CN104831039B - A kind of electrical sheet annealing heating method - Google Patents
A kind of electrical sheet annealing heating method Download PDFInfo
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- CN104831039B CN104831039B CN201510270749.2A CN201510270749A CN104831039B CN 104831039 B CN104831039 B CN 104831039B CN 201510270749 A CN201510270749 A CN 201510270749A CN 104831039 B CN104831039 B CN 104831039B
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Abstract
The invention discloses a kind of electrical sheet annealing heating method, using high-temperature plasma local heating, electrical steel strip (1) is completed to recrystallize at a higher temperature, requirement simultaneously to other parts in annealing furnace is low, realize to annealing furnace without higher heatproof requirement, also the annealing of higher temperature can be completed, steel metallurgical quality under the same conditions, obtain the electrical sheet of lower iron loss.Surface quality is good simultaneously.
Description
Technical field
The invention belongs to electrical sheet processing equipment technical field, more particularly to a kind of electrical sheet annealing heating method.
Background technology
The cold rolling large-scale continuous production of high grade electric steel is by improving the Si of steel, Al content, reducing the impurity of steel
Element, reasonable hot rolling is realized with continuous annealing (high temperature) is provided.The high grade electric steel trade mark is higher, and iron loss is lower.Iron loss drops
Low, it is essential means that cold rolled annealed temperature, which is improved,.
The annealing of cold rolling non-oriented electrical steel is realized in continuous annealing furnace.The function of continuous annealing furnace can be realized
Unnecessary carbon and high annealing temperature are removed from steel under reducing atmosphere, by the carbon formation carbon monoxide in steel that is present in of vapor
Degree realizes desired recrystallization.Decarburization and the recrystallization of steel band are realized, the protection gas of the different piece in continuous annealing furnace
Atmosphere is different with heating-up temperature, and the atmosphere of decarbonized portion is made up of hydrogen, nitrogen and vapor, and dew point is high, temperature is relatively low；Recrystallization
Partial protective atmosphere is made up of hydrogen, nitrogen, and dew point is low, temperature is high, and temperature annealing more than 1000 DEG C is desirable to reach.
During the present invention is realized, inventor has found that prior art at least has problems with：Electrical sheet magnetic property
Very sensitive to internal stress, annealing process requires to ensure low internal stress, is that the high-temperature part of this continuous annealing furnace forbids steel band to lead to
Crossing slewing rollers causes steel band to bend and form stress.I.e. cold rolling electric continuous annealing uses horizontal anneal, in water
Prior art is to support steel band using support roller in open hearth.To prevent support roller from causing damage to steel strip surface, to support roller table
There is very high requirement in face.Present support roller is substantially using carbon materials (graphite) or ceramics manufacture roller set and belt steel surface
Contact.
Because high-silicon electrical steel annealing is needed through too high moisture, hot environment, the surface of steel is oxidized, then in high hydrogen gas
Reduced under atmosphere, hot conditions, steel surface is very soft, under the conditions of high temperature and deadweight, be very easy to stick to carbon materials (stone
Ink) or the ceramic support roller surface manufactured, annealed band surface is badly damaged.
High-temperature heating has a variety of methods, and electrical sheet is changed into nonferromugnetic material at high temperature, and the efficiency of sensing heating is very
It is low.
Improve bringing-up section and soaking zone temperature, to heating element heater or and associated components propose higher heat resistant requirements, it is real
It is now also extremely difficult.
The content of the invention
The technical problems to be solved by the invention are a kind of using reheater local heating, complete electrical steel strip more
Recrystallized under high-temperature, while the requirement to other parts in annealing furnace is low, realizing will without higher heatproof to annealing furnace
Ask, can also complete the electrical sheet annealing heating method of the annealing of higher temperature.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：A kind of electrical sheet annealing heating method,
Including body of heater, have in the body of heater：
The bringing-up section and soaking zone annealed to steel band；
In the support roller of body of heater inner support steel band；
It is arranged on soaking zone, the reheater heated again to steel band；
Annealing heating process comprises the following steps：
1) steel band bringing-up section in the lehr and it is heated to annealing temperature and is incubated during soaking zone；
2) during strip anneal, when steel band runs to reheater, reheater is heated again to steel band；
3) steel band enters the cooling section of body of heater after, is cooled to room temperature.
The reheater steel band is reheated, made reheater part temperature of steel strips it is higher than furnace temperature by 10~
150 DEG C, bringing-up section and the temperature of soaking zone are at 950~1100 DEG C in annealing furnace.
The bringing-up section and equal hot junction are by setting partition wall to separate.
The support roller is uniformly distributed in body of heater.
The reheater is arranged between two neighboring support roller, and close to the support at steel band traffic direction rear
Roller.
In the 2nd step, gas is passed through into reheater, and reheater is powered, reheater electric discharge makes
Gas plasma, produces heat and steel band is heated again.
A technical scheme in above-mentioned technical proposal has the following advantages that or beneficial effect that reheater uses electrode
Make the formation high-temperature plasma such as hydrogen or nitrogen or argon gas, and release heat, in motion in the cold rolled annealed stove of electrical sheet
Steel band carry out 10~150 DEG C higher than conventional heating of quick, Short Time Heating, significantly reduce the iron loss of cold rolled annealed electrical sheet,
Improve magnetic property.While part, superhigh temperature heating anneal is completed, the requirement to annealing furnace and its part does not substantially become
Change, the life-span of annealing furnace and its part does not have significant impact.Simultaneously as temperature when steel band reaches support roller is kept substantially
It is consistent with furnace temperature, reduce roll surface and occur bonding and the probability damaged.Obtaining the effect that higher temperature is annealed, iron loss is lower
While fruit, the surface quality that annealed band has been resulted in.
Brief description of the drawings
Fig. 1 is the structural representation of the electrical sheet annealing heating device provided in the embodiment of the present invention；
Fig. 2 is the structural representation of the first embodiment of Fig. 1 reheater；
Fig. 3 is Fig. 2 A-A sectional views；
Fig. 4 is the structural representation of second of embodiment of Fig. 1 reheater；
Fig. 5 is Fig. 4 A-A sectional views；
Mark in above-mentioned figure is：1st, steel band, 2, body of heater, 3, bringing-up section, 4, soaking zone, 5, reheater, 6, branch
Support roller, 7, partition wall.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one
Referring to Fig. 1, a kind of electrical sheet annealing heating method, including body of heater 2 has in body of heater 2：
The bringing-up section 3 and soaking zone 4 annealed to steel band 1；
In the support roller 6 of the inner support steel band 1 of body of heater 2；
It is arranged on soaking zone 4, the reheater 5 heated again to steel band 1；
Annealing heating process comprises the following steps：
1) bringing-up section 3 of steel band 1 in the lehr with soaking zone 4 when be heated to annealing temperature and be incubated；
2) in the annealing process of steel band 1, when steel band 1 runs to reheater 5, reheater 5 to steel band 1 again
Heating；
3) steel band 1 enters the cooling section of body of heater 2 after, is cooled to room temperature.
Reheater 5 steel band 1 is reheated, made the part of reheater 5 the temperature of steel band 1 it is higher than furnace temperature by 10~
150 DEG C, bringing-up section 3 and the temperature of soaking zone 4 are at 950~1100 DEG C in annealing furnace.
Annealed band 1 of the electrical sheet in continuous annealing furnace is that, by entering bringing-up section 3 after preheating, heating reaches defined
Enter soaking zone 4 after annealing temperature.The recrystallization for completing to require is incubated in soaking zone 4, room temperature is cooled to after completing recrystallization, it is complete
Into annealing.
Annealed band 1 is annealed in continuous oven for homogeneous heating, continuous production, and support roller 6, support are set in annealing
The rotating speed of roller 6 causes linear velocity consistent with the speed of service of steel band 1.Due to continuous annealing furnace in order to realize decarburization and anti-oxidation,
With the reduction of oxide, stove is interior to be full of protective gas.Protective gas is made up of hydrogen, nitrogen and vapor.Therefore, support roller 6
Outer surface be graphite (carbon materials), ceramics, quartz etc. composition.
Partition wall 7 is set between bringing-up section 3 and soaking zone 4, it is therefore an objective to the protective gas isolated between two sections, soaking zone is realized
4 high reproducibilities.
In the soaking zone 4 of annealing furnace, plasma heating device is set.Position is the traffic direction according to strip, close to enter
Mouthful support roller 6, reason is：By the quick heating of plasma, the temperature of steel band 1 is higher than furnace temperature, leaves plasma heating
Device, temperature is begun to decline, and when reaching next support roller 6, is greatly lowered when the temperature of steel band 1 is than maximum temperature, is approached
Furnace temperature (defined annealing temperature).So, although the annealing temperature of steel band 1 is improved, but does not have notable shadow to annealing furnace inner part
Ring, the probability for occurring the dross of support roller 6 significantly declines.
Support roller 6 is uniformly distributed in body of heater 2.
Reheater 5 is arranged between two neighboring support roller 6, and close to the support at the traffic direction rear of steel band 1
Roller 6.
In the 2nd step, gas is passed through into reheater 5, and reheater 5 is powered, reheater 5 discharges
Make gas plasma, produce heat and steel band 1 is heated again.
The bringing-up section 3 and soaking zone 4 of cold rolling high-silicon electrical steel annealing furnace are nitrogen and the hydrogen mixing in high hydrogen concentration
Heated under the conditions of protective atmosphere, the temperature of soaking zone 4 is at 950~1100 DEG C.
High-temperature plasma heating blowpipe is used as working media, 1150 DEG C of outlet temperature ＞ using hydrogen or nitrogen or argon gas.It is high
The width of warm heating plasma torch is in 20~200mm.Steel band 1 is heated by high-temperature plasma heating blowpipe, and the temperature of steel band 1 compares furnace temperature
High 10~150 DEG C, steel band 1 completes high temperature re-crystallization between two support roller, and outlet (relative to two branch are reached in steel band 1
For holding roller), the temperature of steel band 1 is reduced to close to fire box temperature, make support roller 6 and the operating temperature of annealing burner hearth it is low (relative to
The actual heating maximum temperature of steel band 1).
As shown in Figures 2 and 3, reheater 5 has：
The first electrode and second electrode being oppositely arranged in the both sides of steel band 1, first electrode and second electrode are connected respectively to
The two ends of power supply.
The feed tube of gas can be sprayed by being equipped near first electrode and second electrode.
Feed tube supply is hydrogen.
The length of first electrode and second electrode is more than the width of annealing furnace, and first electrode and second electrode stretch out annealing furnace
Outer part is connected with power supply.
The two ends of first electrode and second electrode are cylindrical, and the middle part of first electrode and second electrode is equilateral triangular prism
Shape, a rib of equilateral triangular prism is just to the surface of steel band 1, and three ribs are equivalent actions, and each rib can be used as electrode
Discharge portion is used, and improves electrode life (end-of-life, with another).
Feed tube is parallel with first electrode and second electrode, and hole or gap are evenly distributed with feed tube.Hydrogen
Gas is sprayed from feed tube, and the hydrogen opening of feed tube is provided with hole or gap hydrogen towards electrode in feed tube
Gas blowout is mapped to the region of discharge of electrode, and the conduction of electrode discharge is the plasmarized realization by hydrogen.It is non-to ensure heating
Aoxidize completion under the conditions of (reduction).
Electrical circuit is：Power supply → electrode → hydrogen → 1 → hydrogen of steel band → electrode → power supply.Because hydrogen is in the table of steel band 1
Face electric discharge causes electric arc formation high temperature, and the two sides of steel band 1 is two poles of electrical circuit, i.e.,：The bipolar electrode effect of electricity.
The heating means of electrical sheet annealing heating device, comprise the following steps：
1 steel band 1 is heated to annealing temperature when entering annealing furnace in the bringing-up section 3 of annealing furnace；
When 2 steel bands 1 move to 5 position of reheater, feed tube sprays gas to first electrode and second electrode,
First electrode and second electrode electric discharge make gas plasma, produce heat and steel band 1 is heated again；
3 steel bands 1 are left after reheater 5, when leaving soaking zone 4, and the temperature of steel band 1 is close to furnace temperature.
The temperature of steel band 1 of the part of reheater 5 is higher than furnace temperature 10~150 DEG C, bringing-up section 3 and soaking zone 4 in annealing furnace
Temperature at 950~1100 DEG C.
Embodiment two
As shown in Figures 4 and 5, be reheater 5 second of embodiment structural representation.
Wherein, reheater has：
The electrode group set on the surface of steel band 1, electrode group includes two electrodes, and two electrodes are connected respectively to the two of power supply
End.
The upper and lower surface of steel band 1 is respectively provided with one group of electrode group, respectively first electrode group and second electrode group.
The feed tube of gas can be sprayed by being provided between two electrodes of electrode group.
The distance between two electrodes of electrode group are adjustable, and electrode group and the relative position of steel band 1 are adjustable.The spacing of electrode
From regulation can adjust heating power density of the hydrogen plasma to steel band between electrode 1, effectively regulation steel band 1 heating speed
Degree and the maximum temperature that can be reached.The distance and electrode of a pair of electrodes being equipped with by the one side changed in electrical sheet steel band 1
The distance of group and steel band 1, adjusts the power density of hydrogen heating plasma, realizes firing rate and the temperature being heated to steel band 1
The regulation of degree.
Feed tube supply is hydrogen.
The length of electrode is more than the width of annealing furnace, and the part that electrode is stretched out outside annealing furnace is connected with power supply.
The two ends of electrode are cylinder, and the middle part of electrode is equilateral triangular prism shaped, and a rib of equilateral triangular prism is just to steel
The surface of band 1 a, rib of two electrodes of electrode group is relative.Three ribs are equivalent actions, and each rib can be used as electrode
Discharge portion use, improve electrode life (end-of-life, with another).
Hole or gap are evenly distributed with feed tube and electrode runs parallel, feed tube.Hydrogen is from gas supply
Pipe sprays, and the hydrogen opening of feed tube is provided with hole or gap towards electrode, in feed tube and hydrogen injection is arrived electrode
Region of discharge, the conduction of electrode discharge is the plasmarized realization by hydrogen.It is in non-oxide (reduction) condition to ensure heating
It is lower to complete.
Electrical circuit has two, 1 upper surface of steel band one, lower surface one：Upper surface electrical circuit, power supply → electrode → hydrogen
1 → hydrogen of → steel band → electrode → power supply；Lower surface electrical circuit, power supply → electrode → hydrogen → 1 → hydrogen of steel band → electrode →
Power supply.Due to hydrogen the surface-discharge of steel band 1 cause electric arc formation high temperature, steel band 1 as electrical circuit two poles, i.e.,：Electricity
Bipolar electrode effect.
The heating means of above-mentioned electrical sheet is adjustable annealing heating device, comprise the following steps：
1 steel band 1 is heated to annealing temperature when entering annealing furnace in the bringing-up section 3 of annealing furnace；
When 2 steel bands 1 move to 5 position of reheater, feed tube sprays gas, two electricity of electrode group to electrode
Pole electric discharge makes gas plasma, produces heat and steel band 1 is heated again；
3 steel bands 1 are left after reheater, when leaving soaking zone 4, and the temperature of steel band 1 is close to furnace temperature.
After above-mentioned scheme, the formation high-temperature plasma such as hydrogen or nitrogen or argon gas is made using electrode, and release
Heat, carries out 10~150 DEG C higher than conventional heating quick, in short-term in the cold rolled annealed stove of electrical sheet to the steel band 1 in motion
Heating, significantly reduces the iron loss of cold rolled annealed electrical sheet, improves magnetic property.While part, superhigh temperature heating anneal is completed,
Requirement to annealing furnace and its part does not have a significant change, and the life-span of annealing furnace and its part does not have significant impact.Meanwhile, by
Temperature when steel band 1 reaches support roller 6 keeps consistent with furnace temperature substantially, reduces what the generation of the surface of support roller 6 was bonded and damaged
Probability.While the effect that higher temperature is annealed, iron loss is lower is obtained, the surface quality that annealed band 1 has been resulted in.
Under the conditions of same quality coil of strip metallurgical quality, annealing temperature is high, the iron loss reduction of electrical sheet.1) same quality coil of strip
Under the conditions of metallurgical quality, the electrical sheet of the higher trade mark (iron loss is lower) is resulted in；2) because steel band 1 is added using localized hyperthermia
Heat, makes the actual annealing high temperature conventional annealing temperature of annealing electrical sheet steel band 1, obtains high magnetic characteristics (low iron loss, the trade mark are higher)
High silicon, high grade electric steel with excellent surface quality.Simultaneously because in-furnace temperature is not improved so that in body of heater 2 and stove
The part requirement (heatproof, abrasion and dross) of operation is not improved, and production cost is low, product magnetic property and surface quality are more preferable.
The present invention is exemplarily described above in conjunction with accompanying drawing, it is clear that the present invention is implemented not by aforesaid way
Limitation, as long as the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress is employed, or without changing
Enter and the design of the present invention and technical scheme are directly applied into other occasions, within protection scope of the present invention.
Claims (2)
1. a kind of electrical sheet annealing heating method, including body of heater (2), it is characterised in that have in the body of heater (2)：
The bringing-up section (3) and soaking zone (4) annealed to steel band (1)；
In the support roller (6) of body of heater (2) inner support steel band (1)；
It is arranged on soaking zone (4), the reheater (5) heated again to steel band (1)；
Annealing heating process comprises the following steps：
1) bringing-up section (3) of steel band (1) in the lehr with soaking zone (4) when be heated to annealing temperature and be incubated；
2) in steel band (1) annealing process, when steel band (1) runs to reheater (5), reheater (5) is to steel band
(1) heat again；
3) steel band (1) enters the cooling section of body of heater (2) after, is cooled to room temperature；
Steel band (1) temperature that the reheater (5) was reheated, made reheater (5) part to steel band (1) compares stove
Temperature is high 10~150 DEG C, and bringing-up section (3) and the temperature of soaking zone (4) are at 950~1100 DEG C in annealing furnace；
In the 2nd step, gas is passed through into reheater (5), and reheater (5) is powered, reheater (5) is put
Electricity makes gas plasma, produces heat and steel band (1) is heated again；
The bringing-up section (3) and equal hot junction are by setting partition wall (7) to separate；
The support roller (6) is uniformly distributed in body of heater (2).
2. electrical sheet annealing heating method as claimed in claim 1, it is characterised in that the reheater (5) is arranged on
Between two neighboring support roller (6), and close to the support roller (6) at steel band (1) traffic direction rear.
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| CN105369125B (en) * | 2015-12-07 | 2018-06-26 | 武汉钢铁有限公司 | A kind of high silicon plate of No yield point and preparation method |
| CN115287443A (en) * | 2022-07-11 | 2022-11-04 | 肇庆宏旺金属实业有限公司 | High-temperature annealing device for silicon steel coil and using method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103866109A (en) * | 2014-03-11 | 2014-06-18 | 重庆万达薄板有限公司 | Non-oriented electrical steel strip annealing furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866109A (en) * | 2014-03-11 | 2014-06-18 | 重庆万达薄板有限公司 | Non-oriented electrical steel strip annealing furnace |
Non-Patent Citations (1)
| Title |
|---|
| "第一条国产化电工钢连续退火生产线的设计特点";徐跃民，等;《钢铁研究》;19990930(第5期);30 * |
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