CN101049669A - Preparation method for cold rolling sheet of duriron - Google Patents
Preparation method for cold rolling sheet of duriron Download PDFInfo
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Abstract
A cold rolling method for preparing high-Si steel sheet containing Fe (85-96 Wt%) and Si (4-15) includes such steps as providing raw material containing Si, B and Fe, smelting, casting, forging, hot rolling, warm rolling, heat treating and cold rolling.
Description
Technical field
The invention belongs to technical field of metal material preparation, relate to a kind of cold rolling Preparation Method of boron-containing high-silicon steel.
Technical background
One class magnetically soft alloy of the silicon steel amount of being to use maximum, silicon content are generally 1.5～3.5% (weight ratios, down together).Be that electric power and telecommunication are industrial to make the important magnetic material of generator, motor, transformer, transformer, relay and other electrical instrumentation.
High silicon steel refers generally to silicon content and surpasses 3.5% silicon steel.Along with the increase of silicone content, the soft magnet performance of silicon steel improves, and shows the increase of resistivity and magnetic conductivity, the reduction of coercivity and magnetocrystalline anisotropy energy.When 6.5% silicone content, the performance of silicon steel performance is optimum.Nineteen twenty-eight Schulze finds the flexible constant (λ of the magnetic hysteresis of Fe-6.5%Si alloy
s) approach zero.Nineteen forty-two Ruder points out and Fe-3.5%Si alloy phase ratio, the magnetocrystalline anisotropy constant K of Fe-6.5%Si alloy
IAnd magnetostriction constant lambda
sLower, the electricalresistivity is higher, so iron loss P is lower.Proof such as Brown in 1964 Fe-6.5%Si monocrystal is than the P of Fe-3.5%Si monocrystal
15/50Low 0.2W/kg, λ
sLow by 90%, K
ILow 1/3.Thereby compare with common silicon steel, high silicon steel has the excellent magnetism energy, can obtain low iron loss and little magnetostriction, and to energy savings, reducing noise has important effect.
But along with the increase of Si content, the poor processability of ferro-silicium, 4.0%Si is generally the upper limit of silicon steel goods.Surpass this scope, occur the ordered phase of iron silicon in the alloy, improved the fragility of material greatly, thereby be difficult to produce high silicon steel plate with traditional milling method.Because high silicon steel has serious fragility, each developed country adopts special technology to prepare this latten in succession.Y.Takada is at Journal of Applied Physics, 64 (10): 5367-5369,1988, mention with CVD (Chemical Vapor Deposition) method among the Commercial scale production of Fe-6.5wt.%Si sheet and its magneticproperties and produce this alloy.This technology comprises two steps, and the first step is rolled certain thickness with common silicon steel earlier, and second step was carried out chemical meteorology deposition to this steel plate, at surface deposition silicon, carried out diffusion annealing then.Though this technology is mature on the whole, complex manufacturing, the production cycle is long, the production cost height, and raw materials used SiCl4 has pollution to environment.G.E.Fish etc. are at Journal of Applied Physics, and 64 (10): 5370,1988, report prepares this alloy thin band with rapid solidification method among the Frequency dependence of core loss inrapidly quenched Fe-6.5wt.%Si.Be characterized in directly getting rid of band, avoid its brittle zone, directly obtain thin and narrow alloy thin band by liquid alloy.But the size-constrained system of gained strip, thereby be unfavorable for large-scale production and application.T.Ros-Yanez etc. are at Journal of MaterialsProcessing Technology, 143-144:916-921,2003, report among the Production of high silicon steel forelectrical application by thermomechanical processing, prepare this alloy with traditional hot rolling cold rolling process.But before cold rolling, must adjust rolling direction, along hot rolling direction half-twist, promptly along hot rolled plate laterally carry out cold rollingly, thereby this technology also is not suitable for producing in enormous quantities this alloy.
Summary of the invention
The object of the present invention is to provide a kind of cold rolling Preparation Method of high silicon plate, the high silicon steel for siliceous 4～15% utilizes and forges, hot rolling, and warm-rolling, cold-rolling practice, in conjunction with corresponding Technology for Heating Processing, preparation 0.03～0.05mm strip.Strip has good plate shape, and the surface has metallic luster.This production technology has general applicability, can carry out on traditional milling train, does not need existing equipment is carried out big transformation.Simultaneously cold rolling direction is identical with the hot rolling direction, thereby hot rolled plate can continue cold rollingly along rolling direction, has kept the continuity of strip material.
Concrete technological process (referring to Fig. 1) is:
(1) raw material is prepared: with ingot iron (ingot iron DT0, iron content 99.5%), crystalline silicon (purity is 99.9%), ferro-boron (boracic 20.43%) is raw material, presses silicone content 4～15%, and the ratio of boron content 100～5000ppm is carried out proportioning and mixed;
(2) smelt: with intermediate frequency vacuum induction melting pure iron as raw material, silicon and ferro-boron, 1300～1530 ℃ of casting;
(3) forge: adopt pneumatic hammer freely to forge, at 1250 ℃～750 ℃ ingot casting is forged into the slab that thickness is 10～20mm, forging not only to provide the raw material shape that is suitable for hot rolling, and can broken crystal grain and field trash, improves the plasticity of material;
(4) hot rolling: 1250～500 ℃ of hot rolling to 1～2mm, dynamic recrystallization takes place, grain refinement in material generation moderate finite deformation simultaneously in this process;
(5) hot rolled plate heat treatment: after 700～1000 ℃ are incubated 1～3 hour, cool off in water or the salt solution.Heat treatment makes material take place to reply and crystallization again, eliminates work hardening, and quick cooling has reduced the degree of order of material.
(6) warm-rolling:, obtain the sheet material of 0.2～0.3mm at 700～150 ℃ of warm-rollings.Rolling below recrystallization temperature, obtain fibrous rolling structure, increase material plasticity.
(7) warm-rolling plate heat treatment: after 700～1000 ℃ are incubated 1～3 hour, cool off in water or the salt solution.This heat treatment is carried out under protective atmosphere, prevents the plate surface oxidation, influences follow-up cold rolling processing.Work hardening has been eliminated in this heat treatment, and cooling has reduced the degree of order of material fast;
(8) cold rolling: cold rolling under the room temperature, first reduction in pass is that 20～70%, second reduction in pass is 10～50%, and is cold rolling repeatedly afterwards, reaches 0.03～0.05mm until thickness.Through cold rolling, obtain sheet material as thin as a wafer, and sheet material plate shape is neat, surface quality is good, has metallic luster.
Warm-rolling plate of the present invention heat treatment is carried out in protective atmosphere, adopts under argon gas or the nitrogen and carries out.
Cold rolling first reduction in pass of the present invention is that 20～70%, second reduction in pass is 10～50%, and is cold rolling repeatedly afterwards, reaches 0.03～0.05mm until thickness.
The invention has the advantages that:
The present invention proposes to prepare with traditional milling method the technology of high silicon steel.And because the room temperature fragility of this material, this conventional method is considered to prepare high silicon steel before.Thereby utilize the method, and can utilize traditional forging machine and rolling mill to prepare this latten, have extensive applicability.And used raw material are simple, and purity is not high, have the low advantage of cost.
The ordered phase that has iron silicon in the high silicon steel, plasticity influence to material is very big, contained nonmetallic inclusion in the while material, bigger as carbon, oxygen, nitrogen etc. to the magnetic property influence of this material, thereby set about from each link of preparation technology, reduce the content of iron silicon ordered phase on the one hand, improve plasticity, reduce impurity content on the other hand, improve the magnetic property of alloy.
Take vacuum induction melting during smelting, can reduce impurity content, improve alloy plasticity and magnetic property.The adding of boron element can refinement cast sturcture crystal grain, and what guarantee to forge carries out smoothly.Forge and course of hot rolling, thin sheet material can be provided, and crystal grain thinning.The warm-rolling process is to realize cold rolling committed step, and the warm-rolling below recrystallization temperature can access the fibr tissue of elongation, improves the plasticity of material.The bigger drafts of first, second passage employing makes the atom erect-position that fierce reorganization take place when cold rolling, promotes the disordering of ordered alloy, utilizes the central distortion heat of large deformation process simultaneously, makes material temperature raise cold rolling can carrying out smoothly.And the proper heat treatment system of being taked in the middle of this preparation process not only can make material generation recovery and recrystallization, eliminates work hardening, improves plasticity, more can make alloy from the disordered state chilling, reduces the degree of order of alloy, has improved plasticity widely.
The present invention sets about research from raw material control, process route, can save cost, have the application value of reality, have other preparation method's incomparable advantage, have the soft magnet performance of excellence simultaneously owing to the high silicon steel of this kind, thereby have wide market application prospect.
Description of drawings
Fig. 1 is preparation technology's flow chart of the present invention.
Fig. 2 is a warm-rolling 0.3mm thin plate of the present invention.
Fig. 3 is a cold rolling 0.05mm thin plate of the present invention,
Fig. 4 is the crooked experiment of strip of the present invention.
The specific embodiment
4～15%, boron content utilizes rolling method at the high silicon steel of 100～5000ppm for silicone content, the preparation thin plate, and specific embodiment is as follows:
For siliceous 4.5%, the high silicon steel of boracic 200ppm is with intermediate frequency vacuum induction melting raw material, 1530 ℃ of cast temperatures.Ingot casting carries out flat-die forging subsequently, just forges 1200 ℃ of temperature, 900 ℃ of final forging temperatures, and ingot casting is taked the mode with the stove intensification, cracks to prevent thermal stress.
Forge the thick 20mm of back slab, carry out hot rolling subsequently, 1200 ℃ of hot rolling start rolling temperatures, 700 ℃ of finishing temperatures.Slab is hot-rolled down to 1.5mm.The gained hot rolled plate is through Overheating Treatment, and heat treatment temperature is 900 ℃, temperature retention time 1h, water cooling.
After the hot rolled plate pickling after the processing, surely roll, 500 ℃ of start rolling temperatures, 150 ℃ of finishing temperatures, drafts be every time 30%, obtain 0.3mm warm-rolling plate.
The warm-rolling plate is through 900 ℃, and 1h is incubated processing, water cooling, and the surface is carried out cold rolling after treatment.Cold rolling first passage, 40%, the second passage 30% constantly reduces roll gap subsequently, is cold-rolled to 0.05mm repeatedly.
For siliceous 5.8%, the high silicon steel of boracic 600ppm is with intermediate frequency vacuum induction melting raw material, 1500 ℃ of cast temperatures.Ingot casting carries out flat-die forging subsequently, 1200 ℃ of initial forging temperatures, and 850 ℃ of final forging temperatures, ingot casting is taked the mode with the stove intensification, cracks to prevent thermal stress.
Obtain the thick 20mm of slab after the forging, carry out hot rolling subsequently, 1200 ℃ of hot rolling start rolling temperatures, 650 ℃ of finishing temperatures, slab is hot-rolled down to 1.5mm.The gained hot rolled plate is through Overheating Treatment, and heat treatment temperature is 900 ℃, temperature retention time 2h, water cooling.
After the hot rolled plate pickling after the processing, carry out warm-rolling.650 ℃ of start rolling temperatures, 200 ℃ of temperature of finishing temperature, drafts be every time 25%, obtain 0.3mm warm-rolling plate.
The warm-rolling plate is through 850 ℃, and 1h is incubated processing, water cooling, and the surface is carried out cold rolling after treatment.Cold rolling first passage, 35%, the second passage 30% constantly reduces roll gap subsequently, is cold-rolled to 0.03mm repeatedly.
For siliceous 6.5%, the high silicon steel of boracic 1000ppm is with intermediate frequency vacuum induction melting raw material, 1480 ℃ of cast temperatures.Ingot casting carries out flat-die forging subsequently, and open and forge 1100 ℃ of temperature, 850 ℃ of final forging temperatures, the ingot casting of forging is taked the mode with the stove intensification, cracks to prevent thermal stress.
Obtain the thick 20mm of slab after the forging, carry out hot rolling subsequently, 1150 ℃ of hot rolling start rolling temperatures, 650 ℃ of finishing temperatures.Slab is hot-rolled down to 1mm.The gained hot rolled plate is through Overheating Treatment, and heat treatment temperature is 900 ℃, temperature retention time 2h, brine-cooled.
After the hot rolled plate pickling after the processing, carry out warm-rolling.650 ℃ of start rolling temperatures, 250 ℃ of finishing temperatures, drafts be every time 25%, obtain 0.3mm warm-rolling plate.The warm-rolling plate is through 900 ℃, and 1h is incubated processing, brine-cooled, and the surface is carried out cold rolling after treatment.
Cold rolling first passage, 40%, the second passage 30% constantly reduces roll gap subsequently, is cold-rolled to 0.03mm repeatedly.
For siliceous 7.5%, the high silicon steel of boracic 2000ppm is with intermediate frequency vacuum induction melting raw material, 1460 ℃ of cast temperatures.Ingot casting carries out flat-die forging subsequently, opens and forges 1100 ℃ of temperature, 800 ℃ of final forging temperatures.Ingot casting is taked the mode with the stove intensification, cracks to prevent thermal stress.
Obtain the thick 15mm of slab after the forging, carry out hot rolling subsequently, 1100 ℃ of hot rolling start rolling temperatures, 700 ℃ of finishing temperatures, slab is hot-rolled down to 1mm.The gained hot rolled plate is through Overheating Treatment, and heat treatment temperature is 900 ℃, temperature retention time 3h, brine-cooled.
After the hot rolled plate pickling after the processing, carry out warm-rolling.700 ℃ of start rolling temperatures, 300 ℃ of finishing temperatures, drafts be every time 25%, obtain 0.3mm warm-rolling plate.The warm-rolling plate is through 900 ℃, and 2h is incubated processing, brine-cooled, and the surface is carried out cold rolling after treatment.
Cold rolling first passage, 45%, the second passage 30% constantly reduces roll gap subsequently, is cold-rolled to 0.05mm repeatedly.
For siliceous 12%, the high silicon steel of boracic 4000ppm is with intermediate frequency vacuum induction melting raw material, 1400 ℃ of cast temperatures.Ingot casting carries out flat-die forging subsequently, and open and forge 1050 ℃ of temperature, 800 ℃ of final forging temperatures, the ingot casting of forging is taked the mode with the stove intensification, cracks to prevent thermal stress.
Obtain the thick 15mm of slab after the forging, carry out hot rolling subsequently, 1000 ℃ of hot rolling start rolling temperatures, 700 ℃ of finishing temperatures, slab is hot-rolled down to 1mm.The gained hot rolled plate is through Overheating Treatment, and heat treatment temperature is 900 ℃, temperature retention time 3h, brine-cooled.
After the hot rolled plate pickling after the processing, carry out warm-rolling.700 ℃ of start rolling temperatures, 400 ℃ of finishing temperatures, drafts be every time 25%, obtain 0.3mm warm-rolling plate.The warm-rolling plate is through 900 ℃, and 2h is incubated processing, brine-cooled, and the surface is carried out cold rolling after treatment.
Cold rolling first passage, 50%, the second passage 35% constantly reduces roll gap subsequently, is cold-rolled to 0.05mm repeatedly.
Claims (3)
1. the cold rolling Preparation Method of a high silicon plate, Fe content is 85～96% in the thin plate, Si content is 4～15%, all is weight percentage; Its technology is:
(1) raw material is prepared: ingot iron, crystalline silicon, ferro-boron are raw material, and the scope of the silicone content that obtain is 4～15%, and the content of boron is 100～5000ppm, and all the other are iron;
(2) smelt: with intermediate frequency vacuum induction melting pure iron as raw material, silicon and ferro-boron, 1300～1530 ℃ of casting;
(3) forge: at 1250 ℃～750 ℃ slabs that forge into thickness 10～20mm;
(4) hot rolling: 1250～500 ℃ of hot rolling to 1～2mm;
(5) hot rolled plate annealing: after 700～1000 ℃ are incubated 1～3 hour, cool off in water or the salt solution;
(6) warm-rolling:, obtain the sheet material of 0.2～0.3mm at 700～150 ℃ of warm-rollings;
(7) warm-rolling plate heat treatment: after 700～1000 ℃ are incubated 1～3 hour, cool off in water or the salt solution;
(8) cold rolling: cold rolling under the room temperature, obtaining thickness is the high silicon steel plate of 0.03～0.05mm;
2. the preparation method of high silicon steel according to claim 1 is characterized in that, the heat treatment of warm-rolling plate is carried out in protective atmosphere, adopts under argon gas or the nitrogen and carries out.
3. the preparation method of high silicon steel according to claim 1, cold rolling first reduction in pass is that 20～70%, second reduction in pass is 10～50%, and is cold rolling repeatedly afterwards, reaches 0.03～0.05mm until thickness.
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