CN105779731A - Hot-rolled plate normalizing process for improving electromagnetic performance of low-grade non-oriented electrical steel - Google Patents
Hot-rolled plate normalizing process for improving electromagnetic performance of low-grade non-oriented electrical steel Download PDFInfo
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Abstract
The invention provides a hot-rolled plate normalizing process for improving the electromagnetic performance of low-grade non-oriented electrical steel. According to the hot-rolled plate normalizing process, the furnace temperature of the non-oxidation section of a normalizing furnace is rapidly raised to design temperature, the coefficient of excess air is controlled, and then heating at the last part of the non-oxidation section and in other follow-up sections of the normalizing furnace is stopped for ventilation and cooling; the plate temperature at the outlet of the final section of the normalizing furnace is controlled to be 650 DEG C or below; and the temperature of the water-spraying cooling section for strip steel tapping from the normalizing furnace is controlled to be 500 DEG C or below. The hot-rolled plate normalizing process provided by the invention has the advantages that a normalizing process control method for rapidly heating and slowly cooling of a non-oriented silicon steel hot-rolled plate are adopted for normalizing annealing treatment on a low-grade non-oriented silicon steel hot-rolled plate, so that the proportion of favorable textures (100 and 110) in such steel plate can be obviously increased, second-phase particles which exist in the steel plate and inhibit the growth of crystalline grains can be obviously reduced, and the performance of a finished product can be obviously improved.
Description
Technical field
The present invention relates to the production method of electrical steel product, particularly to the normalizing process of efficient low code non-oriented electrical steel, it is adaptable to the production of efficient low grade cold rolling non-oriented electrical steel product.
Background technology
Along with increasingly sharpening of energy crisis, the energy consumption index of electronic product is had higher requirement by countries in the world, just develops towards miniaturization, high precision int, high efficiency direction, and the iron core manufactured with common cold-reduced silicon sheet is difficult to meet requirement.
High-efficiency non-oriented electrical sheet is relative to common non-oriented electrical steel; when ensureing that mechanical property is excellent equally; General Promotion electromagnetic performance; namely iron loss is low, magnetic strength is high; meeting that the electronic products such as compressor, general-purpose machine, mains transformer, precision electric motor are energy-efficient and the demand for development of miniaturization, low grade non-oriented silicon steel hot rolled plate reaches high efficiency products performance level by normalizing operation.Normalizing makes hot rolled plate microstructure homogenization, and finished product crystallite dimension is thick, reduces magnetic hystersis loss, but excessive crystal grain can increase high frequency eddy current losses, and the selection of therefore normalizing temperature is critically important.
At present; low code non-oriented electrical steel both domestic and external has part high-end product to adopt Hot Rolled Plate Normalizing technique; contrast has relatively low core loss value and higher magnetic strength value with grade electric steel; and electromagnetic performance is relatively stable; the potentiality that steel grade is inherent are given full play to; but each stove Duan Jun of conventional high-performance normalizing process normalizing furnace is heated, and energy consumption is higher.Need it is carried out further technology exploration
Summary of the invention
It is an object of the invention to provide the Hot Rolled Plate Normalizing technique of a kind of efficient low code non-oriented electrical steel, realize end properties reach efficient material level by controlling Hot Rolled Plate Normalizing unit each stove section temperature and the type of cooling.
The object of the present invention is achieved like this:
Improve the Hot Rolled Plate Normalizing technique of low code non-oriented electrical steel electromagnetic performance; control normalizing furnace non-oxidation section furnace temperature and be heated rapidly to design temperature; control coefficient of excess air simultaneously; heat and ventilating and cooling at non-oxidation furnace final stage and each section of stopping later subsequently; normalizing furnace latter end exit plate temperature control is below 650 DEG C, and strip steel goes out normalizing furnace Water spray cooling section temperature and controls below 500 DEG C.
The speed that described normalizing furnace temperature quickly heats is 15～30 DEG C/s, and the speed of described logical cooling air Slow cooling is 2～6 DEG C/s.
The percentage by weight of the hot rolled plate chemical composition improving the Hot Rolled Plate Normalizing technique employing of low code non-oriented electrical steel electromagnetic performance is: C < 0.0035%; Si:0.20%～0.95%; Mn:0.15%～0.50%; P:0.01%～0.15%; S < 0.006%; N≤0.0030%, Als:0.20%～0.45%, Ti, Nb, V difference < 0.0020%；All the other are Fe and other inevitable impurity.
Concrete technology of the present invention is as follows:
A. hot rolled plate thickness: 2.0～3.0mm；
B. Edge Heating device puts into, and makes steel plate be heated evenly；
C. weld seam annealing: heat time heating time 30～80s, eliminate stress, it is prevented that strip steel running band of discontinuance；
D. ball blast pickling:
After shot-blasting machine ball blast, plate surface quality reaches Sa=2.0, and pickling is come into operation.
HCL concentration 4.5%-5%；
Require every results of regular determination HCl concentration, HCl liquid iron salt content；
HCL liquid temp 80 ± 5 DEG C；
E. unit speed: 25～50m/min；
F. normalizing furnace controls parameter such as table 1.
Table 1 normalizing furnace controls parameter
The speed that normalizing furnace temperature quickly heats is 15～30 DEG C/s, and the speed of described logical cooling air Slow cooling is 2～6 DEG C/s.
G. strip steel tapping temperature: control steel plate tapping temperature less than 550 DEG C.
Hot Rolled Plate Normalizing of the present invention annealing adopts quickly heating, uniform speed slow cools down, plate temperature is made to reach controlling value within a short period of time, heat and logical cooling air Slow cooling at non-oxidation furnace final stage and each section of stopping later subsequently, the crystal grain sufficient time is made uniformly to grow up, Secondary phase particle (MnS TiN TiC the compound Secondary phase particle such as AlN) alligatoring, it is that hot rolled plate forms favourable (100) texture after cold rolling in re-annealing process, and in cold rolled sheet continuous annealing process, reduce the Secondary phase particle hindering recrystallization with grain growth, crystal grain is made fully to grow up, obtain high magnetic strength, the electromagnetic performance of low iron loss.
Hot band grain size is more big, and in cold roller and deformed tissue, shear band distribution density is more high, and in finished product, goss texture intensity is more big.In the present invention, normalizing furnace temperature stops heating after being heated rapidly to design steel billet temperature; subsequently by the logical cooling air slow cooling of radial canal; control 2# and radiate the plate temperature of pipeline section outlet below 650 DEG C; be conducive to Secondary phase particle in hot rolled plate (MnS TiN TiC the compound Secondary phase particle such as AlN) alligatoring grow up; reduce the inhibition of the recrystallization in annealing process and grain growth, be conducive to the further lifting of electromagnetic performance.In the technical program, strip steel goes out normalizing furnace Water spray cooling section temperature and controls below 500 DEG C, and compared with conventional tapping temperature about 760 DEG C, temperature is low about 260 DEG C, can avoid precipitating out the tiny Secondary phase particle to detrimental in cooling procedure of coming out of the stove once again.Process system is strictly as the criterion with plate temperature control, it is prevented that band steel oxidation in normalizing process, and the coefficient of excess air of each stove section of NOF is strictly controlled.
Evenly, recrystal grain increases hot rolled plate tissue, grain growth, strengthens (100) and (110) texture component and reduces (111) texture component, improves overall magnetic.When hot rolled plate crystal grain is bigger, cold rolling deformed microstructure produces more shear band, shear band has more energy storage, shear band is more readily formed during recrystallization annealing the goss texture orientation nucleus that magnetic property is favourable.
Beneficial effects of the present invention:
The present invention adopts and non-orientation silicon steel hot rolled plate is quickly heated and the normalizing process control method of Slow cooling, low grade non-oriented silicon steel hot rolled plate is carried out normalizing annealing process, favorable texture (100) in steel plate, (110) ratio is significantly improved, the second phase particles of obstruction grain growth therein has obvious reduction, make end properties obtain to be obviously improved, after cold rolling 0.5mm cold-reduced sheet, with conventional Hot Rolled Plate Normalizing with compared with grade non-oriented silicon steel, iron loss on average reduces 0.30W/Kg, magnetic strength on average improves 0.020T, reach the electromagnetic performance level in the world with grade non-oriented silicon steel.
Adopt the mode of the then Slow cooling of being rapidly heated can gas saving energy consumption more than 5% to non-orientation silicon steel Hot Rolled Plate Normalizing annealing process; gas consumption 400 yuan calculating pressed by ton steel; per ton reduction consumes 20 yuan, by producing 100000 tons of calculating per year, and every year can be energy-conservation more than 2,000,000 yuan.Utilize the motor that high performance non-oriented magnetic steel sheet produces can save substantial amounts of electric energy, the volume of motor, saving steel can also be reduced simultaneously, reach the effect of efficient economizing.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail:
Embodiment 1:C:0.0030%, Si:0.30%, Mn:0.20%, P:0.015%, S:0.0026%, Als:0.43%, N:0.0019%, Ti:0.0015%, Nb:0.0018%, V:0.0014%；All the other are ferrum and other inevitable impurity element.
Concrete technology is as follows:
A. hot rolled plate thickness: 2.2mm；
B. Edge Heating device puts into；
C. weld seam annealing: heat time heating time 40s；
D. ball blast pickling
After shot-blasting machine ball blast, plate surface quality reaches Sa=2.0, HCL concentration 4.5%；
E. unit speed 35m/min；
F. embodiment 1 normalizing furnace controls parameter such as table 2.
Table 2 embodiment 1 normalizing furnace controls parameter
The intensification average speed of non-oxidation section strip steel is 21.3 DEG C/s, average speed of lowering the temperature is 2.82 DEG C/s.
G. strip steel is come out of the stove steel billet temperature: 540 DEG C.
Comparative example 1: except normalizing annealing Control for Kiln Temperature, chemical composition is all identical with embodiment 1 with other technique, and comparative example 1 normalizing furnace controls parameter such as table 3:
Table 3 comparative example 1 normalizing furnace controls parameter
The intensification average speed of strip steel is 11.2 DEG C/s, average speed of lowering the temperature is 2.0 DEG C/s
Strip steel is come out of the stove steel billet temperature: 745 DEG C
Embodiment 2:C:0.0028%, Si:0.61%, Mn:0.18%, P:0.020%, S:0.0028%, Als:0.40%, N:0.0022%, Ti:0.0013%, Nb:0.0015%, V:0.0018%；All the other are ferrum and other inevitable impurity element.
Concrete technology is as follows:
A. hot rolled plate thickness: 2.3mm；
B. Edge Heating device puts into；
C. weld seam annealing: heat time heating time 45s；
D. ball blast pickling
After shot-blasting machine ball blast, plate surface quality reaches Sa=2.0, HCL concentration 4.8%；
E. unit speed 35m/min；
F. embodiment 2 normalizing furnace controls parameter such as table 4
Table 4 embodiment 2 normalizing furnace controls parameter
The programming rate of non-oxidation section strip steel is 21.3 DEG C/s, cooling rate is 2.75 DEG C/s
G. strip steel is come out of the stove steel billet temperature: 550 DEG C.
Comparative example 2: except normalizing annealing Control for Kiln Temperature, chemical composition and other technique all with
Embodiment 2 is identical, and comparative example 2 normalizing furnace controls parameter such as table 5:
Table 5 comparative example 2 normalizing furnace controls parameter
The programming rate of strip steel is 11.3 DEG C/s, cooling rate is 2.2 DEG C/s
Strip steel is come out of the stove steel billet temperature: 730 DEG C.
Embodiment 3:C:0.0026%, Si:0.85%, Mn:0.22%, P:0.025%, S:0.0035%, Als:0.36%, N:0.0021%, Ti:0.0015%, Nb:0.0020%, V:0.0015%；All the other are ferrum and other inevitable impurity element.
Concrete technology is as follows:
A. hot rolled plate thickness: 2.3mm；
B. Edge Heating device puts into；
C. weld seam annealing: heat time heating time 40s；
D. ball blast pickling
After shot-blasting machine ball blast, plate surface quality reaches Sa=2.0, HCL concentration 4.5%；
E. unit speed 35m/min；
F. embodiment 3 normalizing furnace controls parameter such as table 6
Table 6 embodiment 3 normalizing furnace controls parameter
The programming rate of non-oxidation section strip steel is 21.3 DEG C/s, cooling rate is 2.78 DEG C/s.
G. strip steel is come out of the stove steel billet temperature: 545 DEG C.
Comparative example 3: except normalizing annealing Control for Kiln Temperature, chemical composition is all identical with embodiment 3 with other technique, and comparative example 3 normalizing furnace controls parameter such as table 7:
Table 7 comparative example 3 normalizing furnace controls parameter
The programming rate of strip steel is 11.3 DEG C/s, cooling rate is 2.1 DEG C/s
Strip steel is come out of the stove steel billet temperature: 740 DEG C
Non-orientation silicon steel hot rolled plate is rolled into the cold-reduced sheet that thickness is 0.5mm after overpickling steel rolling, and then through obtaining following electromagnetic performance after continuous annealing, after finished products, electromagnetic performance is in Table 8.
Electromagnetic performance after table 8 finished products
Being can be seen that compared with comparative example that by embodiment the electromagnetic performance of embodiment is significantly improved, iron loss reduces more than 0.3W/Kg, and magnetic strength improves more than 0.015T, and effect is obvious.
Claims (3)
1. the Hot Rolled Plate Normalizing technique improving low code non-oriented electrical steel electromagnetic performance; it is characterized in that: control normalizing furnace non-oxidation section furnace temperature and be heated rapidly to design temperature; control coefficient of excess air simultaneously; heat and ventilating and cooling at non-oxidation furnace final stage and each section of stopping later subsequently; normalizing furnace latter end exit plate temperature control is below 650 DEG C, and strip steel goes out normalizing furnace Water spray cooling section temperature and controls below 500 DEG C.
2. the Hot Rolled Plate Normalizing technique of the low code non-oriented electrical steel electromagnetic performance of raising according to claim 1, it is characterised in that: the speed that described normalizing furnace temperature quickly heats is 15～30 DEG C/s, and the speed of described logical cooling air Slow cooling is 2～6 DEG C/s.
3. the Hot Rolled Plate Normalizing technique of the low code non-oriented electrical steel electromagnetic performance of raising according to claim 1; it is characterized in that: the percentage by weight of hot rolled plate chemical composition is: C < 0.0035%; Si:0.20%～0.95%; Mn:0.15%～0.50%; P:0.01%～0.15%, S < 0.006%, N≤0.0030%; Als:0.20%～0.45%, Ti, Nb, V difference < 0.0020%；All the other are Fe and other inevitable impurity.
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Cited By (5)
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| CN106676237A (en) * | 2016-12-14 | 2017-05-17 | 北京首钢股份有限公司 | Method for eliminating non-oriented electrical steel surface crack defects |
| CN112501407A (en) * | 2020-11-30 | 2021-03-16 | 武汉钢铁有限公司 | Non-oriented silicon steel plate for high-efficiency variable-frequency compressor and production method thereof |
| CN115135788A (en) * | 2020-02-20 | 2022-09-30 | 日本制铁株式会社 | Hot-rolled steel sheet for non-oriented electrical steel sheet, and method for producing same |
| WO2022219742A1 (en) * | 2021-04-14 | 2022-10-20 | 日本製鉄株式会社 | Hot-rolled steel sheet for non-oriented electrical steel sheet and method for manufacturing same |
| WO2022262020A1 (en) * | 2021-06-17 | 2022-12-22 | 江苏省沙钢钢铁研究院有限公司 | Non-oriented silicon steel and production method therefor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106676237A (en) * | 2016-12-14 | 2017-05-17 | 北京首钢股份有限公司 | Method for eliminating non-oriented electrical steel surface crack defects |
| CN115135788A (en) * | 2020-02-20 | 2022-09-30 | 日本制铁株式会社 | Hot-rolled steel sheet for non-oriented electrical steel sheet, and method for producing same |
| CN112501407A (en) * | 2020-11-30 | 2021-03-16 | 武汉钢铁有限公司 | Non-oriented silicon steel plate for high-efficiency variable-frequency compressor and production method thereof |
| WO2022219742A1 (en) * | 2021-04-14 | 2022-10-20 | 日本製鉄株式会社 | Hot-rolled steel sheet for non-oriented electrical steel sheet and method for manufacturing same |
| WO2022262020A1 (en) * | 2021-06-17 | 2022-12-22 | 江苏省沙钢钢铁研究院有限公司 | Non-oriented silicon steel and production method therefor |
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Application publication date: 20160720 |