CN106282781B - A kind of method that high intensity non-orientation silicon steel is prepared based on nanometer Cu precipitation strengths - Google Patents

A kind of method that high intensity non-orientation silicon steel is prepared based on nanometer Cu precipitation strengths Download PDF

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CN106282781B
CN106282781B CN201610883383.0A CN201610883383A CN106282781B CN 106282781 B CN106282781 B CN 106282781B CN 201610883383 A CN201610883383 A CN 201610883383A CN 106282781 B CN106282781 B CN 106282781B
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silicon steel
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王郁倩
何禛
张晓明
段军阳
祖国庆
刘曦
曹光明
李成刚
刘振宇
王国栋
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Northeastern University China
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    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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    • C—CHEMISTRY; METALLURGY
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    • 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
    • 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
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing 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

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Abstract

A kind of method that high intensity non-orientation silicon steel is prepared based on nanometer Cu precipitation strengths, is carried out according to the following steps：（1）By set component smelting molten steel, composition contains C 0.002 ~ 0.006%, Si 2.5 ~ 3.5%, Mn 0.2 ~ 0.5%, Cu 0.5 ~ 2%, Alt 0.3 ~ 1.0%, Ni 0.3 ~ 2%, Cr 0.2 ~ 0.5%, S≤0.004%, N≤0.004%, surplus Fe by mass percentage；Cast Strip is obtained through casting；（2）Hot rolling obtains hot-strip；（3）Cold rolling obtains cold-reduced sheet；（4）In 25%H2+75%N2Solution treatment is heated under atmospheric condition, 450 ~ 650 DEG C of progress Ageing Treatments is cooled to, applies insulating layer coating, production board is made.Flow of the present invention is short, process is few, efficiency high, can give full play to a nanometer effect for Cu precipitation strengths, while magnetic property is had little influence on intensity can be made to be greatly improved, properties of product are excellent.

Description

A kind of method that high intensity non-orientation silicon steel is prepared based on nanometer Cu precipitation strengths
Technical field
It is more particularly to a kind of that high intensity No yield point is prepared based on nanometer Cu precipitation strengths the invention belongs to metallurgical technology field The method of silicon steel.
Background technology
Electrical sheet plays the important function that can not be substituted in electric power, electronics and mechanical industry field, is that high magnetic is closed A kind of energy-saving material of yield and dosage maximum in golden collar domain, because its manufacture difficulty is big, Performance Influence Factor is more and is seen as spy " art work " in different steel.
Cold rolling non-oriented electrical steel is mainly used in making the core material of various motors, has good magnetic property and processing Performance.As people are to saving and the attention of environmental protection, motor as power consumption main devices to it is efficient, minimize Direction develop；Frequency converter（PWM）Appearance be even more to make the working method of motor there occurs huge change, VFC to cause Motor working frequency is changed into 10 ~ 1kHz from the 50Hz or 60Hz fixed originally, and motor maximum (top) speed is from original per minute thousands of Turn to bring up to tens of thousands of turns；It is reported that the Calnetix companies in the U.S. have developed the high speed electricity that rotating speed is up to 200,000 r/min Machine；Due to the raising of motor speed, bearing wear is serious, and electric efficiency substantially reduces；This requires used electrical sheet The destruction of centrifugal force is resisted with sufficiently high intensity, is ruptured with preventing rotor when high speed rotates, and iron loss will under high frequency It is low, it is therefore necessary to use high strength electrical steel.At present high strength electrical steel study at home report it is less, can't industrial metaplasia Production.
Anshan iron and steel plant discloses a kind of production method of the special cold rolling non-orientation silicon steel of high intensity（CN103882288A）, by adopting With heat treatment processes such as traditional converter smelting, hot rolling, normalizing, cold rolling and follow-up annealing, reach and improve non-orientation silicon steel The purpose of intensity and magnetic property, but preparation process is relatively complicated；Baosteel discloses a kind of high intensity non-orientation silicon steel of high magnetic strength Manufacture method（CN102453838A）, produced using the old process of traditional smelting-hot rolling-cold rolling-heat treatment, to technique It is required that it is stricter, and need higher cost of investment.These patents are all mainly to improve steel band intensity by solution strengthening, Although some strength can be improved, magnetic property deteriorates seriously, and adds substantial amounts of alloying element, causes cost of alloy significantly to increase Add, and produced using old process, technique is sufficiently complex.
Precipitation strength is the great development prospect of steel industry as a kind of effective metal material mechanics hydrodynamics method Important means.Precipitation strength requirement Second Phase Particle small and dispersed is distributed in material matrix, utilizes the second phase and sliding Interaction of dislocation mechanism plays a part of improving the strength of materials.In mild steel add content be 0.1~0.2% it is micro- Alloy element V, Ti etc. so that below 10nm carbonitrides are separated out on matrix, and intensity can be made to improve 300MPa.But for electricity For work steel, while matrix strength is improved using precipitation strength, it is also contemplated that the second relative magnetism energy of small and dispersed Influence.When the size of precipitated phase is close with magnetic domain wall thickness（30~100nm）, the ability of its pinning magnetic domain wall moving is most strong.Cause This selects suitable precipitated phase species for non-orientation silicon steel, controls its size and distribution most important.
For precipitation strength researchs of the Cu in steel, just it is widely used early in the 1960s；Cu analysis in steel Go out thing and be most commonly that ε-Cu, the ε-Cu of small size only have several nanometers.Solubility very littles of the Cu in ferrite, at solid solution Reason, substantial amounts of Cu atoms separate out in ag(e)ing process, thus increase substantially matrix strength.And Cu precipitated phases reduce full It is smaller to the inhibition of magnetic domain wall moving and compared with carbonitride with the effect very little of magnetic flux density, so can be several Do not influence to make intensity be greatly improved while magnetic property.The another advantage for using Cu precipitation strengths is Cu with simple substance Form separates out, and so, so as to reduce its content, is avoided without the concern for the content of the elements such as C, N in the design of steel-making composition Followed by cumbersome process control hot rolling, batch, in the technique such as anneal carbonitride precipitation, so as to avoid carbonitride Precipitation caused by magnetic aging phenomenon so that the magnetic property of non-orientation silicon steel finished product it is more stable during placement or military service and It is excellent.
Double roll strip casting roll process, the made-up belt of 1 ~ 5mm thickness can be gone out by molten steel direct pouring, in process of production by " casting " " rolling " is integrated, and simplifies hot-rolled process, greatly shortens technological process, improves production efficiency, have small investment, energy consumption it is low, A series of features such as efficiency height, it is the plate ＆ strip production new technology more highly efficient than sheet blank continuous casting.Strip continuous casting technology meets The greenization trend of metal material industry, is one of trend of following electrical sheet production development；It is thin by years of researches With continuous casting technology some conventional casting process productions have any problem or be difficult production material prepare in it is with the obvious advantage.
With to electrical sheet study mechanism gradually deeply and advanced technologies continuous exploration and improvement, it is low energy consumption, short Flow, efficient production technology will progressively substitute traditional mode of production mode；Electrical steel product is also increasingly towards low-loss, high-effect Direction develop；In recent years under twin-roll thin strip continuous casting process conditions, the characteristics of precipitation with reference to nanometer Cu, how Hot-roller is adjusted Skill and annealing process, make it rationally separate out, and then prepare all very excellent high intensity No yield point of magnetic property and mechanical property Silicon steel, get growing concern for.
The content of the invention
One kind is provided and is based in problem present on preparation technology and performance, the present invention for above-mentioned existing non-orientation silicon steel The method that nanometer Cu precipitation strengths prepare high intensity non-orientation silicon steel, by designing composition and technology controlling and process, gives full play to precipitation Advantage and potentiality of the intensified element in high intensity non-orientation silicon steel, obtain the high intensity non-orientation silicon steel of function admirable, and have There is the features such as flow is short, energy consumption is low, efficiency high, simple production process is effective.
The method of the present invention is carried out according to the following steps：
1st, C 0.002 ~ 0.006%, Si 2.5 ~ 3.5%, Mn are contained by mass percentage by set component smelting molten steel, composition 0.2 ~ 0.5%, Cu 0.5 ~ 2%, Alt 0.3 ~ 1.0%, Ni 0.3 ~ 2%, Cr 0.2 ~ 0.5%, S≤0.004%, N≤0.004% are remaining Measure as Fe and inevitable impurity element；Cast after the completion of smelting on dual-roller thin-band conticaster, the casting degree of superheat is 30 ~ 70 DEG C, Casting Roller rotating speed is 50 ~ 80m/min, obtains the Cast Strip that thickness is 1.8 ~ 2.5mm；
2nd, a time hot rolling is carried out after Cast Strip being cooled into hot-rolled temperature, obtains hot-strip；Wherein hot-rolled temperature is 950 ~ 1050 DEG C, drafts is 17 ~ 35%；
3rd, hot-strip carries out cold rolling after being cooled to room temperature, and overall reduction is 70 ~ 90%, obtains cold-reduced sheet；
4th, by cold-reduced sheet in 25%H2+75%N2Under atmospheric condition, it is heated to 850 ~ 1000 DEG C of 60 ~ 300s of insulation and is dissolved Processing, makes Cu elements fully be dissolved, while cold-reduced sheet is completed recrystallization；450 ~ 650 DEG C are cooled to, 20 ~ 60min of insulation enters Row Ageing Treatment, a nanometer Cu is fully separated out, then coated through insulating barrier, obtain high intensity non-orientation silicon steel.
The finished plate thickness of above-mentioned high intensity non-orientation silicon steel is 0.2 ~ 0.35mm.
The yield strength R of above-mentioned high intensity non-orientation silicon steelp0.2For 640 ~ 750MPa, tensile strength RmFor 700 ~ 850MPa.
The magnetic induction density B of above-mentioned high intensity non-orientation silicon steel50For 1.67 ~ 1.74T, core loss value P10/400For 22.5 ~ 31.5W/Kg。
The average grain size of above-mentioned high intensity non-orientation silicon steel is 20 ~ 80 μm, the sizes of nanometer Cu precipitates for 5 ~ 15nm。
The design principle of Composition Control of the present invention is：
Si：Silicon increases resistivity after being dissolved in α iron, while helps to separate in objectionable impurities carbon, and it with Oxygen, which combines, is changed into stable SiO2, avoid the distortion of lattice of iron；Therefore magnetic conductivity, reduction coercivity can be improved after adding silicon With reduction iron loss.But silicon content increases and material can be made to be hardened and becomes fragile, thermal conductivity and toughness decline；
Al：Resistivity can be significantly improved, and hardness of steel and hardness are influenceed obvious unlike Si；It stablizes ferritic Effect is more stronger than Si, and can improve { 100 } component and be reduced with { 111 } component, can increase field trash and precipitation size, subtract Little crystal grain is grown up resistance；
Cu：Its precipitation size can significantly increase the strong of non-orientation silicon steel in nanoscale, the reasonably control to precipitate Degree, while its magnetic property is not influenceed, the rich Cu metal phases of certain size and content are also favourable to reducing iron loss, and it is resistance to improve production board Corrosion energy；
Ni：ε-Cu precipitates the increasing numbers that are formed during Ageing Treatment and size can be made tiny, while broadening aging temp And time range, and prevent the hot rolled plate as caused by Cu from ftractureing, improve magnetic and corrosion resistance；
Mn：As a kind of effective intensified element, the intensity and hardness of steel can be improved, but hardness improve degree be less than Si and Al, while resistivity is improved, and punching and machinability can be improved；
Cr：High frequency iron loss and stress sensitivity are effectively reduced, iron core can be reduced in process because high-speed rotary should Magnetic property fluctuation caused by power change, while the intensity and decay resistance of steel can be improved；
C：Magnetic property is harmful to, and excessive carbon content can make electrical sheet produce magnetic aging；
O：Impurity element, the heat transfer in casting process is influenceed, and the increase of oxygen content can deteriorate the mechanical property of steel；
S：Impurity element, the mechanical property of steel is harmful to, and is easy to form the precipitates such as MnS with Mn, influence No yield point Silicon steel iron loss；
N：Impurity element, easily with the element compounds such as Al, Si, influence the magnetic property of electrical sheet, and the nitride formed, meeting Deteriorate the plasticity and toughness of steel；
P：Objectionable impurities elements, the embrittlement of process light plate is easily caused in Grain Boundary Segregation.
Compared with prior art, the features of the present invention and beneficial effect are：
（1）Using Cu as precipitation strength element, select suitable technological parameter to come controlled rolling and heat treatment process, lead to Cross the temperature and time of adjustment timeliness, to control the size and number of precipitate, and then ensure its excellent magnetic property not by To while infringement, the mechanical property of product is greatly improved；
（2）Compared with old process produces high intensity non-orientation silicon steel, flow is short, process is few, efficiency high, has given play to strip Special benefits of the continuous casting in non-orientation silicon steel production, also solve the difficulty for being difficult to overcome in old process production, significantly Production technology is simplified, there is the characteristics of easy to control, low energy consumption；
（3）The strictly content of the impurity element such as control O, N, P, S, while add reduction No yield point silicon in smelting process The element Cr of steel high frequency iron loss, the present invention in method prepare non-orientation silicon steel production board, microstructure more it is thick uniformly.
Brief description of the drawings
Fig. 1 is the method flow signal that high intensity non-orientation silicon steel is prepared based on nanometer Cu precipitation strengths in the present invention Figure；
Fig. 2 is the metallographic microstructure figure of the Cast Strip in the embodiment of the present invention 1；
Fig. 3 is the production board metallographic microstructure figure of the high intensity non-orientation silicon steel in the embodiment of the present invention 1；
Fig. 4 is micro- group of the transmission electron microscope of the nanometer Cu precipitates of the high intensity non-orientation silicon steel in the embodiment of the present invention 1 Knit figure.
Embodiment
The twin-roll thin strip continuous casting device used in the embodiment of the present invention is double disclosed in patent CN102069167B technology Roll thin-belt continuous casting testing machine.
Technological process in the present invention as shown in figure 1, molten steel by intermediate frequency vacuum induction melting after the completion of, into two Between the crystallization roll of rotation, non-orientation silicon steel thin belt of the direct pouring into 1.8 ~ 2.5mm thickness.
Metallographic structure observation is carried out using LeicaQ550IW types microscope in present example.
Using the magnetic property of MATS-2010M silicon steel measurement apparatus measurement non-orientation silicon steel monolithic in present example.
Stretching experiment is carried out using GB/T 228.1-2010 national standards at room temperature in present example.
Precipitate morphology observation is carried out using FEI Tecnai G2 F20 transmission electron microscopes in present example.
Embodiment 1
Vacuum melting furnace smelting molten steel is used by set component, molten steel composition is：C 0.006%, Si 3.2%, Mn 0.5%, Cu 1%, Alt 0.7%, Ni 0.5%, Cr 0.5%, S 0.003%, N 0.003%, surplus are Fe and inevitable impurity；So Cast afterwards on dual-roller thin-band conticaster, the casting degree of superheat is 30 DEG C, and Casting Roller rotating speed is 50m/min, and acquisition thickness is 2.2mm Cast Strip；The metallographic microstructure of Cast Strip is as shown in Figure 2；
A time hot rolling is carried out after Cast Strip is cooled into hot-rolled temperature, obtains hot-strip；Wherein hot-rolled temperature is 950 DEG C, drafts 28%；
Hot-strip carries out cold rolling after being cooled to room temperature, overall reduction 78%, obtains cold-reduced sheet；The thickness of cold-reduced sheet is 0.35mm；
By cold-reduced sheet in 25%H2+75%N2Under atmospheric condition, it is heated to 900 DEG C of insulation 200s and carries out solution treatment, then cool down To 500 DEG C, insulation 50min carries out Ageing Treatment, is then coated through insulating barrier, obtains high intensity non-orientation silicon steel；
The yield strength R of high intensity non-orientation silicon steelp0.2For 640MPa, tensile strength RmFor 700MPa；Magnetic induction intensity B50For 1.71T, core loss value P10/400For 25.8W/Kg；Average grain size is 20 μm, and the size of nanometer Cu precipitates is 10nm； The metallographic microstructure of high intensity non-orientation silicon steel production board is as shown in figure 3, the transmission electron microscope photo of precipitate is as shown in Figure 4.
Embodiment 2
Vacuum melting furnace smelting molten steel is used by set component, molten steel composition is：C 0.002%, Si 3.5%, Mn 0.3%, Cu 2%, Alt 0.3%, Ni1%, Cr 0.4%, S 0.002%, N 0.003%, surplus are Fe and inevitable impurity；Then exist Cast on dual-roller thin-band conticaster, the casting degree of superheat is 70 DEG C, and Casting Roller rotating speed is 70m/min, obtains the casting that thickness is 1.9mm Band；
A time hot rolling is carried out after Cast Strip is cooled into hot-rolled temperature, obtains hot-strip；Wherein hot-rolled temperature is 1000 DEG C, drafts 33%；
Hot-strip carries out cold rolling after being cooled to room temperature, overall reduction 84%, obtains cold-reduced sheet；The thickness of cold-reduced sheet is 0.2mm；By cold-reduced sheet in 25%H2+75%N2Under atmospheric condition, it is heated to 1000 DEG C of insulation 60s and carries out solution treatment, be cooled to 550 DEG C, insulation 30min carries out Ageing Treatment, is then coated through insulating barrier, obtains high intensity non-orientation silicon steel；
The yield strength R of high intensity non-orientation silicon steelp0.2For 750MPa, tensile strength RmFor 850MPa；Magnetic induction intensity B50For 1.69T, core loss value P10/400For 30.5W/Kg；Average grain size is 56 μm, and the size of nanometer Cu precipitates is 5nm.
Embodiment 3
Vacuum melting furnace smelting molten steel is used by set component, molten steel composition is：C 0.002%, Si 2.5%, Mn 0.2%, Cu 0.5%, Alt 1.0%, Ni 2%, Cr 0.3%, S 0.002%, N 0.003%, surplus are Fe and inevitable impurity；So Cast afterwards on dual-roller thin-band conticaster, the casting degree of superheat is 40 DEG C, and Casting Roller rotating speed is 60m/min, and acquisition thickness is 2.5mm Cast Strip；
A time hot rolling is carried out after Cast Strip is cooled into hot-rolled temperature, obtains hot-strip；Wherein hot-rolled temperature is 980 DEG C, drafts 17%；
Hot-strip carries out cold rolling after being cooled to room temperature, overall reduction 90%, obtains cold-reduced sheet；The thickness of cold-reduced sheet is 0.2mm；
By cold-reduced sheet in 25%H2+75%N2Under atmospheric condition, it is heated to 850 DEG C of insulation 300s and carries out solution treatment, then cool down To 650 DEG C, insulation 20min carries out Ageing Treatment, is then coated through insulating barrier, obtains high intensity non-orientation silicon steel；
The yield strength R of high intensity non-orientation silicon steelp0.2For 680MPa, tensile strength RmFor 788MPa；Magnetic induction intensity B50For 1.74T, core loss value P10/400For 31.5W/Kg；Average grain size is 80 μm, and the size of nanometer Cu precipitates is 15nm.
Embodiment 4
Vacuum melting furnace smelting molten steel is used by set component, molten steel composition is：C 0.003%, Si 2.8%, Mn 0.4%, Cu 1.5%, Alt 0.5%, Ni 0.3%, Cr 0.2%, S 0.003%, N 0.004%, surplus are Fe and inevitable impurity； Then cast on dual-roller thin-band conticaster, the casting degree of superheat is 50 DEG C, and Casting Roller rotating speed is 80m/min, obtains thickness and is 1.8mm Cast Strip；
A time hot rolling is carried out after Cast Strip is cooled into hot-rolled temperature, obtains hot-strip；Wherein hot-rolled temperature is 1050 DEG C, drafts 35%；
Hot-strip carries out cold rolling after being cooled to room temperature, overall reduction 70%, obtains cold-reduced sheet；The thickness of cold-reduced sheet is 0.35mm；
By cold-reduced sheet in 25%H2+75%N2Under atmospheric condition, it is heated to 950 DEG C of insulation 100s and carries out solution treatment, then cool down To 450 DEG C, insulation 60min carries out Ageing Treatment, is then coated through insulating barrier, obtains high intensity non-orientation silicon steel；
The yield strength R of high intensity non-orientation silicon steelp0.2For 660MPa, tensile strength RmFor 790MPa；Magnetic induction intensity B50For 1.67T, core loss value P10/400For 22.5W/Kg；Average grain size is 77 μm, and the size of nanometer Cu precipitates is 8nm.
Embodiment 5
Vacuum melting furnace smelting molten steel is used by set component, molten steel composition is：C 0.005%, Si 3.0%, Mn 0.5%, Cu 1.8%, Alt 0.8%, Ni 1.5%, Cr 0.4%, S 0.002%, N 0.004%, surplus are Fe and inevitable impurity； Then cast on dual-roller thin-band conticaster, the casting degree of superheat is 45 DEG C, and Casting Roller rotating speed is 50m/min, obtains thickness and is 2.3mm Cast Strip；
A time hot rolling is carried out after Cast Strip is cooled into hot-rolled temperature, obtains hot-strip；Wherein hot-rolled temperature is 1020 DEG C, drafts 25%；
Hot-strip carries out cold rolling after being cooled to room temperature, overall reduction 88%, obtains cold-reduced sheet；The thickness of cold-reduced sheet is 0.2mm；
By cold-reduced sheet in 25%H2+75%N2Under atmospheric condition, it is heated to 900 DEG C of insulation 180s and carries out solution treatment, then cool down To 550 DEG C, insulation 40min carries out Ageing Treatment, is then coated through insulating barrier, obtains high intensity non-orientation silicon steel；
The yield strength R of high intensity non-orientation silicon steelp0.2For 720MPa, tensile strength RmFor 830MPa；Magnetic induction intensity B50For 1.72T, core loss value P10/400For 29.5W/Kg；Average grain size is 65 μm, and the size of nanometer Cu precipitates is 12nm.

Claims (1)

  1. A kind of 1. method that high intensity non-orientation silicon steel is prepared based on nanometer Cu precipitation strengths, it is characterised in that enter according to the following steps OK：
    （1）By set component smelting molten steel, composition contains C 0.002 ~ 0.006%, Si 2.5 ~ 3.5%, Mn 0.2 by mass percentage ~ 0.5%, Cu 0.5 ~ 2%, Alt 0.3 ~ 1.0%, Ni 0.3 ~ 2%, Cr 0.2 ~ 0.5%, S≤0.004%, N≤0.004%, surplus are Fe and inevitable impurity element；To be cast after the completion of smelting on dual-roller thin-band conticaster, the casting degree of superheat is 30 ~ 70 DEG C, Casting Roller rotating speed is 50 ~ 80m/min, obtains the Cast Strip that thickness is 1.8 ~ 2.5mm；
    （2）A time hot rolling is carried out after Cast Strip is cooled into hot-rolled temperature, obtains hot-strip；Wherein hot-rolled temperature be 950 ~ 1050 DEG C, drafts is 17 ~ 35%；
    （3）Hot-strip carries out cold rolling after being cooled to room temperature, and overall reduction is 70 ~ 90%, obtains cold-reduced sheet；
    （4）By cold-reduced sheet in 25%H2+75%N2Under atmospheric condition, it is heated to 850 ~ 1000 DEG C of 60 ~ 300s of insulation and carries out at solid solution Reason, makes Cu elements fully be dissolved, while cold-reduced sheet is completed recrystallization；450 ~ 650 DEG C are cooled to, 20 ~ 60min of insulation is carried out Ageing Treatment, a nanometer Cu is fully separated out, then coated through insulating barrier, obtain the high intensity that finished plate thickness is 0.2 ~ 0.35mm Non-orientation silicon steel；The yield strength R of described high intensity non-orientation silicon steelp0.2For 640 ~ 750MPa, tensile strength RmFor 700 ~ 850MPa, magnetic induction density B50For 1.67 ~ 1.74T, core loss value P10/400For 22.5 ~ 31.5W/Kg, average grain size is 20 ~ 80 μm, the size of nanometer Cu precipitates is 5 ~ 15nm.
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