～60s, and the N in control cold-rolled steel strip percentage ratio by weight counts 0.0095～0.0150;
7), be placed on then in the drying oven to remove moisture content at cold-rolled steel strip surface applied separant through continuous nitriding anneal;
8) again at N
2-H
2To carrying out the secondary recrystallization anneal, when heat temperature raising to 750～1100 ℃, keep N in the atmosphere through the cold-rolled steel strip of drying treatment
2Volume be N
2-H
275～90% of atmosphere cumulative volume amount; Continue heat temperature raising to 1180～1200 ℃, and under this temperature, be incubated 10～20h; Technology cooling routinely can be produced required low nitriding amount and high magnetic induction oriented silicon steel strip at last.
Preferably, when in above-mentioned steps 6) in control nitriding temperature when being 780～820 ℃, accordingly in above-mentioned steps 8) in earlier cold-rolled steel strip is rapidly heated to 650 ℃, speed with 50 ℃/h is heated to 750 ℃ then, under this temperature, be incubated 5～10h, speed with 15 ℃/h is heated to 1180～1200 ℃ again, wherein keeps N in the time of 750～1100 ℃
2Volume be N
2-H
285～90% of atmosphere cumulative volume amount.
Preferably, when in above-mentioned steps 6) in control nitriding temperature when being 880～920 ℃; Accordingly in above-mentioned steps 8) in earlier cold-rolled steel strip is rapidly heated to 750 ℃, the speed with 15 ℃/h is heated to 1180～1200 ℃ then, wherein keeps N in the time of 750～1100 ℃
2Volume be N
2-H
275～80% of atmosphere cumulative volume amount.
Further; in above-mentioned steps 4) in; adopt 40～100 ℃ water coolant to be cooled to below 60 ℃ or room temperature through the hot rolled strip that second stage annealing normalizing operation is handled; adopt 150～250 ℃ timeliness rolling mode after the pickling, it once is rolled into the cold-rolled steel strip that thickness is 0.23～0.30mm.
Further, in above-mentioned steps 6) in, at N
2-H
2-NH
3NH in the atmosphere
3Volume be N
2-H
2-NH
31～15% of atmosphere cumulative volume amount, H
2Volume be N
2-H
2-NH
30～25% of atmosphere cumulative volume amount.
Technical scheme of the present invention is based on the research to the oriented silicon steel secondary recrystallization, slab low-temperature heat hot rolling high magnetic induction grain-oriented silicon steel need carry out nitriding usually to be handled, though the nitrogen content before the secondary recrystallization has material impact to secondary recrystallization, but the temperature when secondary recrystallization takes place is about about 1000～1050 ℃, inhibitor quantity under this temperature and size are determining the quality of secondary recrystallization quality, and inhibitor quantity is how much relevant with nitrogen content with size.
It is the technological process of a complexity that the steel band nitriding is handled, and the improper meeting of nitridation process causes the alligatoring of inhibitor in the steel band, thereby influences secondary recrystallization.If in nitriding process, utilize the short time to infiltrate less nitrogen amount, not only can shorten nitriding time and save cost, also less to the influence of steel band oxide film simultaneously, help the good formation of glassy membrane like this.
During secondary recrystallization annealing, the diffusion of steel strip surface nitrogen-atoms is two-way, both also spreads to the steel band outside to the steel band internal divergence, and its ability to the steel band internal divergence depends on nitrogen gesture in the stove.When steel strip surface nitrogen gesture is lower than in the stove nitrogen gesture, thereby the nitrogen-atoms in the furnace atmosphere can reach the required nitrogen content of steel band generation secondary recrystallization to the steel band internal divergence.
Based on above-mentioned research, conclusion the invention has the advantages that: designed production method selects to be not more than 1200 ℃ slab heating temperature, adopt intrinsic inhibitor and obtain the mode that inhibitor combines, proposed in gas nitriding to adopt lower nitriding amount and cooperated the solution of the higher nitrogen ratios of employing in the secondary recrystallization annealing process, the condition of coming the optimal control secondary recrystallization.Because the reduction of nitriding amount makes nitriding time significantly shorten, thereby has improved production efficiency.Simultaneously, the ratio of hydrogen can be unrestricted or few in the nitriding operation, and the content of hydrogen is also lower in the secondary recrystallization annealing operation, thereby significantly reduced production cost.
Embodiment
Be described in further detail below in conjunction with embodiment and Comparative Examples production method low nitriding amount and high magnetic induction oriented silicon steel strip of the present invention:
Embodiment and Comparative Examples 1:
The continuously cast bloom that 210mm is thick is rolled into the production method of low nitriding amount and high magnetic induction oriented silicon steel strip, comprises the steps:
1) casting 210mm thick continuously cast bloom in the continuous casting of molten steel operation, control its chemical ingredients by weight percentage ratio count: C:0.050, Si:3.25, Al
Sol: 0.032, N:0.0055, Cu:0.055, Sn:0.085, Mn:0.120, S:0.010, Cr:0.080, P:0.015, Ti:0.002, all the other inevitably are mingled with for Fe reaches.
2) prepared continuously cast bloom is heated to 1170 ℃ and carries out hot rolling, be rolled into the hot rolled strip that thickness is 2.3mm, the coiling temperature of hot rolled strip is controlled at 550 ℃.
3) adopt second stage annealing normalizing operation that the hot rolled strip that is obtained is handled, the Heating temperature of first section annealing normalizing operation is 1120 ℃, and soaking time is 2min; The Heating temperature of second section annealing normalizing operation is 900 ℃, and soaking time is 2.5min.
4) adopt 40～100 ℃ water coolant, will be cooled to below 60 ℃, after overpickling, adopt 150～250 ℃ timeliness rolling mode again, it once is rolled into the cold-rolled steel strip that thickness is 0.27mm through the hot rolled strip of second stage annealing normalizing operation processing.
5) at wet N
2-H
2In the atmosphere cold-rolled steel strip that is obtained is carried out continuous decarburizing annealing and handle, annealing temperature is 830 ℃, and annealing time is 90s.
6) after decarburizing annealing disposes continuously, at N
2-H
2-NH
3In the atmosphere cold-rolled steel strip is carried out continuous nitriding anneal, NH
3Volume be N
2-H
2-NH
31～15% of atmosphere cumulative volume amount, H
2Volume be N
2-H
2-NH
30～25% of atmosphere cumulative volume amount.780 ℃ of nitriding temperatures, nitriding time are 25s, and the N in control cold-rolled steel strip percentage ratio by weight counts 0.0082～0.0180.
7) after the nitriding anneal finishes continuously,, be placed on then in the drying oven, make the cold-rolled steel strip surface temperature reach 180 ℃, to remove moisture content at the separant of cold-rolled steel strip surface applied based on magnesium oxide.
8) will move in the high-temperature annealing furnace, through the cold-rolled steel strip of drying treatment at N
2-H
2Carry out the secondary recrystallization anneal in the atmosphere, annealing way is for being rapidly heated cold-rolled steel strip to 650 ℃ earlier, and the speed with 50 ℃/h is heated to 750 ℃ then, is incubated 5～10h under this temperature, speed with 15 ℃/h is heated to 1180～1200 ℃ then, wherein keeps N in the time of 750～1100 ℃
2Volume be N
2-H
225～90% of atmosphere cumulative volume amount.After temperature reaches 1180～1200 ℃, under this temperature, be incubated 10～20h.Technology cooling routinely at last.Result by above-mentioned technology gained is as shown in table 1:
Table 1
A annotates: performance data does not apply the tension stress coating
As can be seen from Table 1, when the nitrogen content in the steel before the secondary recrystallization annealing is lower than 95ppm (be N percentage ratio meter be lower than 0.0095) by weight, in the secondary recrystallization annealing process in the time of 750～1100 ℃, N
2-H
2N in the atmosphere
2Even volume reach N
2-H
290% of atmosphere cumulative volume amount, the steel band magnetic property also relatively poor (Comparative Examples: specimen coding 1#, 2#, 3#), major cause is steel band inhibitor quantity not sufficient when reaching the secondary recrystallization annealing temperature, is difficult to take place normal secondary recrystallization.When the nitrogen content in the steel before the secondary recrystallization annealing is 95～150ppm (be N percentage ratio count 0.0095～0.0150) by weight, in the secondary recrystallization annealing process in the time of 750～1100 ℃, control N
2-H
2N in the atmosphere
2Volume be N
2-H
285～90% of atmosphere cumulative volume amount, the steel band magnetic property can reach the performance requriements (the present invention: specimen coding 4#～9#, 11#) of high-quality oriented silicon steel, this moment the formed inhibitor of nitriding amount that in the nitriding treating processes, obtained of steel band just in time stop steel band in temperature-rise period primary recrystallization crystal grain grow up N when reaching the secondary recrystallization annealing temperature
2-H
2Nitrogen-atoms in the atmosphere infiltrates in steel band again and has replenished inhibitor quantity, makes steel band that normal secondary recrystallization take place and grows up.When nitrogen content in the steel band is 142ppm (be N percentage ratio count 0.0142) by weight, in the secondary recrystallization annealing process in the time of 750～1100 ℃, with N
2-H
2N in the atmosphere
2Volume be adjusted to N
2-H
250% of atmosphere cumulative volume amount is replenished enough nitrogen in the steel band during owing to secondary recrystallization, make steel band magnetic not reach desirable level (Comparative Examples: specimen coding 10#).When the nitriding amount that is obtained in the nitriding treating processes when steel band is higher, in the secondary recrystallization annealing process in the time of 750～1100 ℃, with N
2-H
2N in the atmosphere
2Volume be adjusted to N
2-H
225% of atmosphere cumulative volume amount, gained steel band magnetic property obviously reduce (Comparative Examples: specimen coding 12#～14#).
A embodiment and Comparative Examples 2:
The continuously cast bloom that 230mm is thick is rolled into the production method of low nitriding amount and high magnetic induction oriented silicon steel strip, comprises the steps:
1) casting 230mm thick continuously cast bloom in the continuous casting of molten steel operation, control its chemical ingredients by weight percentage ratio count: C:0.059, Si:3.12, Al
Sol: 0.0293, N:0.0070, Cu:0.050, Sn:0.10, Mn:0.07, S:0.004, Cr:0.13, P:0.010, Ti:0.002, all the other inevitably are mingled with for Fe reaches.
2) prepared continuously cast bloom is heated to 1150 ℃ and carries out hot rolling, be rolled into the hot rolled strip that thickness is 2.2mm, the coiling temperature of hot rolled strip is controlled at 550 ℃.
3) adopt second stage annealing normalizing operation that the hot rolled strip that is obtained is handled, the Heating temperature of first section annealing normalizing operation is 1100 ℃, and soaking time is 2min; The Heating temperature of second section annealing normalizing operation is 950 ℃, and soaking time is 2.5min.
4) adopt 40～100 ℃ water coolant, will be cooled to below 60 ℃, after overpickling, adopt 150～250 ℃ timeliness rolling mode again, it once is rolled into the cold-rolled steel strip that thickness is 0.27mm through the hot rolled strip of second stage annealing normalizing operation processing.
5) at wet N
2-H
2In the atmosphere cold-rolled steel strip that is obtained is carried out continuous decarburizing annealing and handle, annealing temperature is 835 ℃, and annealing time is 120s.
6) after decarburizing annealing disposes continuously, at N
2-H
2-NH
3In the atmosphere cold-rolled steel strip is carried out continuous nitriding anneal, NH
3Volume be N
2-H
2-NH
31～15% of atmosphere cumulative volume amount, H
2Volume be N
2-H
2-NH
30～25% of atmosphere cumulative volume amount.920 ℃ of nitriding temperatures, nitriding time are 15s, and the N in control cold-rolled steel strip percentage ratio by weight counts 0.0108～0.0182.
7) after the nitriding anneal finishes continuously,, be placed on then in the drying oven, make the cold-rolled steel strip surface temperature reach 180 ℃, to remove moisture content at the separant of cold-rolled steel strip surface applied based on magnesium oxide.
8) will move in the high-temperature annealing furnace, through the cold-rolled steel strip of drying treatment at N
2-H
2Carry out the secondary recrystallization anneal in the atmosphere, annealing way is for being rapidly heated cold-rolled steel strip to 750 ℃ earlier, and the speed with 15 ℃/h is heated to 1180～1200 ℃ then, wherein keeps N in the time of 750～1100 ℃
2Volume be N
2-H
225～80% of atmosphere cumulative volume amount.After temperature reaches 1180～1200 ℃, under this temperature, be incubated 10～20h.The technology cooling gets final product routinely at last.Result by above-mentioned technology gained is as shown in table 2:
Table 2
Annotate: performance data does not apply the tension stress coating
As can be seen from Table 2, when the nitrogen content in the steel before the secondary recrystallization annealing when 108～138ppm (be N percentage ratio count 0.0108～0.0138) by weight, in the secondary recrystallization annealing process in the time of 750～1100 ℃, control N
2-H
2N in the atmosphere
2Volume be N
2-H
275～80% of atmosphere cumulative volume amount, the steel band magnetic property can reach performance requriements (the present invention: specimen coding 1#～7#) of high-quality oriented silicon steel, simultaneously, the content of hydrogen can change 0～25% in the nitriding atmosphere, to the band steel magnetic property without any influence, both reduced hydrogen consumption, saved cost, widened the range of application of nitriding atmosphere again.When the nitrogen content in the steel before the secondary recrystallization annealing when 145～182ppm (be N percentage ratio count 0.0145～0.0182) by weight, in the time of 750～1100 ℃, regulate N in the secondary recrystallization annealing process
2-H
2N in the atmosphere
2Volume be N
2-H
225～50% of atmosphere cumulative volume amount, the secondary recrystallization of gained band steel is in poor shape, magnetic property decline (Comparative Examples: specimen coding 8#～11#).
Claims (6)
1. the production method of a low nitriding amount and high magnetic induction oriented silicon steel strip comprises the steps:
1) in the continuous casting of molten steel operation control prepared continuously cast bloom chemical ingredients by weight percentage ratio count: C:0.030～0.060, Si:2.50～3.50, Al
Sol: 0.020～0.045, N:0.005～0.009, Cu:0.050～0.100, Sn:0.050～0.150, Mn:0.070～0.150, S:0.003～0.010, Cr:0.020～0.200, P:0.010～0.020, Ti:0.002～0.003, all the other inevitably are mingled with for Fe reaches;
2) prepared continuously cast bloom is heated to 1100～1200 ℃ and carries out hot rolling, be rolled into the hot rolled strip that thickness is 2.0～2.5mm, the coiling temperature of hot rolled strip is controlled at 550～700 ℃;
3) adopt second stage annealing normalizing operation that the hot rolled strip that is obtained is handled, the Heating temperature of first section annealing normalizing operation is 1000～1120 ℃, and soaking time is 1～3min; The Heating temperature of second section annealing normalizing operation is 900～950 ℃, and soaking time is 1～3min;
4) will be cooled to below 60 ℃ or room temperature through the hot rolled strip that second stage annealing normalizing operation is handled, and adopt the once cold rolling method that it is rolled into the cold-rolled steel strip that thickness is 0.23～0.30mm after the pickling;
5) at wet N
2-H
2In the atmosphere cold-rolled steel strip that is obtained is carried out continuous decarburizing annealing and handle, annealing temperature is 800～900 ℃, and annealing time is 50～150s;
6) after continuous decarburizing annealing disposes, at N
2-H
2-NH
3In the atmosphere cold-rolled steel strip is carried out continuous nitriding anneal, nitriding temperature is 780～920 ℃, and nitriding time is 10～60s, and the N in control cold-rolled steel strip percentage ratio by weight counts 0.0095～0.0150;
7), be placed on then in the drying oven to remove moisture content at cold-rolled steel strip surface applied separant through continuous nitriding anneal;
8) again at N
2-H
2To carrying out the secondary recrystallization anneal, when heat temperature raising to 750～1100 ℃, keep N in the atmosphere through the cold-rolled steel strip of drying treatment
2Volume be N
2-H
275～90% of atmosphere cumulative volume amount; Continue heat temperature raising to 1180～1200 ℃, and under this temperature, be incubated 10～20h; Technology cooling routinely can be produced required low nitriding amount and high magnetic induction oriented silicon steel strip at last.
2. the production method of low nitriding amount and high magnetic induction oriented silicon steel strip according to claim 1, it is characterized in that: in the said step 6), nitriding temperature is 780～820 ℃; In the said step 8), earlier cold-rolled steel strip is rapidly heated to 650 ℃, the speed with 50 ℃/h is heated to 750 ℃ then, is incubated 5～10h under this temperature, and the speed with 15 ℃/h is heated to 1180～1200 ℃ again, wherein keeps N in the time of 750～1100 ℃
2Volume be N
2-H
285～90% of atmosphere cumulative volume amount.
3. the production method of low nitriding amount and high magnetic induction oriented silicon steel strip according to claim 1, it is characterized in that: in the said step 6), nitriding temperature is 880～920 ℃; In the said step 8), earlier cold-rolled steel strip is rapidly heated to 750 ℃, the speed with 15 ℃/h is heated to 1180～1200 ℃ then, wherein keeps N in the time of 750～1100 ℃
2Volume be N
2-H
275～80% of atmosphere cumulative volume amount.
4. according to the production method of claim 1 or 2 or 3 described low nitriding amount and high magnetic induction oriented silicon steel strips; it is characterized in that: in the said step 4); adopt 40～100 ℃ water coolant to be cooled to below 60 ℃ or room temperature through the hot rolled strip that second stage annealing normalizing operation is handled; adopt 150～250 ℃ timeliness rolling mode after the pickling, it once is rolled into the cold-rolled steel strip that thickness is 0.23～0.30mm.
5. according to the production method of claim 1 or 2 or 3 described low nitriding amount and high magnetic induction oriented silicon steel strips, it is characterized in that: in the said step 6), at N
2-H
2-NH
3In the atmosphere, NH
3Volume be N
2-H
2-NH
31～15% of atmosphere cumulative volume amount, H
2Volume be N
2-H
2-NH
30～25% of atmosphere cumulative volume amount.
6. the production method of low nitriding amount and high magnetic induction oriented silicon steel strip according to claim 4 is characterized in that: in the said step 6), at N
2-H
2-NH
3NH in the atmosphere
3Volume be N
2-H
2-NH
31～15% of atmosphere cumulative volume amount, H
2Volume be N
2-H
2-NH
30～25% of atmosphere cumulative volume amount.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN110218853A (en) * | 2019-06-26 | 2019-09-10 | 武汉钢铁有限公司 | Prepare the process of low temperature high magnetic induction grain-oriented silicon steel |
| CN112301309A (en) * | 2020-11-02 | 2021-02-02 | 哈尔滨工程大学 | Method for strengthening low-temperature nitridation composite low-temperature diffusion of pure titanium workpiece |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| IT1290172B1 (en) * | 1996-12-24 | 1998-10-19 | Acciai Speciali Terni Spa | PROCEDURE FOR THE PRODUCTION OF GRAIN ORIENTED MAGNETIC SHEETS, WITH HIGH MAGNETIC CHARACTERISTICS. |
| CN1743127A (en) * | 2005-09-29 | 2006-03-08 | 东北大学 | Method for producing oriented silicon steel band by continuous casting and rolling of thin plate slab |
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| CN102881393A (en) * | 2012-09-11 | 2013-01-16 | 华南理工大学 | MnFePSi-based room-temperature magnetic refrigeration material and preparation method thereof |
| CN102881393B (en) * | 2012-09-11 | 2016-06-22 | 华南理工大学 | A kind of MnFePSi basal cell temperature magnetic refrigerating material and preparation method thereof |
| 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 |
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| CN112301309A (en) * | 2020-11-02 | 2021-02-02 | 哈尔滨工程大学 | Method for strengthening low-temperature nitridation composite low-temperature diffusion of pure titanium workpiece |
| CN112301309B (en) * | 2020-11-02 | 2022-11-29 | 哈尔滨工程大学 | Method for strengthening low-temperature nitridation composite low-temperature diffusion of pure titanium workpiece |
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