CN105018847B - Extremely-thin oriented silicon steel plate based on two-roll thin-strip continuous casting and manufacturing method of extremely-thin oriented silicon steel plate - Google Patents

Extremely-thin oriented silicon steel plate based on two-roll thin-strip continuous casting and manufacturing method of extremely-thin oriented silicon steel plate Download PDF

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CN105018847B
CN105018847B CN201510418360.8A CN201510418360A CN105018847B CN 105018847 B CN105018847 B CN 105018847B CN 201510418360 A CN201510418360 A CN 201510418360A CN 105018847 B CN105018847 B CN 105018847B
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CN105018847A (en
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刘海涛
宋红宇
王银平
张宝光
安灵子
赵士淇
刘文强
曹光明
李成刚
刘振宇
王国栋
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Northeastern University China
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Abstract

Provided are an extremely-thin oriented silicon steel plate based on two-roll thin-strip continuous casting and a manufacturing method of the extremely-thin oriented silicon steel plate. The steel plate comprises, by mass, 0.002%-0.08% of C, 2.8%-3.4% of Si, 0.05%-0.30% of Mn, 0.015%-0.04% of S, 0.005%-0.05% of Als, 0.003%-0.010% of N, 0.01%-0.5% of Ti, 0-0.6% of Cu, 0-0.2% of Sn, O smaller than 0.004%, P smaller than 0.01% and the balance Fe. The thickness of the extremely-thin oriented silicon steel plate ranges from 0.05 mm to 0.15 mm. The method comprises the steps that 1, molten steel is smelted; 2, a cast strip is obtained through continuous casting; 3, hot rolling is carried out after cooling, and then winding is carried out; 4, cooling control is carried out after normalizing annealing; 5, primary cold rolling is carried out after acid pickling, and then primary intermediate annealing is carried out; 6, secondary cold rolling is carried out after acid pickling, and then secondary intermediate annealing is carried out; 7, cold rolling is carried out for the third time after acid pickling; 8, decarbonization and annealing are carried out; 9, annealing parting agents are smeared; and 10, purification annealing is carried out after high-temperature annealing. The method is simple and effective, and is characterized by being short in process, easy to control and low in energy consumption.

Description

A kind of very thin directional silicon steel and its manufacture method based on twin-roll thin strip continuous casting
Technical field
The invention belongs to electrician's steel making field, and in particular to a kind of very thin directional silicon steel based on twin-roll thin strip continuous casting And its manufacture method.
Background technology
Orientation silicon steel is a kind of important soft magnetic materials, is that power industry develops not mainly for the production of transformer core One of material that can or lack.The magnetic property index of orientation silicon steel mainly includes magnetic induction intensity(B)And iron loss(Pr), iron loss is direct The core loss being related to when the power transmission and transformation such as transformer product is on active service, it may be said that the history of oriented silicon steel development is exactly iron Damage the history for constantly declining;At present, people are devoted to obtaining the orientation silicon steel of lower iron loss, to meet the electronics work of fast development Demand of the industry to magnetic material, reduces can core volume, and can save substantial amounts of electric energy.By research and practice, It is recognized that it is effective method to realize that iron loss is greatly lowered by thinning thickness of slab;But, using secondary recrystallization During method production orientation silicon steel, there is a limit, typically about 0.15mm or so, when finished product is less than this thickness in the thickness of finished product When, due to decomposition of the inhibitor in high-temperature annealing process and diffusion aggravation, cause rejection ability to decline, the secondary of finished product is tied again Brilliant imperfection, or secondary recrystallization cannot occur, cause magnetic property and stability all extreme differences.
Currently, people obtain the orientation silicon steel thin belt of thickness≤0.15mm using tertiary recrystallization technique, and its driving force is Variant position to crystal grain free surface energy it is poor, concrete technology is:It is cold rolling after to industrial orientation silicon steel finished product acid-washing To 0.15mm and following, re-annealing acquisition orientation silicon steel thin belt.The defect that above-mentioned production technology is present is:Strip is easy when cold rolling Raw edges, broken belt, cold rolling efficiency is low.For the deficiency of above-mentioned production technology, patent CN 1562511A discloses a kind of new orientation The manufacture method of silicon steel thin belt, its concrete grammar is:With the finished product directional silicon steel after secondary recrystallization as raw material, adopt after pickling With cross-shear rolling, then the annealed orientation silicon steel thin belt for obtaining thickness for 0.06 ~ 0.1mm.Side disclosed in patent CN1562511A Method instead of synchronous cold rolling compared with conventional orientation silicon steel thin belt production technology with cross-shear rolling, improve plate shape;But, The patent and existing technique are all to obtain orientation silicon steel thin belt using the method for tertiary recrystallization, with the finished product of orientation silicon steel Plate is raw material, and the traditional mode of production flow process of orientation silicon steel is present, and product defects is more, lumber recovery is low, energy resource consumption is big, environmental pollution Serious the shortcomings of.
The content of the invention
It is an object of the invention to provide a kind of very thin directional silicon steel and its manufacture method based on twin-roll thin strip continuous casting, fills Advantage and potentiality of the twin-roll thin strip continuous casting technology in orientation silicon steel tissue, texture and inhibitor regulation and control is waved in distribution, by composition Design and Row control, obtain very thin oriented silicon steel, and with the characteristics of short route, easy to control, low energy consumption.
The present invention the very thin directional silicon steel based on twin-roll thin strip continuous casting composition by mass percentage for C 0.002 ~ 0.08%, Si 2.8 ~ 3.4%, Mn 0.05 ~ 0.30%, S 0.015 ~ 0.04%, Als 0.005 ~ 0.05%, N 0.003 ~ 0.010%, Ti 0.01 ~ 0.5%, Cu 0 ~ 0.6%, Sn 0 ~ 0.2%, O<0.004%, P<0.01%, balance of Fe.
The magnetic strength B of above-mentioned very thin orientation silicon steel8For 1.72 ~ 1.84T.
Iron loss P of above-mentioned very thin orientation silicon steel10/400For 6.6 ~ 8.2W/kg, iron loss P10/1000For 19.1 ~ 27.4W/kg.
The thickness of above-mentioned very thin orientation silicon steel is in 0.05 ~ 0.15mm.
The manufacture method of the very thin directional silicon steel based on twin-roll thin strip continuous casting of the present invention is comprised the following steps:
1st, by set component smelting molten steel, composition is by mass percentage:C 0.002 ~ 0.08%, Si 2.8 ~ 3.4%, Mn 0.05 ~ 0.30%, S 0.015 ~ 0.04%, Als 0.005 ~ 0.05%, N 0.003 ~ 0.010%, Ti 0.01 ~ 0.5%, Cu 0 ~ 0.6%, Sn 0 ~ 0.2%, O<0.004%, P<0.01%, balance of Fe;
2nd, using twin-roll thin strip continuous casting device, molten steel Jing tundish is poured into and is made up of two crystallization rolls and two pieces of side seal boards Cavity in form molten bath, control the molten bath upper surface degree of superheat for 10 ~ 70 DEG C, the molten steel in molten bath is solidifying with the rotation of crystallization roll Gu and derived with the speed of 20 ~ 60m/min, acquisition Cast Strip;
3rd, Cast Strip carries out hot rolling Jing after cooling unit is with the speed cooling of 20 ~ 100 DEG C/s, and start rolling temperature is 900 ~ 1150 DEG C, hot rolling reduction ratio is 15 ~ 50%, and finishing temperature is cooled to 650 DEG C after hot rolling more than 850 DEG C with the speed of 20 ~ 100 DEG C/s Below and batch, obtain hot rolled coil;
4th, hot rolled coil is carried out into one section of normalizing annealing or two sections of normalizing annealings;The temperature of one section of normalizing method is 850 ~ 1150 DEG C, the time is 1 ~ 10min;The high temperature section temperature of two sections of normalizing methods be 1050 ~ 1150 DEG C, the time be 1 ~ 5min, the temperature of low-temperature zone Spend for 850 ~ 1050 DEG C, the time is 1 ~ 5min;Cooling is controlled after normalizing treatment, cooling velocity is 5 ~ 50 DEG C/s, is cooled to Normal temperature obtains normalizing plate;
5th, the pickling of normalizing plate being removed into scale on surface, then carries out once cold rolling, once cold rolling reduction ratio is 40 ~ 70%;Then an intermediate annealing is carried out, temperature is 800 ~ 1000 DEG C, and the time is 3 ~ 10min, obtains an intermediate annealing plate;
6th, an intermediate annealing plate pickling is removed into scale on surface, then carries out secondary cold-rolling, secondary cold-rolling pressure Rate is 40 ~ 70%;Then secondary intermediate annealing is carried out, temperature is 800 ~ 1000 DEG C, and the time is 3 ~ 10min, obtains secondary centre and moves back Fiery plate;
7th, by secondary intermediate annealing plate pickling remove scale on surface, then carry out three times it is cold rolling, under three cold rollings Rate is 70 ~ 95%;
8th, by three cold rolled sheet decarburizing annealing, temperature is 800 ~ 900 DEG C, and the time is 3 ~ 10min;
9th, the plate surface coating annealing separating agent after decarburizing annealing;
10th, the sheet material of coating annealing separating agent is heated to into 800 ± 10 DEG C, is then warming up to the speed of 10 ~ 30 DEG C/h 1200 ± 10 DEG C complete high annealing, then are incubated at least 20h at 1200 ± 10 DEG C, complete pure annealing, most after Jing uncoilings, flat Whole stretching annealing and insulating barrier coating, make very thin directional silicon steel.
The width of above-mentioned Cast Strip is 100 ~ 2000mm.
In said method, the contact arc length of molten steel and crystallization roll roll surface is 100 ~ 250mm, the height in molten bath is 80 ~ 220mm。
In said method, an atmosphere when intermediate annealing and secondary intermediate annealing is the mixed atmosphere of hydrogen and nitrogen, The percent by volume of hydrogen is 50%, and the dew point of mixed gas is 20 ~ 45 DEG C.
In said method, atmosphere during decarburizing annealing is the mixed atmosphere of hydrogen and nitrogen, and the percent by volume of hydrogen is 50%, the dew point of mixed gas is 20 ~ 45 DEG C.
In said method, atmosphere during high annealing is the mixed atmosphere of hydrogen and nitrogen, and the percent by volume of hydrogen is 75%, atmosphere during pure annealing is hydrogen atmosphere.
Twin-roll thin strip continuous casting is the technology that a kind of liquid metal is directly produced thin strip, and it has Sub realizable fuzzy matrix(102 ~104℃/s)Characteristic.Under the conditions of Sub realizable fuzzy matrix, the more inhibitor of solid solution can be formed in the base of orientation silicon steel Cast Strip Element, is conducive to obtaining more tiny, disperse inhibitor particles in follow-up processing procedure, so as to improve restraint.This Outward, the hot rolled plate thinner than traditional handicraft can be obtained using strip continuous casting technology.These are all beneficial to prepare very thin taking To silicon steel plate.
Of the invention the characteristics of and beneficial effect are:
(1)Very thin orientation silicon steel is prepared by annealing using twin-roll thin strip continuous casting technology, three step cold-rolling practices and secondary recrystallization Plate, enormously simplify existing production technology, and manufacture method is simple, effectively, with the characteristics of short route, easy to control, low energy consumption;
(2)The Ti elements added in composition can combine to form high-melting-point in strip casting process with the element such as sulphur, oxygen Precipitate, serves as the core of heterogeneous forming core, so as to refine initial solidification tissue, is conducive to follow-up organizational controls, and improves modeling Property and toughness, are conducive to cold rolling;Ti elements can be separated out with forming tiny, disperse TiS, TiMnS etc. in hot rolling and normalizing Thing, can together with AlN and MnS inhibiting grain growth, improve restraint, advantageously form tiny and uniform for the first time crystal grain, So as to obtain very thin directional silicon steel.
Description of the drawings
Fig. 1 is that the manufacturing approach craft flow process of the very thin directional silicon steel based on twin-roll thin strip continuous casting of the present invention is illustrated Figure.
Specific embodiment
Contact arc length in the embodiment of the present invention and comparative example is 100 ~ 250mm, and the height in molten bath is 80 ~ 220mm.
A diameter of 500 ~ the 1000mm of crystallization roll of the double roller continuous casting device adopted in the embodiment of the present invention and comparative example.
The width of the Cast Strip obtained in the embodiment of the present invention and comparative example is 100 ~ 2000mm.
The magnetic property data of product are on MATS-2010M type magnetism testing instrument in the embodiment of the present invention and comparative example Obtained using the test of monolithic method of testing.
Annealing separating agent in the embodiment of the present invention is magnesia.
An intermediate annealing and gaseous mixture that atmosphere during secondary intermediate annealing is hydrogen and nitrogen in the embodiment of the present invention Atmosphere, the percent by volume of hydrogen is 50%, and the dew point of mixed gas is 20 ~ 45 DEG C.
Atmosphere in the embodiment of the present invention during decarburizing annealing is hydrogen and the mixed atmosphere of nitrogen, the percent by volume of hydrogen For 50%, the dew point of mixed gas is 20 ~ 45 DEG C.
Atmosphere when embodiment of the present invention high temperature is annealed is hydrogen and the mixed atmosphere of nitrogen, the percent by volume of hydrogen For 75%, atmosphere during pure annealing is hydrogen atmosphere.
Embodiment 1
The molten steel composition of very thin directional silicon steel is C 0.06%, Si 3.1%, Mn 0.20%, S according to mass percent 0.025%, Als 0.02%, N 0.009%, Ti 0.07%, O<0.004%, P<0.01%, balance of Fe;Magnetic strength B8For 1.80T, iron Damage P10/400For 6.7W/kg, iron loss P10/1000For 22.5W/kg, thickness 0.1mm;
Manufacture method is comprised the following steps:
By set component smelting molten steel, composition is ibid;
Using twin-roll thin strip continuous casting device, molten steel Jing tundish is poured into into what is be made up of two crystallization rolls and two pieces of side seal boards Molten bath is formed in cavity, the molten bath upper surface degree of superheat is controlled for 40 DEG C, the molten steel in molten bath solidifies simultaneously with the rotation of crystallization roll Derived with the speed of 40m/min, obtain Cast Strip;
Cast Strip carries out hot rolling Jing after cooling unit is with the speed cooling of 20 ~ 100 DEG C/s, and start rolling temperature is 1000 DEG C, hot rolling Reduction ratio is 33.3%, and finishing temperature with the speed of 60 DEG C/s is cooled to less than 650 DEG C and batches more than 850 DEG C, after hot rolling, Obtain hot rolled coil;
Hot rolled coil is carried out into one section of normalizing annealing, temperature is 1000 DEG C, and the time is 6min;
The pickling of normalizing plate is removed into scale on surface, once cold rolling is then carried out, once cold rolling reduction ratio is 50%;So After carry out an intermediate annealing, temperature is 900 DEG C, and the time is 6min, obtains an intermediate annealing plate;
Intermediate annealing plate pickling is removed into scale on surface, secondary cold-rolling, secondary cold-rolling reduction ratio is then carried out For 60%;Then secondary intermediate annealing is carried out, temperature is 900 DEG C, and the time is 5min, obtains secondary intermediate annealing plate;
Secondary intermediate annealing plate pickling is removed into scale on surface, three cold rolling, three cold rolling reduction ratios are then carried out For 85%;
It it is 850 DEG C by three cold rolled sheet decarburizing annealing, temperature, the time is 6min;
Plate surface coating annealing separating agent after decarburizing annealing;
The sheet material of coating annealing separating agent is heated to into 800 ± 10 DEG C, then 1200 are warming up to the speed of 20 DEG C/h ± 10 DEG C complete high annealing, then are incubated 20h at 1200 ± 10 DEG C, complete pure annealing, most after Jing uncoilings, smooth stretching annealing With insulating barrier coating, very thin directional silicon steel is made;
Contrast experiment is carried out as stated above using the steel plate of heterogeneity, molten steel composition is according to mass percent: 0.04%C, 3.0%Si, 0.04%Mn, 0.05%S, 0.02%Als, 0.02%N, O<0.004%, P<0.01%, balance of Fe;Magnetic strength B8 For 1.64T, iron loss P10/400For 11.9W/kg, iron loss P10/1000For 28.8W/kg.
Embodiment 2
The molten steel composition of very thin directional silicon steel is C 0.002%, Si 2.8%, Mn 0.05%, S according to mass percent 0.015%, Als 0.005%, N 0.003%, Ti 0.5%, Cu 0.3%, Sn 0.1%, O<0.004%, P<0.01%, balance of Fe; Magnetic strength B8For 1.73T, iron loss P10/400For 8.0W/kg, iron loss P10/1000For 19.1W/kg, thickness 0.05mm;
Manufacture method is with embodiment 1, difference:
(1)Molten steel composition is ibid;
(2)The molten bath upper surface degree of superheat is 10 DEG C, and the molten steel in molten bath is derived with the speed of 60m/min;
(3)Cast Strip is cooled down with the speed of 20 DEG C/s, and hot rolling start rolling temperature is 900 DEG C, and reduction ratio is 15%, with 20 after hot rolling DEG C/cooling of the speed of s;
(4)The temperature of normalizing annealing is 850 DEG C, and the time is 10min;
(5)Once cold rolling reduction ratio is 70%;One time intermediate anneal temperature is 800 DEG C, and the time is 10min;
(6)Secondary cold-rolling reduction ratio is 40%;Secondary intermediate anneal temperature is 800 DEG C, and the time is 10min;
(7)Three times cold rolling reduction ratio is 95%;
(8)Decarburization annealing temperature is 800, and the time is 10min;
(9)1200 ± 10 DEG C are warming up to the speed of 10 DEG C/h and complete high annealing, be incubated 24h at 1200 ± 10 DEG C and complete Pure annealing;
Contrast experiment is carried out as stated above using the steel plate of heterogeneity, molten steel composition is according to mass percent: 0.06%C, 3.2%Si, 0.03%Mn, 0.03%S, 0.12%Als, 0.009%N, 0.09%Ti, O<0.004%, P<0.01%, it is balance of Fe;Magnetic strength B8For 1.63T, iron loss P10/400For 10.9W/kg, iron loss P10/1000For 28.6W/kg.
Embodiment 3
The molten steel composition of very thin directional silicon steel is C 0.08%, Si 3.4%, Mn 0.30%, S according to mass percent 0.04%, Als 0.05%, N 0.01%, Ti 0.01%, Cu 0.6%, Sn 0.2%, O<0.004%, P<0.01%, balance of Fe;Magnetic Sense B8For 1.84T, iron loss P10/400For 6.7W/kg, iron loss P10/1000For 26.8W/kg, thickness 0.15mm;
Manufacture method is with embodiment 1, difference:
(1)Molten steel composition is ibid;
(2)The molten bath upper surface degree of superheat is 70 DEG C, and the molten steel in molten bath is derived with the speed of 20m/min;
(3)Cast Strip is cooled down with the speed of 100 DEG C/s, and hot rolling start rolling temperature is 1150 DEG C, and reduction ratio is 50%, after hot rolling with The speed cooling of 100 DEG C/s;
(4)The temperature of normalizing annealing is 1150 DEG C, and the time is 1min;
(5)Once cold rolling reduction ratio is 40%;One time intermediate anneal temperature is 1000 DEG C, and the time is 3min;
(6)Secondary cold-rolling reduction ratio is 70%;Secondary intermediate anneal temperature is 1000 DEG C, and the time is 3min;
(7)Three times cold rolling reduction ratio is 70%;
(8)Decarburization annealing temperature is 900 DEG C, and the time is 3min;
(9)1200 ± 10 DEG C are warming up to the speed of 30 DEG C/h and complete high annealing, be incubated 22h at 1200 ± 10 DEG C and complete Pure annealing;
Contrast experiment is carried out as stated above using the steel plate of heterogeneity, molten steel composition is according to mass percent: 0.07%C, Si 2.9%, 0.03%Mn, 0.06%S, 0.1%Als, 0.02%N, 0.3%Cu, O<0.004%, P<0.01%, it is balance of Fe;Magnetic strength B8For 1.68T, iron loss P10/400For 10.6W/kg, iron loss P10/1000For 31.3W/kg.
Embodiment 4
The molten steel composition of very thin directional silicon steel is with embodiment 1, magnetic strength B8For 1.81T, iron loss P10/400For 6.6W/kg, iron Damage P10/1000For 22.3W/kg;
Manufacture method is with embodiment 1, difference:Normalizing annealing is carried out using two sections of normalizing methods, high temperature section temperature is 1050 ~ 1150 DEG C, the time is 1 ~ 5min, and the temperature of low-temperature zone is 850 ~ 1050 DEG C, and the time is 1 ~ 5min;Controlling cooling velocity is 5~50℃/s。
Embodiment 5
The molten steel composition of very thin directional silicon steel is with embodiment 2, magnetic strength B8For 1.72T, iron loss P10/400For 8.2W/kg, iron Damage P10/1000For 19.4W/kg;
Manufacture method is with embodiment 2, difference:Normalizing annealing is carried out using two sections of normalizing methods, high temperature section temperature is 1050 ~ 1150 DEG C, the time is 1 ~ 5min, and the temperature of low-temperature zone is 850 ~ 1050 DEG C, and the time is 1 ~ 5min;Controlling cooling velocity is 5~50℃/s。
Embodiment 6
The molten steel composition of very thin directional silicon steel is with embodiment 3, magnetic strength B8For 1.82T, iron loss P10/400For 7.1W/kg, iron Damage P10/1000For 27.4W/kg;
Manufacture method is with embodiment 3, difference:Normalizing annealing is carried out using two sections of normalizing methods, high temperature section temperature is 1050 ~ 1150 DEG C, the time is 1 ~ 5min, and the temperature of low-temperature zone is 850 ~ 1050 DEG C, and the time is 1 ~ 5min;Controlling cooling velocity is 5~50℃/s。

Claims (5)

1. a kind of manufacture method of the very thin directional silicon steel based on twin-roll thin strip continuous casting, it is characterised in that comprise the following steps:
(1)By set component smelting molten steel, composition is by mass percentage:C 0.002 ~ 0.08%, Si 2.8 ~ 3.4%, Mn 0.05 ~ 0.30%, S 0.015 ~ 0.04%, Als 0.005 ~ 0.05%, N 0.003 ~ 0.010%, Ti 0.01 ~ 0.5%, Cu 0 ~ 0.6%, Sn 0 ~ 0.2%, O<0.004%, P<0.01%, balance of Fe;
(2)Using twin-roll thin strip continuous casting device, molten steel Jing tundish is poured into into what is be made up of two crystallization rolls and two pieces of side seal boards Molten bath is formed in cavity, the molten bath upper surface degree of superheat is controlled for 10 ~ 70 DEG C, the molten steel in molten bath solidifies with the rotation of crystallization roll And derived with the speed of 20 ~ 60m/min, obtain Cast Strip;
(3)Cast Strip carries out hot rolling Jing after cooling unit is with the speed cooling of 20 ~ 100 DEG C/s, and start rolling temperature is 900 ~ 1150 DEG C, heat It is 15 ~ 50% to roll reduction ratio, and finishing temperature is cooled to less than 650 DEG C after hot rolling more than 850 DEG C with the speed of 20 ~ 100 DEG C/s And batch, obtain hot rolled coil;
(4)Hot rolled coil is carried out into one section of normalizing annealing or two sections of normalizing annealings;The temperature of one section of normalizing method is 850 ~ 1150 DEG C, when Between be 1 ~ 10min;The high temperature section temperature of two sections of normalizing methods is 1050 ~ 1150 DEG C, and the time is 1 ~ 5min, and the temperature of low-temperature zone is 850 ~ 1050 DEG C, the time is 1 ~ 5min;Cooling is controlled after normalizing treatment, cooling velocity is 5 ~ 50 DEG C/s, is cooled to normal temperature Obtain normalizing plate;
(5)The pickling of normalizing plate is removed into scale on surface, once cold rolling is then carried out, once cold rolling reduction ratio is 40 ~ 70%; Then an intermediate annealing is carried out, temperature is 800 ~ 1000 DEG C, and the time is 3 ~ 10min, obtains an intermediate annealing plate;
(6)Intermediate annealing plate pickling is removed into scale on surface, secondary cold-rolling is then carried out, secondary cold-rolling reduction ratio is 40~70%;Then secondary intermediate annealing is carried out, temperature is 800 ~ 1000 DEG C, and the time is 3 ~ 10min, obtains secondary intermediate annealing Plate;
(7)By secondary intermediate annealing plate pickling remove scale on surface, then carry out three times it is cold rolling, three times cold rolling reduction ratio is 70~95%;
(8)By three cold rolled sheet decarburizing annealing, temperature is 800 ~ 900 DEG C, and the time is 3 ~ 10min;
(9)Plate surface coating annealing separating agent after decarburizing annealing;
(10)The sheet material of coating annealing separating agent is heated to into 800 ± 10 DEG C, then 1200 is warming up to the speed of 10 ~ 30 DEG C/h ± 10 DEG C complete high annealing, then are incubated at least 20h at 1200 ± 10 DEG C, complete pure annealing, most after Jing uncoilings, smooth drawing Annealing and insulating barrier coating are stretched, very thin directional silicon steel is made, its magnetic strength B8For 1.72 ~ 1.84T, thickness in 0.05 ~ 0.15mm, Iron loss P10/400For 6.6 ~ 8.2W/kg, iron loss P10/1000For 19.1 ~ 27.4W/kg.
2. the manufacture method of the very thin directional silicon steel based on twin-roll thin strip continuous casting according to claim 1, its feature exists In step(2)The contact arc length of molten steel and crystallization roll roll surface be 100 ~ 250mm, the height in molten bath is 80 ~ 220mm.
3. the manufacture method of the very thin directional silicon steel based on twin-roll thin strip continuous casting according to claim 1, its feature exists In step(5)With(6)Intermediate annealing when atmosphere be hydrogen and nitrogen mixed atmosphere, the percent by volume of hydrogen is 50%, The dew point of mixed gas is 20 ~ 45 DEG C.
4. the manufacture method of the very thin directional silicon steel based on twin-roll thin strip continuous casting according to claim 1, its feature exists In step(9)Decarburizing annealing when atmosphere be hydrogen and nitrogen mixed atmosphere, the percent by volume of hydrogen is 50%, mixing The dew point of gas is 20 ~ 45 DEG C.
5. the manufacture method of the very thin directional silicon steel based on twin-roll thin strip continuous casting according to claim 1, its feature exists In step(10)High annealing when atmosphere be hydrogen and nitrogen mixed atmosphere, the percent by volume of hydrogen is 75%, pure Atmosphere during annealing is hydrogen atmosphere.
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