CN107630133B - A kind of production method of the excellent high grade electrical steel product of frequency property - Google Patents
A kind of production method of the excellent high grade electrical steel product of frequency property Download PDFInfo
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- CN107630133B CN107630133B CN201610562806.9A CN201610562806A CN107630133B CN 107630133 B CN107630133 B CN 107630133B CN 201610562806 A CN201610562806 A CN 201610562806A CN 107630133 B CN107630133 B CN 107630133B
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Abstract
The present invention relates to a kind of production methods of the excellent high grade electrical steel product of frequency property, comprising: 1) nitriding temperature is 750~1000 DEG C in first segment soaking pit；Under original atmosphere state, it is passed through 5%~50% pure ammonia, nitriding time is controlled in 5~200s；It 2) is guidance with nitrogen content detection data in furnace according to finished product thickness specification, controlling high grade electric steel surface nitrogen content is 30~1000ppm；3) it is transferred to second segment soaking pit and carries out subsequent production.The present invention adjusts finished product heat treatment process by increasing surface carburization process, realizes the gradient distribution of product tissue, so that it had not only been adapted to the tissue need in low-frequency magnetic section, but also adapt to the surface layer fine tissue demand of electronic curing；It is avoided to realize end properties and uses more high alloy content and the drawbacks of more thin gauge method causes production difficulty to increase.
Description
Technical field
The present invention relates to the excellent high grade electric steel productions of technical field of electrical sheet production more particularly to a kind of frequency property
The production method of product.
Background technique
Cold rolling electric is widely applied metal function soft magnetic materials, is mainly used in the iron of all kinds of motors and electric appliance
Core manufacturing field.With the technological progress of downstream industry, the extensive use of converter technique, high frequency frequency-variable efficient motor is increasingly becoming
Main product proposes requirements at the higher level to efficient electrical sheet electromagnetic performance: it on the one hand being required to reach normal in low frequency operation section
It is horizontal to advise electromagnetic performance, it is on the other hand required to have high-frequency low-consumption characteristic in medium-high frequency operation interval, and to realize this two
The production tool that the conflicting performance of kind results in such electrical steel product acquires a certain degree of difficulty.
In conventional high grade electric steel production, smelting process priority control steel cleanliness index reduces to greatest extent
The harmful elements such as sulphur, nitrogen, titanium, avoid the formation of second phase particles, influence later period advantageous microstructure texture component and generate；Finished product heat treatment
Process generallys use the continuous annealing furnace technology of two-part soaking, hankers for one section controlling decarburization and recrystallization process, two sections of height
Warm thermal control crystal grain is grown up, and magnetic hystersis loss is mitigated.In addition, without nitriding process in conventional high grade electric steel production.
The electrical steel product of frequency conversion field application just gradually develops to high-grade, low iron loss, the high trade mark, or to thin gauge
Product development need to obtain relatively tiny finished product tissue, therefore high grade electric steel produces to reduce the eddy-current loss being increased sharply
Product also need the distribution of coarse tissue and fine tissue in control finished product when producing.
Summary of the invention
The present invention provides a kind of production methods of the excellent high grade electrical steel product of frequency property, by increasing surface
Nitriding process, and finished product heat treatment process is adjusted, it realizes the gradient distribution of product tissue, it is made both to have adapted to low-frequency magnetic section
Tissue need, and adapt to the surface layer fine tissue demand of electronic curing；It is avoided to realize end properties and use is higher
Alloy content and the drawbacks of more thin gauge method causes production difficulty to increase.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of production method of the excellent high grade electrical steel product of frequency property, the change of the high grade electrical steel product
It studies and is grouped into: C≤0.003%, Si 3.0%~4.0%, Al 0.5%~1.0%, Mn 0.10%~0.30%, P≤
0.012%, S≤0.0015%, N≤0.0020%, remaining is Fe and other inevitable residual elements；Finished product heat treatment is adopted
With the continuous annealing furnace annealing of two-part soaking；Include:
1) increase nitridation process process in surface layer in first segment soaking pit, nitriding temperature is 750~1000 DEG C, guarantees nitriding
Heat power；Under original atmosphere state, it is passed through 5%~50% pure ammonia, by decomposing the activated nitrogen atom and height that ammonia generates
The reaction of grade electric steel surface；Nitriding time is controlled in 5~200s；
2) according to finished product thickness specification, it is guidance with nitrogen content detection data in furnace, controls high grade electric steel surface nitrogen
Content is 30~1000ppm；
3) being transferred to second segment soaking pit progress subsequent production makes high grade electric steel because of the inhibiting effect of surface layer nitride
Obtain the Tissue distribution form that vertical section surface layer is relatively tiny, center portion is relatively coarse.
Compared with prior art, the beneficial effects of the present invention are:
1) it by adjusting finished product heat treatment process, realizes the gradient distribution of product tissue, it is made both to adapt to low-frequency magnetic
The tissue need in section, and adapt to the surface layer fine tissue demand of electronic curing；
2) frequently with high frequency high resistivity high alloy steel grade or more thin gauge to realize end properties, but its in routinely producing
The low technological difficulties of bring cold rolling recovery rate are difficult to overcome；The present invention can be used without high alloy steel grade compared with think gauge
Product realizes end properties, meets application requirement；Its production difficulty substantially reduces, and can reduce production cost.
Specific embodiment
A kind of production method of the excellent high grade electrical steel product of frequency property of the present invention, the high trade mark electrician
The chemical component of steel product forms are as follows: and C≤0.003%, Si 3.0%~4.0%, Al 0.5%~1.0%, Mn 0.10%~
0.30%, P≤0.012%, S≤0.0015%, N≤0.0020%, remaining is Fe and other inevitable residual elements；At
Product heat treatment uses the continuous annealing furnace annealing of two-part soaking；Finished product heat treatment is moved back using the continuous annealing furnace of two-part soaking
Fire；Include:
1) increase nitridation process process in surface layer in first segment soaking pit, nitriding temperature is 750~1000 DEG C, guarantees nitriding
Heat power；Under original atmosphere state, it is passed through 5%~50% pure ammonia, by decomposing the activated nitrogen atom and height that ammonia generates
The reaction of grade electric steel surface；Nitriding time is controlled in 5~200s；
2) according to finished product thickness specification, it is guidance with nitrogen content detection data in furnace, controls high grade electric steel surface nitrogen
Content is 30~1000ppm；
3) being transferred to second segment soaking pit progress subsequent production makes high grade electric steel because of the inhibiting effect of surface layer nitride
Obtain the Tissue distribution form that vertical section surface layer is relatively tiny, center portion is relatively coarse.
Following embodiment is implemented under the premise of the technical scheme of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
Not mentionleting alone bright is conventional method.
[embodiment 1]
Main chemical compositions are as follows: C:0.0029%, Si:3.11%, Al:0.53%, Mn:0.13%, P:0.010%, S:
0.0014%, N:0.0018% control the first soaking zone nitriding temperature at 910 DEG C in two-period form continuous annealing furnace；Atmosphere is whole
Body control is N2(60%)+H2(25%)+NH3(15%)；The annealing furnace unit speed of service and bringing-up section furnace superintendent are adjusted, control is seeped
Nitrogen handles time 25s, and detecting control nitrogen content by nitrogen oxygen instrument is 95ppm；Second segment soaking pit controls 1060 DEG C of heating temperature；
Final finished surface layer (the 10% of cross dimensions) crystallite dimension is 80 μm, and core structure is 185 μm.
Product conventional electromagnetic performance P1.5/50 is 2.32W/kg, under product 400Hz magnetization, P1.0/400 15.12W/
kg。
[embodiment 2]
Main chemical compositions are as follows: C:0.0027%, Si:3.21%, Al:0.83%, Mn:0.15%, P:0.008%, S:
0.0013%, N:0.0019% control the first soaking zone nitriding temperature at 860 DEG C in two-period form continuous annealing furnace；Atmosphere is whole
Body control is N2(58%)+H2(24%)+NH3(18%)；The annealing furnace unit speed of service and bringing-up section furnace superintendent are adjusted, control is seeped
Nitrogen handles time 29s, and detecting control nitrogen content by nitrogen oxygen instrument is 105ppm；Second segment soaking pit controls heating temperature 1060
℃；Final finished surface layer (the 10% of cross dimensions) crystallite dimension is 82 μm, and core structure is 183 μm.
Product conventional electromagnetic performance P1.5/50 is 2.25W/kg, under product 400Hz magnetization, P1.0/400 14.72W/
kg。
[embodiment 3]
Main chemical compositions are as follows: C:0.0025%, Si:3.32%, Al:0.65%, Mn:0.19%, P:0.010%, S:
0.0014%, N:0.0019% control the first soaking zone nitriding temperature at 880 DEG C in two-period form continuous annealing furnace；Atmosphere is whole
Body control is N2(57%)+H2(23%)+NH3(20%)；The annealing furnace unit speed of service and bringing-up section furnace superintendent are adjusted, control is seeped
Nitrogen handles time 26s, and detecting control nitrogen content by nitrogen oxygen instrument is 102ppm；Second segment soaking pit controls heating temperature 1060
℃；Final finished surface layer (the 10% of cross dimensions) crystallite dimension is 85 μm, and core structure is 186 μm.
Product conventional electromagnetic performance P1.5/50 is 2.19W/kg, under product 400Hz magnetization, P1.0/400 13.93W/
kg。
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (1)
1. a kind of production method of the excellent high grade electrical steel product of frequency property, the chemistry of the high grade electrical steel product
At being grouped as are as follows: C≤0.003%, Si 3.0%~4.0%, Al 0.5%~1.0%, Mn 0.10%~0.30%, P≤
0.012%, S≤0.0015%, N≤0.0020%, remaining is Fe and other inevitable residual elements；Finished product heat treatment is adopted
With the continuous annealing furnace annealing of two-part soaking；It is characterised by comprising:
1) increase nitridation process process in surface layer in first segment soaking pit, nitriding temperature is 750~1000 DEG C, guarantees that nitriding heat is dynamic
Power；Under original atmosphere state, it is passed through 5%~50% pure ammonia, by decomposing the activated nitrogen atom and the high trade mark that ammonia generates
The reaction of electrician's steel surface；Nitriding time is controlled in 5~200s；
2) according to finished product thickness specification, it is guidance with nitrogen content detection data in furnace, controls high grade electric steel surface nitrogen content
For 30~1000ppm；
3) it is transferred to second segment soaking pit and carries out subsequent production, because of the inhibiting effect of surface layer nitride, obtain high grade electric steel
The Tissue distribution form that vertical section surface layer is relatively tiny, center portion is relatively coarse；
Product conventional electromagnetic performance P1.5/50 is 2.32W/kg, 2.25W/kg or 2.19W/kg.
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| CN201610562806.9A CN107630133B (en) | 2016-07-18 | 2016-07-18 | A kind of production method of the excellent high grade electrical steel product of frequency property |
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| CN107630133B true CN107630133B (en) | 2019-06-28 |
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| CN101358273A (en) * | 2008-09-05 | 2009-02-04 | 首钢总公司 | Method for producing low-temperature oriented electrical steels |
| CN101876028A (en) * | 2009-12-22 | 2010-11-03 | 武汉钢铁(集团)公司 | Non-oriented electrical steel for variable frequency motor and production method thereof |
| CN103074476A (en) * | 2012-12-07 | 2013-05-01 | 武汉钢铁(集团)公司 | Method for producing high-magnetic-induction oriented silicon strips through three-stage normalizing |
| CN103540846A (en) * | 2013-08-27 | 2014-01-29 | 国家电网公司 | Thin-gauge, ultra-low iron loss, low-noise and high-magnetic induction oriented silicon steel sheet and production method thereof |
| CN105256226A (en) * | 2015-11-20 | 2016-01-20 | 武汉钢铁(集团)公司 | Cold-rolled non-oriented silicon steel low in iron loss and production method |
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- 2016-07-18 CN CN201610562806.9A patent/CN107630133B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1481444A (en) * | 2000-12-18 | 2004-03-10 | ��ɭ��²����ǡ��˹��ǡ���ض������� | Process for prodn. of grain oriented electrical steel strips |
| CN101358273A (en) * | 2008-09-05 | 2009-02-04 | 首钢总公司 | Method for producing low-temperature oriented electrical steels |
| CN101876028A (en) * | 2009-12-22 | 2010-11-03 | 武汉钢铁(集团)公司 | Non-oriented electrical steel for variable frequency motor and production method thereof |
| CN103074476A (en) * | 2012-12-07 | 2013-05-01 | 武汉钢铁(集团)公司 | Method for producing high-magnetic-induction oriented silicon strips through three-stage normalizing |
| CN103540846A (en) * | 2013-08-27 | 2014-01-29 | 国家电网公司 | Thin-gauge, ultra-low iron loss, low-noise and high-magnetic induction oriented silicon steel sheet and production method thereof |
| CN105256226A (en) * | 2015-11-20 | 2016-01-20 | 武汉钢铁(集团)公司 | Cold-rolled non-oriented silicon steel low in iron loss and production method |
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