CN102634729B - Preparation method for low-iron-loss, high-induction and high-mark non-oriented silicon steel - Google Patents
Preparation method for low-iron-loss, high-induction and high-mark non-oriented silicon steel Download PDFInfo
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Abstract
The invention discloses a preparation method for low-iron-loss, high-induction and high-mark non-oriented silicon steel. The low-iron-loss, high-induction and high-mark non-oriented silicon steel includes, in mass percent, lower than or equal to 0.05% of C, from 3.0 to 3.4% of Si, from 0.25 to 0.40% of Mn, lower than or equal to 0.003% of S, lower than or equal to 0.004% of N, from 0.5 to 0.8% of Al, from 0.05 to 0.09% of Sn, from 0.001 to 0.003% of Ca and the balance Fe and unavoidable impurities. The components are cast to obtain a casting blank, the casting blank is in hot rolling, normalizing, pickling and primary cold rolling to form a steel strip with the thickness of 0.8mm, the steel strip with the thickness of 0.8mm is in intermediate annealing and secondary cold rolling to form a steel strip with the thickness of 0.35mm, and the steel strip with the thickness of 0.35mm is coated to form a finished steel strip. The silicon steel prepared by the method is low in iron loss and high in induction, the normalizing temperature and the intermediate annealing temperature in a preparation process are low, and edge cracks and strip breakage which are caused during cold rolling of high Si products are effectively avoided.
Description
Technical field
The present invention relates to the non-oriented electrical steel production technical field, particularly a kind of preparation method of low-iron loss high-magnetic strength high grade non-oriented silicon steel.
Background technology
High grade non-oriented electrical steel not only is applied to make large and medium-sized waterpower, thermoelectric generator, and along with popularizing of higher in recent years power-saving technology requirement and converter technique, it also is widely used in the manufacturing of frequency conversion refrigerator and compressor of air conditioner.Frequency conversion not only has conventional P to the expansion of range of frequency to electrical steel
10/50, B
5000Requirement, more having proposed the core loss property under the 400Hz is P
10/400Requirement, particularly air-conditioning and refrigerator, these indexs become the important factor that determines its efficiency grade.Therefore, the high grade electric steel of low-iron loss high-magnetic strength is not only the ideal material of large and middle size motor, also is the best selection that frequency-conversion domestic electric appliances is used compressor, and consumption increases just fast.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of low-iron loss high-magnetic strength high grade non-oriented silicon steel, by reasonable control composition, select suitable technology, give full play to the advantage of each composition, the nothing that obtains to have excellent magnetic characteristics orientation finished product steel belt.
For solving the problems of the technologies described above, the preparation method of a kind of low-iron loss high-magnetic strength high grade non-oriented silicon steel provided by the invention, by percentage to the quality: C≤0.005%, Si3.0-3.4%, Mn0.25-0.40%, S≤0.003%, N≤0.004%, Al0.5-0.8%, Sn0.05-0.09%, Ca0.001-0.003%, all the other are Fe and unavoidable impurities, will be prepared through following processing step and technical parameter by the strand that the mentioned component casting obtains:
1) strand is heated to 1080-1120 ℃, hot rolling behind the insulation 25-45min, finishing temperature is 800-850 ℃ during hot rolling, obtains the steel band that thickness is 2.15-2.35mm;
2) steel band is at pure N
2Carry out normalizing in the continuous annealing furnace under the atmosphere, the normalizing temperature is 840-900 ℃, and soaking time is 4-6 minute;
3) steel band carries out pickling;
4) steel band carries out once cold rolling, and 4 passages are rolling, obtains the steel band that thickness is 0.8mm;
5) steel band is at H
2And N
2Carry out process annealing in the continuous annealing furnace under the mixed-gas atmosphere, annealing temperature is 840-900 ℃, and soaking time 1-4 minute, speed of cooling was not more than 300 ℃/min;
6) steel band carries out secondary cold-rolling, rolls the front spring preheating, and preheating temperature is 100-120 ℃, and 4 passages are rolling, obtains the steel band that thickness is 0.35mm;
7) at H
2And N
2Carry out final annealing in the continuous annealing furnace under the mixed gas atmosphere, annealing temperature is 900-1000 ℃, and soaking time is 0.5-4min, and speed of cooling is not more than 300 ℃/min;
8) make the finished silicon steel band after the steel band coating.
Preferably, step 2) described normalizing temperature is 850-890 ℃, and soaking time is 4.5-5.5 minute.
Preferably, the described process annealing temperature of step 5) is 850-870 ℃, and soaking time is 60-150 second.
Preferably, the described final annealing temperature of step 7) is 950-990 ℃, and soaking time is 60-180 second.
Further, the described H of step 5)
2And N
2The shared volume percent of hydrogen is not less than 20% in the mixed gas.
Further, the described H of step 7)
2And N
2H in the mixed gas
2Shared volume percent is 25-35%.
Further, the described finished product steel belt magnetic property P that makes
15/50=2.221-2.242W/Kg, P
10/400=16.59-16.93W/Kg, B
5000=1.708～1.712T, finished product steel belt average grain size 125-145 μ m.
The preparation method of a kind of low-iron loss high-magnetic strength high grade non-oriented silicon steel provided by the invention; the finished product steel belt template that makes is smooth; iron loss is low, magnetic strength is high; particularly iron loss P10/400 is far below the requirement of frequency-changeable compressor with the 20W/Kg of electrical steel; and the normalizing temperature is low in the preparation process, the process annealing temperature is low, the limit when effectively having avoided high Si product cold rolling is split and belt phenomenon; this finished product steel belt can not only be widely used in large and medium-sized motor manufacturing, also can be widely used in the manufacturing of convertible frequency air-conditioner freezer compressor.
Description of drawings
The silicon steel finished product metallograph that Fig. 1 provides for the embodiment of the invention 2.
Embodiment
The preparation method of a kind of low-iron loss high-magnetic strength high grade non-oriented silicon steel that the embodiment of the invention provides, by percentage to the quality: C≤0.005%, Si3.0-3.4%, Mn0.25-0.40%, S≤0.003%, N≤0.004%, Al0.5-0.8%, Sn0.05-0.09%, Ca0.001-0.003%, all the other are Fe and unavoidable impurities, will be prepared through following processing step and technical parameter by the strand that the mentioned component casting obtains:
1) strand is heated to 1080-1120 ℃, hot rolling behind the insulation 25-45min, finishing temperature is 800-850 ℃ during hot rolling, obtains the steel band that thickness is 2.15-2.35mm;
2) steel band is at pure N
2Carry out normalizing in the continuous annealing furnace under the atmosphere, the normalizing temperature is 840-900 ℃, and soaking time is 4-6 minute;
3) steel band carries out pickling;
4) steel band carries out once cold rolling, and 4 passages are rolling, obtains the steel band that thickness is 0.8mm;
5) steel band is at H
2And N
2Carry out process annealing in the continuous annealing furnace under the mixed-gas atmosphere, annealing temperature is 840-900 ℃, and soaking time 1-4 minute, speed of cooling was not more than 300 ℃/min;
6) steel band carries out secondary cold-rolling, rolls the front spring preheating, and preheating temperature is 100-120 ℃, and 4 passages are rolling, obtains the steel band that thickness is 0.35mm;
7) at H
2And N
2Carry out final annealing in the continuous annealing furnace under the mixed gas atmosphere, annealing temperature is 900-1000 ℃, and soaking time is 0.5-4min, and speed of cooling is not more than 300 ℃/min;
8) make the finished silicon steel band after the steel band coating, finished product steel belt magnetic property P
15/50=2.221-2.242W/Kg, P
10/400=16.59-16.93W/Kg, B
5000=1.708～1.712T, finished product steel belt average grain size 125-145 μ m.
Wherein, step 2) the preferred temperature of normalizing is 850-890 ℃, and preferred soaking time is 4.5-5.5 minute.
Wherein, the preferred temperature of step 5) process annealing is 850-870 ℃, and preferred soaking time is 60-150 second.
Wherein, the preferred temperature of final annealing is 950-990 ℃ in the step 7), and preferred soaking time is 60-180 second.
Wherein, H in the step 5)
2And N
2The shared volume percent of hydrogen is not less than 20% in the mixed gas.
Wherein, H in the step 7)
2And N
2H in the mixed gas
2Shared volume percent is 25%-35%.
Followingly further specify the present invention with comparative example and embodiment.
Embodiment 1
Laboratory strand chemical ingredients (mass percent %) is C:0.0042%, Si:3.15%, Mn:0.32%, S:0.0022%, N:0.0031%, Al:0.69%, Sn:0.078%, Ca:0.0019%, all the other are Fe and unavoidable impurities (seeing Table the embodiment 1 in 1); The strand that satisfies this composition is heated to 1100 ℃, hot rolling behind the insulation 35min, finishing temperature is controlled to be 820 ℃ during hot rolling, obtains the hot rolled strip of thickness 2.2mm; Steel band is at pure N
2Carry out normalizing in the continuous annealing furnace under the atmosphere, the normalizing temperature is 880 ℃, and soaking time is 5 minutes, and the type of cooling is air cooling; Steel band after the normalizing carries out once cold rolling to 0.8mm after pickling, once cold rolling is that 4 passages are rolling; Steel band is at H
2The H of volume percent 30%
2And N
2Carry out process annealing in the continuous annealing furnace of mixed atmosphere, annealing temperature is 860 ℃, and soaking time 90 seconds, speed of cooling are 250 ℃/min; The control of secondary cold-rolling negative deviation, rolling preceding with the steel plate preheating, 110 ℃ of preheating temperatures, 4 passages are rolling, and thickness of strips is 0.35mm behind the secondary cold-rolling; Steel band is at H
2The H of volume percent 30%
2And N
2Carry out final annealing in the continuous annealing furnace of mixed atmosphere, the final annealing temperature is 980 ℃, and soaking time 90 seconds, speed of cooling are 250 ℃/min; Obtain finished product steel belt after the coating, record the magnetic property of finished product steel belt: P
15/50=2.242W/Kg, P
10/400=16.93W/Kg, B
5000=1.712T, average grain size are 132 μ m (seeing Table the embodiment 1 in 2).
Comparative example 1
The chemical ingredients strand of the comparative example 1 in the table 1 is made finished product steel belt through the processing step identical with embodiment 1, record finished product steel belt magnetic property and average grain size and see Table 2.
The chemical ingredients (%) of table 1 experimental steel strand
| C | Si | Mn | S | N | Al | Sn | Ca | |
| Embodiment 1 | 0.0042 | 3.15 | 0.32 | 0.0022 | 0.0031 | 0.69 | 0.078 | 0.0019 |
| Comparative example 1 | 0.0030 | 3.09 | 0.29 | 0.0029 | 0.0025 | 0.97 | / | / |
Table 2 finished product magnetic property table
Embodiment 2
Laboratory strand chemical ingredients (mass percent %) is C:0.0031%, Si:3.22%, Mn:0.28%, S:0.0019%, N:0.0033%, Al:0.73%, Sn:0.073%, Ca:0.0018%, all the other are Fe and unavoidable impurities (seeing Table the embodiment 2 in 3); The strand that satisfies this composition is heated to 1100 ℃, hot rolling behind the insulation 30min, finishing temperature is controlled to be 810 ℃ during hot rolling, obtains the hot rolled strip of thickness 2.3mm; Steel band is at pure N
2Carry out normalizing in the continuous annealing furnace under the atmosphere, the normalizing temperature is 880 ℃, and soaking time is 5 minutes, and the type of cooling is air cooling; Steel band after the normalizing carries out once cold rolling to 0.8mm after pickling, once cold rolling is that 4 passages are rolling; Steel band is at H
2The H of volume percent 30%
2And N
2Carry out process annealing in the continuous annealing furnace of mixed atmosphere, annealing temperature is 860 ℃, and soaking time 120 seconds, speed of cooling are 250 ℃/min; The control of secondary cold-rolling negative deviation, rolling preceding with the steel plate preheating, 110 ℃ of preheating temperatures, 4 passages are rolling, and thickness of strips is 0.35mm behind the secondary cold-rolling; Steel band is at H
2The H of volume percent 30%
2And N
2Carry out final annealing in the continuous annealing furnace of mixed atmosphere, the final annealing temperature is 980 ℃, and soaking time 90 seconds, speed of cooling are 250 ℃/min; Obtain finished product steel belt after the coating, record the magnetic property of finished product steel belt: P
15/50=2.221W/Kg, P
10/400=16.59W/Kg, B
5000=1.708T, average grain size are 137 μ m (seeing Table the embodiment 2 in 4).The metallograph of finished silicon crystalline grain of steel as shown in Figure 1.
Comparative example 2
The chemical ingredients strand of the comparative example 2 in the table 3 is made finished product steel belt through the processing step identical with embodiment 2, record finished product steel belt magnetic property and average grain size and see Table 4.
The chemical ingredients (%) of table 3 experimental steel strand
| Numbering | C | Si | Mn | S | N | Al | Sn | Ca |
| Embodiment 2 | 0.0031 | 3.22 | 0.28 | 0.0019 | 0.0033 | 0.73 | 0.073 | 0.0018 |
| Comparative example 2 | 0.0031 | 3.08 | 0.27 | 0.0021 | 0.0018 | 0.79 | / | / |
Table 4 finished product magnetic property table
Embodiment 3
Laboratory strand chemical ingredients (mass percent %) is C:0.003%, Si:3.23%, Mn:0.31%, S:0.0024%, N:0.0027%, Al:0.55%, Sn:0.083%, Ca:0.0015%, all the other are Fe and unavoidable impurities (seeing Table the embodiment 3 in 5); The strand that satisfies this composition is heated to 1100 ℃, hot rolling behind the insulation 30min, finishing temperature is controlled to be 830 ℃ during hot rolling, obtains the hot rolled strip of thickness 2.3mm; Steel band is at pure N
2Carry out normalizing in the continuous annealing furnace under the atmosphere, the normalizing temperature is 860 ℃, and soaking time is 5 minutes, and the type of cooling is air cooling; Steel band after the normalizing carries out once cold rolling to 0.8mm after pickling, once cold rolling is that 4 passages are rolling; Steel band is at H
2The H of volume percent 30%
2And N
2Carry out process annealing in the continuous annealing furnace of mixed atmosphere, annealing temperature is 870 ℃, and soaking time 110 seconds, speed of cooling are 250 ℃/min; The control of secondary cold-rolling negative deviation, rolling preceding with the steel plate preheating, 110 ℃ of preheating temperatures, 4 passages are rolling, and thickness of strips is 0.35mm behind the secondary cold-rolling; Steel band is at H
2The H of volume percent 30%
2And N
2Carry out final annealing in the continuous annealing furnace of mixed atmosphere, the final annealing temperature is 960 ℃, and soaking time 120 seconds, speed of cooling are 250 ℃/min; Obtain finished product steel belt after the coating, record the magnetic property of finished product steel belt: P
15/50=2.235W/Kg, P
10/400=16.87W/Kg, B
5000=1.710T, average grain size are 128 μ m (seeing Table the embodiment 3 in 6).
Embodiment 4
The chemical ingredients strand of embodiment 4 in the table 5 is made finished product steel belt through the processing step identical with embodiment 3, record finished product steel belt magnetic property and average grain size and see Table 6.
Comparative example 3
The chemical ingredients strand of the comparative example 3 in the table 5 is made finished product steel belt through the processing step identical with embodiment 4 and embodiment 5, record finished product steel belt magnetic property and average grain size and see Table 6.
The chemical ingredients (%) of table 5 experimental steel strand
| Numbering | C | Si | Mn | S | N | Al | Sn | Ca |
| Embodiment 3 | 0.003 | 3.23 | 0.31 | 0.0024 | 0.0027 | 0.55 | 0.083 | 0.0015 |
| Embodiment 4 | 0.0028 | 3.31 | 0.35 | 0.0021 | 0.0026 | 0.60 | 0.063 | 0.0022 |
| Comparative example 3 | 0.0034 | 3.30 | 0.35 | 0.0026 | 0.0029 | 0.62 | / | / |
Table 6 finished product magnetic property table
From table 2, table 4 and table 6 as can be seen, the preparation method of a kind of low-iron loss high-magnetic strength high grade non-oriented silicon steel provided by the invention, the silicon steel finished product magnetic property excellence that makes: P
15/50=2.221-2.242W/Kg, P
10/400=16.59-16.93W/Kg, B
5000=1.708～1.712T, average grain size 125-145 μ m.Not only iron loss is low for this product, magnetic strength is high, and the normalizing temperature is low, the process annealing temperature is low in the preparation process, the limit when effectively having avoided high Si product cold rolling is split and belt phenomenon.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. the preparation method of a low-iron loss high-magnetic strength high grade non-oriented silicon steel, it is characterized in that, by percentage to the quality: C≤0.005%, Si3.0-3.4%, Mn0.25-0.40%, S≤0.003%, N≤0.004%, Al0.5-0.8%, Sn0.05-0.09%, Ca0.001-0.003%, all the other are Fe and unavoidable impurities, will be prepared through following processing step and technical parameter by the strand that the mentioned component casting obtains:
1) strand is heated to 1080-1120 ℃, hot rolling behind the insulation 25-45min, finishing temperature is 800-850 ℃ during hot rolling, obtains the steel band that thickness is 2.15-2.35mm;
2) steel band is at pure N
2Carry out normalizing in the continuous annealing furnace under the atmosphere, the normalizing temperature is 840-900 ℃, and soaking time is 4-6 minute;
3) steel band carries out pickling;
4) steel band carries out once cold rolling, and 4 passages are rolling, obtains the steel band that thickness is 0.8mm;
5) steel band is at H
2And N
2Carry out process annealing in the continuous annealing furnace under the mixed-gas atmosphere, annealing temperature is 840-900 ℃, and soaking time 1-4 minute, speed of cooling was not more than 300 ℃/min;
6) steel band carries out secondary cold-rolling, rolls the front spring preheating, and preheating temperature is 100-120 ℃, and 4 passages are rolling, obtains the steel band that thickness is 0.35mm;
7) at H
2And N
2Carry out final annealing in the continuous annealing furnace under the mixed gas atmosphere, annealing temperature is 900-1000 ℃, and soaking time is 0.5-4min, and speed of cooling is not more than 300 ℃/min;
8) make the finished silicon steel band after the steel band coating.
2. the preparation method of low-iron loss high-magnetic strength high grade non-oriented silicon steel according to claim 1 is characterized in that: step 2) described normalizing temperature is 850-890 ℃, soaking time is 4.5-5.5 minute.
3. the preparation method of low-iron loss high-magnetic strength high grade non-oriented silicon steel according to claim 1, it is characterized in that: the described process annealing temperature of step 5) is 850-870 ℃, soaking time is 60-150 second.
4. the preparation method of low-iron loss high-magnetic strength high grade non-oriented silicon steel according to claim 1, it is characterized in that: the described final annealing temperature of step 7) is 950-990 ℃, soaking time is 60-180 second.
5. the preparation method of low-iron loss high-magnetic strength high grade non-oriented silicon steel according to claim 1 is characterized in that: the described H of step 5)
2And N
2The shared volume percent of hydrogen is not less than 20% in the mixed gas.
6. the preparation method of a kind of low-iron loss high-magnetic strength high grade non-oriented silicon steel according to claim 1 is characterized in that: the described H of step 7)
2And N
2H in the mixed gas
2Shared volume percent is 25-35%.
7. the preparation method of a kind of low-iron loss high-magnetic strength high grade non-oriented silicon steel according to claim 1 is characterized in that: the described finished product steel belt magnetic property P that makes
15/50=2.221-2.242W/kg, P
10/400=16.59-16.93W/kg, B
5000=1.708～1.712T, finished product steel belt average grain size 125-145 μ m.
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| CN103834858B (en) * | 2012-11-23 | 2016-10-05 | 宝山钢铁股份有限公司 | A kind of manufacture method of low iron loss non-orientation silicon steel |
| KR20150073719A (en) * | 2013-12-23 | 2015-07-01 | 주식회사 포스코 | Non-orinented electrical steel sheet and method for manufacturing the same |
| CN104195427A (en) * | 2014-09-11 | 2014-12-10 | 江苏省沙钢钢铁研究院有限公司 | Low-iron-loss high-magnetic-induction non-oriented silicon steel and production method thereof |
| CN104294022A (en) * | 2014-10-10 | 2015-01-21 | 北京科技大学 | Preparation method of high-magnetic-strength thin-gauge non-oriented silicon steel |
| CN106591555B (en) * | 2016-11-02 | 2019-08-20 | 浙江华赢特钢科技有限公司 | A kind of annealing process after non-directional cold-rolling silicon steel disc cold rolling |
| TWI683009B (en) * | 2017-07-19 | 2020-01-21 | 日商日本製鐵股份有限公司 | Non-oriented electrical steel sheet |
| CN110369496B (en) * | 2019-07-09 | 2021-04-27 | 鞍钢股份有限公司 | Cold rolling preheating method for high-grade non-oriented silicon steel |
| CN110369525A (en) * | 2019-07-09 | 2019-10-25 | 鞍钢股份有限公司 | A kind of pre-heating mean avoiding the disconnected band of high grade non-oriented silicon steel cold rolling |
| CN115058573B (en) * | 2022-06-20 | 2024-01-16 | 马鞍山钢铁股份有限公司 | Production method for high-grade non-oriented silicon steel after strip breakage during primary cold rolling |
| CN115161453B (en) * | 2022-07-08 | 2023-11-03 | 江苏沙钢集团有限公司 | Preparation method for preventing cold-rolled high-grade silicon steel from edge damage and edge cracking |
| CN117305717B (en) * | 2023-11-27 | 2024-03-05 | 张家港扬子江冷轧板有限公司 | Preparation method of non-oriented silicon steel |
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| JP5140649B2 (en) * | 2009-09-16 | 2013-02-06 | 日清フーズ株式会社 | Frozen food for microwave cooking |
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| JPH05140649A (en) * | 1991-07-25 | 1993-06-08 | Nippon Steel Corp | Manufacture of now-oriented silicon steel sheet excellent in magnetic property |
| JPH06330174A (en) * | 1993-05-26 | 1994-11-29 | Kawasaki Steel Corp | Production of low iron loss grain oriented silicon steel sheet |
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| CN101343683A (en) * | 2008-09-05 | 2009-01-14 | 首钢总公司 | Method for manufacturing low-iron loss high-magnetic strength non-oriented electrical steel |
| JP5140649B2 (en) * | 2009-09-16 | 2013-02-06 | 日清フーズ株式会社 | Frozen food for microwave cooking |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |