CN105112617A - Novel high-temperature annealing process of cold-rolled oriented silicone steel - Google Patents
Novel high-temperature annealing process of cold-rolled oriented silicone steel Download PDFInfo
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- CN105112617A CN105112617A CN201510615886.5A CN201510615886A CN105112617A CN 105112617 A CN105112617 A CN 105112617A CN 201510615886 A CN201510615886 A CN 201510615886A CN 105112617 A CN105112617 A CN 105112617A
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Abstract
The invention discloses a novel high-temperature annealing process of cold-rolled oriented silicone steel. According to the process, decomposed ammonia is used to replace pure dry hydrogen, so that danger coefficient is lowered while the objectives of energy conservation and consumption reduction are achieved on the premise that performance of a final product is unaffected; a steel coil is fed into a furnace, a furnace platform is sealed, an outer cover is added, heating is performed for temperature rise, 8m<3> of N2 is fed before heating to empty air in the furnace, and temperature of a furnace body is increased to 570 DEG C under a protection atmosphere of N2 by 8m<3>/h; after the temperature is increased to 570 DEG C, 6m<3> of the decomposed ammonia is used for protection for 20-30h, and the temperature is increased to 650 DEG C and maintained for 10-15h; after temperature maintaining is finished, the temperature is increased to 1130-1200 DEG C at a speed of 15-20 DEG C per hour for secondary recrystallization; power supply is cut off, the decomposed ammonia of 3m<3>/h is used for protection for cooling, and when the temperature is below 1000 DEG C, N2 of 6m<3>/h is used for cooling to 450 DEG C for discharging.
Description
Technical field
Cold-rolled orientation silicon steel high temperature annealing novel process of the present invention, is specifically related to the technical fields such as chemical technology field, mechanical manufacturing field, metallic substance science, metal heat treatmet.
Background technology
The production technique of current domestic Ji Jia cold-rolled orientation silicon steel factory puts into stove by coating magnesian silicon steel coil, starts to pass into 8 ~ 10m after carrying out sealing
3n
2, by the O in stove
2start after emptying to heat up, in 2 ~ 3h, temperature is raised to 570 DEG C ~ 600 DEG C, insulation 15 ~ 30h, protective atmosphere is now 6m
3decomposed ammonia; Then in 1h, be warmed up to 650 DEG C, insulation 10 ~ 20h, this process whole process protection atmosphere is 6m
3decomposed ammonia; Then be warmed up to 1130 DEG C ~ 1200 DEG C, the temperature rise period heats up by the speed of 15 DEG C ~ 20 DEG C/h, and protective atmosphere is 5m
3decomposed ammonia, insulation 24 ~ 30h when reaching 1130 DEG C ~ 1200 DEG C, protective atmosphere is 3m
3pure dry hydrogen; Being exactly finally temperature-fall period, when dropping to below 1000 DEG C for 1130 DEG C ~ 1200 DEG C, using 3m instead
3decomposed ammonia, cooling rate is 60 DEG C/about h, uses 6m instead when dropping to below 1000
3n
2start to do shielding gas, cooling rate controls between 10 DEG C ~ 40 DEG C, until less than 450 DEG C time coil of strip come out of the stove.
Above-mentioned technique switches atmosphere when reaching the temperature of high insulation, uses pure dry hydrogen atmosphere instead and carries out protection heating.Owing at high temperature using pure hydrogen to there is certain danger, may cause body of heater with certain oxygen blow out if hydrogen is impure, pure hydrogen will far away higher than decomposed ammonia on production cost, and production cost is high.
Summary of the invention
Instant invention overcomes the deficiency that prior art exists, provide a kind of cold-rolled orientation silicon steel high temperature annealing novel process, this technique uses pure dry hydrogen atmosphere instead decomposed ammonia, under the prerequisite not affecting the finished product performance, reduce danger coefficient, reaches energy-saving and cost-reducing object.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: cold-rolled orientation silicon steel high temperature annealing novel process, comprises the steps:
The first step: coil of strip shove charge, first utilizes high-pressure air to clean to table before shove charge, and the dust in ventpipe or other impurities purging is clean, then selects the charging tray and charging basket that match according to the coil diameter size of coil of strip, is divided by coil of strip three layers to put into stove;
Second step: table seals, inner bag is covered on the coil of strip installed, sealing-ring above the sealing groove of inner bag lower end and table is coincide, with the bolt that table carries, inner bag and table are linked together, pass into recirculated water in the water-cooled tube then bottom table to ensure that the ring flange of table and inner cover can not high temperature deformation;
3rd step: add outer cover, at the additional outer cover of the inner bag of good seal, outer cover adopts heated by natural gas or electrically heated mode to heat, and table uses electrically heated;
4th step: heat temperature raising, first passes into 5-8m before heating
3n
2then heat emptying for the air in stove;
5th step: low holding stage, at 5-8m
3the N of/h
2under protective atmosphere, body of heater is warmed up to 530-570 DEG C, after being warmed up to 530-570 DEG C, using 3-6m instead
3decomposed ammonia carry out protection 20 ~ 30h, then under same atmosphere, be warmed up to 600-650 DEG C and be incubated 10 ~ 20h;
6th step: high holding stage, also with 3-6m after being raised to 1130 DEG C-1200 DEG C with 15 ~ 20 DEG C/h speed after low insulation terminates
3decomposed ammonia carry out protection 20-25h, there is secondary recrystallization in the process, and purifying treatment (namely removing the detrimental impurity such as N, the S in silicon steel) carried out to the silicon steel in stove;
7th step: temperature-fall period, after high insulation terminates, 3-6m is used in power-off instead
3the decomposed ammonia protection of/h cools, and is changed to 3-6m again to less than 1000 DEG C
3the N of/h
2400-550 DEG C are cooled to come out of the stove.
Preferably, in described 5th step, removed by the constitution water in magnesium oxide at low holding stage, controlled atmosphere dew point, below 0 DEG C, prevents FeO and Fe in surface film oxide
2siO
4content increase, bad to the bottom layer quality later formed.
Preferably, in described 6th step, at high holding stage, be warmed up to 1000 DEG C of formation bottoms, now controlled atmosphere dew point is not more than-15 DEG C, and whole temperature-rise period uses 5m
3the decomposed ammonia of/h, start to be converted to dew point of atmosphere when being raised to 1130 ~ 1200 DEG C lower than the decomposed ammonia of-60 DEG C, control flow is 6m
3/ h is incubated 24h and carries out purification annealing, makes the decomposed ammonia dew point of discharge be not more than-20 DEG C.
The beneficial effect that the present invention compared with prior art has is: the present invention is compared with existing method, existing method is that section uses pure hydrogen between height insulation, because the activity of hydrogen is very high, hydrogen is at high temperature used easily to blast, the present invention then uses decomposed ammonia at high holding stage, decomposed ammonia relative hydrogen is more stable, and on production cost, also comparatively hydrogen is low, and the present invention can play the effect reducing probability and the production cost had an accident.
Embodiment
Application principle of the present invention, effect and effect, be explained by following embodiment.
Embodiment one
Cold-rolled orientation silicon steel high temperature annealing production technique of the present invention, comprises the steps:
1, coil of strip shove charge, first utilizes high-pressure air to clean to table before shove charge, and the dust in ventpipe or other impurities purging is clean, then selects suitable charging tray and charging basket according to the volume of coil of strip through size, is divided by coil of strip three layers to put into stove.
2, table sealing.Inner bag is covered on the coil of strip installed, sealing-ring above the sealing groove of inner bag lower end and table is coincide, with the bolt that table carries, inner bag and table are linked together, pass into recirculated water in the water-cooled tube then bottom table to ensure that the ring flange of table and inner cover can not high temperature deformation.
3, add outer cover, at the additional outer cover of the inner bag of good seal, outer cover adopts the mode of heated by natural gas to heat, and table uses electrically heated.
4, heat temperature raising, first passes into 8m before heating
3pure N
2then heat emptying for the air in stove.
5, low holding stage, at 8m
3the pure N of/h
2fast body of heater is warmed up to 570 DEG C under protective atmosphere, after being warmed up to 570 DEG C, using 6m instead
3decomposed ammonia carry out protection 20h, under same atmosphere, be then rapidly heated 650 DEG C and be incubated 10h.The effect in this stage is removed by the constitution water in magnesium oxide, and controlled atmosphere dew point is below 0 DEG C.Prevent FeO and Fe in surface film oxide
2siO
4increasing of content, bad to the bottom layer quality formed later.
6, high holding stage, is raised to 1130 DEG C-1200 DEG C slowly with 15 ~ 20 DEG C/h speed after low insulation terminates and secondary recrystallization occurs.Be warmed up to 1000 DEG C of formation bottoms, now controlled atmosphere dew point is not more than-15 DEG C. and whole temperature-rise period uses 5m
3the decomposed ammonia of/h, start to be converted to dew point of atmosphere when being raised to 1185 DEG C lower than the decomposed ammonia of-60 DEG C, control flow is 6m
3/ h is incubated 24h and carries out purification annealing, makes the decomposed ammonia dew point of discharge be not more than-20 DEG C.
7, temperature-fall period, after high insulation terminates, 3m is used in power-off instead
3the decomposed ammonia protection of/h cools, and is changed to 6m again to less than 1000 DEG C
3the N of/h
2400 DEG C are cooled to come out of the stove.
Embodiment two
1, coil of strip shove charge, first utilizes high-pressure air to clean to table before shove charge, and the dust in ventpipe or other impurities purging is clean, then selects suitable charging tray and charging basket according to the volume of coil of strip through size, is divided by coil of strip three layers to put into stove.
2, table sealing, inner bag is covered on the coil of strip installed, sealing-ring above the sealing groove of inner bag lower end and table is coincide, with the bolt that table carries, inner bag and table are linked together, pass into recirculated water in the water-cooled tube then bottom table to ensure that the ring flange of table and inner cover can not high temperature deformation.
3, add outer cover, at the additional outer cover of the inner bag of good seal, outer cover adopts the mode of heated by natural gas to heat, and table uses electrically heated.
4, heat temperature raising, first passes into 8m before heating
3pure N
2then heat emptying for the air in stove.
5, low holding stage, at 8m
3the pure N of/h
2fast body of heater is warmed up to 570 DEG C under protective atmosphere, after being warmed up to 570 DEG C, using 6m instead
3decomposed ammonia carry out protection 30h, under same atmosphere, be then rapidly heated 650 DEG C and be incubated 10h.The effect in this stage is removed by the constitution water in magnesium oxide, and controlled atmosphere dew point is below 0 DEG C.Prevent FeO and Fe in surface film oxide
2siO
4increasing of content, bad to the bottom layer quality formed later.
6, high holding stage, is raised to 1130 DEG C-1200 DEG C slowly with 15 ~ 20 DEG C/h speed after low insulation terminates and secondary recrystallization occurs.Be warmed up to 1000 DEG C of formation bottoms, now controlled atmosphere dew point is not more than-15 DEG C, and whole temperature-rise period uses 5m
3the decomposed ammonia of/h, start to be converted to dew point of atmosphere when being raised to 1185 DEG C lower than the decomposed ammonia of-60 DEG C, control flow is 6m
3/ h is incubated 20h and carries out purification annealing, makes the decomposed ammonia dew point of discharge be not more than-20 DEG C.
7, temperature-fall period, after high insulation terminates, 3m is used in power-off instead
3the decomposed ammonia protection of/h cools, and is changed to 6m again to less than 1000 DEG C
3the N of/h
2450 DEG C are cooled to come out of the stove.
Embodiment three
1, coil of strip shove charge, first utilizes high-pressure air to clean to table before shove charge, and the dust in ventpipe or other impurities purging is clean, then selects suitable charging tray and charging basket according to the volume of coil of strip through size, is divided by coil of strip three layers to put into stove.
2, table sealing, inner bag is covered on the coil of strip installed, sealing-ring above the sealing groove of inner bag lower end and table is coincide, with the bolt that table carries, inner bag and table are linked together, pass into recirculated water in the water-cooled tube then bottom table to ensure that the ring flange of table and inner cover can not high temperature deformation.
3, add outer cover, at the additional outer cover of the inner bag of good seal, outer cover adopts the mode of heated by natural gas to heat, and table uses electrically heated.
4, heat temperature raising, first passes into 8m before heating
3pure N
2then heat emptying for the air in stove.
5, low holding stage, at 8m
3the pure N of/h
2fast body of heater is warmed up to 570 DEG C under protective atmosphere, after being warmed up to 570 DEG C, using 6m instead
3decomposed ammonia carry out protection 30h, under same atmosphere, be then rapidly heated 650 DEG C and be incubated 15h.The effect in this stage is removed by the constitution water in magnesium oxide, and controlled atmosphere dew point is below 0 DEG C.Prevent FeO and Fe in surface film oxide
2siO
4increasing of content, bad to the bottom layer quality formed later.
6, high holding stage, is raised to 1130 DEG C-1200 DEG C slowly with 15 ~ 20 DEG C/h speed after low insulation terminates and secondary recrystallization occurs.Be warmed up to 1000 DEG C of formation bottoms, now controlled atmosphere dew point is not more than-15 DEG C.Whole temperature-rise period uses 5m
3the decomposed ammonia of/h, start to be converted to dew point of atmosphere when being raised to 1170 DEG C lower than the decomposed ammonia of-60 DEG C, control flow is 6m
3/ h is incubated 24h and carries out purification annealing, makes the decomposed ammonia dew point of discharge be not more than-20 DEG C.
7, temperature-fall period, after high insulation terminates, 3m is used in power-off instead
3the decomposed ammonia protection of/h cools, and is changed to 6m again to less than 1000 DEG C
3the N of/h
2500 DEG C are cooled to come out of the stove.
In sum, cold-rolled orientation silicon steel high temperature annealing novel process of the present invention, has the probability that reduction accident occurs and the advantage of saving energy and reduce the cost.
The present invention is explained in detail above, but the present invention is not limited to above-described embodiment in conjunction with the embodiments, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from present inventive concept.
Claims (3)
1. cold-rolled orientation silicon steel high temperature annealing novel process, is characterized in that, comprises the steps:
The first step: coil of strip shove charge, first utilizes high-pressure air to clean to table before shove charge, and the dust in ventpipe or other impurities purging is clean, then selects the charging tray and charging basket that match according to the coil diameter size of coil of strip, is divided by coil of strip three layers to put into stove;
Second step: table seals, inner bag is covered on the coil of strip installed, sealing-ring above the sealing groove of inner bag lower end and table is coincide, with the bolt that table carries, inner bag and table are linked together, pass into recirculated water in the water-cooled tube then bottom table to ensure that the ring flange of table and inner cover can not high temperature deformation;
3rd step: add outer cover, at the additional outer cover of the inner bag of good seal, outer cover adopts heated by natural gas or electrically heated mode to heat, and table uses electrically heated;
4th step: heat temperature raising, first passes into 5-8m before heating
3n
2then heat emptying for the air in stove;
5th step: low holding stage, at 5-8m
3the N of/h
2under protective atmosphere, body of heater is warmed up to 530 DEG C-570 DEG C, after being warmed up to 530 DEG C-570 DEG C, using 3-6m instead
3decomposed ammonia carry out protection 20 ~ 30h, under same atmosphere, be then warmed up to 600 DEG C-650 DEG C and be incubated 10 ~ 20h;
6th step: high holding stage, also with 3-6m after being raised to 1130 DEG C-1200 DEG C with 15 ~ 20 DEG C/h speed after low insulation terminates
3decomposed ammonia carry out protection 20-25h, there is secondary recrystallization in the process, and purifying treatment carried out to the silicon steel in stove, namely remove the detrimental impurity such as N, the S in silicon steel;
7th step: temperature-fall period, after high insulation terminates, 3-6m is used in power-off instead
3the decomposed ammonia protection of/h cools, and is changed to 3-6m again to less than 1000 DEG C
3the N of/h
2400-550 DEG C are cooled to come out of the stove.
2. cold-rolled orientation silicon steel high temperature annealing novel process according to claim 1, is characterized in that, in described 5th step, removed by the constitution water in magnesium oxide at low holding stage, controlled atmosphere dew point, below 0 DEG C, prevents FeO and Fe in surface film oxide
2siO
4content increase, bad to the bottom layer quality later formed.
3. cold-rolled orientation silicon steel high temperature annealing novel process according to claim 1, is characterized in that, in described 6th step, at high holding stage, be warmed up to 1000 DEG C of formation bottoms, now controlled atmosphere dew point is not more than-15 DEG C, and whole temperature-rise period uses 3-6m
3the decomposed ammonia of/h, start to be converted to dew point of atmosphere when being raised to 1130 ~ 1200 DEG C lower than the decomposed ammonia of-60 DEG C, control flow is 3-6m
3/ h is incubated 20-25h and carries out high temperature purification annealing, makes the decomposed ammonia dew point of discharge be not more than-20 DEG C.
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|---|---|---|---|
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106435102A (en) * | 2016-08-17 | 2017-02-22 | 包头市威丰稀土电磁材料股份有限公司 | Tunnel type oriented silicon steel continuous high-temperature annealing process |
| CN109022701A (en) * | 2018-09-21 | 2018-12-18 | 蚌埠市双环电子集团股份有限公司 | A kind of soft magnetic materials annealing heat-treatment method |
| CN112593053A (en) * | 2020-12-14 | 2021-04-02 | 海安华诚新材料有限公司 | Oriented silicon steel high-temperature annealing process with low gas consumption optimization cost |
| CN113174468A (en) * | 2021-04-30 | 2021-07-27 | 福建省奥克兰光电科技有限公司 | Two-stage annealing process for high-temperature annealing and low-heat-preservation stage of oriented silicon steel bell-type furnace |
| CN113174469A (en) * | 2021-04-30 | 2021-07-27 | 福建省奥克兰光电科技有限公司 | Energy-saving process for high-temperature annealing and low-heat-preservation stage of oriented silicon steel bell-type furnace |
| CN113293280A (en) * | 2021-06-03 | 2021-08-24 | 包头威丰新材料有限公司 | Continuous high-temperature bell-type annealing furnace for oriented silicon steel and annealing process thereof |
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| CN113174469A (en) * | 2021-04-30 | 2021-07-27 | 福建省奥克兰光电科技有限公司 | Energy-saving process for high-temperature annealing and low-heat-preservation stage of oriented silicon steel bell-type furnace |
| CN113293280A (en) * | 2021-06-03 | 2021-08-24 | 包头威丰新材料有限公司 | Continuous high-temperature bell-type annealing furnace for oriented silicon steel and annealing process thereof |
| CN113293280B (en) * | 2021-06-03 | 2022-06-17 | 包头威丰新材料有限公司 | Continuous high-temperature bell-type annealing furnace for oriented silicon steel and annealing process thereof |
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