CN105290353A - Method for preparing high silicon thin steel strip through single-roller melt spinning method - Google Patents
Method for preparing high silicon thin steel strip through single-roller melt spinning method Download PDFInfo
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Abstract
The invention discloses a method for preparing a high silicon thin steel strip through a single-roller melt spinning method. The method comprises the steps of 1) feeding high silicon steel mother alloy into a vacuum furnace for vacuum melting, and preheating a heat preservation ladle; 2) introducing a protective gas into the vacuum furnace and the heat preservation ladle till positive pressure is reached, opening a gate valve when the air pressure inside the vacuum furnace approaches the air pressure inside the heat preservation ladle, lowering the whole heat preservation ladle to a working position above a crystallization roller, turning on the crystallization roller, and releasing a puddle protective gas; 3) pouring molten silicon steel obtained through smelting into a spray ladle inside the heat preservation ladle, and turning on a gas stripping device, so as to enable molten steel to flow from a nozzle slot at the bottom of the spray ladle to the rotating crystallization roller below a nozzle to be quenched to form the thin strip; and 4) after the molten steel is poured completely, closing the gate valve, increasing the pressure of the protective gas inside the heat preservation ladle, and controlling the molten steel inside the spray ladle to be quickly and uniformly sprayed from the nozzle to the crystallization roller through a pressure closed-loop control till the strip spraying is over. The method has the advantages that the forming property of strip spraying is good, the strip width range is large, and a finished product is good in shape and magnetism.
Description
Technical field
The present invention relates to a kind of silicon steel sheet production method, refer to that a kind of melt spinning prepares the method for high silicon steel thin belt especially.
Background technology
Research shows, silicone content (mass content, silicon steel down together) 6% ~ 8% has the most excellent soft magnetic characteristic, this is because along with the increase of silicon in alloy, ferritic growth is promoted, thus the initial magnetic permeability of steel and maximum permeability also strengthen gradually, and occur peak value at 6% ~ 8% place, and magnetic hystersis loss is greatly reduced; Silicone content is 7% ~ 12% time, and the resistivity of silicon steel also reaches maximum, and suitable with non-crystaline amorphous metal, it is minimum that this makes eddy-current loss be down to; The increase of silicone content, also makes the magnetostrictivity of silicon steel reduce, and reduce to zero 6.5% time.
But along with the raising of silicone content, yield strength and the tensile strength of silicon steel obviously increase, when silicone content > 2.5%, percentage elongation sharply declines, and during silicone content > 4.5%, percentage elongation drops to zero rapidly, and hardness increases with silicone content and continues to improve.Therefore, during silicone content > 4.5%, not only material hard but also crisp and cannot cold working.For this reason, the silicone content of hot rolled silicon steel sheet is defined as 4.5%, and cold-reduced silicon sheet is then decided to be 3.3%.Because the silicon content of silicon steel does not reach the best, limit the performance of its most excellent soft magnetic characteristic.
High silicon steel alleged by the present invention refers to the silicon steel of silicone content between 4.5% ~ 6.7%, and the method for the high silicon steel of preparation has at present:
(1) rolling
NKK adopts low temperature heavy reduction rate Hot rolling to obtain Fiber Laminated and organizes hot rolled plate, again through warm-rolling, annealing and coated insulating film, produce the 6.5%Si-Fe alloy strip that 0.35 ~ 0.50mm is thick, manufacturing process is: slab is 700 DEG C of shove charges, heating-up temperature 1150 DEG C in stove, after ejection at 1050 ~ 1150 DEG C through being greater than 50% reduction ratio roughing, obtain Fiber Laminated hot rolled plate tissue, finish rolling is being started lower than 1100 DEG C, after making its recrystallization, crystal grain extends, form bacillar structure, finishing temperature is 780 ~ 850 DEG C.After hot rolled coil pickling, warm-rolling is carried out in heating-up temperature to 250 ~ 400 DEG C, and total reduction is 50% ~ 90%.Be with steel first through 200 ~ 400 DEG C × 1 ~ 180min preannealing after warm-rolling, then at H
2in 1000 ~ 1200 DEG C × 1 ~ 10min anneal and coated insulating film, final annealing is at H
2in or 10
-3carry out in Pa vacuum, annealing temperature is 600 ~ 1000 DEG C, insulation 0.5 ~ 300min.
Nippon Steel Corp is by 6.5%Si steel strand after 1200 DEG C of heating and 15% ~ 40% reduction ratio roughing, then with 10 DEG C/min heating rate to 1200 DEG C, through 1100 ~ 1120 DEG C of hot rollings to thickness 1.8 ~ 2.3mm, finishing temperature is 980 ~ 1000 DEG C.Through 170 ~ 300 DEG C of warm-rollings or at N after hot-rolled strip pickling
2middle through 920 ~ 1050 DEG C × 30s normalizing, warm-rolling when making thickness of slab direction be all recrystal grain, warm-rolling is to thickness 0.20 ~ 0.35mm.At dry H
2in 850 ~ 950 DEG C × 30 ~ 90s anneal and coated insulating film, finally carry out 5% critical strain and annealing.
(2) CVD continuous siliconising method fast
NKK replaced rolling to produce 6.5%Si steel in 1994 by CVD, and product thickness is 0.05mm, 0.10mm, 0.20mm, 0.30mm, Breadth Maximum 640mm.CVD is that 3%Si non-oriented silicon steel strip thick for 0.1 ~ 0.35mm is quickly heated up to 1000 DEG C in non-oxidizing atmosphere stove, enter siliconising district again to be greater than 50 DEG C/min heating rate to 1050 ~ 1200 DEG C, sprayed containing 5% ~ 30%SiCl toward steel strip surface by upper and lower several groups of nozzles
4the N of gas
2, H
2, or Ar atmosphere, steel band traffic direction is contrary with atmosphere circulating direction.Siliconising chemical equation is: SiCl
4+ 5Fe → Fe
3si+2FeCl
2↑, the FeCl of generation
2gas is run away rapidly.Form the rich Si layer being less than 14.3%Si by CVD top layer, tack is good.The continuous siliconising time is 3 ~ 10min, after siliconising, steel band is by diffusion soaking zone, and about 1200 DEG C of even DIFFUSION TREATMENT 5 ~ 20min in non-oxidizing atmosphere, make thickness of slab and plate width direction silicon be evenly distributed, and 1.5 ~ 2.0 times that average grain size is grown up to thickness of slab, improve magnetic.Last steel band is batched by coated insulating film behind cooling zone and 250 ~ 300 DEG C.
(3) flash set technology
In recent years, flash set technology obtains the development of advancing by leaps and bounds in metal material processing preparation.Utilize flash set technology to achieve some achievements to the preparation of high silicon steel thin belt, and show and wish place.
1) melt spinning
1978, N.Tsuya and K.T.Arai utilized single roller belt-rejecting technology to produce the 6.5%Si height silicon steel thin belt of 0.03 ~ 0.1mm, and ultrafine grain structure arouses great concern.Late comer prepares 6.5%Si height silicon steel, Sendust alloy and Fe to this technique of utilization
3the various Fe such as Si
3si base alloy has carried out large quantifier elimination.Certain R&D institution domestic application quick setting method successfully have developed magnetostriction close to the 6.5%Si-Fe as cast condition strip in razor-thin (thick 40 ~ 60 μm, wide 10 ~ 25mm) of zero-sum resistivity up to 82 μ Ω cm.
The main feature of this technique is exactly that the shape and size of the two-sided cooling and solidification zone that can realize sheet metal strip can regulate, and thickness regulating power is flexible.But these researchs are only only limitted to applied basic research, carry out large-scale production also very difficult, its reason is exactly with this explained hereafter strip out, thickness and limited width, and shape is also not fully up to expectations.
2) thin-belt casting rolling technique
Double-roll type thin strap continuous casting also claims strip continuous casting and rolling, is take liquid metal as raw material, with the contrary casting roll of two rotation directions for crystallizer, directly produces with molten steel the new technology that thickness is the nearly end form Thin Strip Steel of 1 ~ 10mm.Major technique has the twin-roll thin strip continuous casting production line etc. of Eurostrip, Castrip and Nippon Steel/Mitsubishi Heavy Industries Ltd's exploitation in the world at present, China's research twin-roll thin strip continuous casting technology starts from 20th century the mid-80, and current research mainly concentrates on Baosteel, Northeastern University, University Of Chongqing, south continuous casting company of Nanchang City and Wuhan Iron and Steel Plant.
Domestic certain R&D institution adopts the technical process of thin-belt casting rolling explained hereafter 6.5%Si steel to be: 6.5%Si steel raw material after vacuum drying oven melting, at N
2with the Cast Strip pouring into thickness about 2.5mm under Ar protective atmosphere through double roll strip casting mill, at N
2form the 6.5%Si steel strip of thickness about 0.3mm under protective atmosphere through hot rolling and warm-rolling, after heat treatment, form finished product.
3) spray-up method
Spray deposition processing relates to the multi-field new material technology of preparing such as powder metallurgy, liquid metal atomization, quick cooling and nonequilibrium freezing.Its feature is exactly deposit on the receiver of definite shape by the liquid metal molten drop through gas atomization, directly makes the product of definite shape.Because this technology is the flexible manufacturing system with versatility and product diversity, thickness is unrestricted, and shape of product also easily controls, so it is feasible for preparing 6.5%Si height silicon steel by the method, also gets a good chance of.Regrettably, there be limited evidence currently of has the report of this respect.
In above introduced manufacture method, rolling adopts rolling, annealing, rolling, annealing etc. repeatedly repeatedly, and cause the process-cycle long, lumber recovery is low, and energy consumption is high, and magnetic property does not reach optimum range.Also have researcher to add the trace elements such as Cu, Cr, P, B in the molten steel of Fe-6.5% (quality) Si, although can improve some plasticity and machinability, final finished magnetic is poor.
CVD technique obtains successfully, but still there are the following problems: 1) depositing temperature is high, and energy consumption is large, and equipment corrosion is serious, the lost of life; 2) that CVD technique is leaned on is SiCl
4fe is formed by corrosion iron surface
3si and depositing, thus can produce corrosion hollow on surface with uneven, need warm-rolling smooth, this makes troubles to production; 3) by the FeC1 that CVD technique produces
2waste gas is serious environment pollution both, causes again the loss of iron.
At present, for flash set technology, the high silicon steel thin belt width that melt spinning is produced is narrow, and plate shape is poor; Thin-belt casting rolling technique is still under test at present, and efficiency is low, still has gap from industrialization; Spray-up method requires high to process equipment, applies less.
Summary of the invention
The object of the present invention is to provide a kind of strip production board shape better, melt spinning that bandwidth range is larger prepares the method for high silicon steel thin belt.
For achieving the above object, melt spinning provided by the present invention prepares the method for high silicon steel thin belt, comprises the following steps: 1) obtain molten steel by carrying out vacuum melting in high silicon steel foundry alloy input vacuum drying oven; Preheating insulation bag, the freezing point of the molten steel that its temperature is obtained higher than melting, solidifies when avoiding molten steel in subsequent step to enter insulation bag; 2) in vacuum drying oven and insulation bag, protective gas is passed into malleation, when vacuum drying oven internal gas pressure and insulation bag internal gas pressure close to time, open the weld pool protection gas of push-pull valve between the two and the crystallization roll left and right sides, operating position above insulation bag entire lowering to crystallization roll, opens crystallization roll and weld pool protection gas; 3) the silicon steel water that vacuum drying oven melting obtains is poured onto among the spray bag in insulation bag, open gas stripping device, molten steel starts to flow out to the crystallization roll that rotates below nozzle from spray bag bottom nozzle seam to be formed strip by chilling, in this process, the weld pool protection gas opened in advance can prevent the strip oxidation by air formed; 4) after molten steel is toppled over, close push-pull valve, strengthen protective gas pressure in insulation bag, control molten steel in spray bag is sprayed onto crystallization roll until the spray end of tape from nozzle quickly and evenly by pressure closed loop.The order of some step is not affecting under the prerequisite that method implements above, can carry out local directed complete set, can hotsync pre-with it or successively carry out, as long as carried out before opening push-pull valve as passed into protective gas in insulation bag; As long as and for example crystallization roll roller and weld pool protection gas carried out before molten steel pours into spray bag.This adjustment can be considered as being equal to the present invention.
The realization of said method, can adopt the vacuum melting list roller of following structure to get rid of belting: this device comprises vacuum drying oven, the insulation bag that is communicated with vacuum drying oven by changeover portion, be arranged on the crystallization roll device being incubated and wrapping below; Be provided with smelting apparatus and water conservancy diversion funnel in vacuum drying oven, smelting apparatus comprises the support be fixed in vacuum drying oven and the melting kettle be arranged on support, and water conservancy diversion funnel is arranged on the below of melting kettle, and water conservancy diversion funnel end is communicated with the top of changeover portion; Be provided with spray bag in insulation bag and be arranged on the mozzle spraying the side of wrapping, the outer peripheral edge of spray bag is provided with heater, and the lower end of spray bag is connected with nozzle, and the upper end of mozzle is communicated with the bottom of changeover portion, the bottom of changeover portion is Collapsible structure, and insulation bag is moved up and down; Vacuum drying oven and insulation bag are also provided with temperature and pressure measurement mechanism; Meanwhile, the middle part of changeover portion is provided with push-pull valve, when push-pull valve cuts out, vacuum drying oven and insulation bag is divided into two independently cavitys; When push-pull valve is opened, vacuum drying oven is communicated with insulation bag.This device is also provided with protective gas interface, for carrying protective gas to vacuum drying oven and insulation bag; In addition, the two ends of the crystallization roll of crystallization roll device are respectively arranged with the jet pipe for spraying weld pool protection gas, and the spout of jet pipe aims at nozzle both sides, and during spray band, weld pool protection gas can carry out protection against oxidation.The pressure roller for leading and the gas stripping device for high silicon steel thin belt being peeled off crystallization roll is provided with near the roll surface of crystallization roll.Strip automatic coiling apparatus also can be set so that high silicon steel thin belt is rolled into the roll coil of strip, and annealing furnace be set further annealing operation is carried out to the roll coil of strip.This device is a kind of exemplary device realizing the inventive method, should not be considered as the restriction to the inventive method, any similar, can realize the device of the inventive method all in category of the present invention.
Preferably, the method that described melt spinning prepares high silicon steel thin belt also comprises the steps: step 3) ~ 4) in chilling formed high silicon steel thin belt by after gas stripping crystallization roll, lead through pressure roller, capture online under the effect of strip automatic coiling apparatus and complete the coiling process of high silicon steel thin belt, obtaining high silicon steel thin belt and roll up.
Preferably, the method that described melt spinning prepares high silicon steel thin belt also comprises described high silicon steel thin belt is twisted in H
2or the step of annealing under Ar atmosphere, to improve strip magnetic.
Preferably, step 1) in, smelting temperature is 1450 ~ 1650 DEG C, and melting Absolute truth reciprocal of duty cycle is not higher than 10Pa.When melting completes, the degree of superheat >=50 DEG C of molten steel, reduce because silicone content increase causes molten steel thickness, cause spray nozzle clogging, not easily spray band; Molten steel temperature can not be too high simultaneously, avoids molten steel splash or have little time to cool at crystal roller surface
Preferably, step 1) in, before melting, one or several in interpolation B, Mn, Al, Ni are to improve the formability of high silicon steel, and the mass content of the one-component of B, Mn, Al or Ni of interpolation is not more than 0.4%.
Preferably, step 1) in, preheat temperature is 1400 ~ 1650 DEG C, due to temperature and molten steel close, can prevent molten steel from watering and be lowered the temperature to insulation bag.
Preferably, step 2) in, vacuum drying oven and the protective gas pressure be incubated in bag are 0.05 ~ 0.1MPa; Step 4) in, the protective gas pressure after increasing is 0.1 ~ 0.3MPa; Step 3) ~ 4) in, weld pool protective gas pressure >=0.3MPa.
Preferably, step 3) ~ 4) in, during spray band, the rotating speed of crystallization roll is 20m/s ~ 30m/s.
Preferably, in described annealing steps, annealing temperature is 650 ~ 1200 DEG C, and heat up with stove, temperature retention time is 5min ~ 60min.
Preferably, step 2) in, described protective gas and weld pool protection gas are Ar.
Preferably, step 3) ~ 4) spray band process in, the jet length of nozzle is 2mm; Spray angle is 90 °.
Preferably, in described high silicon steel foundry alloy, Si=6.3% ~ 6.7%, C≤0.2%, P≤0.4%, S≤0.1%, O≤0.2%, N≤0.2%, all the other are Fe.
The invention has the beneficial effects as follows: 1) after vacuum melting, molten steel is poured into the front and back process of insulation bag all under protective gas, prevents molten steel oxidation; 2) water after steel, strengthen protective gas pressure in insulation bag, make molten steel be full of along nozzle seam length direction and sprawl, improve spray band quality, increase bandwidth; 3) molten steel is sprayed onto on crystallization roll and is become band by chilling from nozzle, and this process completes under weld pool protective gas environment, guarantees spray band process non-oxidation; 4) the spray band formability made of the method is good, strip production board shape is good, bandwidth range is large, soft magnet performance good.
Accompanying drawing explanation
The vacuum melting list roller that the method that the melt spinning of Fig. 1 designed by the present invention prepares high silicon steel thin belt uses gets rid of the structural representation of belting.
Fig. 2 is that in Fig. 1, vacuum melting list roller gets rid of the A of the crystallization roll device of belting to structural representation.
Wherein: vacuum drying oven 1, insulation bag 2, push-pull valve 3, crystallization roll 4, spray bag 5, nozzle 6, gas stripping device 7, changeover portion 8, melting kettle 9, water conservancy diversion funnel 10, mozzle 11, jet pipe 12, pressure roller 13, strip automatic coiling apparatus 14, high silicon steel thin belt 15
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Fig. 1 ~ 2, the vacuum melting list roller that the method that melt spinning of the present invention prepares high silicon steel thin belt adopts gets rid of belting, the insulation bag 2 comprise vacuum drying oven 1, being communicated with by changeover portion 8 with vacuum drying oven 1, is arranged on the crystallization roll device be incubated below bag 2; Smelting apparatus and water conservancy diversion funnel 10 is provided with in vacuum drying oven 1, smelting apparatus comprises the support be fixed in vacuum drying oven 1 and the melting kettle 9 be arranged on support, water conservancy diversion funnel 10 is arranged on the below of melting kettle 9, and water conservancy diversion funnel 10 end is communicated with the top of changeover portion 8; The mozzle 11 being provided with spray bag 5 in insulation bag 2 and being arranged on above spray bag 5, the outer peripheral edge of spray bag 5 is provided with heater, and the lower end of spray bag 5 is connected with nozzle 6, and the upper end of mozzle 11 is communicated with the bottom of changeover portion 8, the bottom of changeover portion 8 is Collapsible structure, and insulation bag is moved up and down; Vacuum drying oven 1 and insulation bag 2 are also provided with temperature and pressure measurement mechanism; Meanwhile, the middle part of changeover portion 8 is provided with push-pull valve 3, when push-pull valve 3 cuts out, vacuum drying oven 1 and insulation bag 2 is divided into two independently cavitys; When push-pull valve 3 is opened, vacuum drying oven 1 is communicated with insulation bag 2.This device is also provided with protective gas interface, for carrying protective gas to vacuum drying oven 1 and insulation bag 2; In addition, the two ends of the crystallization roll 4 (copper roller) of crystallization roll device are respectively arranged with the jet pipe 12 for spraying weld pool protection gas, and the spout of jet pipe 12 aims at nozzle 6 both sides.The pressure roller 13 for leading and the gas stripping device 7 for high silicon steel thin belt 15 being peeled off crystallization roll is provided with near the roll surface of crystallization roll 4.The nozzle seam of nozzle 6 is of a size of: length 30 ~ 150mm, width 0.6mm.This device also comprises strip automatic coiling apparatus 14, and it is of a size of at the reel of wire reel-up: Φ 400 × 300mm.
Following present two embodiments that melt spinning of the present invention prepares the method for high silicon steel thin belt.
Embodiment 1
1) the high silicon steel foundry alloy of silicone content 6.5% is dropped in vacuum drying oven 1, add B, Mn, Al, Ni to improve the formability of high silicon steel, the mass content of the one-component of B, Mn, Al of adding is respectively 2.9%, 0.02%, 0.01%, carry out vacuum melting and obtain molten steel, smelting temperature is about 1580 DEG C, melting Absolute truth reciprocal of duty cycle 5Pa; Preheating insulation bag 2 to 1500 DEG C;
2) after melting completes, protective gas Ar to 0.1MPa is slowly passed in vacuum drying oven 1 and insulation bag 2, when vacuum drying oven 1 internal gas pressure is identical with insulation bag 2 internal gas pressure, open push-pull valve 3 between the two, by the operating position above insulation bag 2 entire lowering to crystallization roll 4; Open crystallization roll 4, the weld pool protection jet pipe 12 of gas and gas stripping off device 7, the stabilized (steady-state) speed of adjustment crystallization roll 4 is 25m/s, weld pool protective gas pressure 0.3MPa.
3) be poured onto by the molten steel that vacuum drying oven 1 melting obtains among the spray bag 5 in insulation bag 2, molten steel is formed strip because gravity and protective gas pressure start to flow out to from spray bag 5 bottom nozzle seam on the crystallization roll 4 of High Rotation Speed below nozzle 6 by chilling;
4) after molten steel is toppled over; close push-pull valve 3; in increasing insulation bag 2, protective gas pressure is to 0.2MPa; control molten steel in spray bag 5 is sprayed onto crystallization roll 4 until the spray end of tape from nozzle 6 quickly and evenly by pressure closed loop; due in spray band process; in spray bag, liquid level declines gradually, progressively should increase protective gas pressure to ensure to spray the even of band.
5) step 3) ~ 4) in, the high silicon steel thin belt 15 that during spray band, chilling is formed, by after gas stripping crystallization roll 4, leads through pressure roller 13, captures online and set up coiling tension rapidly through strip automatic coiling apparatus 14, guarantee strip production board shape, obtain high silicon steel thin belt volume.The drum speed of automatic coiling apparatus 14 is 25m/s
6) step 5) the high silicon steel thin belt that obtains twists in H
2or anneal under Ar atmosphere, annealing temperature is 670 DEG C, and heat up with stove, temperature retention time is 5min.
Good, the continuous uniform of high silicon steel tapability energy that the present embodiment obtains, surface is without hole.Saturation induction density Ms=1.79T after annealing, magnetic is good.
Embodiment 2
1) the high silicon steel foundry alloy of silicone content 6.5% is dropped in vacuum drying oven 1, add B content about 2.5%, Mn about 0.1%, Ni about 0.1%;
Carry out vacuum melting and obtain molten steel, smelting temperature is about 1530 DEG C, melting Absolute truth reciprocal of duty cycle 0.8Pa; Preheating insulation bag 2 to 1500 DEG C;
2) after melting completes, protective gas Ar to 0.12MPa is slowly passed in vacuum drying oven 1 and insulation bag 2, when vacuum drying oven 1 internal gas pressure is identical with insulation bag 2 internal gas pressure, open push-pull valve 3 between the two, by the operating position above insulation bag 2 entire lowering to crystallization roll 4; Open crystallization roll 4, the weld pool protection jet pipe 12 of gas and gas stripping off device 7, the stabilized (steady-state) speed of adjustment crystallization roll 4 is 30m/s, weld pool protective gas pressure 0.3MPa.
3) be poured onto by the molten steel that vacuum drying oven 1 melting obtains among the spray bag 5 in insulation bag 2, molten steel is formed strip because gravity and protective gas pressure start to flow out to from spray bag 5 bottom nozzle seam on the crystallization roll 4 of High Rotation Speed below nozzle 6 by chilling;
4) after molten steel is toppled over; close push-pull valve 3; in increasing insulation bag 2, protective gas pressure is to 0.2MPa; control molten steel in spray bag 5 is sprayed onto crystallization roll 4 until the spray end of tape from nozzle 6 quickly and evenly by pressure closed loop; due in spray band process; in spray bag, liquid level declines gradually, progressively should increase protective gas pressure to ensure to spray the even of band.
5) step 3) ~ 4) in, the high silicon steel thin belt 15 that during spray band, chilling is formed, by after gas stripping crystallization roll 4, leads through pressure roller 13, captures online and set up coiling tension rapidly through strip automatic coiling apparatus 14, guarantee strip production board shape, obtain high silicon steel thin belt volume.The drum speed of automatic coiling apparatus 14 is 30m/s
6) step 5) the high silicon steel thin belt that obtains twists in H
2or anneal under Ar atmosphere, annealing temperature is 1200 DEG C, and heat up with stove, temperature retention time is 60min.
Good, the continuous uniform of high silicon steel tapability energy that the present embodiment obtains, surface is without hole.Saturation induction density Ms=1.77T after annealing, magnetic is good.
Claims (10)
1. melt spinning prepares a method for high silicon steel thin belt, it is characterized in that, comprises the following steps:
1) molten steel is obtained by carrying out vacuum melting in high silicon steel foundry alloy input vacuum drying oven (1); Preheating insulation bag (2), the freezing point of the molten steel that its temperature is obtained higher than melting;
2) in vacuum drying oven (1) and insulation bag (2), protective gas is passed into malleation, when vacuum drying oven (1) internal gas pressure with insulation wrap (2) internal gas pressure close to time, open push-pull valve (3) between the two, by the operating position of insulation bag (2) entire lowering to crystallization roll (4) top, open crystallization roll (4) and weld pool protection gas;
3) molten steel that vacuum drying oven (1) melting obtains is poured onto among the spray bag (5) in insulation bag (2), open gas stripping device (7), molten steel start from spray bag (5) bottom nozzle seam flow out to nozzle (6) below rotate crystallization roll (4) formed strip by chilling;
4) after molten steel is toppled over; close push-pull valve (3); strengthen insulation bag (2) interior protective gas pressure, control spray bag (5) interior molten steel is sprayed onto crystallization roll (4) until the spray end of tape from nozzle (6) quickly and evenly by pressure closed loop.
2. melt spinning according to claim 1 prepares the method for high silicon steel thin belt, it is characterized in that, also comprise the steps: step 3) ~ 4) in chilling formed high silicon steel thin belt (15) by after gas stripping crystallization roll (4), lead through pressure roller (13), capture online under the effect of strip automatic coiling apparatus (14) and complete the coiling process of high silicon steel thin belt (15), obtaining high silicon steel thin belt and roll up.
3. melt spinning according to claim 2 prepares the method for high silicon steel thin belt, it is characterized in that: also comprise and described high silicon steel thin belt is twisted in H
2or the step of annealing under Ar atmosphere.
4. the melt spinning according to any one of claims 1 to 3 prepares the method for high silicon steel thin belt, it is characterized in that: step 1) in, smelting temperature is 1450 ~ 1650 DEG C, and melting Absolute truth reciprocal of duty cycle is not higher than 10Pa.
5. the melt spinning according to any one of claims 1 to 3 prepares the method for high silicon steel thin belt, it is characterized in that: step 1) in, before melting, one or several in interpolation B, Mn, Al, Ni are to improve the formability of high silicon steel, and the mass content of the one-component of B, Mn, Al or Ni of interpolation is not more than 0.4%.
6. the melt spinning according to any one of claims 1 to 3 prepares the method for high silicon steel thin belt, it is characterized in that: step 1) in, preheat temperature is 1400 ~ 1650 DEG C.
7. the melt spinning according to any one of claims 1 to 3 prepares the method for high silicon steel thin belt, it is characterized in that: step 2) in, the protective gas pressure that vacuum drying oven (1) and insulation are wrapped in (2) is 0.05 ~ 0.1MPa; Step 4) in, the protective gas pressure after increasing is 0.1 ~ 0.3MPa; Step 3) ~ 4) in, weld pool protective gas pressure >=0.3MPa.
8. the melt spinning according to any one of claims 1 to 3 prepares the method for high silicon steel thin belt, it is characterized in that: step 3) ~ 4) in, during spray band, the rotating speed of crystallization roll (4) is 20m/s ~ 30m/s.
9. melt spinning according to claim 3 prepares the method for high silicon steel thin belt, it is characterized in that: in described annealing steps, and annealing temperature is 650 ~ 1200 DEG C, and heat up with stove, temperature retention time is 5min ~ 60min.
10. the melt spinning according to any one of claims 1 to 3 prepares the method for high silicon steel thin belt, it is characterized in that: step 2) in, described protective gas and weld pool protection gas are Ar.
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| CN106957948A (en) * | 2017-04-19 | 2017-07-18 | 北京科技大学 | A kind of boron-containing high-silicon steel strip and preparation method thereof |
| CN108246994A (en) * | 2018-04-04 | 2018-07-06 | 乐山师范学院 | A kind of amorphous magnesium alloy process units |
| CN110923581A (en) * | 2019-11-26 | 2020-03-27 | 长春工业大学 | Method for preparing high-magnetic-induction non-oriented silicon steel based on pre-annealing |
| CN110923581B (en) * | 2019-11-26 | 2021-08-06 | 长春工业大学 | Method for preparing high-magnetic-induction non-oriented silicon steel based on pre-annealing |
| CN112846118A (en) * | 2021-01-05 | 2021-05-28 | 北京科技大学 | Method for preparing high-magnetic-performance phosphorus-containing silicon steel thin strip by using strip throwing method |
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| CN114029461A (en) * | 2021-10-13 | 2022-02-11 | 朗峰新材料(菏泽)有限公司 | Preparation facilities of high magnetic induction soft magnetic material amorphous ultra-thin area |
| CN114001168A (en) * | 2021-11-08 | 2022-02-01 | 沈阳真空技术研究所有限公司 | Large-drift-diameter combined type plugboard valve group of continuous vacuum furnace |
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