CN103451399A - Annealing process for producing cold rolling non-oriented electrical steel - Google Patents
Annealing process for producing cold rolling non-oriented electrical steel Download PDFInfo
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Abstract
The invention discloses an annealing process for producing cold rolling non-oriented electrical steel. Band steel continuous annealing and galvanizing common production lines are adopted for the annealing working procedure, and the annealing working procedure comprises the following process conditions: A. preheating stage: preheating band steel to 190 DEG C +/-40 DEG C; B. heating at a direct-combustion stage: heating the band steel at naked flame to 700 DEG C+/-60 DEG C; C. heating by a radiant tube: continuing heating the band steel by a radiant tube to 780 DEG C+/-60 DEG C, and controlling the dew point to be less than or equal to minus 40 DEG C; D. soaking stage of the radiant tube: keeping the temperature of the band steel to be 870 DEG C+/-60 DEG C by the electric radiant tube, and controlling the dew point to be less than or equal to minus 40 DEG C; E. spray cooling stage: introducing compressed air by a spray cooling fan at the spray cooling stage so as to enable the surface of the band steel to be oxidized evenly, and finally cooling the band steel to be 140 DEG C+/-20 DEG C by the spray cooling fan; and F. discharging from a furnace: cooling the band steel to be 80 DEG C+/-20 DEG C through a furnace nose, and discharging from the furnace. The process is used for producing the cold rolling non-oriented electrical steel bands by utilizing an existing band steel continuous annealing and galvanizing common production lines of iron and steel enterprises, and the costs of capital, equipment and production are reduced effectively.
Description
Technical field
The present invention relates to a kind of production technique of non-oriented electrical steel, especially a kind of annealing technology of cold rolling non-oriented electrical steel.
Background technology
Electrical steel also claims siliconized plate, is the indispensable important non-retentive alloy of electric power, electronics and war industry, is also the Metallic Functional Materials of output maximum, mainly is used as the iron core of various motors, generator and transformer.Non-oriented electrical steel is according to certain production technique, forms the electrical steel of non orientation deformation texture (crystalline texture).Cold rolling non-oriented electrical steel is the non-oriented electrical steel that adopts cold-rolling process to produce, and topmost purposes is the manufacture for generator, motor.
The cold rolling non-oriented electrical steel annealing operation normally adopts the special-purpose anneling production line production of electrical steel.Common band steel continuous annealing+zinc-plated sharing production line be in the cold rolling production of iron and steel enterprise in conventional production line, annealing and zinc-plated production that it is mainly used in common steel grade, also do not have and utilize the technology report of producing cold rolling non-oriented electrical steel with steel continuous annealing+zinc-plated sharing production line.The construction costs of generally building electrical steel specialty annealed wire is 1～1.5 hundred million yuan, and equipment is installed, initial failure period is about 2 years.And the market value of electrical steel changes comparatively fast, and alter a great deal.Sometimes before annealed wire is built, profit is quite high, and profitless saying after building up, this situation has greatly limited popularization and the sale of product; And high building of production line expense can raise the production cost of cold rolling non-oriented electrical steel undoubtedly.Therefore, there are many weak points that the rigging up and debugging time is long, equipment cost is high, the product cost is high in the production method of existing cold rolling non-oriented electrical steel.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of annealing process that utilizes the common cold rolling non-oriented electrical steel of the production with steel continuous annealing+zinc-plated sharing production line.
For solving the problems of the technologies described above, the technical solution used in the present invention is: described annealing operation adopts band steel continuous annealing+zinc-plated sharing production line production, and the processing condition of described annealing operation are:
A, preheating section: the band steel is preheating to 190 ℃ ± 40 ℃;
The heating of B, direct combustion section: the band steel by open firing to 700 ℃ ± 60 ℃;
C, radiator tube heating: the band steel continues to be heated to 780 ℃ ± 60 ℃ by radiator tube; Dew point is controlled at≤and-40 ℃;
D, radiator tube soaking zone: the band steel is incubated at 870 ℃ ± 60 ℃ by electric radiant tube; Dew point is controlled at≤and-40 ℃;
E, spray cold section: the spray cold blast engine cold section of spray passes into pressurized air, makes the even oxidation of belt steel surface; The band steel is sprayed cold blast engine and finally is cooled to 140 ± 20 ℃;
F, come out of the stove: the band steel is cooled to 80 ℃ ± 20 ℃ to come out of the stove through the stove nose.
Process speed with steel in annealing operation of the present invention is 50～110m/min.
The cold section compressed-air actuated pressure passed into of annealing operation spray of the present invention is 2.5～6.0kg.
In annealing operation of the present invention, the band steel has nitrogen, hydrogen protection gas to be protected all the time.In described nitrogen hydrogen protection gas, the volume percent of hydrogen is 8～10%, and the flow of hydrogen is 55～92m
3/ h, the flow of nitrogen is 520～830m
3/ h.Control for Oxygen Content in described nitrogen is at≤9.99ppm.
Cold-rolled steel strip continuous annealing+galvanization production line of the present invention is similar with the effect of the special-purpose continuous annealing line of electrical steel, all in annealing furnace, to make to be with steel to eliminate work hardening, complete recrystallization annealing, promote grain growth, make to reach with steel the electromagnetic performance of customer requirements; Reduce intensity and hardness, make to reach with steel the mechanical property of customer requirements.But because each segment length of annealing furnace of production line, temperature etc. exist very big difference with the electrical steel special production line, need to carry out necessary significant improvement at aspects such as annealing temperature, annealing time, furnace temperature, strip speeds, with guarantee product, electromagnetic performance, mechanical property and surface quality reach user's service requirements.The present invention is a kind of feeling free to try, and it will, for existing apparatus for production line characteristics, carry out larger adjustment to existing annealing furnace technique.Based on above-mentioned requirements, the band steel wire speed provided in principle of work, constructional feature, heating cycle and product mix according to continuous annealing furnace is formulated cold rolling non-oriented electrical steel annealing simulated experiment scheme, by the analysis mode experimental data of scientific system and the work of novelty, study and define out this production method.
The beneficial effect that adopts technique scheme to produce is: the inventive method is improved for the annealing process of existing continuous annealing+zinc-plated sharing production line, make it to utilize the existing ordinary band steel continuous annealing of enterprise+zinc-plated sharing production line to produce the cold rolling non-oriented electrical steel band, do not need equipment is carried out to any transformation, greatly expanded the function of existing production line, and the fund cost, production cost and the equipment cost that have effectively reduced cold rolling non-oriented electrical steel are low, have effectively shortened the equipment debugging time.
The present invention eliminates the strain of cold rolling generation and promotes grain growth by recrystallize, to meet the composite requests such as the whole electromagnetic performance of cold rolling full-technique non-oriented electrical steel band, hardness, mechanical property.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
Embodiment 1: the annealing process of this production cold rolling non-oriented electrical steel adopts following processing step.
Production kind: 50W1000, specification: 0.5*1200mm.Adopt band steel continuous annealing+zinc-plated bridging line, annealing process procedure: the travelling speed of producing the tape steel is 65m/min, the band steel enters in annealing furnace after cleaning, after preheating section is preheating to 182 ℃, the band steel enters the direct combustion section by open firing to 698 ℃, be heated to 785 ℃ through radiator tube heating zone steel, radiator tube soaking section strip steel is by the electric radiant tube insulation at 858 ℃, and the dew point of radiator tube heating and radiator tube soaking zone all is controlled at-40 ℃; Be cooled to 146 ℃ through the cold section strip steel of spray, spraying the cold section compressed-air actuated pressure passed into is 3.0kg; 67 ℃ of tapping temperatures.Shielding gas: the flow of hydrogen is 70m
3/ h, the flow of nitrogen is 701m
3/ h, the Control for Oxygen Content in nitrogen is at 9.99ppm; The dew point of direct combustion section :-39.61 ℃.The electromagnetic performance of the 50W1000 cold rolling non-oriented electrical steel obtained after above-mentioned annealing temperature system is processed: iron loss P
1.57.65W/Kg, magnetic induction density B
50001.70T examination criteria is GB/T13789-92; Mechanical property with steel: R
m335N/mm
2, A
5031.5%, examination criteria is GB/T228.1-2010.
Embodiment 2: the annealing process of this production cold rolling non-oriented electrical steel adopts following processing step.
Production kind: 50W800, specification: 0.5*1200mm.Adopt band steel continuous annealing+zinc-plated bridging line, annealing process procedure: the travelling speed of producing the tape steel is 56m/min, the band steel is after cleaning, the band steel enters in stove, after preheating section is preheated to 191 ℃, the band steel enters the direct combustion section by open firing to 721 ℃, through radiator tube heating zone steel, is heated to 811 ℃, the insulation of radiator tube soaking section strip steel is at 870 ℃, and the dew point of radiator tube heating and radiator tube soaking zone all is controlled at-42 ℃; Be cooled to 150 ℃ through the cold section strip steel of spray, spraying the cold section compressed-air actuated pressure passed into is 4.0kg; 80 ℃ of tapping temperatures.Shielding gas: the flow of hydrogen is 80m
3/ h, the flow of nitrogen is 810m
3/ h, the Control for Oxygen Content in nitrogen is at 9.98ppm; The dew point of direct combustion section :-39.23 ℃.The electromagnetic performance of the 50W800 cold rolling non-oriented electrical steel obtained after above-mentioned annealing temperature system is processed: iron loss P
1.55.9W/Kg, magnetic induction density B
50001.69T examination criteria is GB/T 13789-92; Mechanical property with steel: R
m349N/mm
2, A
5028%, examination criteria is GB/T228.1-2010.
Embodiment 3: the annealing process of this production cold rolling non-oriented electrical steel adopts following processing step.
Production kind: 50W1300, specification: 0.5*1200mm.Adopt band steel continuous annealing+zinc-plated bridging line, annealing process procedure: the travelling speed of producing the tape steel is 75m/min, the band steel is after cleaning, the band steel enters in stove, after preheating section is preheated to 180 ℃, the band steel enters the direct combustion section by open firing to 690 ℃, be heated to 780 ℃ through radiator tube heating zone steel, the insulation of radiator tube soaking section strip steel is at 843 ℃, and the dew point of radiator tube heating and radiator tube soaking zone all is controlled at-45 ℃; Be cooled to 143 ℃ through the cold section strip steel of spray, spraying the cold section compressed-air actuated pressure passed into is 6.0kg; 62 ℃ of tapping temperatures.Shielding gas: the flow of hydrogen is 65m
3/ h, the flow of nitrogen is 747m
3/ h, the Control for Oxygen Content in nitrogen is at 9.99ppm; The dew point of direct combustion section :-39.66 ℃.The electromagnetic performance of the 50W1300 cold rolling non-oriented electrical steel obtained after above-mentioned annealing temperature system is processed: iron loss P
1.59.6W/Kg, magnetic induction density B
50001.71T examination criteria is GB/T13789-92; Mechanical property with steel: R
m310N/mm
2, A
5035%, examination criteria is GB/T228.1-2010.
Embodiment 4: the annealing process of this production cold rolling non-oriented electrical steel adopts following processing step.
Production kind: 50W1000, specification: 0.5*1200mm.Adopt band steel continuous annealing+zinc-plated bridging line, annealing process procedure: the travelling speed of producing the tape steel is 50m/min, the band steel enters in annealing furnace after cleaning, after preheating section is preheating to 150 ℃, the band steel enters the direct combustion section by open firing to 760 ℃, be heated to 840 ℃ through radiator tube heating zone steel, radiator tube soaking section strip steel is by the electric radiant tube insulation at 930 ℃, and the dew point of radiator tube heating and radiator tube soaking zone all is controlled at-41 ℃; Be cooled to 160 ℃ through the cold section strip steel of spray, spraying the cold section compressed-air actuated pressure passed into is 2.5kg; 100 ℃ of tapping temperatures.Shielding gas: the flow of hydrogen is 92m
3/ h, the flow of nitrogen is 830m
3/ h, the Control for Oxygen Content in nitrogen is below 9.99ppm; The dew point of direct combustion section :-39.61 ℃.The electromagnetic performance of the 50W1000 cold rolling non-oriented electrical steel obtained after above-mentioned annealing temperature system is processed: iron loss P
1.57.88W/Kg, magnetic induction density B
50001.70T examination criteria is GB/T13789-92; Mechanical property with steel: R
m328N/mm
2, A
5033.7%, examination criteria is GB/T228.1-2010.
Embodiment 5: the annealing process of this production cold rolling non-oriented electrical steel adopts following processing step.
Production kind: 50W1300, specification: 0.5*1200mm.Adopt band steel continuous annealing+zinc-plated bridging line, annealing process procedure: the travelling speed of producing the tape steel is 110m/min, the band steel is after cleaning, the band steel enters in stove, after preheating section is preheated to 230 ℃, the band steel enters the direct combustion section by open firing to 640 ℃, be heated to 720 ℃ through radiator tube heating zone steel, the insulation of radiator tube soaking section strip steel is at 810 ℃, and the dew point of radiator tube heating and radiator tube soaking zone all is controlled at-43 ℃; Be cooled to 120 ℃ through the cold section strip steel of spray, spraying the cold section compressed-air actuated pressure passed into is 5.0kg; 60 ℃ of tapping temperatures.Shielding gas: the flow of hydrogen is 55 m
3/ h, the flow of nitrogen is 520m
3/ h, the Control for Oxygen Content in nitrogen is at 9.99ppm; The dew point of direct combustion section :-39.66 ℃.The electromagnetic performance of the 50W1300 cold rolling non-oriented electrical steel obtained after above-mentioned annealing temperature system is processed: iron loss P
1.58.9W/Kg, magnetic induction density B
50001.69T examination criteria is GB/T13789-92; Mechanical property with steel: R
m322N/mm
2, A
5031.4%, examination criteria is GB/T228.1-2010.
Claims (6)
1. an annealing process of producing cold rolling non-oriented electrical steel is characterized in that: annealing operation adopts band steel continuous annealing and zinc-plated bridging line, and the processing condition of described annealing operation are:
A, preheating section: the band steel enters in annealing furnace and is preheating to 190 ℃ ± 40 ℃;
The heating of B, direct combustion section: the band steel by open firing to 700 ℃ ± 60 ℃;
C, radiator tube heating: the band steel continues to be heated to 780 ℃ ± 60 ℃ by radiator tube; Dew point is controlled at≤and-40 ℃;
D, radiator tube soaking zone: the band steel is incubated at 870 ℃ ± 60 ℃ by electric radiant tube; Dew point is controlled at≤and-40 ℃;
E, spray cold section: the spray cold blast engine cold section of spray passes into pressurized air, makes the even oxidation of belt steel surface; The band steel is sprayed cold blast engine and finally is cooled to 140 ± 20 ℃;
F, come out of the stove: the band steel is cooled to 80 ℃ ± 20 ℃ to come out of the stove through the stove nose.
2. the production method of cold rolling non-oriented electrical steel according to claim 1, it is characterized in that: the process speed with steel in described annealing operation is 50～110m/min.
3. the annealing process of production cold rolling non-oriented electrical steel according to claim 1, it is characterized in that: cold section compressed-air actuated pressure passed into of described spray is 2.5～6.0kg.
4. according to the annealing process of claim 1,2 or 3 described production cold rolling non-oriented electrical steels, it is characterized in that: in described annealing furnace, the band steel has nitrogen, hydrogen protection gas to be protected all the time.
5. the annealing process of production cold rolling non-oriented electrical steel according to claim 4 is characterized in that: in described nitrogen, hydrogen protection gas, the volume percent of hydrogen is 8～10%, and the flow of hydrogen is 55～92m
3/ h, the flow of nitrogen is 520～830m
3/ h.
6. the annealing process of production cold rolling non-oriented electrical steel according to claim 5 is characterized in that: the Control for Oxygen Content in described nitrogen is at≤9.99ppm.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962703A (en) * | 2015-06-04 | 2015-10-07 | 马钢(集团)控股有限公司 | Electrical steel hydrogen ion reduction method |
| CN105567945A (en) * | 2014-11-03 | 2016-05-11 | 百德福钢带有限公司 | Metallic strip and method of production thereof |
| CN106119477A (en) * | 2016-08-25 | 2016-11-16 | 广东华冠新型材料有限公司 | Reducing atmosphere method for building up and continuous annealing process for continuous annealing process |
| WO2017086036A1 (en) * | 2015-11-20 | 2017-05-26 | Ｊｆｅスチール株式会社 | Process for producing non-oriented electromagnetic steel sheet |
| JP2017101315A (en) * | 2015-11-20 | 2017-06-08 | Ｊｆｅスチール株式会社 | Manufacturing method of non-oriented electromagnetic steel sheet |
| JP2017106073A (en) * | 2015-12-09 | 2017-06-15 | Ｊｆｅスチール株式会社 | Manufacturing method of non-oriented electromagnetic steel sheet |
| CN110079647A (en) * | 2019-06-20 | 2019-08-02 | 常熟科弘材料科技有限公司 | A kind of zincincation of thin gauge household electrical appliances DX51D galvanized sheet |
| CN111270123A (en) * | 2020-02-17 | 2020-06-12 | 本钢板材股份有限公司 | Method for optimizing electromagnetic performance of non-oriented silicon steel and non-oriented silicon steel |
| CN111575451A (en) * | 2020-04-28 | 2020-08-25 | 江油市瑞隆精密材料有限公司 | Cold-rolled strip steel continuous annealing process with energy-saving effect |
| CN111926171A (en) * | 2020-08-31 | 2020-11-13 | 武汉钢铁有限公司 | Continuous annealing cooling control method for cold-rolled non-oriented silicon steel strip |
| CN113046674A (en) * | 2021-03-31 | 2021-06-29 | 常熟科弘材料科技有限公司 | Preparation process of thin hot-dip galvanized steel plate and thin hot-dip galvanized steel plate |
| CN115505695A (en) * | 2022-09-27 | 2022-12-23 | 中冶南方（武汉）热工有限公司 | Annealing furnace for non-oriented silicon steel with extremely-thin specification |
| WO2023079922A1 (en) * | 2021-11-02 | 2023-05-11 | Ｊｆｅスチール株式会社 | Finish annealing facility for electromagnetic steel sheet, finish annealing method and production method for electromagnetic steel sheet, and non-oriented electromagnetic steel sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105567945A (en) * | 2014-11-03 | 2016-05-11 | 百德福钢带有限公司 | Metallic strip and method of production thereof |
| CN104962703A (en) * | 2015-06-04 | 2015-10-07 | 马钢(集团)控股有限公司 | Electrical steel hydrogen ion reduction method |
| US11225699B2 (en) | 2015-11-20 | 2022-01-18 | Jfe Steel Corporation | Method for producing non-oriented electrical steel sheet |
| WO2017086036A1 (en) * | 2015-11-20 | 2017-05-26 | Ｊｆｅスチール株式会社 | Process for producing non-oriented electromagnetic steel sheet |
| JP2017101315A (en) * | 2015-11-20 | 2017-06-08 | Ｊｆｅスチール株式会社 | Manufacturing method of non-oriented electromagnetic steel sheet |
| JP2017106073A (en) * | 2015-12-09 | 2017-06-15 | Ｊｆｅスチール株式会社 | Manufacturing method of non-oriented electromagnetic steel sheet |
| WO2017098800A1 (en) * | 2015-12-09 | 2017-06-15 | Ｊｆｅスチール株式会社 | Non-directional electromagnetic steel sheet manufacturing method |
| CN106119477A (en) * | 2016-08-25 | 2016-11-16 | 广东华冠新型材料有限公司 | Reducing atmosphere method for building up and continuous annealing process for continuous annealing process |
| CN106119477B (en) * | 2016-08-25 | 2018-07-10 | 华冠新型材料股份有限公司 | For the reducing atmosphere method for building up and continuous annealing process of continuous annealing process |
| CN110079647A (en) * | 2019-06-20 | 2019-08-02 | 常熟科弘材料科技有限公司 | A kind of zincincation of thin gauge household electrical appliances DX51D galvanized sheet |
| CN111270123A (en) * | 2020-02-17 | 2020-06-12 | 本钢板材股份有限公司 | Method for optimizing electromagnetic performance of non-oriented silicon steel and non-oriented silicon steel |
| CN111575451A (en) * | 2020-04-28 | 2020-08-25 | 江油市瑞隆精密材料有限公司 | Cold-rolled strip steel continuous annealing process with energy-saving effect |
| CN111926171A (en) * | 2020-08-31 | 2020-11-13 | 武汉钢铁有限公司 | Continuous annealing cooling control method for cold-rolled non-oriented silicon steel strip |
| CN111926171B (en) * | 2020-08-31 | 2022-04-29 | 武汉钢铁有限公司 | Continuous annealing cooling control method for cold-rolled non-oriented silicon steel strip |
| CN113046674A (en) * | 2021-03-31 | 2021-06-29 | 常熟科弘材料科技有限公司 | Preparation process of thin hot-dip galvanized steel plate and thin hot-dip galvanized steel plate |
| WO2023079922A1 (en) * | 2021-11-02 | 2023-05-11 | Ｊｆｅスチール株式会社 | Finish annealing facility for electromagnetic steel sheet, finish annealing method and production method for electromagnetic steel sheet, and non-oriented electromagnetic steel sheet |
| JP7529131B2 (en) | 2021-11-02 | 2024-08-06 | Ｊｆｅスチール株式会社 | Finish annealing equipment for non-oriented electrical steel sheets, finish annealing method for non-oriented electrical steel sheets, and manufacturing method thereof |
| CN115505695A (en) * | 2022-09-27 | 2022-12-23 | 中冶南方（武汉）热工有限公司 | Annealing furnace for non-oriented silicon steel with extremely-thin specification |
| CN115505695B (en) * | 2022-09-27 | 2023-11-03 | 中冶南方（武汉）热工有限公司 | Non-oriented silicon steel annealing furnace with extremely thin specification |
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Application publication date: 20131218 |