CN105274427A - High-magnetic-induction oriented silicon steel and production method - Google Patents
High-magnetic-induction oriented silicon steel and production method Download PDFInfo
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- CN105274427A CN105274427A CN201510823247.8A CN201510823247A CN105274427A CN 105274427 A CN105274427 A CN 105274427A CN 201510823247 A CN201510823247 A CN 201510823247A CN 105274427 A CN105274427 A CN 105274427A
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Abstract
The invention provides high-magnetic-induction oriented silicon steel. The high-magnetic-induction oriented silicon steel is prepared from, by weight percentage, 0.015%-0.075% of C, 2.80%-3.60% of Si, 0.010%-0.020% of Als, 0.0050%-0.0090% of N, 0.300%-1.00% of Mn, not larger than 0.0150% of S, and the balance one or more of P, Cu, Sb, Sn, Cr and As. A production method includes the production steps that a blank is cast after steel tapping, and the casted blank is heated; hot rolling is conducted; reeling is conducted; normalizing is conducted; the blank is rolled at a time to achieve the thickness of a finished product after acid pickling; decarburization and annealing are conducted; the blank is coated with a high-temperature annealing dusting agent; and high-temperature annealing is conducted. AlN is still used as main inhibitor, but the content of Als and N is controlled, after low-temperature hot rolling and normalizing, one-time cold rolling, decarburization and annealing, coating of a magnesium oxide isolation coating and high-temperature annealing, under the condition that nitriding is not carried out, the magnetic induction intensity B800 of a steel plate is larger than or equal to 1.90 T, and the iron loss P17/50 is smaller than or equal to 1.12 W/kg.
Description
Technical field
The present invention relates to a kind of oriented silicon steel and production method thereof, belong to a kind of high magnetic induction grain-oriented silicon steel and production method particularly.
Background technology
At present, according to the difference of inhibitor system, industrial production high temperature strand heating oriented silicon steel has three kinds of representational technology, all can obtain higher finished product magnetic.But, many problems can be produced at the heat strand of 1400 DEG C, as oxidation sludge increase, scaling loss is large, lumber recovery reduces, repair that stove frequency is high, manufacturing cost increases, surface defects of products is many.Adopt lower slab heating temperature then can effectively avoid these problems, also can reduce the energy consumption cost in production simultaneously.The oriented silicon steel industrial production of current employing low temperature (Heating temperature≤1280 DEG C) heating of plate blank mainly contains: 1) adopt Muscovite (AlN+Cu) the composition system of intrinsic inhibitor and the Cu of Thyssen Krupp
2s system; 2) adopt the later stage to obtain inhibitor with nippon be representative after hot rolling to nitridation process before high temperature annealing; 3) production technique by High Purity unrestraint agent of JFE exploitation.In aforementioned production method, Muscovite (AlN+Cu) is technique, there is the Cu(0.50% that will add volume), and adopt secondary cold-rolling method to produce, cost is high, and surface quality is difficult to control, performance B
8< 1.89T; The technique of Thyssen Krupp then will adopt higher normalizing temperature (>=1100 DEG C); Nippon Steel's technique then will increase nitriding equipment; The unrestraint agent technique of JFE then requires steel high purification (S, N, O, Als etc. are < 30ppm all), adds steel-making cost.
Chinese Patent Application No. is the document of CN201110444436.6, discloses the general oriented silicon steel of a kind of CSP production and manufactures its method.Its component and weight percent are: C:0.015 ~ 0.055%, Si:2.5 ~ 4.0%, Mn:0.10 ~ 0.40%, P≤0.025t%, S≤0.010%, Als:0.010 ~ 0.025%, N:0.0065 ~ 0.0075%, Cu:0.30 ~ 0.60%, all the other are Fe and inevitable impurity; Its step: smelt and adopt CSP; After pickling, first time is cold rolling; Containing moist N
2, H
2middle gross decarburization annealing is carried out under atmosphere; Second time is cold rolling, is rolled to desired thickness; At N
2, H
2carry out recovery annealing, coating magnesium oxide separant under atmosphere, carry out high temperature annealing, carry out smooth stretching, and be coated with layer of cloth.This invention utilizes AlN and ε-Cu as inhibitor, though its rear operation does not need normalizing and nitriding, production cost reduces, and end properties is even, and need adopt secondary cold-rolling, relative lumber recovery is lower, and production cost is high.
Chinese Patent Application No. is the document of CN201110033117.6, disclose a kind of production method of high magnetic induction grain-oriented silicon steel, it comprises the steps: that a) steel-making, continuous casting produce slab, and slab composition by weight percent is: C0.05 ~ 0.10%, Si2.5 ~ 4.0%, S0.008 ~ 0.028%, Als0.008 ~ 0.040%, N0.004 ~ 0.012%, Mn0.08 ~ 0.20%, Cu0.08 ~ 0.30%, all the other are Fe and inevitable impurity; B) above-mentioned slab carrying out hot rolling in process furnace after not higher than the temperature of 1250 DEG C, and finishing temperature is more than 850 DEG C; C) hot-rolled sheet is annealed, pickling, once cold rolling or to comprise twice of process annealing cold rolling, be rolled to finished product thickness; D) carry out decarburizing annealing to cold-reduced sheet, be heated to the soaking temperature of 800 ~ 880 DEG C by cold-reduced sheet, be incubated in wet nitrogen hydrogen protective atmosphere, soaking time is not more than 5 minutes, and after decarburizing annealing, steel plate average crystal grain diameter is 13 ~ 29 μm; E) coating take magnesium oxide as the annealing separating agent of main component, carries out high temperature annealing afterwards; F) final cold rolling after, carry out Nitrizing Treatment before high temperature annealing secondary recrystallization; G) be coated with insulating coating, and carry out stretching and leveling annealing.This document final cold rolling after, carry out Nitrizing Treatment before high temperature annealing secondary recrystallization, add production cost.
Chinese Patent Application No. is the document of CN200810222026.5, discloses a kind of production method of low-temperature heating oriented electrical steel.Strand hot rolling after 1050-1100 DEG C of heating, start rolling temperature is 900-1100 DEG C, and finishing temperature is 850-950 DEG C, rolls into the hot-rolled sheet that 1.5-3.0mm is thick; Carry out high temperature coiling at 650-750 DEG C, batch rear hardening or insulation 10min-2h; Then through once or band process annealing secondary cold-rolling to finished product thickness, its final total reduction is 80-90%; Again through decarburizing annealing, be coated with MgO separant after Nitrizing Treatment and high temperature annealing obtains final finished; Described strand composition is: 0.005-0.08%C, 2.5-6.5%Si, 0.015-0.04%Als, 0.001-0.4%Mn, 0.01-1.0%Cu, S≤0.03%, P≤0.02%, 0.003-0.010%N, and all the other are Fe and inevitable inclusion; Be mass percent.This document must carry out Nitrizing Treatment equally before high temperature annealing secondary recrystallization, added production cost.
Chinese Patent Application No. is the document of CN200410099080.7, disclose a kind of oriented silicon steel and production method thereof and device, its component (weight percent) is: C0.035 ~ 0.060%, Si2.5 ~ 3.5%, Mn0.08 ~ 1.8%, S0.005 ~ 0.010%, Als0.015 ~ 0.035%, N0.0050 ~ 0.0090%, Sn0.01 ~ 0.15%, P0.010 ~ 0.030%, Cu0.05 ~ 0.12%, remaining Fe.Its production method comprises:
A. smelt; B. hot rolling, strand is heated to 1100 ~ 1200 DEG C, and start rolling temperature is less than 1200 DEG C, finishing temperature more than 850 DEG C, coiling temperature less than 650 DEG C; C. normalizing, hot-rolled sheet carries out the normalizing annealing of 1050 ~ 1180 DEG C (1 ~ 20 seconds) and 850 ~ 950 DEG C (30 ~ 200 seconds), and cools fast; D. cold rolling, use once or be with the above cold rolling process of secondary of process annealing to roll finished plate thickness; E. nitriding, decarburization, being coated with MgO is the high temperature annealing separant of main component; High temperature annealing and hot-leveling annealing.The document must carry out Nitrizing Treatment equally.
summary of the invention
The invention reside in solution prior art processes long, production efficiency is low, to the disadvantageous deficiency of reduction production cost, under providing a kind of prerequisite ensureing steel plate time performance, only take once cold rolling method, and without the need to the high magnetic induction grain-oriented silicon steel that carries out Nitrizing Treatment and production method.
Realize the measure of above-mentioned purpose:
A kind of high magnetic induction grain-oriented silicon steel, its component and weight percent content are: C:0.015 ~ 0.075%, Si:2.80 ~ 3.60%, Als:0.010 ~ 0.020%, N:0.0050 ~ 0.0090%, Mn:0.300 ~ 1.00%, S :≤0.0150%, all the other are iron and inevitable impurity; And meet: Mn/S is not less than 50, adds one or more in P, Cu, Sb, Sn, Cr and As, and meets 0.20%≤(P+Cu+Sb+Sn+Cr+As)≤0.60%.
Produce a kind of method of high magnetic induction grain-oriented silicon steel, its step:
1) carry out strand after tapping, and to strand heating, its Heating temperature is at 1100 ~ 1280 DEG C;
2) carry out hot rolling, control finishing temperature at 900 DEG C ~ 1050 DEG C;
3) batch, control coiling temperature and be no more than 600 DEG C;
4) carry out normalizing, normalizing temperature controls at 1050 ~ 1150 DEG C, and is incubated 30 ~ 180s at this temperature;
5) after pickling, carry out disposable cold rolling and be rolling to finished product thickness;
6) carry out decarburizing annealing, control decarburization annealing temperature at 750 ~ 900 DEG C, and be incubated 60 ~ 180s at this temperature, control dew point in stove and be no more than 25 DEG C, in stove, protective atmosphere is wet type H
2with N
2mixed gas, wherein, H
2volume content is 15 ~ 80%;
7) coating take MgO as the high temperature annealing separant of main component;
8) conveniently high temperature annealing is carried out.
The function and mechanism of each element and main technique in the present invention
C, carbon is the important element that oriented silicon steel manufactures, when being less than 0.03%C, particularly be less than the 3.25%Si steel of 0.02%C without phase transformation, strand is the obvious alligatoring of crystal grain when heating, hot-rolled strip is along the deformation coarse grains of central section, thickness of slab direction, <110> fiber texture is strong, remaining tangible metacrystal grain after cold rolling and decarburizing annealing, after high temperature annealing, secondary recrystallization is incomplete, magnetic is reduced, but carbon content is too high, decarburization difficulty can be caused, because in the present invention, another austenite former Mn content is higher, therefore, carbon content is 0.015% ~ 0.075%,
Si, adding Si in oriented electrical steel can increase resistivity, reduce iron loss, but the increase of Si content can cause work brittleness, and therefore, for ensureing that processibility need the content of control Si, Si content is between 2.80% ~ 3.60%;
Mn, S, in the high temperature oriented silicon steel of >=1360 DEG C of heating is produced, Mn, S are favourable precipitation MnS forming element, therefore S >=0.0250%, but the present invention emphasizes≤1280 DEG C of Low Temperature Hot Rollings, and be major inhibitors with AlN, need ensure that MnS separates out with macrobead state, the compound not forming MnS+AlN after normalizing is separated out, therefore Mn/S is needed to be not less than 50, simultaneously Mn content improves and can reduce eddy-current loss, therefore control Mn content at 0.300% ~ 1.00%, S content≤0.0150%;
Als, N be favourable precipitation AlN forming element, but the present invention emphasize≤1280 DEG C of Low Temperature Hot Rollings, content is all unsuitable too high, otherwise causes the solid solubility temperature of AlN higher, thus causes hot rolling Heating temperature higher, therefore Als=0.010% ~ 0.020%, N=0.0050% ~ 0.0090%;
P, Cu, Sb, Sn, Cr and As are supplementary inhibitor forming element, its total content 0.20% ~ 0.60%.
The present invention why by hot rolling heating and temperature control 1100 DEG C≤ST≤1280 DEG C, be because Heating temperature is difficult to solid solution lower than precipitates such as the AlN in slab when 1100 DEG C; Heating temperature can make slab grain coarsening higher than 1280 DEG C, and scaling loss is serious, and energy consumption increases, and the lumber recovery of product reduces.
The present invention why by finishing temperature control within the scope of 900 DEG C ~ 1050 DEG C, to make not separate out the Second Phase Particles such as oarse-grained AlN in the hot rolling.
Why normalizing temperature controls at 1050 DEG C ~ 1150 DEG C by the present invention, and is incubated 30 ~ 180s, and to ensure size, suitable AlN Second Phase Particles completes precipitation, suppresses during annealing to grain growth.At lower than the temperature of 1050 DEG C, carry out normalizing, because temperature is low, AlN is difficult to solid solution; Higher than 1150 DEG C of steel band grain coarsenings, grain growth after causing primary recrystallization to be annealed, increases cost simultaneously.
Why decarburization annealing temperature controls at 750 ~ 900 DEG C by the present invention, and is incubated 60 ~ 180s, and makes dew point be no more than 25 DEG C, and adopts protective atmosphere to be wet H
2and N
2mixed gas, be carbon in steel to take off a certain amount of below, be in single α phase during high temperature annealing after ensureing, develop perfect secondary recrystallization tissue.
The present invention is still major inhibitors with AlN, but Als content is controlled 0.010% ~ 0.020%, N content controls 0.0050% ~ 0.0090%, Mn content controls 0.300% ~ 1.00%, S content controls≤0.0150%, slab hot rolling Heating temperature is reduced by the solubility product reducing Als and N, again by Low Temperature Hot Rolling (≤1280 DEG C) and hot-rolled sheet 1050 DEG C ~ 1150 DEG C normalizing process, through once cold rolling, decarburizing annealing, after being coated with magnesium oxide barrier coat and high temperature annealing, not nitriding obtains finished steel plate (0.30mm thickness) magnetic induction density B 800 >=1.90T, iron loss P17/50≤1.12W/kg.
Embodiment
Below the present invention is described in detail:
Table 1 is the component value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters value list of various embodiments of the present invention and comparative example;
Table 3 is the Performance Detection situation list of various embodiments of the present invention and comparative example.
Various embodiments of the present invention are all produced according to following steps:
1) carry out strand after tapping, and to strand heating, its Heating temperature is at 1100 ~ 1280 DEG C;
2) carry out hot rolling, control finishing temperature at 900 DEG C ~ 1050 DEG C;
3) batch, control coiling temperature and be no more than 600 DEG C;
4) carry out normalizing, normalizing temperature controls at 1050 ~ 1150 DEG C, and is incubated 30 ~ 180s at this temperature;
5) after pickling, disposable cold rolling is carried out to finished product thickness;
6) carry out decarburizing annealing, control decarburization annealing temperature at 750 ~ 900 DEG C, and be incubated 60 ~ 180s at this temperature, control dew point in stove and be no more than 25 DEG C, in stove, protective atmosphere is wet type H
2with N
2mixed gas, wherein, H
2volume content is 15 ~ 80%;
7) coating take MgO as the high temperature annealing separant of main component;
8) conveniently high temperature annealing is carried out.
Illustrate: the value in a following table 1 and table 2 is not corresponding relation
The value list (wt%) of table 1 various embodiments of the present invention and comparative example
The main technologic parameters list of table 2 various embodiments of the present invention and comparative example
Table 3 various embodiments of the present invention and the list of comparative example Performance Detection situation
Can analyze from table 3, because in comparative example 1, Als < 0.010%, Als content is on the low side, effective AlN separates out quantity and reduces, and the quantity of favourable precipitation reduces, and in rear operation annealing, restraint reduces, and finished product magnetic property reduces; Due to Als > 0.020% in comparative example 2, the solubility product of Als and N is higher, under≤1280 DEG C of heating states, be difficult to complete solid solution, causes effectively separating out quantity and reduces, thus restraint reduces in causing rear operation to be annealed, finished product magnetic property reduces; Due to Mn < 0.300% in comparative example 8, in hot rolling, MnS particle will be separated out, after normalizing, the compound forming MnS+AlN be separated out; the size of precipitated phase is caused to become large; effective precipitation quantity reduces, thus in causing rear operation to be annealed, restraint reduces, and finished product magnetic property reduces.
Again due to hot rolling Heating temperature < in comparative example 1 1100 DEG C, finishing temperature < 900 DEG C, in heat-processed, AlN substantially can not solid solution completely, and finishing temperature is on the low side, will separate out oarse-grained AlN, effective AlN separates out and reduces, normalizing time < 30s, AlN separate out deficiency of time, effectively separate out quantity and reduce, thus restraint reduces in causing rear operation to be annealed, finished product magnetic property worsens, hot rolling Heating temperature > 1280 DEG C in comparative example 2, Heating temperature is higher, casting blank crystal grains Size growth, thus cause hot-rolled sheet, primary recrystallization annealed sheet grain-size is grown up, simultaneously, Heating temperature is higher, strand scaling loss will be aggravated, lumber recovery reduces, finishing temperature < 900 DEG C, oarse-grained AlN will be separated out, effective AlN separates out and reduces, normalizing time > 180s, the normalizing time is oversize will cause favourable precipitation to be assembled, alligatoring, thus restraint reduces in causing rear operation to be annealed, simultaneously, Heating temperature is oversize, casting blank crystal grains Size growth, thus cause hot-rolled sheet, primary recrystallization annealed sheet grain-size is grown up, finished product magnetic property reduces, finishing temperature < 900 DEG C in comparative example 8, oarse-grained AlN will be separated out, effective AlN separates out and reduces, thus restraint reduces in causing rear operation to be annealed, normalizing temperature < 1050 DEG C, the AlN of normalizing small particles is difficult to solid solution, the AlN that size is suitable is difficult to separate out, effective AlN separates out quantity and reduces, thus in causing rear operation to be annealed, restraint reduces, and finished product magnetic property reduces.Two the present invention are just because of controlling at limited composition and content, and in processing range, therefore magnetic property is more excellent than comparative example.
This embodiment is only the best and exemplifies, the restricted enforcement not to technical solution of the present invention.
Claims (2)
1. a high magnetic induction grain-oriented silicon steel, its component and weight percent content are: C:0.015 ~ 0.075%, Si:2.80 ~ 3.60%, Als:0.010 ~ 0.020%, N:0.0050 ~ 0.0090%, Mn:0.300 ~ 1.00%, S :≤0.0150%, all the other are iron and inevitable impurity; And meet: Mn/S is not less than 50, adds one or more in P, Cu, Sb, Sn, Cr and As, and meets 0.20%≤(P+Cu+Sb+Sn+Cr+As)≤0.60%.
2. the method for a kind of high magnetic induction grain-oriented silicon steel described in production claim 1, its step:
1) carry out strand after tapping, and to strand heating, its Heating temperature is at 1100 ~ 1280 DEG C;
2) carry out hot rolling, control finishing temperature at 900 DEG C ~ 1050 DEG C;
3) batch, control coiling temperature and be no more than 600 DEG C;
4) carry out normalizing, normalizing temperature controls at 1050 ~ 1150 DEG C, and is incubated 30 ~ 180s at this temperature;
5) after pickling, disposable cold rolling is carried out to finished product thickness;
6) carry out decarburizing annealing, control decarburization annealing temperature at 750 ~ 900 DEG C, and be incubated 60 ~ 180s at this temperature, control dew point in stove and be no more than 25 DEG C, in stove, protective atmosphere is wet type H
2with N
2mixed gas, wherein, H
2volume content is 15 ~ 80%;
7) coating take MgO as the high temperature annealing separant of main component;
8) conveniently high temperature annealing is carried out.
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| CN108018489A (en) * | 2017-12-15 | 2018-05-11 | 武汉钢铁有限公司 | A kind of economical high magnetic induction grain-oriented silicon steel and production method |
| JP2019116680A (en) * | 2017-12-26 | 2019-07-18 | ポスコＰｏｓｃｏ | Slab for grain-oriented electrical steel sheet, grain-oriented electrical steel sheet and manufacturing method thereof |
| CN110846576A (en) * | 2019-11-18 | 2020-02-28 | 武汉钢铁有限公司 | Oriented silicon steel with self-bonding performance and preparation method thereof |
| CN111334653A (en) * | 2020-03-26 | 2020-06-26 | 武汉钢铁有限公司 | High magnetic induction oriented silicon steel and preparation method thereof |
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| CN113166892A (en) * | 2018-11-30 | 2021-07-23 | Posco公司 | Oriented electrical steel sheet and method for manufacturing the same |
| CN114107809A (en) * | 2021-11-12 | 2022-03-01 | 内蒙古科技大学 | Oriented electrical steel with copper precipitation as single inhibitor and production method thereof |
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| CN114107809A (en) * | 2021-11-12 | 2022-03-01 | 内蒙古科技大学 | Oriented electrical steel with copper precipitation as single inhibitor and production method thereof |
| CN115433876A (en) * | 2022-09-20 | 2022-12-06 | 武汉钢铁有限公司 | Oriented silicon steel produced based on continuous casting and rolling of thin slab and method |
| CN115449741A (en) * | 2022-09-20 | 2022-12-09 | 武汉钢铁有限公司 | High-magnetic-induction oriented silicon steel produced based on continuous casting and rolling of thin slab and method |
| CN115449741B (en) * | 2022-09-20 | 2023-11-24 | 武汉钢铁有限公司 | High-magnetic induction oriented silicon steel produced based on sheet billet continuous casting and rolling and method |
| CN115433876B (en) * | 2022-09-20 | 2024-03-26 | 武汉钢铁有限公司 | Oriented silicon steel produced based on sheet billet continuous casting and rolling and method |
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