CN108085603B - A kind of high grade non-oriented silicon steel preparation method based on thin strap continuous casting - Google Patents

A kind of high grade non-oriented silicon steel preparation method based on thin strap continuous casting Download PDF

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CN108085603B
CN108085603B CN201810081919.6A CN201810081919A CN108085603B CN 108085603 B CN108085603 B CN 108085603B CN 201810081919 A CN201810081919 A CN 201810081919A CN 108085603 B CN108085603 B CN 108085603B
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silicon steel
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cast strip
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CN108085603A (en
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焦海涛
许云波
曹光明
李成刚
张元祥
李建平
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Northeastern University China
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/004Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216Modifying 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
    • C21D8/1227Warm rolling
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/001Ferrous alloys, e.g. steel alloys containing N
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium

Abstract

The invention belongs to metallurgical technology field, in particular to a kind of high grade non-oriented silicon steel preparation method based on thin strap continuous casting.High grade non-oriented silicon steel according to the present invention, chemical composition comprises the following components in percentage by weight are as follows: C≤0.004%, Si:2.6~3.4%, Mn:0.1~0.4%, Al:0.4~0.8%, S≤0.003%, N≤0.003%, other is Fe.Molten steel after smelting is prepared into the Cast Strip 2~3mm through strip casting machine, it is directly batched after 8~15% hot rollings at 1000~1150 DEG C, then after 1000~1100 DEG C of 10~20min of heat preservation, carries out pickling and warm-rolling, warm-rolling temperature is 200~500 DEG C, and drafts is 70~85%.Coiled sheet after warm-rolling is annealed and coating treatment prepares orientation free silicon steel plate.Present invention process is simple, saves energy consumption and equipment investment, while being remarkably improved the magnetic strength value of high grade non-oriented silicon steel.

Description

A kind of high grade non-oriented silicon steel preparation method based on thin strap continuous casting
Technical field
The invention belongs to metallurgical technology field, in particular to a kind of high grade non-oriented silicon steel preparation based on thin strap continuous casting Method.
Background technique
Energy shortage and environmental pollution are the problem of power industry become increasingly conspicuous, this will promote the further small of electronic product Type, high efficiency development, and develop low iron loss, the cold rolling non-orientation silicon steel of high magnetic flux density is to reduce existing motor product body Product, the main path for reducing energy consumption, improving efficiency.In the conventional manufacturing procedures of non-orientation silicon steel, heavy big pressure hot rolling So that generating strong α (<110>//RD) and γ (<111>//ND) unfavorable texture all components in hot rolled plate, and then it is genetic to cold rolling In plate and finished products plate, cause product magnetic strength value generally lower, the further promotion of limiting motor efficiency.Existing No yield point In silicon steel technology of preparing, Chinese patent CN104294185B " a kind of high-efficiency non-oriented electrical steel for motor and production method " and CN 104404396B " a kind of non-oriented silicon steel with high magnetic induction without normalizing and with sheet billet production method " is respectively in non-orientation silicon steel Middle addition suitable (Sn+Sb) and (Cu+P+Sn) makes the magnetic strength value of finished product get a promotion, but this will increase relevant alloy Cost.
Thin strap continuous casting can significantly shorten conventional hot rolling technology, have the advantages such as energy-saving and environmental protection.Currently, thin strap continuous casting Application of the technology in terms of preparing non-orientation silicon steel is reported.Chinese patent CN102274936B announces a kind of based on double The temperature of molten steel is increased to 1610~1720 by the manufacturing method of the orientation free silicon steel plate of roll thin-belt continuous casting technology, the patent DEG C, and certain warm-rolling is introduced before cold rolling, so that B50 is obtained in the non-orientation silicon steel of 1.71T or so, although its magnetic strength value phase It increases to conventional products, but still lower.A kind of Chinese patent CN104762551B " high-magnetic strength non-oriented silicon of thin strap continuous casting The manufacturing method of steel " and CN102936644B " a method of improve twin-roll thin strip continuous casting non-oriented electrical steel magnetic property " pass through The column crystal of larger proportion is obtained in Cast Strip, and introduces certain hot rolling before cold rolling, and cold roling reduction control is existed 60% hereinafter, so that obtain the non-orientation silicon steel product of high magnetic strength, but its be only capable of further promoting product magnetic strength value 0.01~ 0.03T.Therefore, there is still a need for probing into efficient preparation process, further increases the magnetic strength of non-orientation silicon steel, reduces iron loss, from And meet the requirement of Chinese society economic development.Present patent application is subsidized in project of national nature science fund project (51674080) Lower completion.
Summary of the invention
The high grade non-oriented silicon steel preparation method based on thin strap continuous casting that the object of the present invention is to provide a kind of, purpose improve The cold rolling plasticity of Cast Strip, and further increase the magnetic strength value of high grade non-oriented silicon steel.
The technical scheme is that
A kind of high grade non-oriented silicon steel preparation method based on thin strap continuous casting, sequentially includes the following steps:
(1) molten steel is smelted, the Cast Strip of 2~3mm thickness is obtained using dual-roller thin-band conticaster, Cast Strip goes out after roller through 8~15% It is directly crimped after pressure, and is sent into holding furnace and keeps the temperature 10~20min, be then air-cooled to room temperature;
(2) Cast Strip carries out warm-rolling after pickling, is rolled to finished product thickness 0.50mm;
(3) warm-rolling plate is annealed in protective atmosphere, non-orientation silicon steel finished product is obtained after coating.
In step (1), the coiling temperature is 1000~1150 DEG C, and Cast Strip holding temperature is 1000~1100 DEG C, is protected The warm time is 10~30min.
In step (2), the warm-rolling temperature is 200~500 DEG C, total reduction 70~85%.
In step (3), the annealing temperature is 950~1100 DEG C, and soaking time is 2~6min;By percent by volume Meter, annealing atmosphere H2>=40% hydrogen and the mixed gas of nitrogen, dew point≤- 15 DEG C.
Related high grade non-oriented silicon steel, chemical composition comprises the following components in percentage by weight are as follows: C≤0.004%, Si:2.6 ~3.4%, Mn:0.1~0.4%, Al:0.4~0.8%, S≤0.003%, N≤0.003%, other is Fe.
The non-orientation silicon steel transverse and longitudinal be averaged magnetic strength B50 be 1.735~1.745T, iron loss P15/50 be 2.95~ 3.25W/kg。
The invention has the advantages and beneficial effects that:
(1) Cast Strip of the present invention directly carries out high temperature coiling and isothermal holding after small deformation, on the one hand can guarantee Cast Strip On the other hand plate shape can save the waste heat of Cast Strip.In addition, Cast Strip high-temperature heat treatment can promote the particle being dissolved in Cast Strip to analyse Out and it is roughened, so that the pinning effect that recrystal grain is grown up when reducing it to annealing, reduces iron loss.
(2) Cast Strip of the present invention, which carries out warm-rolling, can reduce mill load, improve plate shape, improve lumber recovery.In addition, Cast Strip temperature Roll { 100 }<0vw>and { hkl }<001>the favorable texture component that can be enhanced in annealed sheet.
(3) product magnetic strength value of the invention improves 0.05~0.08T than existing same trade mark commercially produced product.
(4) manufacturing process of the invention is simple, compact, saves energy consumption and equipment investment, reduces cost.
Detailed description of the invention
Fig. 1 is thin strap continuous casting high grade non-oriented silicon steel preparation process schematic diagram of the invention.
Fig. 2 is the tissue of annealed sheet in the embodiment of the present invention 2.
Fig. 3 is the texture of annealed sheet in the embodiment of the present invention 2.
Specific embodiment
In the specific implementation process, as shown in Figure 1, thin strap continuous casting high grade non-oriented silicon steel preparation process of the invention such as Under: control molten steel pouring temperature is 1530~1590 DEG C, is poured into tundish after smelting molten steel, flows into strip through cloth flowing water mouth and connects Molten bath is formed in the crystallizer of casting machine, the crystallization roll rotated at two and side seal board composition, forms Cast Strip after molten steel solidification;By It is directly batched after 5~15% hot rolling of a time;Hot rolling carries out pickling and warm-rolling after Overheating Treatment;Warm-rolling plate is through recrystallizing Coating treatment is carried out after annealing.
In the following, being further elaborated on by embodiment to the present invention.
Embodiment 1
In the present embodiment, the high grade non-oriented silicon steel preparation method based on thin strap continuous casting is sequentially included the following steps:
By weight percentage, intermediate frequency vacuum induction furnace smelting ingredient is utilized are as follows: C 0.0035%, Si 2.6%, Mn 0.15%, Al 0.45%, S 0.0027%, N 0.0030%, surplus are the molten steel of Fe, and control molten steel pouring temperature is 1590 DEG C, the Cast Strip 2.2mm is obtained using dual-roller thin-band conticaster.Cast Strip is directly crimped after 12% pressure after going out roller, curling temperature 1150 DEG C of degree.Cast Strip is sent into 1100 DEG C of holding furnace after keeping the temperature 10min and is air-cooled to room temperature.Cast Strip is then subjected to pickling simultaneously Warm-rolling is to 0.5mm, reduction ratio 75%, and 200 DEG C of warm-rolling temperature.Then annealing that warm-rolling plate is carried out to 1100 DEG C, 3min, gas of annealing Atmosphere is 50%N2+ 50%H2(percent by volume), obtains orientation free silicon steel plate after coating by -15 DEG C of dew point.The present embodiment preparation The non-orientation silicon steel production board transverse and longitudinal magnetic strength B50 that is averaged be 1.745T, horizontal, longitudinal iron loss that is averaged is 3.05W/kg, more routinely High 0.06~the 0.08T of magnetic induction intensity of the orientation free silicon steel plate of method preparation.
Embodiment 2
In the present embodiment, the high grade non-oriented silicon steel preparation method based on thin strap continuous casting is sequentially included the following steps:
By weight percentage, intermediate frequency vacuum induction furnace smelting ingredient is utilized are as follows: C 0.0037%, Si 3.0%, Mn 0.35%, Al 0.72%, S 0.0025%, N 0.0027%, surplus are the molten steel of Fe, and control molten steel pouring temperature is 1550 DEG C, the Cast Strip 2.5mm is obtained using dual-roller thin-band conticaster.Cast Strip is directly crimped after 15% pressure after going out roller, curling temperature 1070 DEG C of degree.Cast Strip is sent into 1000 DEG C of holding furnace after keeping the temperature 20min and is air-cooled to room temperature.Cast Strip is then subjected to pickling simultaneously Warm-rolling is to 0.5mm, reduction ratio 76%, and 320 DEG C of warm-rolling temperature.Then annealing that warm-rolling plate is carried out to 950 DEG C, 6min, gas of annealing Atmosphere is 60%N2+ 40%H2(percent by volume), obtains orientation free silicon steel plate after coating by -20 DEG C of dew point.The present embodiment preparation The non-orientation silicon steel production board transverse and longitudinal magnetic strength B50 that is averaged be 1.741T, horizontal, longitudinal iron loss that is averaged is 2.98W/kg, more routinely High 0.06~the 0.08T of magnetic induction intensity of the orientation free silicon steel plate of method preparation.
As shown in Figure 2 and Figure 3, it can be seen that from the tissue of annealed sheet and texture compared to conventional products, technique preparation Non-orientation silicon steel tissue it is relatively uniform, unfavorable γ component almost disappears in texture, and shows advantageous strong Goss component, To significantly improve magnetic strength.
Embodiment 3
In the present embodiment, the high grade non-oriented silicon steel preparation method based on thin strap continuous casting is sequentially included the following steps:
By weight percentage, intermediate frequency vacuum induction furnace smelting ingredient is utilized are as follows: C 0.0037%, Si 3.4%, Mn 0.25%, Al 0.54%, S 0.0025%, N 0.0030%, surplus are the molten steel of Fe, and control molten steel pouring temperature is 1540 DEG C, the Cast Strip 3.0mm is obtained using dual-roller thin-band conticaster.Cast Strip is directly crimped after 8% pressure after going out roller, coiling temperature 1020℃.Cast Strip is sent into 1000 DEG C of holding furnace after keeping the temperature 20min and is air-cooled to room temperature.Cast Strip is then subjected to pickling and temperature It is rolled to 0.5mm, reduction ratio 82%, 450 DEG C of warm-rolling temperature.Then warm-rolling plate is carried out to the annealing of 1100 DEG C, 2min, annealing atmosphere For 40%N2+ 60%H2(percent by volume), obtains orientation free silicon steel plate after coating by -18 DEG C of dew point.It is manufactured in the present embodiment The transverse and longitudinal of non-orientation silicon steel production board is averaged magnetic strength B50 as 1.737T, and average iron loss is 2.95W/kg, prepares compared with conventional method Orientation free silicon steel plate the high 0.06~0.08T of magnetic induction intensity.
Embodiment 4
In the present embodiment, the high grade non-oriented silicon steel preparation method based on thin strap continuous casting is sequentially included the following steps:
By weight percentage, intermediate frequency vacuum induction furnace smelting ingredient is utilized are as follows: C 0.0037%, Si 3.4%, Mn 0.25%, Al 0.54%, S 0.0025%, N 0.0030%, surplus are the molten steel of Fe, and control molten steel pouring temperature is 1540 DEG C, the Cast Strip 3.0mm is obtained using dual-roller thin-band conticaster.Cast Strip is directly crimped after 8% pressure after going out roller, coiling temperature 1020℃.Cast Strip is sent into 1000 DEG C of holding furnace after keeping the temperature 20min and is air-cooled to room temperature.Cast Strip is then subjected to pickling and temperature It is rolled to 0.5mm, reduction ratio 82%, 500 DEG C of warm-rolling temperature.Then warm-rolling plate is carried out to the annealing of 1050 DEG C, 3min, annealing atmosphere For 50%N2+ 50%H2(percent by volume), obtains orientation free silicon steel plate after coating by -20 DEG C of dew point.It is manufactured in the present embodiment Non-orientation silicon steel production board transverse and longitudinal is averaged magnetic strength B50 as 1.735T, and horizontal, longitudinal iron loss that is averaged is 3.24W/kg, relatively routine side High 0.05~the 0.07T of magnetic induction intensity of the orientation free silicon steel plate of method preparation.
Embodiment 5
In the present embodiment, the high grade non-oriented silicon steel preparation method based on thin strap continuous casting is sequentially included the following steps:
By weight percentage, intermediate frequency vacuum induction furnace smelting ingredient is utilized are as follows: C 0.0035%, Si 3.1%, Mn 0.3%, Al 0.55%, S 0.0030%, N 0.0028%, surplus are the molten steel of Fe, and control molten steel pouring temperature is 1550 DEG C, the Cast Strip 2.0mm is obtained using dual-roller thin-band conticaster.Cast Strip is directly crimped after 15% pressure after going out roller, curling temperature 1070 DEG C of degree.Cast Strip is sent into 1000 DEG C of holding furnace after keeping the temperature 20min and is air-cooled to room temperature.Cast Strip is then subjected to pickling simultaneously Warm-rolling is to 0.5mm, reduction ratio 70%, and 250 DEG C of warm-rolling temperature.Then annealing that warm-rolling plate is carried out to 1000 DEG C, 4min, gas of annealing Atmosphere is 60%N2+ 40%H2(percent by volume), obtains orientation free silicon steel plate after coating by -15 DEG C of dew point.The present embodiment preparation The non-orientation silicon steel production board transverse and longitudinal magnetic strength B50 that is averaged be 1.740T, horizontal, longitudinal iron loss that is averaged is 3.15W/kg, more routinely High 0.06~the 0.08T of magnetic induction intensity of the orientation free silicon steel plate of method preparation.
Embodiment the result shows that, present invention process is simple, saves energy consumption and equipment investment, while being remarkably improved the high trade mark The magnetic strength value of non-orientation silicon steel.

Claims (1)

1. a kind of high grade non-oriented silicon steel preparation method based on thin strap continuous casting, which is characterized in that sequentially include the following steps:
(1) molten steel is smelted, obtains the Cast Strip of 2 ~ 3mm thickness using dual-roller thin-band conticaster, Cast Strip goes out after roller after 8 ~ 15% pressures directly It connects and is crimped, and be sent into holding furnace and keep the temperature 10 ~ 20min, be then air-cooled to room temperature;
(2) Cast Strip carries out warm-rolling after pickling, is rolled to finished product thickness 0.50mm;
(3) warm-rolling plate is annealed in protective atmosphere, non-orientation silicon steel finished product is obtained after coating;
In step (1), the coiling temperature is 1000 ~ 1150 DEG C, and Cast Strip holding temperature is 1000 ~ 1100 DEG C, soaking time For 10 ~ 20min;
In step (2), the warm-rolling temperature is 200 ~ 500 DEG C, total reduction 70 ~ 85%;
In step (3), the annealing temperature is 950 ~ 1100 DEG C, and soaking time is 2 ~ 6min;By volume percentage, annealing Atmosphere is H2>=40% hydrogen and the mixed gas of nitrogen, dew point≤- 15 DEG C;
Related high grade non-oriented silicon steel, chemical composition comprises the following components in percentage by weight are as follows: C≤0.004%, Si:2.6 ~ 3.4%, Mn:0.1 ~ 0.4%, Al:0.4 ~ 0.8%, S≤0.003%, N≤0.003%, other is Fe;
The non-orientation silicon steel transverse and longitudinal is averaged magnetic strength B50 as 1.735 ~ 1.745T, and iron loss P15/50 is 2.95 ~ 3.25W/ kg。
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