CN1978691A - Oriented silicon steel based on thin slab continuous casting and rolling and its manufacturing method - Google Patents
Oriented silicon steel based on thin slab continuous casting and rolling and its manufacturing method Download PDFInfo
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- CN1978691A CN1978691A CN 200510111006 CN200510111006A CN1978691A CN 1978691 A CN1978691 A CN 1978691A CN 200510111006 CN200510111006 CN 200510111006 CN 200510111006 A CN200510111006 A CN 200510111006A CN 1978691 A CN1978691 A CN 1978691A
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Abstract
The invention relates to orientation silicon steel based on slab billet continuous casting tandem rolling. Its components are not more than 0.005wt% C, 2.9-3.5wt% Si, 0.045-0.075wt% Mn, 0.015-0.025wt% S, not more 0.030wt% P and 0.006wt% Alsol, 0.0015-0.0055wt% N, 0.12-0.20wt% Cu, not more than 0.005wt% Ti, rest unavoidable impurity and Fe. The method includes the following steps: using general technology to form slab billet; hot rolling; cold rolling; inter-annealing; high annealing. It uses process annealing before high annealing to substitute decarburizing annealing in existing technology to increase inter-annealing speed, further improve production efficiency and reduce cost.
Description
Technical field
The present invention relates to a kind of oriented silicon steel, particularly a kind of oriented silicon steel and manufacture method thereof based on CSP.
Background technology
Traditional oriented silicon steel production method is as follows: with converter (or electric furnace) steel-making, carry out secondary refining and alloying, continuous casting becomes slab, its basic chemical ingredients is Si2.5～4.5%, C0.01～0.10%, Mn0.03～0.1%, S0.012～0.050%, Als0.01～0.05%, N0.003～0.012%, the composition system that has also contains one or more in the elements such as Cu, Mo, Sb, Cr, B, Bi, and all the other are iron and unavoidable impurities element; The temperature of slab about special-purpose high temperature process furnace internal heating to 1400 ℃, and carry out insulation more than 30 minutes, make the abundant solid solution of favourable inclusion, so that in course of hot rolling subsequently, in the silicon steel matrix, separate out second phase particle, the i.e. inhibitor tiny, disperse; After the hot-rolled sheet normalizing (or not normalizing), carry out pickling, remove scale on surface; With once cold rolling or comprise that twice above cold-rolling practice of process annealing roll finished product thickness, carry out decarburizing annealing and coating is the annealing separating agent of main component with MgO, the carbon in the steel plate is taken off the degree that do not influence finished product magnetic (generally should below 50ppm); In the high-temperature annealing process, steel plate generation secondary recrystallization, Mg
2SiO
4Bottom forms and purifies physicochemical change such as (remove in the steel S, N etc. to the deleterious element of magnetic), obtains orientation degree height, oriented silicon steel that iron loss is low; At last, through the coating insulating coating and the annealing that stretches, obtain the oriented silicon steel of commercial applications form.Traditional oriented silicon steel production is to be that 210mm～250mm, continuous casting pulling rate are to produce under the condition of 0.8～1.5m/min at slab thickness.
Above-mentioned traditional oriented silicon steel production technology is passed through the development of over half a century, and is very ripe, produced top oriented silicon steel.But, because there be (radius reaches 1～20 μ m) in MnS, AlN in the strand with thickization form, need be with 1360～1420 ℃ high temperature, carry out the reheat of slab for a long time.Scaling loss is big in the process furnace, up to about 3%.So the cycle of process furnace blowing out scarfing cinder is very short, even adopt the technology of liquid slagging-off, needs blowing out once in every month.The probability of waist, disconnected base of collapsing in the process furnace is very big.Because rolling temperature is very high, it is very high to add silicone content, the processing characteristics rapid deterioration.Band, logical plate difficulty are worn in finish rolling, and the probability that defectives such as broken belt, limit split, limit damage occur is very high, and the limit is split and can be arrived more than the 20mm, and lumber recovery is low, the cost height.
In order to address these problems, in long-term production practice and research work, people have groped and have developed some successful ways, and one of them is that the method that adopts sheet blank continuous casting to produce oriented silicon steel is produced oriented silicon steel.Typically, such technology is disclosed in the denomination of invention announced by Nippon Steel Manufacturing Corp application and on July 31st, 2002 and opens among the 2002-212639 for the spy of " the oriented silicon steel board fabrication method that has excellent magnetic characteristics ", the chemical ingredients of this invention (weight percent) is: C0.025%～0.10%, Si2.5%～4.0%, one or both of S or Se, (this equation is the equivalent formula of S content with Seq=S+0.406Se, Seq is the S equivalent, the effect and the S that are Se are suitable, can form the MnSe inhibitor) count 0.003%～0.030%, Als0.002%～0.010%, N0.0010%～0.0050%, Mn0.02～0.20%, Cu0.01%～0.30%, P, Sn, at least a kind content is 0.02～0.30% among the Sb, Cr0.02%～0.30%, Ni0.03%～0.30%, Mo, at least a kind content is 0.008%～0.30% among the Cd, and all the other are Fe and inevitable inclusion.Form the thick slab of 30～140mm with the sheet blank continuous casting method, after the heating of carrying out under 1000 ℃～1250 ℃ more than 5 minutes, carry out hot rolling.Steel band carries out the normalizing of 950～1150 ℃ * 30～600sec. to be handled, with 1 time cold rolling or have twice above cold rolling process of process annealing to be rolled down to final product thickness, finally the cold rolling draft of rolling process is 0～85%, steel plate is at the N of traveling process after the decarburizing annealing
2, H
2, NH
3Carry out nitriding in the mixed atmosphere, the N amount of increasing of steel band is 0.001%～0.010%, carries out high temperature annealing behind the separant coating, produces the oriented silicon steel of excellent magnetic.
The embodiment of the thin slab orientation silicon steel production technology of announcing from above-mentioned patent (spy opens 2002-212639), this patented technology is to be the chemical ingredients system of main inhibitor with carbon, nitride, Al
Sol.And S content is all lower, and carbon content is higher; On the technology, because carbon content is higher in the composition, all necessary decarburization of the decarburizing annealing after the process annealing and the second time are cold rolling, thus make production efficiency lower.Simultaneously, this patent adopts logical NH in decarburizing annealing
3The inhibition ability is strengthened in nitriding, but because Al
Sol.And S content is all lower, AlN, (Mn, Cu)
xThe content of stable inhibitor such as S is very low, can influence the stability of quality product.
Summary of the invention
The purpose of this invention is to provide a kind of low cost, high efficiency oriented silicon steel and manufacture method thereof based on CSP, can adopt low-carbon (LC), low aluminum chemistry composition, need not to carry out decarburization in the recrystallization annealing after the process annealing and the second time are cold rolling, plate speed is increased, and the glassy membrane bottom is superior in quality.
For achieving the above object, the invention provides a kind of oriented silicon steel based on CSP, its composition is (weight percent):
C：≤0.005
Si：2.9～3.5
Mn：0.045～0.075
S：0.015～0.025
P：≤0.030
Al
sol.≤0.006
N：N0.0015～0.0055
Cu：0.12～0.20
Ti：≤0.005
All the other are unavoidable impurities and Fe.
Below be the effect and the qualification explanation thereof of patent principal element of the present invention:
A) carbon
Carbon is to enlarge γ phase block elements, and it mainly acts on is in course of hot rolling, makes to contain a certain amount of γ phase in the steel, by γ α phase transformation thinning microstructure, and makes it to present the specific gradient of organizing along the thickness of slab direction, and promptly plate center grain structure is tiny; Plate near surface crystal grain is thick, is easy to make secondary recrystallization perfect.Adopt sheet blank continuous casting technology and since in the strand column crystal less, form organize crystal grain thinner, eliminated the disadvantageous effect of conventional continuously cast bloom columanar structure prosperity to secondary recrystallization stability, C content can significantly reduce.But C content is low excessively, smelts control and becomes difficult, therefore sets C≤0.005 (weight percent).Preferably, set C≤0.003 (weight percent), can fully eliminate magnetic aging appears in the finished product, the possibility of magnetic property when influencing life-time service.
B) silicon
Content is at 2.9～3.5 (weight percents), and silicon significantly improves resistivity, reduces eddy-current loss, reduces iron loss.If but the Si too high levels, materials processing difficulty, hot-rolled sheet are organized thick, make that the inhibitor of separating out is thick, quantity reduces, restraint reduces, the secondary recrystallization difficulty.Preferably, set Si content between 3.05～3.35 (weight percents), can reduce iron loss, guarantee manufacturability simultaneously.
C) manganese
Main effect be form MnS or (Mn, Cu)
xS inhibitor and prevent that hot-rolled sheet is hot-short.Mn content is low excessively, and the MnS particle that forms in the course of hot rolling is very few, and restraint is low, and secondary recrystallization is incomplete; The Mn too high levels, [%Mn] * [%S] is long-pending high (according to thermodynamic (al) ultimate principle, between the solid solubility temperature of product [%Mn] * [%S] of Mn, S content and precipitated phase MnS following relation: log[%Mn is arranged in the steel] * [%S]=-a/T+b, a, b are constant, as a=9800, b=3.74, i.e. [%Mn] * [%S] is high more, the solid solubility temperature that requires is also high more), the MnS particle is too thick in the strand, and slab heating temperature improves, and the material scaling loss is serious, recovery rate reduces, content is at 0.045～0.075 (weight percent), can form q.s (Mn, Cu)
xThe S precipitated phase.Preferably, the content of setting Mn can obtain more stable magnetic property between 0.050～0.065 (weight percent).
D) sulphur
Content is at 0.015～0.025 (weight percent), sulphur mainly with Mn, Cu form (Mn, Cu)
xS.S content is low excessively, form (Mn, Cu)
xThe S quantity not sufficient, restraint is low; The S too high levels, finished product desulfurization difficulty.Preferably, the content of setting S can obtain more stable magnetic property between 0.018～0.025 (weight percent).
E) phosphorus
Phosphorus content is controlled at≤0.030 (weight percent).Preferably, P≤0.015 (weight percent) is more evenly distributed the precipitated phase in the hot-rolled sheet, magnetic optimization.
F) sour molten aluminium and nitrogen
Molten aluminium [the Al of acid
Sol.] and nitrogen [N]: in steel, contain an amount of Al
Sol.Very necessary with N to stabilized magnetic, i.e. [%Al
Sol.]=0.001～0.006, [%N]=0.0015～0.0055 o'clock, slab heating temperature reduces, magnetic stability.Preferably, set Al
Sol.≤ 0.0045 and N content between 0.0015～0.0040, form perfect secondary recrystallization, and the subgrain size reduces, iron loss reduces.
G) copper
Content is at 0.12～0.20 (weight percent), and adding Cu can increase the γ phase content, can suitably reduce C content; Add Cu can separate out (Cu, Mn)
xS or Cu
xThe S particle, (Cu, Mn)
xS or Cu
xS separate out temperature than MnS low 80 ℃～100 ℃, reduce slab heating temperature, and separate out (Cu, Mn)
xS or Cu
xS is than more also significantly increase of small and dispersed, the amount of separating out of MnS, so restraint strengthens raising secondary cold-rolling draft and finished product magnetic.Add Cu can improve after the annealing of hot-rolled sheet and primary recrystallization 110}＜001〉position is to crystal grain (being needed goss texture), reduce 100}＜001〉position is to crystal grain (being to the deleterious texture of secondary recrystallization takes place), promotes secondary recrystallization.But Cu content in 0.20% easily just precipitated phase alligatoring when above, influence the inhibition ability.Therefore, among the present invention Cu content is controlled between 0.12～0.20 (weight percent).Preferably, set Cu content between 0.15～0.19, precipitated phase small and dispersed, the amount of separating out increase.
H) titanium
Ti belongs to the crystal grain thinning element, owing to can form stable carbon, nitride, be difficult to remove in the step process of back and influence the magnetic property of finished product, so its content should be limited in below 0.005%, and the preferable range of Ti is Ti≤0.003 (weight percent).
For achieving the above object, the present invention also provides a kind of manufacture method of the oriented silicon steel based on CSP, it comprises and utilizes routine techniques to form thin slab, step through hot rolling, cold rolling, process annealing, high temperature annealing, mainly be to replace decarburizing annealing of the prior art, thereby improved production efficiency and reduce cost with the recrystallization annealing before the high temperature annealing.
The basic production technology of the inventive method is as follows:
1) smelting and casting
With converter or Electric furnace steel making, molten steel obtains strand behind secondary refining and sheet blank continuous casting, is that to form thickness be the slab of 50～60mm for the casting process of 3～6m/min through pulling rate.Select suitable casting parameters, make equiaxed zone ratio 〉=60%, particle diameter is about 50% at the precipitated phase ratio of 30～50nm in the strand.
2) hot rolling
Strand is soaking 20～30min. in temperature is 1150～1250 ℃ of roller hearth furnaces, 1050～1150 ℃ of open rollings, and the temperature finish to gauge more than 850 ℃ rolls into the hot-rolled sheet of 1.5～3.0mm thickness, and coiling temperature is below 650 ℃.
3) cold rolling
Hot-rolled sheet can carry out normalizing to be handled, and also can not carry out normalizing and direct cold rolling.The above cold-rolling practice of secondary with band process annealing is rolled production board thickness, and final draft is 50～70%.
4) process annealing
Speed with 10～20 ℃/sec. heats up, and 800～1000 ℃ * 30～100sec., 75%H
2+ 25%N
2, D.P.＜0 ℃ is with the speed cooling greater than 5 ℃/sec..
5) recrystallization annealing
The steel plate that rolls finished product thickness is carried out recrystallization annealing, and coating is the high temperature annealing separant of main component with MgO.At 75%H
2+ 25%N
2Atmosphere in heat up with the speed of 20～25 ℃/sec., 800～850 ℃ * 30～80sec., after the annealing grain-size is controlled at below the 16 μ m; Regulate the pH in the atmosphere
2O/pH
2Value, the oxygen level that makes annealing back steel band is between 400～800ppm, after this at 100%N
2Middle cooling.
Annealing temperature is below 800 ℃ and annealing time when being less than 30sec., and steel plate recrystallization is insufficient, influences dimensional precision and glassy membrane quality; Annealing temperature is when reaching annealing time greater than 80sec. more than 850 ℃, and recrystallization crystal particle dimension increases, influences magnetic, reduces production efficiency.The oxygen level of steel band has substantial connection after the quality of glassy membrane and the recrystallization annealing, when oxygen level is lower than 400ppm, because SiO in the steel band
2Content is low, and the glassy membrane of formation approaches and the subregion can not form; When oxygen level was higher than 800ppm, glassy membrane thickeies but tack is bad, and regional area comes off and reveals crystalline substance, forms bright spot.
6) high temperature annealing and hot-leveling annealing
High temperature annealing routinely and hot-leveling technology are carried out.
Method of the present invention is because slab is thin, speed of cooling is high, pulling rate is fast, MnS, Cu in the strand, Mn)
xPrecipitate such as S, AlN exists with fine particle (mean diameter is less than 80nm) form, can make the reheat temperature of slab reduce to below 1250 ℃, can not produce liquid slag (1270 ℃ time oxide on surface fusing).Compare with conventional production process, not only steel billet can reduce by 2% scaling loss amount, and does not need the blowing out scarfing cinder.(conventional production adopted walking beam furnace, and the point of contact of slab and walking beam is changeless, thereby makes not supported base partly produce creep, the i.e. waist that collapses to add the difference of the type of furnace; And in continuous casting and rolling technique of sheet bar, adopting stove at the bottom of the roller, slab changes with the contact part of roller in heat-processed, so can not produce the waist that collapses.) in conventional the production Hazard Factor---slab " waist collapses " (creep) has not almost existed with the risk of fracture.Because not needing high Heating temperature, limit defective such as to split reduces significantly.
This patent method since adopt with (Cu, Mn)
xS is the chemical ingredients system of inhibitor, and the Composition Control ratio when smelting, casting is easier to.Because the carbon content in the steel is below 0.005%, process annealing and subsequent anneal (recrystallization annealing) need not to carry out decarburization, and it is about 50% that plate speed increases, thereby are a kind of high-level efficiency, oriented silicon steel production method cheaply.Because the aluminium content in the steel is controlled at below 0.006%, has significantly improved the quality stability of glassy membrane bottom.
Embodiment
Below be specifying of example 1-3 of the present invention.
Embodiment 1: smelt and slab tissue signature that sheet blank continuous casting forms sees Table 1, Chemical Composition such as following table 2, table 6 are listed.Above-mentioned slab carries out the 25min. reheat in temperature is 1220 ℃ of soaking pits, about 1100 ℃ of open rollings, and finishing temperature is about 900 ℃, rolls into the hot-rolled sheet of 2.2mm thickness, and coiling temperature is 550 ℃.Hot-rolled sheet is handled without normalizing, and it is cold rolling directly to carry out pickling and twice, for the first time the cold rolling formation thickness coil of strip that is 0.83mm, carry out a process annealing: at 75%H
2+ 25%N
2Atmosphere in heat up with the speed of 20 ℃/sec., 900 ℃ * 80sec., D.P. (dew point)＜0 ℃, at 100%N
2In with greater than the cooling of the speed of 5 ℃/sec..For the second time behind the cold rolling formation thickness steel plate that is 0.30mm at 75%H
2+ 25%N
2, D.P.=55 ℃ atmosphere in carry out the recrystallization annealing of 840 ℃ * 75sec. and coating of MgO slurries and oven dry.After this carry out high temperature annealing: at 75%H
2+ 25%N
2Be rapidly heated in the atmosphere to 650 ℃ * 10h, the speed with 15 ℃/h is heated to 1200 ℃ then, at 100%H
2In 1200 ℃ * 20h, hot-leveling and insulating coating, Magnetic Measurement result such as table 2 are listed.
The tissue signature of table 1 slab
| Form slab thickness | The casting pulling rate | Equiaxial crystal ratio |
| 50mm | 4.8～4.9m/min. | 75～79％ |
Table 2 chemical ingredients and corresponding magnetic values
| Numbering | C(％) | Si(％) | Mn(％) | S(％) | P(％) | Cu(％) | Al sol (％) | N(％) | Ti(％) | P 17/50 (W/kg) | B 8(T) |
| 1 | 0.003 | 3.15 | 0.065 | 0.020 | 0.010 | 0.20 | 0.0030 | 0.0040 | 0.002 | 1.22 | 1.860 |
| 2 | 0.005 | 3.19 | 0.060 | 0.018 | 0.005 | 0.16 | 0.0050 | 0.0035 | 0.003 | 1.25 | 1.865 |
| 3 | 0.002 | 3.35 | 0.065 | 0.025 | 0.008 | 0.15 | 0.0040 | 0.0015 | 0.001 | 1.21 | 1.878 |
| 4 | 0.005 | 3.05 | 0.060 | 0.023 | 0.010 | 0.19 | 0.0035 | 0.0045 | 0.002 | 1.20 | 1.870 |
| 5 | 0.004 | 3.35 | 0.070 | 0.024 | 0.006 | 0.18 | 0.0060 | 0.0055 | 0.004 | 1.23 | 1.875 |
| 6 | 0.002 | 2.90 | 0.050 | 0.025 | 0.030 | 0.18 | 0.0045 | 0.0040 | 0.005 | 1.24 | 1.870 |
| 7 | 0.003 | 3.50 | 0.045 | 0.015 | 0.015 | 0.12 | 0.0040 | 0.0025 | 0.002 | 1.20 | 1.865 |
| 8 | 0.003 | 3.00 | 0.075 | 0.024 | 0.020 | 0.18 | 0.005 | 0.0020 | 0.003 | 1.22 | 1.870 |
Embodiment 2: adopt in the table 2 hot-rolled sheet of composition in the numbering 1, except that recrystallization annealing, other operations are all by the identical technology manufacturing oriented silicon steel of embodiment 1, study the relation of recrystallization annealing process and magnetic, the results are shown in Table 3 and table 4.
The relation of table 3 recrystallization annealing process and primary recrystallization grain-size
| Numbering | Heating temperature (℃) | Soaking time (sec.) | Average grain diameter (μ m) |
| 1 | 850 | 30 | 12.0 |
| 2 | 850 | 70 | 15.5 |
| 3 | 840 | 75 | 15.0 |
| 4 | 800 | 80 | 13.6 |
| 5 | 840 | 80 | 16.0 |
Table 4 primary recrystallization grain-size and magnetic values relation
| Numbering | Mean diameter (μ m) | P 17/50(W/kg) | B 8(T) |
| 1 | 12.4 | 1.22 | 1.860 |
| 2 | 13.0 | 1.25 | 1.865 |
| 3 | 14.4 | 1.21 | 1.878 |
| 4 | 12.2 | 1.20 | 1.870 |
| 5 | 14.7 | 1.23 | 1.875 |
| 6 | 16.0 | 1.22 | 1.875 |
Embodiment 3: adopt the hot-rolled sheet of numbering composition in 1 in the table 2, adopt the recrystallization annealing process of 840 ℃ * 75sec., change the pH in the atmosphere
2O/pH
2Value, the oxygen level of research annealing back steel band and the relation of glassy membrane bottom see Table 5
The relation of table 5 oxygen level and glassy membrane bottom layer quality
| Numbering | pH 2O/pH 2 | Oxygen level (ppm) | The glassy membrane visual appearance |
| 1 | 0.29 | 800 | Evenly glossy |
| 2 | 0.22 | 650 | Evenly glossy |
| 3 | 0.20 | 570 | Evenly glossy |
| 4 | 0.17 | 480 | Evenly glossy |
| 5 | 0.16 | 420 | Even canescence |
| 6 | 0.15 | 400 | Even canescence |
Embodiment 4: press embodiment 1 identical composition and technology and make oriented silicon steel, the aluminium content in the research steel sees Table 6 to the influence of glassy membrane bottom, and φ 10mm copper rod is adopted in the tack test, grades by GB2522.Work as Al
Sol≤ 0.006% o'clock, the bottom of formation was based on positive Magnesium Silicate q-agent, and worked as Al
SolRise to 0.032% o'clock bottom based on positive Magnesium Silicate q-agent from 0.024%, in addition aluminum-spinel MgAl
2O
4Also be tangible rising tendency, Al
SolFilm forming there are bigger influence, Al
SolWhen higher, the Magnesium Silicate q-agent bottom tack that high temperature annealing forms is poor, not fine and close.Experiment shows that the aluminium content in the control steel has significantly improved the quality stability of glassy membrane bottom below 0.006%.
Table 6
| Numbering | C(％) | Si(％) | Mn (％) | S(％) | P(％) | Cu(％) | Al sol.(％) | N(％) | Ti(％) | The glassy membrane tack |
| 1 | 0.003 | 3.15 | 0.065 | 0.020 | 0.010 | 0.20 | 0.0030 | 0.0040 | 0.002 | Nothing is peeled off, the O level |
| 2 | 0.005 | 3.19 | 0.060 | 0.018 | 0.005 | 0.16 | 0.0050 | 0.0035 | 0.003 | Peel off the A level slightly |
| 3 | 0.002 | 3.35 | 0.065 | 0.025 | 0.008 | 0.15 | 0.0040 | 0.0015 | 0.001 | Nothing is peeled off, the O level |
| 4 | 0.005 | 3.05 | 0.060 | 0.023 | 0.010 | 0.19 | 0.0035 | 0.0045 | 0.002 | Peel off the A level slightly |
| 5 | 0.004 | 3.35 | 0.070 | 0.024 | 0.006 | 0.18 | 0.0060 | 0.0055 | 0.004 | Nothing is peeled off, the O level |
| 6 | 0.002 | 2.90 | 0.050 | 0.025 | 0.030 | 0.18 | 0.0045 | 0.0040 | 0.005 | Peel off the A level slightly |
| 7 | 0.003 | 3.50 | 0.045 | 0.015 | 0.015 | 0.12 | 0.0040 | 0.0025 | 0.002 | Nothing is peeled off, the O level |
| 8 | 0.003 | 3.00 | 0.075 | 0.024 | 0.020 | 0.18 | 0.0050 | 0.0020 | 0.003 | Nothing is peeled off, the O level |
Embodiment 5: smelt and the thick slab of sheet blank continuous casting formation 50mm chemical ingredients C0.002%, Si3.35%; Mn0.065%; S0.025%, P0.008%, Cu0.15%; Als0.004%; N0.0015%, by the hot-rolled sheet that the heating and the hot rolling technology of table 7 rolls into 2.2mm thickness, hot-rolled sheet is handled without normalizing; it is cold rolling directly to carry out pickling and twice, for the first time the cold rolling formation thickness coil of strip that is 0.83mm, carry out a process annealing: at 75%H
2+ 25%N
2Atmosphere in heat up with the speed of 20 ℃/sec., 900 ℃ * 80sec., D.P. (dew point)＜0 ℃, at 100%N
2In with greater than the cooling of the speed of 5 ℃/sec..For the second time behind the cold rolling formation thickness steel plate that is 0.30mm at 75%H
2+ 25%N
2, D.P.=55 ℃ atmosphere in carry out the recrystallization annealing of 840 ℃ * 75sec. and coating of MgO slurries and oven dry.After this carry out high temperature annealing: at 75%H
2+ 25%N
2Be rapidly heated in the atmosphere to 650 ℃ * 10h, the speed with 15 ℃/h is heated to 1200 ℃ then, at 100%H
2In 1200 ℃ * 20h, hot-leveling and insulating coating, the Magnetic Measurement result also lists in table 7.
Table 7 hot rolling technology and corresponding magnetic values
| Numbering | Soaking temperature (℃) | Soaking time (min.) | Start rolling temperature (℃) | Finishing temperature (℃) | Coiling temperature (℃) | P 17/50 (W/kg) | B 8(T) |
| 1 | 1150 | 30 | 1050 | 850 | 550 | 1.22 | 1.865 |
| 2 | 1250 | 20 | 1150 | 900 | 650 | 1.21 | 1.865 |
| 3 | 1200 | 25 | 1130 | 870 | 600 | 1.20 | 1.878 |
| 4 | 1220 | 25 | 1100 | 900 | 550 | 1.20 | 1.870 |
Embodiment 6: smelt and sheet blank continuous casting forms the thick slab of 50mm, chemical ingredients is ℃ 0.002%, Si3.35%, Mn0.065%, S0.025%, P0.008%, Cu0.15%, Als0.004%, N0.0015%.Above-mentioned slab carries out the 25min. reheat in temperature is 1220 ℃ of soaking pits, about 1100 ℃ of open rollings, and finishing temperature is about 900 ℃, rolls into the hot-rolled sheet of 2.2mm thickness, and coiling temperature is 550 ℃.Hot-rolled sheet is handled without normalizing, and it is cold rolling directly to carry out pickling and twice, for the first time the cold rolling formation thickness coil of strip that is 0.83mm, then at 75%H
2+ 25%N
2, D.P. (dew point)＜0 ℃ atmosphere in, carry out a process annealing by table 8 parameter and annealing, at 100%N
2In with greater than after the cooling of the speed of 5 ℃/sec., it is cold rolling to carry out second time, formation thickness is the steel plate of 0.30mm.After this at 75%H
2+ 25%N
2, D.P.=55 ℃ atmosphere in carry out the recrystallization annealing of 840 ℃ * 75sec. and coating of MgO slurries and oven dry.After this carry out high temperature annealing: at 75%H
2+ 25%N
2Be rapidly heated in the atmosphere to 650 ℃ * 10h, the speed with 15 ℃/h is heated to 1200 ℃ then, at 100%H
2In 1200 ℃ * 20h, hot-leveling and insulating coating, Magnetic Measurement result such as table 8 are listed.
Table 8 intermediate annealing process and corresponding magnetic values
| Numbering | Heat-up rate (℃/sec.) | Holding temperature (℃) | Soaking time (sec.) | P 17/50 (W/kg) | B 8(T) |
| 1 | 20 | 900 | 80 | 1.20 | 1.870 |
| 2 | 15 | 800 | 50 | 1.21 | 1.865 |
| 3 | 12 | 1000 | 30 | 1.20 | 1.878 |
| 4 | 10 | 950 | 100 | 1.22 | 1.870 |
Claims (13)
1. oriented silicon steel based on CSP, its composition is (weight percent):
C：≤0.005
Si：2.9～3.5
Mn：0.045～0.075
S：0.015～0.025
P：≤0.030
Al
sol≤0.006
N：0.0015～0.0055
Cu：0.12～0.20
Ti：≤0.005
All the other are Fe and unavoidable impurities.
2. oriented silicon steel according to claim 1 is characterized in that, described C content is≤0.003, by weight percentage.
3. oriented silicon steel according to claim 1 is characterized in that, described Al
Sol. content is≤0.0045, by weight percentage.
4. oriented silicon steel according to claim 1 is characterized in that, described Si content is between 3.05～3.35, by weight percentage.
5. oriented silicon steel according to claim 1 is characterized in that, described Mn content is between 0.050～0.065, by weight percentage.
6. oriented silicon steel according to claim 1 is characterized in that, described N content is between 0.0015～0.0040, by weight percentage.
7. oriented silicon steel according to claim 1 is characterized in that, described Cu content is between 0.15～0.19, by weight percentage.
8. oriented silicon steel according to claim 1 is characterized in that, described Ti content is smaller or equal to 0.003, by weight percentage.
9. the manufacture method of oriented silicon steel according to claim 1, comprise and adopt routine techniques to form the thin plate strand, through hot rolling, cold rolling, process annealing, high-temperature annealing step, it is characterized in that, after process annealing and before the high temperature annealing, also comprise the step of the steel plate that rolls finished product thickness being carried out recrystallization annealing, in this step, heat up with about 25 ℃/second speed, in 800～850 ℃ of temperature ranges, kept 30～80 seconds; Regulate the pH in the atmosphere
2O/pH
2Value, the Control for Oxygen Content that makes annealing back steel band is between 400～800ppm, after this at 100%N
2Middle cooling.
10. method according to claim 9 is characterized in that the step of described recrystallization annealing is at 75%H
2+ 25%N
2Atmosphere in heat up, after the annealing grain-size is controlled at below the 16 μ m.
11. according to claim 9 or 10 described methods, it is characterized in that, also comprise in described recrystallization annealing step: being coated with MgO is the high temperature annealing separant and the oven dry of main component again.
12. method according to claim 9, it is characterized in that described hot rolled step comprises: strand soaking 20～30 minutes in temperature is 1150～1250 ℃ of roller hearth type heating furnaces, 1050～1150 ℃ of open rollings, temperature finish to gauge more than 850 ℃, coiling temperature is below 650 ℃.
13. method according to claim 12 is characterized in that, the step of described process annealing comprises: heat up with 10～20 ℃/second speed, be incubated 30～100 seconds in 800～1000 ℃ of temperature ranges, at 75%H
2+ 25%N
2In the atmosphere, D.P.＜0 ℃ is with the speed cooling greater than 5 ℃/second.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101545072B (en) * | 2008-03-25 | 2012-07-04 | 宝山钢铁股份有限公司 | Method for producing oriented silicon steel having high electromagnetic performance |
| CN104313469A (en) * | 2014-09-28 | 2015-01-28 | 东北大学 | Ultra-low carbon oriented silicon steel plate and preparation method thereof |
| WO2016045158A1 (en) * | 2014-09-28 | 2016-03-31 | 东北大学 | Oriented ultra-low carbon silicon steel and preparation method therefor |
| CN117701829A (en) * | 2024-02-06 | 2024-03-15 | 包头市威丰稀土电磁材料股份有限公司 | Nitrogen control method for oriented silicon steel |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100667B (en) * | 1985-04-01 | 1986-12-10 | 冶金部钢铁研究总院 | Low iron loss high magnetic sensitive cold-rolled orientation silicon steel and its mfr. method |
| JPH05156361A (en) * | 1991-10-28 | 1993-06-22 | Nippon Steel Corp | Manufacture of grain-oriented electric steel sheet excellent in magnetic property |
| JP2562257B2 (en) * | 1992-07-10 | 1996-12-11 | 新日本製鐵株式会社 | Method for producing unidirectional electrical steel sheet with excellent magnetic properties |
| US5653821A (en) * | 1993-11-09 | 1997-08-05 | Pohang Iron & Steel Co., Ltd. | Method for manufacturing oriented electrical steel sheet by heating slab at low temperature |
| IT1290172B1 (en) * | 1996-12-24 | 1998-10-19 | Acciai Speciali Terni Spa | PROCEDURE FOR THE PRODUCTION OF GRAIN ORIENTED MAGNETIC SHEETS, WITH HIGH MAGNETIC CHARACTERISTICS. |
| CN1264748A (en) * | 2000-03-03 | 2000-08-30 | 武汉钢铁(集团)公司 | Technology for producing wide band of orientated silicon steel with thickness less than or equal to 0.15mm |
-
2005
- 2005-11-30 CN CNB2005101110067A patent/CN100455690C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101545072B (en) * | 2008-03-25 | 2012-07-04 | 宝山钢铁股份有限公司 | Method for producing oriented silicon steel having high electromagnetic performance |
| CN104313469A (en) * | 2014-09-28 | 2015-01-28 | 东北大学 | Ultra-low carbon oriented silicon steel plate and preparation method thereof |
| WO2016045158A1 (en) * | 2014-09-28 | 2016-03-31 | 东北大学 | Oriented ultra-low carbon silicon steel and preparation method therefor |
| CN117701829A (en) * | 2024-02-06 | 2024-03-15 | 包头市威丰稀土电磁材料股份有限公司 | Nitrogen control method for oriented silicon steel |
| CN117701829B (en) * | 2024-02-06 | 2024-04-26 | 包头市威丰稀土电磁材料股份有限公司 | Nitrogen control method for oriented silicon steel |
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