CN107058867B - A kind of energy saving transformer iron core high Si pure iron and its production method - Google Patents

A kind of energy saving transformer iron core high Si pure iron and its production method Download PDF

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CN107058867B
CN107058867B CN201710192451.3A CN201710192451A CN107058867B CN 107058867 B CN107058867 B CN 107058867B CN 201710192451 A CN201710192451 A CN 201710192451A CN 107058867 B CN107058867 B CN 107058867B
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slag
production method
energy saving
furnace
iron core
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CN107058867A (en
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戴永刚
乔国军
刘宏伟
田新中
张治广
刘振民
洪雷
姬旦旦
郭明仪
田景广
许克天
李宝秀
宋云霞
吴治远
王秋坤
刘会杰
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Xingtai Iron and Steel Co Ltd
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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%
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium

Abstract

The present invention provides a kind of energy saving transformer iron core high Si pure iron and its production method, the chemical component and mass percentage of the high Si pure iron are as follows：C≤0.006%, Si：1.80~2.20%, Mn≤0.060%, P≤0.010%, S：0.006%, Alt≤0.004%, Ti≤0.003%, O≤0.006%, N≤0.005%, Ni≤0.020%, Cr≤0.030%, Cu≤0.020%, remaining is Fe and inevitable impurity, and production method includes molten iron pretreatment, converter smelting, the refining of LF furnace, RH furnace decarburized alloy, continuous casting working procedure.Production method of the invention avoids user's later period melting and metallic silicon is added, and reduces more impurity elements and enters in steel, improves the electromagnetic performance of energy saving transformer iron core, meets demand of the user to cost reduction, increased quality.

Description

A kind of energy saving transformer iron core high Si pure iron and its production method
Technical field
The invention belongs to iron and steel smelting technology fields, and in particular to a kind of high Si pure iron of energy saving transformer iron core and its Production method.
Background technique
Energy saving transformer belongs to the energy-saving product of substitution silicon steel transformer purposes, main group as transformer of iron core At one of part, can the quality of performance will directly influence transformer and run to economic and reliable.Magnetic induction intensity height, iron loss Low is its important characteristic, and magnetic induction intensity represents the magnetizability of material, and the magnetic induction intensity of iron core is higher, excitation current （That is no-load current）Lower, copper loss and iron loss all reduce, and can save electric energy.The magnetostriction of high magnetic strength iron core is low simultaneously, can be with The noise for substantially reducing transformer, reduces environmental pollution.
It needs in the iron core production of general transformer using pure iron as raw material.Turn to guarantee the performance of transformer, improving electric power Efficiency is changed, downstream producer proposes higher requirement to pure iron as raw material ingredient, and S, P element will be lacked, and oxygen element is low, and field trash will wait less Deng.And silicon is added, the resistivity and maximum permeability of iron can be improved, reduce coercivity, core loss（Iron loss）And magnetic aging, because In this subsequent smelting process, need to continuously add a large amount of Si element in pure iron as raw material, but can bring to the iron core of high Si miscellaneous The problem of prime element increases.
Therefore need domestic steel mill exploitation new material and meet its needs, we according to the needs of users, to subsequent user Smelting technology analyzed, and from ingredient, Control and Inclusion Removal, technique process cooperation etc. to steel grade production set Meter optimization.Pure iron steel grade technique generally uses converter-RH furnace-continuous casting technique, and Xing Gang reasonably organizes weaver according to existing equipment Skill route, using converter-LF furnace-RH furnace-continuous casting blooms process route, the high Si pure iron as raw material bloom of exploitation is kept away Exempt from user's too many Si element of subsequent addition and electromagnetic performance is caused to decline, meets the requirement of down-stream enterprise.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of energy saving transformer iron core high Si pure iron and its producer Method, this method produce the high Si pure iron of Ultra-low carbon, meet the needs of user is to energy saving transformer iron core melting impurity content is reduced.
In order to solve the above technical problems, the present invention provides a kind of energy saving transformer iron core high Si pure iron, the high Si The chemical component and mass percentage of pure iron are as follows：C≤0.006%, Si：1.80~2.20%, Mn≤0.060%, P≤ 0.010%, S：0.006%, Alt≤0.004%, Ti≤0.003%, O≤0.006%, N≤0.005%, Ni≤0.020%, Cr≤ 0.030%, Cu≤0.020%, remaining is Fe and inevitable impurity.
A kind of production method the present invention also provides above-mentioned energy saving transformer iron core with high Si pure iron, the production method Including molten iron pretreatment, converter smelting, the refining of LF furnace, RH furnace decarburized alloy, continuous casting working procedure；The continuous casting working procedure, continuous casting are big Square billet chemical component and weight percentage are：C≤0.006%, Si：1.80~2.20%, Mn≤0.060%, P≤0.010%, S： 0.006%, Alt≤0.004%, Ti≤0.003%, O≤0.006%, N≤0.005%, Ni≤0.020%, Cr≤0.030%, Cu≤ 0.020%, remaining is Fe and inevitable impurity.
Hot metal pre process procedures of the present invention, pretreatment desulfurizing control S≤0.006% in molten steel.
Converter smelting process of the present invention, converter smelting early period use the technique of falling slag, outwell the oxidizing slag containing high P, Mn； Later period draws technique of re-blowing using high, controls molten steel C≤0.06%, liquid steel temperature≤1620 DEG C.
Converter smelting process of the present invention, tapping use slide plate pushing off the slag, control the lower quantity of slag, tapping Control for Oxygen Content≤ 800ppm carries out pre-deoxidation using aluminium block, and aluminium block additional amount is 0.5-1.0kg/ tons of steel.
LF furnace refining procedure of the present invention, Oxygen Content in Liquid Steel≤500ppm after control is entered the station, is warming up to 1640~1660 DEG C, ladle bottom uses argon gas strong mixing.
LF furnace refining procedure of the present invention, heating, which finishes, determine oxygen operation, closes Ladle Bottom and blows, adds on the top of the slag Enter refining ladle slag modifier+aluminum shot and carry out top slag restructuring operation, after reaction, dips in slag specimen observation clinker color, the green glass of finishing slag Glass slag or Transparent color, FeO≤5.0% in slag；The chemical component and mass percentage of refining ladle slag modifier be：CaO：20 ~28%, Al2O3：23~30%, SiO2：2~8%, S：0~0.15%, P：0~0.05%, Al：37~43%.
RH furnace decarburized alloy chemical industry sequence of the present invention, LF furnace tapping molten steel is transported to RH furnace and carries out Decarburization Operation, after entering the station Determine oxygen；Decarburization is carried out using OB technique, OB is vacuum-treated after starting using full pumping, vacuum degree control≤100pa；OB terminates Afterwards, decarburization circulation time >=8min is controlled, determines oxygen after decarburization.
RH furnace decarburized alloy chemical industry sequence of the present invention after decarburization, is added micro- ferro-silicon-aluminium and carries out deoxidation alloying, add Entering amount is 30kg/ tons, and molten steel dissolved oxygen content control≤30ppm, circulation 3-5min is pressed again, keeps soft blow 4-6min.
Continuous casting working procedure of the present invention, after molten steel RH is leaving from station, upper conticaster is cast into 325mm × 280mm bloom, big to wrap It is protected using long nozzle, crystallizer carries out whole process protection casting using submersed nozzle, and tundish temperature is controlled in 1540-1560 DEG C, pulling rate 0.7m/min, stopper argon blowing rate is in 50~80NL/h.
Mentality of designing of the invention：
1. metallic silicon is added in order to save user in later period fusion process, avoids more impurity elements and enter steel In, the electromagnetic performance of energy saving transformer iron core is improved, the present invention increases Si content in pure iron as raw material steel, and si content can Reach 1.80-2.20%, achievees the purpose that cost reduction, the increased quality of down-stream enterprise's production energy saving transformer iron core.
2. using molten iron pretreatment to reduce in steel impurity element, slag, slide plate pushing off the slag, molten steel final deoxidizing are fallen in converter Using micro- ferro-silicon-aluminium, the technological measures such as dissolved oxygen in higher steel, it is therefore an objective to it is pure to produce pure high Si using above-mentioned technique Iron square billet meets the needs of user reduces energy saving transformer iron core melting impurity content.
3. a large amount of micro- ferro-silicon-aluminium is added in the RH furnace later period, Alloying Treatment is carried out, has obtained the molten steel of high Si, simultaneously Other elements do not change significantly.
4. carrying out continuous casting using the technique of half boiling steel containing oxygen more than needed in molten steel, thus to reduce Al element in steel The restructuring of top slag has been carried out in LF, RH, has avoided wadding stream and bubble phenomenon that square billet casting with oxygen molten steel generates.
5. in order to guarantee the extremely low level of Al, Ti element in steel, therefore using incomplete deoxidation mode, deposited in steel It is being partly dissolved oxygen, is balancing steel grade Al, Ti content, while using micro- aluminium silicon containing Al, Ti during molten steel final deoxidizing Iron avoids the raising of Al, Ti content in steel.
Generated beneficial effect is by adopting the above technical scheme：1, the present invention provides energy saving transformer iron core use The production method of high Si pure iron is obtained using molten iron pretreatment desulfurizing, converter decarburization, LF desulfurization heating, the decarburization of RH depth and alloying It is extremely low carbon content is arrived, the elements such as S, P, Al, Ti, O, C, Mn are in lower content range, and the higher pure iron of Si ingredient produces Product.2, it avoids user's later period melting and metallic silicon is added, reduce more impurity elements and enter in steel, improve energy-saving change The electromagnetic performance of depressor iron core meets demand of the user to cost reduction, increased quality.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
High Si pure iron chemical component and weight percentage are：C：0.006%, Si：2.20%, Mn：0.060%, P： 0.010%, S：0.006%, Alt：0.004%, Ti：0.003%, O：0.006%, N：0.005%, Ni：0.020%, Cr：0.030%, Cu：0.020%, remaining is Fe and inevitable impurity.
The production method of the high Si pure iron square billet of the present embodiment includes molten iron pretreatment, converter smelting, LF furnace refines, RH furnace takes off Carbon alloy, continuous casting working procedure, specific step is as follows：
1）Molten iron pretreatment：Molten iron pretreatment desulfurizing enters furnace molten iron S：0.006%.
2）Converter smelting：80 tons of converter heat size, the technique of falling slag is used in converter smelting early period, pours out 1/2 after slag chargeization is good Slag continues to smelt；Later period draws technique of re-blowing using high, and molten steel tapping uses slide plate pushing off the slag, controls the lower quantity of slag, Oxygen Content in Liquid Steel 800ppm, aluminium block 0.5kg/ tons of steel progress pre-deoxidation of addition, 1620 DEG C of molten steel tapping temperature, terminal ingredient：C：0.060%, Si： 0.002%, Mn：0.04%, S：0.006%, P：0.009%.
3）The refining of LF furnace：After LF enters the station, Oxygen Content in Liquid Steel 500ppm is warming up to 1660 DEG C, and ladle bottom is strong using argon gas Stirring；Heating finish determine oxygen operation, and close Ladle Bottom blow, to the top of the slag be sprinkled into refining ladle slag modifier+aluminum shot into The slag restructuring operation of row top, after reaction, dipping in slag specimen finishing slag is green glass slag, and FeO is 5.0% in slag.Refining ladle slag modifier Chemical component and mass percentage are：CaO：28%, Al2O3：30%, SiO2：8%, S：0.15%, P：0.05%, Al：43%.
4）RH decarburized alloy：The tapping molten steel of LF furnace is transported to RH furnace and carries out Decarburization Operation, determines oxygen after entering the station；Using OB work Skill carries out decarburization, and OB is vacuum-treated after starting using full pumping, vacuum degree control 100pa；After OB, decarburization circulation time 8min, decarburization terminate to determine oxygen；After decarburization, the micro- ferro-silicon-aluminium of 2400kg is added and carries out deoxidation alloying, measures molten steel dissolved oxygen 30ppm；It is pressed again after circulation 3min, soft blow time 5min.
5) continuous casting：After molten steel RH is leaving from station, upper large square bland continuous-casting machine is cast into 325mm × 280mm bloom, and big packet is using length Mouth of a river protection, crystallizer carry out whole process protection casting using submersed nozzle, 1560 DEG C of tundish temperature, pulling rate 0.7m/min, fill in Stick argon blowing rate obtains continuous casting blooms in 80NL/h；Continuous casting blooms chemical component and weight percentage are：C：0.006%, Si：2.20%, Mn：0.060%, P：0.010%, S：0.006%, Alt：0.004%, Ti：0.003%, O：0.006%, N：0.005%, Ni：0.020%, Cr：0.030%, Cu：0.020%, remaining is Fe and inevitable impurity.
Embodiment 2
High Si pure iron chemical component and weight percentage are：C：0.005%, Si：1.80%, Mn：0.050%, P： 0.008%, S：0.005%, Alt：0.003%, Ti：0.003%, O：0.005%, N：0.004%, Ni：0.015%, Cr：0.018%, Cu：0.017%, remaining is Fe and inevitable impurity.
The production method of the high Si pure iron square billet of the present embodiment includes molten iron pretreatment, converter smelting, LF furnace refines, RH furnace takes off Carbon alloy, continuous casting working procedure, specific step is as follows：
1）Molten iron pretreatment：Molten iron pretreatment desulfurizing enters furnace molten iron S：0.005%.
2）Converter smelting：80 tons of converter heat size, the technique of falling slag is used in converter smelting early period, pours out 1/2 after slag chargeization is good Slag continues to smelt；Later period draws technique of re-blowing using high, and molten steel tapping uses slide plate pushing off the slag, controls the lower quantity of slag, Oxygen Content in Liquid Steel 700ppm, aluminium block 0.6kg/ tons of steel progress pre-deoxidation of addition, 1618 DEG C of molten steel tapping temperature, terminal ingredient：C：0.045%, Si： 0.003%, Mn：0.05%, S：0.005%, P：0.008%.
3）The refining of LF furnace：After LF enters the station, Oxygen Content in Liquid Steel 450ppm is warming up to 1640 DEG C, and ladle bottom is strong using argon gas Stirring；Heating finish determine oxygen operation, and close Ladle Bottom blow, to the top of the slag be sprinkled into refining ladle slag modifier+aluminum shot into The slag restructuring operation of row top, after reaction, dipping in slag specimen finishing slag is green glass slag, and FeO is 4.0% in slag.Refining ladle slag modifier Chemical component and mass percentage are：CaO：20%, Al2O3：23%, SiO2：2%, S：0%, P：0%, Al：37%.
4）RH decarburized alloy：The tapping molten steel of LF furnace is transported to RH furnace and carries out Decarburization Operation, determines oxygen after entering the station；Using OB work Skill carries out decarburization, and OB is vacuum-treated after starting using full pumping, vacuum degree control 90pa；After OB, decarburization circulation time 10min, decarburization terminate to determine oxygen；After decarburization, the micro- ferro-silicon-aluminium of 2400kg is added and carries out deoxidation alloying, measures molten steel dissolved oxygen 25ppm；It is pressed again after circulation 5min, soft blow time 6min.
5) continuous casting：After molten steel RH is leaving from station, upper large square bland continuous-casting machine is cast into 325mm × 280mm bloom, and big packet is using length Mouth of a river protection, crystallizer carry out whole process protection casting using submersed nozzle, 1540 DEG C of tundish temperature, pulling rate 0.7m/min, fill in Stick argon blowing rate obtains continuous casting blooms in 50NL/h；Continuous casting blooms chemical component and weight percentage are：C：0.005%, Si：1.80%, Mn：0.050%, P：0.008%, S：0.005%, Alt：0.003%, Ti：0.003%, O：0.005%, N：0.004%, Ni：0.015%, Cr：0.018%, Cu：0.017%, remaining is Fe and inevitable impurity.
Embodiment 3
High Si pure iron chemical component and weight percentage are：C：0.004%, Si：2.00%, Mn：0.035%, P： 0.008%, S：0.005%, Alt：0.003%, Ti：0.002%, O：0.004%, N：0.004%, Ni：0.010%, Cr：0.015%, Cu：0.010%, remaining is Fe and inevitable impurity.
The production method of the high Si pure iron square billet of the present embodiment includes molten iron pretreatment, converter smelting, LF furnace refines, RH furnace takes off Carbon alloy, continuous casting working procedure, specific step is as follows：
1）Molten iron pretreatment：Molten iron pretreatment desulfurizing enters furnace molten iron S：0.005%.
2）Converter smelting：80 tons of converter heat size, the technique of falling slag is used in converter smelting early period, pours out 1/2 after slag chargeization is good Slag continues to smelt；Later period draws technique of re-blowing using high, and molten steel tapping uses slide plate pushing off the slag, controls the lower quantity of slag, Oxygen Content in Liquid Steel 800ppm, aluminium block 1.0kg/ tons of steel progress pre-deoxidation of addition, 1610 DEG C of molten steel tapping temperature, terminal ingredient：C：0.040%, Si： 0.003%, Mn：0.05%, S：0.005%, P：0.007%.
3）The refining of LF furnace：After LF enters the station, Oxygen Content in Liquid Steel 480ppm is warming up to 1650 DEG C, and ladle bottom is strong using argon gas Stirring；Heating finish determine oxygen operation, and close Ladle Bottom blow, to the top of the slag be sprinkled into refining ladle slag modifier+aluminum shot into The slag restructuring operation of row top, after reaction, dipping in slag specimen finishing slag is green glass slag, and FeO is 2.0% in slag.Refining ladle slag modifier Chemical component and mass percentage are：CaO：23%, Al2O3：25%, SiO2：4%, S：0.07%, P：0.02%, Al：38%.
4）RH decarburized alloy：The tapping molten steel of LF furnace is transported to RH furnace and carries out Decarburization Operation, determines oxygen after entering the station；Using OB work Skill carries out decarburization, and OB is vacuum-treated after starting using full pumping, vacuum degree control 80pa；After OB, decarburization circulation time 11min, decarburization terminate to determine oxygen；After decarburization, the micro- ferro-silicon-aluminium of 2400kg is added and carries out deoxidation alloying, measures molten steel dissolved oxygen 18ppm；It is pressed again after circulation 4min, soft blow time 4min.
5) continuous casting：After molten steel RH is leaving from station, upper large square bland continuous-casting machine is cast into 325mm × 280mm bloom, and big packet is using length Mouth of a river protection, crystallizer carry out whole process protection casting using submersed nozzle, 1550 DEG C of tundish temperature, pulling rate 0.7m/min, fill in Stick argon blowing rate obtains continuous casting blooms in 65NL/h；Continuous casting blooms chemical component and weight percentage are：C：0.004%, Si：2.00%, Mn：0.035%, P：0.008%, S：0.005%, Alt：0.003%, Ti：0.002%, O：0.004%, N：0.004%, Ni：0.010%, Cr：0.015%, Cu：0.010%, remaining is Fe and inevitable impurity.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair It is bright to be described in detail, those skilled in the art should understand that：Still the present invention can be modified or be waited With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention In sharp claimed range.

Claims (9)

1. a kind of high Si pure iron of energy saving transformer iron core, which is characterized in that the chemical component and quality of the high Si pure iron Percentage composition is as follows：C≤0.006%, Si：1.80~2.20%, Mn≤0.060%, P≤0.010%, S：0.006%, Alt≤ 0.004%, Ti≤0.003%, O≤0.006%, N≤0.005%, Ni≤0.020%, Cr≤0.030%, Cu≤0.020%, remaining is Fe and inevitable impurity.
2. based on a kind of production method of the high Si pure iron of energy saving transformer iron core described in claim 1, which is characterized in that The production method includes molten iron pretreatment, converter smelting, the refining of LF furnace, RH furnace decarburized alloy, continuous casting working procedure；The continuous casting Process, continuous casting blooms chemical component and weight percentage are：C≤0.006%, Si：1.80~2.20%, Mn≤0.060%, P ≤ 0.010%, S：0.006%, Alt≤0.004%, Ti≤0.003%, O≤0.006%, N≤0.005%, Ni≤0.020%, Cr≤ 0.030%, Cu≤0.020%, remaining is Fe and inevitable impurity；
The RH furnace decarburized alloy chemical industry sequence after decarburization, is added micro- ferro-silicon-aluminium and carries out deoxidation alloying, additional amount is 30kg/ tons, molten steel dissolved oxygen content control≤30ppm, circulation 3-5min is pressed again, keeps soft blow 4-6min.
3. a kind of production method of the high Si pure iron of energy saving transformer iron core according to claim 2, which is characterized in that The hot metal pre process procedures, pretreatment desulfurizing control S≤0.006% in molten steel.
4. a kind of production method of the high Si pure iron of energy saving transformer iron core according to claim 2 or 3, feature exist In the converter smelting process, converter smelting early period uses the technique of falling slag, outwells the oxidizing slag containing high P, Mn；Later period is using high Drawing is re-blow technique, and molten steel C≤0.06%, liquid steel temperature≤1620 DEG C are controlled.
5. a kind of production method of the high Si pure iron of energy saving transformer iron core according to claim 2 or 3, feature exist In the converter smelting process, tapping uses slide plate pushing off the slag, controls the lower quantity of slag, and tapping Control for Oxygen Content is used in≤800ppm Aluminium block carries out pre-deoxidation, and aluminium block additional amount is 0.5-1.0kg/ tons of steel.
6. a kind of production method of the high Si pure iron of energy saving transformer iron core according to claim 2 or 3, feature exist In the LF furnace refining procedure, Oxygen Content in Liquid Steel≤500ppm after control is entered the station is warming up to 1640~1660 DEG C, ladle bottom Using argon gas strong mixing.
7. a kind of production method of the high Si pure iron of energy saving transformer iron core according to claim 2 or 3, feature exist In the LF furnace refining procedure, heating, which finishes, determine oxygen operation, closes Ladle Bottom and blows, refining ladle is added on the top of the slag Slag modifier+aluminum shot carries out top slag restructuring operation, after reaction, dips in slag specimen observation clinker color, finishing slag green glass slag or transparent Color, FeO≤5.0% in slag；The main chemical compositions and mass percentage of refining ladle slag modifier are：CaO：20~28%, Al2O3：23~30%, SiO2：2~8%, S：0~0.15%, P：0~0.05%, Al：37~43%.
8. a kind of production method of the high Si pure iron of energy saving transformer iron core according to claim 2 or 3, feature exist In the RH furnace decarburized alloy chemical industry sequence, LF furnace tapping molten steel is transported to RH furnace and carries out Decarburization Operation, determines oxygen after entering the station；Using OB Technique carries out decarburization, and OB is vacuum-treated after starting using full pumping, vacuum degree control≤100Pa；After OB, decarburization is controlled Circulation time >=8min determines oxygen after decarburization.
9. a kind of production method of the high Si pure iron of energy saving transformer iron core according to claim 2 or 3, feature exist In the continuous casting working procedure, after molten steel RH is leaving from station, upper conticaster is cast into 325mm × 280mm bloom, and big packet uses long nozzle Protection, crystallizer carry out whole process protection casting using submersed nozzle, and tundish temperature control is at 1540-1560 DEG C, pulling rate 0.7m/ Min, stopper argon blowing rate is in 50~80NL/h.
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CN107541580B (en) * 2017-08-25 2019-06-25 武汉钢铁有限公司 The inclusion control method of Hot Rolling Automobile steel is smelted in CSP producing line
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101139681A (en) * 2007-10-26 2008-03-12 山西太钢不锈钢股份有限公司 High grade cold rolling non-oriented silicon steel and method for manufacturing same
CN104726795A (en) * 2013-12-24 2015-06-24 Posco公司 Grain oriented electrical steel sheet and preparation method thereof
CN105018669A (en) * 2015-07-15 2015-11-04 邢台钢铁有限责任公司 Method for producing technically pure iron for nuclear power
CN105579596A (en) * 2013-09-26 2016-05-11 杰富意钢铁株式会社 Method of producing grain oriented electrical steel sheet
CN105779727A (en) * 2014-12-23 2016-07-20 鞍钢股份有限公司 Hot rolling production method for improving electromagnetic performance of non-oriented electrical steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101139681A (en) * 2007-10-26 2008-03-12 山西太钢不锈钢股份有限公司 High grade cold rolling non-oriented silicon steel and method for manufacturing same
CN105579596A (en) * 2013-09-26 2016-05-11 杰富意钢铁株式会社 Method of producing grain oriented electrical steel sheet
CN104726795A (en) * 2013-12-24 2015-06-24 Posco公司 Grain oriented electrical steel sheet and preparation method thereof
CN105779727A (en) * 2014-12-23 2016-07-20 鞍钢股份有限公司 Hot rolling production method for improving electromagnetic performance of non-oriented electrical steel
CN105018669A (en) * 2015-07-15 2015-11-04 邢台钢铁有限责任公司 Method for producing technically pure iron for nuclear power

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