CN107164691B - A method of cube doubly oriented silicon steel is prepared based on thin strap continuous casting - Google Patents

A method of cube doubly oriented silicon steel is prepared based on thin strap continuous casting Download PDF

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CN107164691B
CN107164691B CN201710402819.4A CN201710402819A CN107164691B CN 107164691 B CN107164691 B CN 107164691B CN 201710402819 A CN201710402819 A CN 201710402819A CN 107164691 B CN107164691 B CN 107164691B
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silicon steel
oriented silicon
strip
doubly oriented
cold
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CN107164691A (en
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张元祥
方烽
兰梦飞
卢翔
王洋
曹光明
李成刚
袁国
王国栋
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Northeastern University China
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
    • C21D8/1211—Rapid solidification; Thin strip casting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1222—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1233—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1261—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1272—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • C21D8/1283—Application of a separating or insulating coating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium

Abstract

The invention belongs to metallurgical technology field, more particularly to a kind of method that cube doubly oriented silicon steel is prepared based on thin strap continuous casting.It carries out according to the following steps：(1) set component smelting molten steel is pressed, ingredient is by weight percentage：C 0.002~0.005%, Si 1.5~3.0%, Mn 0.05~0.2%, Al≤0.005%, P≤0.008%, S 0.005~0.01%, N≤0.002%, O≤0.002%, surplus are Fe and inevitable impurity；(2) Cast Strip is formed after strip casting process；(3) a time hot rolling is carried out under inert atmosphere conditions；(4) Al will be applied after hot rolling band pickling2O3It is batched again after interleaving agent；(5) hot rolling carries out long-time pretreatment into bell furnace；(6) cold rolling is carried out after clearing up interleaving agent；(7) cold rolling coil carries out two benches recrystallization annealing；(8) insulating layer coating is applied, cubic texture doubly oriented silicon steel finished product is obtained.The present invention is pre-processed by Cast Strip, enhances { 100 } texture intensity in initial structure, is based on cold rolling-two benches annealing process system, obtains { 100 } <001>The doubly oriented silicon steel of texture abnormal grain growth.

Description

A method of cube doubly oriented silicon steel is prepared based on thin strap continuous casting
Technical field
The invention belongs to metallurgical technology field, more particularly to a kind of side preparing cube doubly oriented silicon steel based on thin strap continuous casting Method.
Background technology
Cubic texture double orientation generally contains 1.8~3.4%Si, and texture is steel plate laterally and rolls to being easy magnetization Direction, without difficult magnetization &lt in plate face;111>Direction.Therefore, cube doubly oriented silicon steel in transverse direction and is rolled to there is excellent magnetism Can, which dictates that cubic texture doubly oriented silicon steel, in efficient, electric rotating machine, the fields such as transformer and space shuttle have wide Application prospect.But since cubic texture is not that texture is stablized in rolling, the texture controlling of cubic texture double orientation is The hot and difficult issue of magnetic material research in recent years.
Currently, the direction of research, which focuses mostly on, is utilizing surface energy, right-angled intersection rolling and vacuum decarburization demanganize technology hand The control of Duan Shixian cubic textures.Method using surface energy is in dry H2Atmospheric condition, hot stage carry out long term annealing, Using the extremely low surface energy advantage in (100) face as driving force, steel band is thinner, and cubic texture development is more perfect.This prepares cubic texture Doubly oriented silicon steel method is limited to the steel strip surface state of strip so that and its manufacturing process is complicated, and lumber recovery is low and of high cost, and Final finished magnetic property is not high.The method and process that cube doubly oriented silicon steel is prepared using right-angled intersection rolling technique is complicated, difficult Produced in enormous quantities with continuous realization, cost is higher and efficiency is low.Method using vacuum decarburization demanganize is by electrical sheet in vacuum Middle carry out long-time at elevated temperature, the cubic texture that surface of silicon steel is formed develop to center portion, ultimately form stronger cubic texture. This method has the potentiality of serialization industrialized production, but due to, institute more demanding for chemical composition and annealing conditions With the difficulty that physical presence is larger.
Liquid molten steel is directly injected into casting roll and side by twin-roll thin strip continuous casting technology using two casting rolls of rotation as crystallizer Sealing plate composition molten bath in, by the direct solidification forming thickness of liquid molten steel be 1~6mm strips, can be not required to by continuous casting, heating, The production processes such as hot rolling and normalizing.The characteristics of its Sub realizable fuzzy matrix, determines to be easy to form { 100 } texture in its Cast Strip, how to utilize Its texture is the key that prepare cubic texture doubly oriented silicon steel based on thin strap continuous casting.
Invention content
For existing cubic texture doubly oriented silicon steel in the above problem present on preparation method, the present invention provides a kind of base In the method that thin strap continuous casting prepares cube doubly oriented silicon steel, based on being formed to texture during twin-roll thin strip continuous casting Sub realizable fuzzy matrix Understanding, reasonable design process is pre-processed by Cast Strip and improves cubic texture intensity, real in final finished annealing process The abnormal growth of existing cubic texture, obtains cubic texture doubly oriented silicon steel.
The technical scheme is that：
A method of cube doubly oriented silicon steel is prepared based on thin strap continuous casting, is carried out according to the following steps：
(1) set component smelting molten steel is pressed, ingredient is by weight percentage：C 0.002~0.005%, Si 1.5~ 3.0%, Mn 0.05~0.2%, Al≤0.005%, P≤0.008%, S 0.005~0.01%, N≤0.002%, O≤ 0.002%, surplus is Fe and inevitable impurity；
(2) strip casting process：Molten steel is entered into tundish by cast gate, 1200~1250 DEG C of tundish preheating temperature, It is 30~60 DEG C to control the degree of superheat, and molten steel, which is entered by tundish after strip casting machine, forms Cast Strip, 40~60m/ of control teeming speed Min controls molten metal pool level 100~150mm of height, controls Cast Strip 1.5~2.5mm of thickness；
(3) Cast Strip naturally cools to hot-rolling mill under inert atmosphere conditions after going out roller, and 950~1000 DEG C of hot-rolled temperature is whole 900~950 DEG C of temperature is rolled, drafts 2~5% batches after hot rolling；
(4) Al will be applied after hot rolling band pickling2O3It is batched again after interleaving agent, Al2O3Interleaving agent granularity is 10~20 μm；
(5) hot rolling progress bell furnace is heat-treated, and is less than -30 DEG C of pure H in dew point2Under conditions of circulation, first with 50~ The speed of 150 DEG C/h is warming up to 900~1050 DEG C, and 5~20h of heat preservation carries out pretreatment annealing；
(6) it is carried out after hot rolling being cleaned up interleaving agent, single phase multi-pass cold rolling, overall reduction is 70~86%, is obtained Cold-rolled strip is rolled up；
(7) cold-rolled strip carries out to recrystallization annealing at 850~900 DEG C, the time is 120~180s, and when recrystallization annealing is cold Rolling band is carried out under the conditions of pure hydrogen, is controlled the dew point of atmosphere at -30 DEG C and is moved back hereinafter, carrying out high temperature after being then coated with interleaving agent Fire is first warming up to 980~1200 DEG C with the speed of 50~150 DEG C/h, and 10~20h of heat preservation anneals, and obtains cube double orientation Silicon steel finished product.
Cube doubly oriented silicon steel final thickness is 0.20~0.50mm.
In the step (5), Cast Strip is obtained after Overheating Treatment with 10~15mm of diameter and { 100 };0vw>It is orientated Chip area score be higher than 60%.
In the step (7), cube doubly oriented silicon steel cold rolled annealed plate has unified { 100 };001>Orientation texture, 5~12mm of subgrain size.
Cube doubly oriented silicon steel finished product magnetic property is：Along roll to lateral iron loss P17/50For 0.75~1.2W/kg, Roll to lateral magnetic strength B8For 1.86T or more.
In the step (6), the draught per pass of single phase multi-pass cold rolling is 10%~20%.
The technical principle of the present invention is as follows：
The present invention is based on strip continuous casting technologies, make full use of in non-orientation silicon steel Cast Strip the advantage function of { 100 } texture.Casting Band carries out long heat treatment after hot-leveling, is less than -30 DEG C of pure H in dew point2Under conditions of circulation, surface energy and crystallite dimension Under the collective effect of advantage, { 100 } <0vw>It is orientated abnormal grain growth, obtains coarse strong { 100 } the texture initial group of tissue It knits.Finished products use two benches annealing process, cryogenic re-crystallisation to obtain { 100 } &lt using texture hereditation;001>It is orientated brilliant Core, second stage high-temperature annealing process is under pure hydrogen atmosphere, the effect using atmosphere for surface energy, realizes that surface energy induces It cube is orientated and to be abnormal and grow up, realize prepared by the low cost of high-magnetic induction, low-iron loss cube doubly oriented silicon steel.
Compared with prior art, advantages of the present invention and advantageous effect are：
1, the present invention combines the texture of thin strap continuous casting Sub realizable fuzzy matrix, by Cast Strip in pure H2Under the conditions of at Long Time Thermal Reason, obtaining has 10~15mm of diameter and prosperity { 100 } <0vw>The initial structure of the crystalline form of orientation partly utilizes its something lost Biography acts on, and flourishing { 100 } &lt are obtained for finished products;001>Orientation texture provides basis.
2, finished products of the present invention use two benches annealing process, first stage annealing process to complete { 100 } crystal grain and reply And Recrystallization nucleation, while crystal grain being inhibited to grow up, secondary stage annealing process is obtained using the selection index system of its surface energy {100}<001>The production board of texture abnormal growth, finished products plate significantly improve isotropism, along roll to lateral iron loss P17/50For 0.75~1.2W/kg, roll to lateral magnetic strength B8For 1.88T or more.
3, the present invention not fully depends on texture hereditation due to using rolling-two benches heat treatment process, so Finished products plate thickness is unrestricted, can prepare thickness be 0.20~0.50mm doubly oriented silicon steels, break through Thin Specs it is low respectively to The technology of preparing bottleneck problem of anisotropic high-magnetic induction, low-iron loss silicon steel plate.
4, present invention process flow simple possible is, it can be achieved that continuous batch production, meets industrialization production requirements, finished product Magnetic property is excellent.
Description of the drawings
Fig. 1 is the preparation method flow diagram of cube doubly oriented silicon steel of the present invention；
Fig. 2 is the primary recrystallization microscopic structure in the embodiment of the present invention 3；
Fig. 3 is the production board marcotexture figure in the embodiment of the present invention 3.
Specific implementation mode
In specific implementation process, the strip casting machine used is strip disclosed in patent (publication number CN103551532A) Conticaster.As shown in Figure 1, the method flow for preparing cube doubly oriented silicon steel based on thin strap continuous casting is as follows：Pass through ladle smelting steel Water pours into tundish, and strip casting machine is flowed by cloth flowing water mouth, copper crystallization roll and the side seal board composition rotated at two Molten bath is formed in crystallizer, and Cast Strip is formed after molten steel solidification；It is batched after a time hot rolling；Hot-rolled strip applies after pickling Interleaving agent is heat-treated, and is then cleared up interleaving agent and is carried out cold rolling, and progress two benches recrystallization is moved back after obtaining target thickness strip Fire, annealing plate surface apply insulating coating and dry, and obtain a cube doubly oriented silicon steel finished product.
Microscopic structure is observed in the embodiment of the present invention and uses 55 type scanning electron microscope of Zeiss Ultra, in the embodiment of the present invention The hydrogen volume purity used is 99.9%.
In the following, being further elaborated on to the present invention by embodiment.
Embodiment 1
In the present embodiment, based on the method that thin strap continuous casting prepares cube doubly oriented silicon steel, carry out according to the following steps：
By set component smelting molten steel, ingredient is by weight percentage：C 0.002%, Si 1.5%, Mn 0.05%, Al 0.0044%, P 0.0072%, S 0.005%, N 0.0016%, O 0.0013%, surplus Fe；
Strip casting process：Molten steel is entered into tundish by cast gate, 1200 DEG C of tundish preheating temperature controls the degree of superheat It it is 60 DEG C, molten steel, which is entered by tundish after strip casting machine, forms Cast Strip, controls teeming speed 50m/min, and control molten metal pool level is high 130mm is spent, Cast Strip thickness 1.5mm is controlled；
Cast Strip naturally cools to hot-rolling mill, 980 DEG C of hot-rolled temperature, finishing temperature 930 under inert atmosphere conditions after going out roller DEG C, drafts 4% batches after hot rolling.
Al will be applied after hot rolling band pickling2O3It is batched again after interleaving agent, Al2O3Interleaving agent granularity is 15 μm；
Hot rolling carries out bell furnace and is heat-treated, and is less than -30 DEG C of pure H in dew point2Under conditions of circulation, first with 100 DEG C/h Speed be warming up to 950 DEG C, heat preservation 12h carries out pretreatment annealing；Cast Strip obtains after Overheating Treatment has 10~15mm of diameter { 100 } <0vw>Orientation texture area fraction is 70%.
It is carried out after hot rolling is cleaned up interleaving agent, single phase multi-pass cold rolling, overall reduction 86%, draught per pass It is 12~15%, obtains 0.2mm thickness cold-rolled strips volume；
Cold-rolled strip is subjected to recrystallization annealing at 900 DEG C, the time is 120~180s, when recrystallization annealing cold-rolled strip be It is carried out under the conditions of pure hydrogen, controls the dew point of atmosphere at -30 DEG C hereinafter, being then coated with the interleaving agent (Al that granularity is 15 μm2O3) After carry out high annealing, be first warming up to 980 DEG C with the speed of 100 DEG C/h, heat preservation 20h anneals.Cube doubly oriented silicon steel is cold Rolling annealed sheet has unified { 100 } <001>Orientation texture, 5~12mm of subgrain size.Cube doubly oriented silicon steel finished product magnetic Performance is：Along roll to lateral iron loss P17/50For 0.8~1.2W/kg, roll to lateral magnetic strength B8For 1.86T or more.
Embodiment 2
In the present embodiment, based on the method that thin strap continuous casting prepares cube doubly oriented silicon steel, carry out according to the following steps：
By set component smelting molten steel, ingredient is by weight percentage：C 0.005%, Si 3.0%, Mn 0.2%, Al 0.0030%, P 0.0058%, S 0.01%, N 0.0015%, O 0.0014%, surplus Fe；
Strip casting process：Molten steel is entered into tundish by cast gate, 1250 DEG C of tundish preheating temperature controls the degree of superheat It it is 50 DEG C, molten steel, which is entered by tundish after strip casting machine, forms Cast Strip, controls teeming speed 40m/min, and control molten metal pool level is high 120mm is spent, Cast Strip thickness 1.5mm is controlled；
Cast Strip naturally cools to hot-rolling mill, 960 DEG C of hot-rolled temperature, finishing temperature 920 under inert atmosphere conditions after going out roller DEG C, drafts 3% batches after hot rolling.
Al will be applied after hot rolling band pickling2O3It is batched again after interleaving agent, Al2O3Interleaving agent granularity is 12 μm；
Hot rolling carries out bell furnace and is heat-treated, and is less than -30 DEG C of pure H in dew point2Under conditions of circulation, first with 50 DEG C/h's Speed is warming up to 1050 DEG C, and heat preservation 5h carries out pretreatment annealing；Cast Strip obtain after Overheating Treatment with 10~15mm of diameter and {100}<0vw>The chip area score of orientation is 65%.
It is carried out after hot rolling is cleaned up interleaving agent, single phase multi-pass cold rolling, overall reduction 86%, draught per pass It is 10~12%, obtains 0.2mm thickness cold-rolled strips volume；
Cold-rolled strip is subjected to recrystallization annealing at 850 DEG C, the time is 120~180s, when recrystallization annealing cold-rolled strip be It is carried out under the conditions of pure hydrogen, controls the dew point of atmosphere at -30 DEG C hereinafter, being then coated with the interleaving agent (Al that granularity is 12 μm2O3) After carry out high annealing, be first warming up to 1200 DEG C with the speed of 120 DEG C/h, heat preservation 10h anneals.Cube doubly oriented silicon steel is cold Rolling annealed sheet has unified { 100 } <001>Orientation texture, 5~12mm of subgrain size.Cube doubly oriented silicon steel finished product magnetic Performance is：Along roll to lateral iron loss P17/50For 0.75~1.1W/kg, roll to lateral magnetic strength B8For 1.86T or more.
Embodiment 3
In the present embodiment, based on the method that thin strap continuous casting prepares cube doubly oriented silicon steel, carry out according to the following steps：
By set component smelting molten steel, ingredient is by weight percentage：C 0.002%, Si 2.0%, Mn 0.2%, Al 0.0030%, P 0.0062%, S 0.008%, N 0.0015%, O 0.0012%, surplus Fe；
Strip casting process：Molten steel is entered into tundish by cast gate, 1220 DEG C of tundish preheating temperature controls the degree of superheat It it is 40 DEG C, molten steel, which is entered by tundish after strip casting machine, forms Cast Strip, controls teeming speed 60m/min, and control molten metal pool level is high 140mm is spent, Cast Strip thickness 2.5mm is controlled；
Cast Strip naturally cools to hot-rolling mill, 970 DEG C of hot-rolled temperature, finishing temperature 910 under inert atmosphere conditions after going out roller DEG C, drafts 5% batches after hot rolling.
Al will be applied after hot rolling band pickling2O3It is batched again after interleaving agent, Al2O3Interleaving agent granularity is 18 μm；
Hot rolling carries out bell furnace and is heat-treated, and is less than -30 DEG C of pure H in dew point2Under conditions of circulation, first with 120 DEG C/h Speed be warming up to 900 DEG C, heat preservation 10h carries out pretreatment annealing；Cast Strip obtains after Overheating Treatment has 10~15mm of diameter { 100 } <0vw>The chip area score of orientation is 60%.
It is carried out after hot rolling is cleaned up interleaving agent, single phase multi-pass cold rolling, overall reduction 80%, draught per pass It is 15~18%, obtains 0.5mm thickness cold-rolled strips volume；
Cold-rolled strip is subjected to recrystallization annealing at 850 DEG C, the time is 120~180s, when recrystallization annealing cold-rolled strip be It is carried out under the conditions of pure hydrogen, controls the dew point of atmosphere at -30 DEG C hereinafter, being then coated with the interleaving agent (Al that granularity is 18 μm2O3) After carry out high annealing, be first warming up to 1100 DEG C with the speed of 80 DEG C/h, heat preservation 20h anneals.Cube doubly oriented silicon steel is cold Rolling annealed sheet has unified { 100 } <001>Orientation texture, 5~12mm of subgrain size.Cube doubly oriented silicon steel finished product magnetic Performance is：Along roll to lateral iron loss P17/50For 0.9~1.2W/kg, roll to lateral magnetic strength B8For 1.86T or more.
As shown in Fig. 2, can be seen that cold-reduced sheet from primary recrystallization microscopic structure completes recrystallization process, part is special It is orientated crystal grain and forms certain size advantage, matrix grain fine uniform.
As shown in figure 3, foring unified and flourishing cube after can be seen that high annealing from production board marcotexture figure Texture, intensity are up to 56.
Embodiment 4
In the present embodiment, based on the method that thin strap continuous casting prepares cube doubly oriented silicon steel, carry out according to the following steps：
By set component smelting molten steel, ingredient is by weight percentage：C 0.002%, Si 2.5%, Mn 0.2%, Al 0.0033%, P 0.0048%, S 0.01%, N 0.0017%, O 0.0012%, surplus Fe；
Strip casting process：Molten steel is entered into tundish by cast gate, 1230 DEG C of tundish preheating temperature controls the degree of superheat It it is 60 DEG C, molten steel, which is entered by tundish after strip casting machine, forms Cast Strip, controls teeming speed 45m/min, and control molten metal pool level is high 110mm is spent, Cast Strip thickness 1.7mm is controlled；
Cast Strip naturally cools to hot-rolling mill, 990 DEG C of hot-rolled temperature, finishing temperature 940 under inert atmosphere conditions after going out roller DEG C, drafts 2% batches after hot rolling.
Al will be applied after hot rolling band pickling2O3It is batched again after interleaving agent, Al2O3Interleaving agent granularity is 16 μm；
Hot rolling carries out bell furnace and is heat-treated, and is less than -30 DEG C of pure H in dew point2Under conditions of circulation, first with 100 DEG C/h Speed be warming up to 950 DEG C, heat preservation 15h carries out pretreatment annealing；Cast Strip obtains after Overheating Treatment has 10~15mm of diameter { 100 } <0vw>The area fraction of orientation is 68%.
It is carried out after hot rolling is cleaned up interleaving agent, single phase multi-pass cold rolling, overall reduction 70%, draught per pass It is 12~15%, obtains 0.5mm thickness cold-rolled strips volume；
Cold-rolled strip is subjected to recrystallization annealing at 850 DEG C, the time is 120~180s, when recrystallization annealing cold-rolled strip be It is carried out under the conditions of pure hydrogen, controls the dew point of atmosphere at -30 DEG C hereinafter, being then coated with the interleaving agent (Al that granularity is 16 μm2O3) After carry out high annealing, be first warming up to 1200 DEG C with the speed of 150 DEG C/h, heat preservation 10h anneals.Cube doubly oriented silicon steel is cold Rolling annealed sheet has unified { 100 } <001>Orientation texture, 5~12mm of subgrain size.Cube doubly oriented silicon steel finished product magnetic Performance is：Along roll to lateral iron loss P17/50For 1.0~1.2W/kg, roll to lateral magnetic strength B8For 1.86T or more.
Embodiment the result shows that, the present invention is pre-processed by Cast Strip, enhance initial structure in { 100 } texture intensity, be based on Cold rolling-two benches annealing process system obtains { 100 } <001>The doubly oriented silicon steel of texture abnormal grain growth.Along roll to and it is horizontal To iron loss P17/50For 0.75~1.2W/kg, roll to lateral magnetic strength B8For 1.86T or more.

Claims (4)

1. a kind of method preparing cube doubly oriented silicon steel based on thin strap continuous casting, which is characterized in that carry out according to the following steps：
（1）By set component smelting molten steel, ingredient is by weight percentage：C 0.002 ~ 0.005%, Si 1.5 ~ 3.0 %, Mn 0.05 ~ 0.2%, Al≤0.005%, P≤0.008%, S 0.005 ~ 0.01%, N≤0.002%, O≤0.002%, surplus be Fe and Inevitable impurity；
（2）Strip casting process：Molten steel is entered into tundish by cast gate, 1200 ~ 1250 DEG C of tundish preheating temperature controlled Temperature is 30 ~ 60 DEG C, and molten steel, which is entered by tundish after strip casting machine, forms Cast Strip, controls 40 ~ 60m/min of teeming speed, control Molten metal pool level 100 ~ 150mm of height controls Cast Strip 1.5 ~ 2.5mm of thickness；
（3）Cast Strip naturally cools to hot-rolling mill, 950 ~ 1000 DEG C of hot-rolled temperature, finishing temperature under inert atmosphere conditions after going out roller 900 ~ 950 DEG C, drafts 2 ~ 5% batches after hot rolling；
（4）Al will be applied after hot rolling band pickling2O3It is batched again after interleaving agent, Al2O3Interleaving agent granularity is 10 ~ 20 μm；
（5）Hot rolling carries out bell furnace and is heat-treated, and is less than -30 DEG C of pure H in dew point2Under conditions of circulation, first with 50 ~ 150 DEG C/h Speed be warming up to 900 ~ 1050 DEG C, 5 ~ 20h of heat preservation carries out pretreatment annealing；
The step（5）In, Cast Strip is obtained after Overheating Treatment with 10 ~ 15mm of diameter and { 100 };0vw>The crystal grain of orientation Area fraction is higher than 60%；
（6）It is carried out after hot rolling is cleaned up interleaving agent, single phase multi-pass cold rolling, overall reduction is 70 ~ 86%, obtains cold-rolled strip Volume；
（7）Cold-rolled strip is subjected to recrystallization annealing at 850 ~ 900 DEG C, the time is 120 ~ 180s, and cold-rolled strip is when recrystallization annealing It is carried out under the conditions of pure hydrogen, controls the dew point of atmosphere at -30 DEG C hereinafter, carrying out high annealing after being then coated with interleaving agent, first 980 ~ 1200 DEG C are warming up to the speed of 50 ~ 150 DEG C/h, 10 ~ 20h of heat preservation anneals, and obtains cube doubly oriented silicon steel finished product；
Cube doubly oriented silicon steel finished product magnetic property is：Along roll to lateral iron loss P17/50For 0.75 ~ 1.2W/kg, roll to With lateral magnetic strength B8For 1.86 T or more.
2. the method according to claim 1 for preparing cube doubly oriented silicon steel based on thin strap continuous casting, which is characterized in that described Cube doubly oriented silicon steel final thickness be 0.20 ~ 0.50mm.
3. the method according to claim 1 for preparing cube doubly oriented silicon steel based on thin strap continuous casting, which is characterized in that described The step of（7）In, cube doubly oriented silicon steel cold rolled annealed plate has unified { 100 } <001>Orientation texture, subgrain size 5~12mm。
4. the method according to claim 1 for preparing cube doubly oriented silicon steel based on thin strap continuous casting, which is characterized in that described The step of（6）In, the draught per pass of single phase multi-pass cold rolling is 10% ~ 20%.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6322635B1 (en) * 1998-10-27 2001-11-27 Kawasaki Steel Corporation Electromagnetic steel sheet and process for producing the same
CN105018847A (en) * 2015-07-15 2015-11-04 东北大学 Extremely-thin oriented silicon steel plate based on two-roll thin-strip continuous casting and manufacturing method of extremely-thin oriented silicon steel plate

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6322635B1 (en) * 1998-10-27 2001-11-27 Kawasaki Steel Corporation Electromagnetic steel sheet and process for producing the same
CN105018847A (en) * 2015-07-15 2015-11-04 东北大学 Extremely-thin oriented silicon steel plate based on two-roll thin-strip continuous casting and manufacturing method of extremely-thin oriented silicon steel plate

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