CN1864879A - A method for making semi-processed cold rolled silicon steel in thin slab continuous casting and continuous rolling process - Google Patents

A method for making semi-processed cold rolled silicon steel in thin slab continuous casting and continuous rolling process Download PDF

Info

Publication number
CN1864879A
CN1864879A CNA2006100318081A CN200610031808A CN1864879A CN 1864879 A CN1864879 A CN 1864879A CN A2006100318081 A CNA2006100318081 A CN A2006100318081A CN 200610031808 A CN200610031808 A CN 200610031808A CN 1864879 A CN1864879 A CN 1864879A
Authority
CN
China
Prior art keywords
molten steel
steel
argon
slag
rolling
Prior art date
Application number
CNA2006100318081A
Other languages
Chinese (zh)
Other versions
CN100411758C (en
Inventor
吴光亮
郑柏平
焦国华
Original Assignee
湖南华菱涟源钢铁有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 湖南华菱涟源钢铁有限公司 filed Critical 湖南华菱涟源钢铁有限公司
Priority to CNB2006100318081A priority Critical patent/CN100411758C/en
Publication of CN1864879A publication Critical patent/CN1864879A/en
Application granted granted Critical
Publication of CN100411758C publication Critical patent/CN100411758C/en

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention relates to a method for using sheet blank continuous casting continuous rolling to produce silicon steel. In the BOF smelt process, it uses bottom argon blow technique in the whole processes; adds composite deoxidant and aluminum into steel pack when outputting steel to remove oxygen; adds manganese, silicon steel and ferro-phosphorus to alloy; blows argon to the melt steel in all process; uses LF furnace to refine the melt steel; using CSP continuous casting machine to cast the melt steel into casting blank; heats the casting blank via TF furnace to be rolled by continuous rolling machine to be hot rolling sheet coil; acid washes hot rolling plate to be cold rolled via rough roller cold rolling machine to be cold rolled sheet coil; anneals via the anneal furnace; flattens the annealed sheet coil via flatten machine group while the extending rate is 2-18%; corrects the sheet shape via correct machine; packs and stores the coil into the storehouse. The inventive method can reduce the cost of producing device and improve the additive value of sheet blank continuous casting continuous rolling product.

Description

A kind of method of making semi-processed cold rolled silicon steel in thin slab continuous casting and continuous rolling process
Technical field
The present invention relates to a kind of production method, relate in particular to the method that a kind of bar strip continuous casting and rolling flow path is produced the half technology cold rolled silicon steel that electromagnetic component uses.
Background technology
Half technology silicon steel belongs to low-carbon low-silicon cold rolled non-oriented electrical steel, it has lower iron loss, high magnetic induction intensity and good punching performance, the developed country such as the U.S. just begin to produce and use low-carbon low-silicon non-oriented half technology silicon steel as far back as the sixties in 20th century, this steel grade can not annealed or carry out partial annealing and be handled, more do not need coating to handle, the user can directly carry out punching and carry out that decarburizing annealing is handled and turn blue (insulating barrier) handled and can be come into the market according to the designing requirement of all kinds of electromagnetic components, it is simple that this product has a manufacturing process, low cost and other advantages, but utilize this product punching out to become various difform electromagnetic components to be used to make the little miniature motor of volume or transformer or other electric elements.The method of producing at present half technology silicon steel be adopt molten iron preliminary treatment-top and bottom combined blown converter-application of vacuum-heavy slab continuous casting-heating furnace heat again-roughing unit-tandem rolling unit-pickling-tandem rolling or single chassis be back and forth cold rolling-annealing-flattening process, this process technology maturation, equipment investment is big, process links is many but this flow process also exists, particularly strand heating again after cooling, the energy consumption height, problem such as the strand lumber recovery is low.
Summary of the invention
The object of the present invention is to provide and a kind ofly reduce investment outlay, reduce operation, reduce to consume and increase the CSP added value of product for making the production method of electromagnetic component with half technology cold rolled silicon steel.
For achieving the above object, the technical solution used in the present invention is: the technological process of adopting CSP (CSP) flow process to produce half technology cold rolled silicon steel, and soon blast-melted-converter smelting-LF stove refining-CSP continuous casting and rolling-pickling-cold continuous rolling or single chassis be back and forth cold rolling-and annealing-smooth-straightening-packing puts in storage.Pour the oxygen top and bottom combined blown converter into blast-melted, and be blended into steel scrap.Converter is opened and is taked low rifle bit manipulation when blowing (oxygen blast), adds slag former and flux, control finishing slag dual alkalinity.Converter smelting adopts omnidistance bottom argon blowing technology, Argon intensity 〉=0.03Nm 3/ mint SteelWhen treating that converter terminal molten steel composition and endpoint molten steel temperature meet the demands, decide the oxygen tapping.
In the converter tapping process, adopt the substep deoxidization technique: when converter tapping, in ladle, add double deoxidizer and metal aluminum blocks earlier, molten steel is carried out deoxidation just, and the addition of double deoxidizer and metal aluminum blocks needs to determine according to target oxygen content after molten steel terminal point dissolved oxygen and the deoxidation just.In ladle, add manganese metal and metallic silicon or ferrosilicon and antimony iron or terraced ingot, add ferrophosphorus according to phosphorus content in the molten steel.
Molten steel in the ladle is carried out omnidistance Argon, measure liquid steel temperature behind Argon 3~8min, decide oxygen, sampling, in molten steel, feed aluminum steel according to the molten steel oxygen content and carry out molten steel final deoxidizing and aluminium alloying, and keep Argon 2~10min.
Molten steel is sent into the LF refining station, after molten steel enters refining station, molten steel is stirred 1~2min with 300~800NL/min argon flow amount, so that change slag.Graphite electrode is inserted in the molten steel, and power supply heats up, while Argon in molten steel, and argon blowing rate remains on 100~400NL/min, Argon 4~10min; Argon blowing rate is 100~450NL/min during molten steel desulfurizing, Argon 4~10min.Argon blowing rate is 100~400NL/min when thermometric, sampling; Argon blowing rate is 200~600NL/min when feeding aluminum steel in molten steel, time 2~the 6min of Argon, Argon pressure is less than 1.5MPa, in the liquid steel refining process, in molten steel, add slag making material (as lime, synthetic slag, pre-molten slag or slag adjusting agent) slag making, carry out desulfurizing and refining and go to be mingled with processing, with dual alkalinity R (CaO/SiO in the slag 2) be controlled at 1.3~2.8 scopes, and make FeO+MnO in the slag<2.0%, departures molten steel [S]≤0.015%.Described low-carbon (LC) slag charge is a prior art, and product can be bought in market.
In the liquid steel refining later stage, carry out sample analysis, according to the sample analysis result molten steel is carried out the composition fine setting.
Middle Baogang water surface is adopted double-deck coverture, and lower floor adds the capacity alkaline covering agent, and the upper strata adds low-carbon (LC) or carbon-free acid coverture, and tundish adopts the constant weight operation.Molten steel adopts long nozzle cast, argon shield from the big tundish that wraps, and tundish molten steel face height is greater than 750mm, and the tundish molten steel overheat is controlled at 15~40 ℃, adopts the casting of low-carbon (LC) or carbon-less protecting slag.
By the CSP conticaster molten steel is cast the continuous casting billet of required section, the thin-slab caster pulling rate is 2.5~4.8m/min.Select and set cooling curve according to pulling rate, strand limit portion temperature when guaranteeing that continuous casting billet is gone into the TF heating furnace 〉=900 ℃, slab charging temperature 〉=900 ℃, 1020~1250 ℃ of start rolling temperatures.
Continuous casting billet rolls into hot-rolled sheet coil, F by 5~7 frame hot continuous rolling units after the dephosphorization of dephosphorization machine 1, F 2The frame drafts is greater than 40%, F 7Drafts is less than 30%, and finishing temperature is 780~930 ℃, and coiling temperature is 580~720 ℃.
Carry out pickling processes after the hot-rolled sheet coil cooling, remove the impurity and the iron scale on hot-rolled sheet coil surface, pickle concentration is 2~25%, and the descaling bath acid liquor temperature is 70~120 ℃, and pickling medium is a hydrochloric acid, and the pickling time is 10~180 seconds.
Hot-rolled sheet coil after the pickling is through the reciprocal cold rolling cold rolled strip coil of making of texturing roller tandem mills or single chassis, cold rolling employing tension-rolling, and unit tension is controlled at 3.0~7.5kg/mm 2Cold rolled strip coil is through bell furnace or continuous annealing furnace annealing, and the annealing cold-point temperature is 550~700 ℃, and the cold rolled strip coil after the annealing carries out the straightening bundling after the smooth extension of 2~18% percentage elongation, the packing warehouse-in.
The method that adopts a kind of making semi-processed cold rolled silicon steel in thin slab continuous casting and continuous rolling process that as above technical scheme provides compared with prior art, its effective effect is:
1. reduce equipment investment and process links, save equipment investment 20~30%;
2. utilize CSP equipment and technology production half technology cold rolled silicon steel, flow process is short, and energy consumption reduces by 30~60%, and lumber recovery improves 5~10%;
3. increase CSP added value of product 20~45%;
4. reduce the product import, capture the domestic market, save the foreign exchange expenditure.
The specific embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is described in further detail.
Adopt the converter of oxygen top bottom blowing to smelt.Pour the converter of oxygen top bottom blowing into blast-melted, i.e. BOF converter is blended into the steel scrap that accounts for gross weight 0~20% simultaneously in the converter stove, from furnace roof oxygen blast in stove, can adopt low rifle bit manipulation, and the quick decarburization in molten bath is heated up, and reduces dephosphorization of molten iron.Add slag former such as lime and flux such as dolomite, fluorite etc. in converting process in the converter stove, the addition of slag former is with finishing slag dual alkalinity R (CaO/SiO 2)=1.5~4.0 are controlled, and control the addition of dolomite, fluorite from the mobile degree of bits.
Omnidistance bottom argon blowing technology is adopted in converter, BOTTOM ARGON BLOWING intensity 〉=0.03Nm 3/ mint SteelWhen molten steel terminal point composition satisfies following requirement: when [C]≤0.02%, [P]≤0.035%, [S]≤0.015% and endpoint molten steel temperature are 1650~1700 ℃, decide the oxygen tapping.
In the converter tapping process, adopt the substep deoxidization technique: when converter tapping, in ladle, add double deoxidizer such as calcium-silicon, barium silicon alloy, silicon-aluminium-barium alloy, calsibar alloy and metal aluminum blocks earlier molten steel is carried out deoxidation just, can determine the addition of double deoxidizer and metal aluminum blocks according to molten steel oxygen content after molten steel oxygen that terminal point is decided and the deoxidation just, generally to guarantee after the molten steel deoxidation just in the molten steel that dissolved oxygen content is 10~250ppm (do not seethe be advisable with a molten steel), the adding total amount of double deoxidizer is 0.20~2.50kg/t Molten steel, metal aluminum blocks addition be 0.10~3.50kg/t Molten steelAnd then in molten steel, add 0.5~4.5kg/t SteelManganese metal makes [Mn]=0.20~0.50% in the molten steel, adds 2.0~5.0kg/t then in molten steel Molten steelFerrosilicon or add 0.5~3.5kg/t Molten steelMetallic silicon.Add ferrophosphorus according to phosphorus content in the molten steel and make [P]≤0.035% in the molten steel, in molten steel, add antimony slab or antimony iron, make [Sb]=0.01~0.02% in the molten steel.Adding manganese metal, ferrosilicon or metallic silicon, ferrophosphorus, antimony slab or antimony iron in molten steel is molten steel is carried out Alloying Treatment.
In the converter tapping process molten steel is carried out omnidistance Argon, Argon pressure is not advisable so that top of the slag fine motion, molten steel are exposed.Measure liquid steel temperature behind Argon 3~8min, decide oxygen, sampling, and in molten steel, feed aluminum steel according to oxygen content in the molten steel, make sour molten aluminium [Als]=0.02~0.06% in the molten steel.Described aluminum steel is a prior art, and product can be bought in market, and the purpose of feeding aluminum steel is molten steel is carried out final deoxidizing and molten steel is carried out the aluminium alloying processing.Maintenance is to molten steel Argon 2~10min.
After the processing of molten steel Argon finishes, molten steel is sent into the LF refining station molten steel is carried out refining.At first molten steel was stirred 1~2 minute, so that change slag with 300~800NL/min argon flow amount.Graphite electrode is inserted in the molten steel, and power supply heats up, and supply voltage is optional from exchanging 240~290 volts, optional 36~38 kilo-amperes that exchange certainly of supply current.Blowing argon gas in refining furnace, argon blowing rate remains on 100~400NL/min, and argon blowing time 4~10min, Argon pressure are 0.2~0.5MPa.When molten steel was carried out desulfurization, argon blowing rate can suitably strengthen, and as 100~450NL/min, argon blowing time 4~10min, Argon pressure are 0.2~0.5MPa, and liquid steel temperature is controlled at 1600~1610 ℃; Argon blowing rate is controlled at 100~400NL/min when measuring liquid steel temperature and sample analysis, and argon blowing rate remains on 200~600NL/min when feeding aluminum steel in molten steel, and described aluminum steel can be bought product for prior art market.And then Argon 2~6min, Argon pressure is less than 1.5MPa.
In the liquid steel refining process, molten steel can not turn over greatly, forbids molten steel to be exposed in the air in case molten steel increases [O] and increases [N].
Add the slag making of slag making material in the liquid steel refining process in molten steel, the optional lime of described slag making material, synthetic slag, pre-molten slag and slag adjusting agent are market and can buy product.For guaranteeing that refining slag has good flowability and reproducibility, can be according to the sulfur content in slag condition and the molten steel 1: 1: 1 by weight: 1 adds lime, synthetic slag, pre-solvent or slag adjusting agent simultaneously in molten steel carries out residue adjustment.A kind of in the optional autoxidation calcium of described synthetic slag, calcium carbonate, magnesia, magnesium carbonate, the aluminium oxide or several combination in them, the calcium aluminate slag charge of the optional self-contained metallic aluminium of slag adjusting agent, pre-molten slag is optional from the calcium aluminate slag charge through roasting, and its addition can be from control bits dual alkalinity R (CaO/SiO 2FeO+MnO in)=1.3~2.8, the slag<2.0% is determined, the molten steel [S]≤0.015% of guaranteeing to set off.And molten steel carried out sample analysis, add corresponding alloy according to the sample analysis result and carry out the composition fine setting, make [Si]=0.2~1.0% in the molten steel, [Mn]=0.20~0.0%, [P]=0.02~0.07%, [Sb]=0.01~0.06%, [Als]=0.04~0.30%.
Adopt sheet billet (CSP) casting and rolling process; molten steel adopts long nozzle, argon shield from the big tundish that wraps; the tundish molten steel surface adopts double-deck coverture; lower floor adds alkaline covering agent; the upper strata adds low-carbon (LC) or carbon-free acid coverture, follows the tracks of the speed that the slag bar forms in the casting process simultaneously and in time pulls the slag bar out.Tundish molten steel face height is greater than 750 millimeters, and the tundish molten steel overheat is controlled at 15~40 ℃.Adopt the casting of low-carbon (LC) or carbon-less protecting slag, described alkaline covering agent, low-carbon (LC) or carbon-free acid coverture and low-carbon (LC) or carbon-less protecting slag are prior art.
Molten steel is cast the continuous casting billet of required specification through thin-slab caster, the thin-slab caster pulling rate is 2.5~4.8m/min, and select and set the continuous casting billet cooling curve according to pulling rate, strand limit portion temperature when guaranteeing that continuous casting billet is gone into the TF heating furnace 〉=900 ℃, strand charging temperature 〉=900 ℃, start rolling temperature are 1020~1250 ℃.
Continuous casting billet rolls into hot-rolled sheet coil by 5~7 frame hot continuous rolling units after the dephosphorization of dephosphorization machine, optimize each reduction in pass of hot continuous rolling unit: F 1, F 2Frame drafts 〉=40%, F 7Frame drafts<30%, finishing temperature are 780~930 ℃, and coiling temperature is 580~720 ℃.
After hot-rolled sheet coil is cooled to below 80 ℃, through pickling tandem rolling line tandem rolling.Pickle can be selected hydrochloric acid solution for use, and the concentration of pickle is 2~25%, and the descaling bath acid liquor temperature is 70~120 ℃, and the pickling time is 10~180 seconds, to remove the impurity and the iron scale on hot-rolled sheet coil surface.
With the hot-rolled sheet coil after the pickling through the reciprocal cold rolling cold rolled strip coil of making of texturing roller tandem mills or single chassis, cold rolling employing tension-rolling, unit tension is controlled at 3.0~7.5kg/mm 2Cold rolled strip coil is through bell furnace or annealing furnace annealing, and the annealing cold-point temperature is controlled at 550~700 ℃.Cold rolled strip coil after the annealing carries out smooth processing through the smooth unit of 2~18% percentage elongation, carries out straightening bundling (being that plate shape is proofreaied and correct), packing warehouse-in with withdrawal straightening stands then.
Embodiment 1
Pour the converter of oxygen top bottom blowing into blast-melted, in the converter stove, be blended into the steel scrap that accounts for gross weight 10% simultaneously.In converting process, in the converter stove, add lime and dolomite, fluorite, make finishing slag dual alkalinity R=2.8; Omnidistance bottom argon blowing technology is adopted in converter, BOTTOM ARGON BLOWING intensity 〉=0.03Nm 3/ min.t SteelWhen molten steel terminal point composition [C]≤0.02%, [P]≤0.035%, [S]≤0.015% and Molten Steel End Point are 1650 ℃, decide the oxygen tapping; When converter tapping, in ladle, add 1.2kg/t earlier Molten steelDouble deoxidizer such as barium-silicon alloy and 1.8kg/t Molten steelMetal aluminum blocks is carried out deoxidation just to molten steel, after the molten steel deoxidation just, makes that dissolved oxygen content is 100ppm in the molten steel; Then in molten steel, add 2.5kg/t Molten steelManganese metal makes [Mn]=0.35% in the molten steel, adds 2.0kg/t in molten steel Molten steelFerrosilicon adds ferrophosphorus and makes [P]≤0.035% in the molten steel, adds antimony iron at last, makes [Sb]=0.015%.In the converter tapping process, molten steel is carried out omnidistance Argon, measure liquid steel temperature behind the Argon 5min, decide oxygen, sampling, in molten steel, feed aluminum steel according to oxygen content in the molten steel and make [Als]=0.04% in the molten steel, keep Argon 6min.Molten steel is sent into the LF refining station, molten steel was stirred 1 minute with the 600NL/min argon flow amount.Graphite electrode is inserted in the molten steel, and power supply heats up, and simultaneously with flow 200NL/min Argon, argon blowing time 6min, Argon pressure are 0.3MPa; Argon blowing rate is 300NL/min when molten steel is carried out desulfurization, and argon blowing time 6min, Argon pressure are 0.3MPa; Argon blowing rate is 300NL/min when measuring liquid steel temperature and sample analysis, and argon blowing rate is 400NL/min when feeding aluminum steel in molten steel, argon blowing time 6min, Argon pressure<1.5MPa.In the liquid steel refining process in 1: 1: 1: 1 ratio adds simultaneously lime, calcium oxide, pre-molten slag or slag adjusting agent in molten steel, make FeO+MnO<2.0% in bits dual alkalinity R=2.0, the slag, departures molten steel [S]<0.015%, molten steel is carried out sample analysis, according to analysis result, add corresponding alloy and carry out the composition fine setting, make [Si]=0.2% in the molten steel, [Mn]=0.6%, [P]=0.05%, [Als]=0.15%, [S]<0.015%.Molten steel adopts long nozzle, argon shield from the big tundish that wraps, and the tundish molten steel surface adopts double-deck coverture, and lower floor adds alkaline covering agent, and the upper strata adds carbon-free acid coverture.Tundish molten steel face height is greater than 750 millimeters, and the tundish molten steel overheat is controlled at 35 ℃, adopts the low carbon protective slag casting.Molten steel is cast continuous casting billet through thin-slab caster, and the conticaster pulling rate is 3.5m/min, strand limit portion temperature when continuous casting billet is gone into the TF heating furnace 〉=900 ℃, strand charging temperature 〉=900 ℃, 1130 ℃ of start rolling temperatures.Continuous casting billet rolls into hot-rolled sheet coil, F by 7 frame hot continuous rolling units after the dephosphorization of dephosphorization machine 1, F 2The frame drafts is 48%, F 7The frame drafts is 25%, and finishing temperature is 850 ℃, and coiling temperature is 650 ℃.Hot-rolled sheet coil is cooled to below 80 ℃ after 15% hydrochloric acid solution carries out pickling, and the descaling bath acid liquor temperature is 95 ℃, and the pickling time is 100 seconds, to remove the impurity and the iron scale on coiled sheet surface.With the coiled sheet after the pickling through the cold rolling one-tenth cold rolled strip coil of texturing roller tandem mills, cold rolling employing tension-rolling, unit tension is 5.0kg/mm 2, cold rolled strip coil is through cover annealing, and the annealing cold-point temperature is 625 ℃, and the cold rolled strip coil after the annealing is through the smooth processing of 10% percentage elongation, straightening bundling.
The half technology cold rolled silicon steel that the method is produced, iron loss are less than 6.5w/kg, and magnetic conductivity is greater than 2000, and the user is directly used on the electromagnetic components such as small machine and transformer after the decarburizing annealing after the punching and the processing of turning blue, and cost reduces by 213 yuan/ton than traditional handicraft.
Embodiment 2
Pour the converter of oxygen top bottom blowing into blast-melted, in the converter stove, be blended into the steel scrap that accounts for gross weight 20% simultaneously.In converting process, in the converter stove, add lime and dolomite, fluorite, make finishing slag dual alkalinity R=1.5; Omnidistance bottom argon blowing technology is adopted in converter, BOTTOM ARGON BLOWING intensity 〉=0.03Nm 3/ min.t SteelWhen molten steel terminal point composition [C]≤0.02%, [P]≤0.035%, [S]≤0.015% and Molten Steel End Point are 1680 ℃, decide the oxygen tapping; When converter tapping, in ladle, add 2.5kg/t earlier Molten steelDouble deoxidizer such as calcium-silicon and 0.2kg/t Molten steelMetal aluminum blocks is carried out deoxidation just to molten steel, after the molten steel deoxidation just, makes that dissolved oxygen content is 225ppm in the molten steel; Then in molten steel, add 0.6kg/t Molten steelManganese metal makes [Mn]=0.20% in the molten steel, adds 3.5kg/t in molten steel Molten steelFerrosilicon adds ferrophosphorus and makes [P]≤0.035% in the molten steel, adds antimony iron and makes [Sb]=0.015% in the molten steel.In the converter tapping process, molten steel is carried out omnidistance Argon, survey liquid steel temperature behind the Argon 8min, decide oxygen, sampling, in molten steel, feed aluminum steel according to oxygen content in the molten steel and make [Als]=0.06% in the molten steel, keep Argon 10min.Molten steel is sent into the LF refining station, molten steel is stirred 1.5min with the 800NL/min argon flow amount.Graphite electrode is inserted in the molten steel, and power supply heats up, and simultaneously with flow 400NL/min Argon, argon blowing time 4min, Argon pressure are 0.2MPa; Argon blowing rate is 450NL/min when molten steel is carried out desulfurization, argon blowing time 4 minutes, and Argon pressure is 0.5MPa; Argon blowing rate is 100NL/min when measuring liquid steel temperature and sample analysis; Argon blowing rate remains on 200NL/min, argon blowing time 4 minutes, Argon pressure<1.5MPa when feeding aluminum steel in molten steel.In the liquid steel refining process in 1: 1: 1: 1 ratio adds simultaneously lime, calcium carbonate, pre-molten slag or slag adjusting agent in molten steel, make FeO+MnO<2.0% in bits dual alkalinity R=1.3, the slag, departures molten steel [S]<0.015%.Molten steel is carried out sample analysis,, add corresponding alloy and carry out the composition fine setting, make [Si]=0.6% in the molten steel, [Mn]=0.20%, [P]=0.07%, [Als]=0.30%, [Sb]=0.06%, [S]<0.015% according to analysis result.Molten steel adopts long nozzle, argon shield from the big tundish that wraps, and the tundish molten steel surface adopts double-deck coverture, and lower floor adds alkaline covering agent, and the upper strata adds carbon-free acid coverture.Tundish molten steel face height is greater than 750 millimeters, and the tundish molten steel overheat is controlled at 40 ℃, adopts the low carbon protective slag casting.It is bad that molten steel is cast continuous casting through thin-slab caster, and the thin-slab caster pulling rate is 2.5m/min, strand limit portion temperature when continuous casting billet is gone into the TF heating furnace 〉=900 ℃, strand charging temperature 〉=900 ℃; 1020 ℃ of start rolling temperatures.Continuous casting billet rolls into hot-rolled sheet coil, F by 6 frame hot continuous rolling units after the dephosphorization of dephosphorization machine 1, F 2The frame drafts is 42%, F 7The frame drafts is 20%; Finishing temperature is 780 ℃, and coiling temperature is 580 ℃.Hot-rolled sheet coil is cooled to below 80 ℃ after 2% hydrochloric acid solution carries out pickling, and the descaling bath acid liquor temperature is 120 ℃, and the pickling time is 10 seconds, to remove the impurity and the iron scale on coiled sheet surface.With the hot-rolled sheet coil after the pickling through the cold rolling one-tenth cold rolled strip coil of texturing roller tandem mills, cold rolling employing tension-rolling, unit tension is 7.5kg/mm 2, cold rolled strip coil is through cover annealing, and the annealing cold-point temperature is 700 ℃, and the cold rolled strip coil after the annealing is through the smooth processing of 18% percentage elongation, straightening bundling.
The half technology cold rolled silicon steel that the method is produced, iron loss is less than 6.7w/kg, and magnetic conductivity is greater than 2100, and the user is directly used on the electromagnetic components such as small machine and transformer after the decarburizing annealing after the punching and the processing of turning blue, various performances are all good, and cost reduces by 215 yuan/ton than traditional handicraft.
Embodiment 3
Pour the converter of oxygen top bottom blowing into blast-melted, adopt full molten iron smelting, do not add steel scrap, in converting process, in the converter stove, add lime and dolomite, fluorite, make finishing slag dual alkalinity R=4.0; Omnidistance bottom argon blowing technology is adopted in converter, BOTTOM ARGON BLOWING intensity 〉=0.03Nm 3/ min.t SteelWhen molten steel terminal point composition [C]≤0.02%, [P]≤0.035%, [S]≤0.015% and Molten Steel End Point are 1700 ℃, decide the oxygen tapping; When converter tapping, in ladle, add 0.20kg/t earlier Molten steelDouble deoxidizer such as Alsical and 3.5kg/t Molten steelMetal aluminum blocks is carried out deoxidation just to molten steel, and after the molten steel deoxidation just, dissolved oxygen content is 30ppm in the molten steel; Then, in molten steel, add 4.5kg/t Molten steelManganese metal makes [Mn]=0.50% in the molten steel, adds 5.0kg/t in molten steel Molten steelFerrosilicon adds ferrophosphorus and makes [P]≤0.015% in the molten steel, adds antimony slab and makes [Sb]=0.02% in the molten steel.In the converter tapping process, molten steel is carried out omnidistance Argon, survey liquid steel temperature behind the Argon 3min, decide oxygen, sampling, in molten steel, feed aluminum steel according to oxygen content in the molten steel and make [Als]=0.02% in the molten steel, keep Argon 2min.Molten steel is sent into the LF refining station, molten steel is stirred 2min with the 300NL/min argon flow amount.Graphite electrode is inserted in the molten steel, and power supply heats up, and simultaneously with flow 100NL/min Argon, argon blowing time 10min, Argon pressure are 0.50MPa; Argon blowing rate is 100NL/min when molten steel is carried out desulfurization, and argon blowing time is 10min, and Argon pressure is 0.20MPa; Argon blowing rate is 400NL/min when measuring liquid steel temperature and sample analysis, and argon blowing rate remains on 600NL/min, argon blowing time 2min, Argon pressure<1.5MPa when feeding aluminum steel in molten steel.In the liquid steel refining process in 1: 1: 1: 1 ratio adds simultaneously lime, magnesia, pre-molten slag or slag adjusting agent in molten steel, make FeO+MnO<2.0% in bits dual alkalinity R=2.8, the slag, departures molten steel [S]<0.015%, molten steel is carried out sample analysis, add corresponding alloy according to analysis result and carry out the composition fine setting, make [Si]=1.0% in the molten steel, [Mn]=0.80%, [P]=0.02%, [Als]=0.04%, [Sb]=0.04%, [S]<0.015%.Molten steel adopts long nozzle, argon shield from the big tundish that wraps, and the tundish molten steel surface adopts double-deck coverture, and lower floor adds alkaline covering agent, and the upper strata adds the acid coverture of low-carbon (LC).Tundish molten steel face height is greater than 750 millimeters, and the tundish molten steel overheat is controlled at 15 ℃, adopts the carbon-less protecting slag casting.Molten steel is cast continuous casting billet through thin-slab caster, and the thin-slab caster pulling rate is 4.8m/min, strand limit portion temperature when continuous casting billet is gone into the TF heating furnace 〉=900 ℃, strand charging temperature 〉=900 ℃; 1250 ℃ of start rolling temperatures.Continuous casting billet rolls into hot-rolled sheet coil, F by 5 frame hot continuous rolling units after the dephosphorization of dephosphorization machine 1, F 2The frame drafts is 52%, F 7The frame drafts is 18%; Finishing temperature is 930 ℃, and coiling temperature is 720 ℃.Hot-rolled sheet coil is cooled to below 80 ℃ after 25% hydrochloric acid solution carries out pickling, the descaling bath acid liquor temperature is 70 ℃, the pickling time is 180 seconds, to remove the impurity and the iron scale on coiled sheet surface, hot-rolled sheet coil after the pickling back and forth is rolled into cold rolled strip coil through single chassis, cold rolling employing tension-rolling, unit tension is controlled at 3.0kg/mm 2, cold rolled strip coil is through the continuous annealing furnace annealing, and the annealing cold-point temperature is 550 ℃, and the cold rolled strip coil after the annealing is through the smooth processing of 2% percentage elongation, straightening bundling.
The half technology cold rolled silicon steel that the method is produced, iron loss is less than 6.35w/kg, and magnetic conductivity is greater than 1950, and the user is directly used on the electromagnetic components such as small machine and transformer after the decarburizing annealing after the punching and the processing of turning blue, various performances are all good, and cost reduces by 195 yuan/ton than traditional handicraft.

Claims (1)

1, a kind of method of making semi-processed cold rolled silicon steel in thin slab continuous casting and continuous rolling process, pour the converter of oxygen top bottom blowing into blast-melted, in the converter stove, be blended into simultaneously the steel scrap that accounts for gross weight 0~20%, it is characterized in that: in converting process, in the converter stove, add slag former and solvent, make finishing slag dual alkalinity R=1.5~4.0; Omnidistance bottom argon blowing technology is adopted in converter, BOTTOM ARGON BLOWING intensity 〉=0.03Nm 3/ mint SteelWhen molten steel terminal point composition [C]≤0.02%, [P]≤0.035%, [S]≤0.015% and Molten Steel End Point are 1650~1700 ℃, decide the oxygen tapping, when converter tapping, in ladle, add 0.20~2.50kg/t earlier Molten steelDouble deoxidizer and 0.10~3.50kg/t Molten steelMetal aluminum blocks is carried out deoxidation just to molten steel, after the molten steel deoxidation just, makes that dissolved oxygen content is 10~250ppm in the molten steel; In molten steel, add 0.5~4.5kg/t Molten steelManganese metal makes [Mn]=0.20~0.50% in the molten steel; In molten steel, add 2.0~5.0kg/t Molten steelFerrosilicon or 0.5~3.5kg/t Molten steelMetallic silicon; Add ferrophosphorus according to phosphorus content in the molten steel and make [P]≤0.035% in the molten steel, add antimony slab or antimony iron and make [Sb]=0.01~0.02% in the molten steel; In the converter tapping process, molten steel is carried out omnidistance Argon, measure liquid steel temperature behind Argon 3~8min, decide oxygen, sampling, in molten steel, feed aluminum steel according to oxygen content in the molten steel and make [Als]=0.02~0.06% in the molten steel, keep Argon 2~10min; Molten steel is sent into the LF refining station, molten steel is stirred 1~2min, graphite electrode is inserted in the molten steel with 300~800NL/min argon flow amount, power supply heats up, with flow 100~400NL/min Argon, argon blowing time 4~10min, Argon pressure are 0.2~0.5MPa simultaneously; Argon blowing rate is 100~450NL/min when molten steel is carried out desulfurization, and argon blowing time 4~10min, Argon pressure are 0.2~0.5MPa; Argon blowing rate is controlled at 100~400NL/min when measuring liquid steel temperature and sample analysis, and argon blowing rate remains on 200~600NL/min when feeding aluminum steel in molten steel, argon blowing time 2~6min, and Argon pressure is less than 1.5MPa; In the liquid steel refining process in 1: 1: 1: 1 ratio adds simultaneously lime, synthetic slag, pre-molten slag or slag adjusting agent in molten steel, make FeO+MnO<2.0% in bits dual alkalinity R=1.3~2.8, the slag, departures molten steel [S]<0.015%; Molten steel is carried out sample analysis, according to the sample analysis result, add corresponding alloy and carry out the fine setting of molten steel composition, make [Si]=0.2~1.0% in the molten steel, [Mn]=0.20~0.80%, [P]=0.02~0.07%, [Als]=0.04~0.30%, [Sb]=0.02~0.06%; Molten steel adopts long nozzle, argon shield from the big tundish that wraps, the tundish molten steel surface adopts double-deck coverture, lower floor adds alkaline covering agent, the upper strata adds low-carbon (LC) or first carbonic acid coverture, tundish molten steel face height is greater than 750 millimeters, the tundish molten steel overheat is controlled at 15~40 ℃, adopts the casting of low carbon protective slag or carbon-less protecting slag; Molten steel is cast continuous casting billet through thin-slab caster, and the thin-slab caster pulling rate is 2.5~4.8m/min, strand limit portion temperature when continuous casting billet is gone into the TF heating furnace 〉=900 ℃, and strand charging temperature 〉=900 ℃, start rolling temperature is 1020~1250 ℃; Continuous casting billet rolls into hot-rolled sheet coil, F by 5~7 frame hot continuous rolling units after the dephosphorization of dephosphorization machine 1, F 2Frame drafts>40%, F 7Frame drafts<30%; Finishing temperature is 780~930 ℃, and coiling temperature is 580~720 ℃; Hot-rolled sheet coil is cooled to below 80 ℃ that the back is 2~25% at acid strength, the descaling bath acid liquor temperature is pickling 10~180 seconds in 70~120 ℃ the hydrochloric acid solution, with the hot-rolled sheet coil after the pickling through the reciprocal cold rolling cold rolled strip coil of making of texturing roller tandem mills or single chassis, cold rolling employing tension-rolling, unit tension is controlled at 3.0~7.5kg/mm 2, cold rolled strip coil is through bell furnace or continuous annealing furnace annealing, and the annealing cold-point temperature is 550~700 ℃, and the cold rolled strip coil after the annealing is through the smooth processing of 2~18% percentage elongation, straightening bundling; Wherein
Double deoxidizer is selected from: a kind of in calcium-silicon, barium silicon alloy, silicon-aluminium-barium alloy, the calsibar alloy,
Synthetic slag is selected from: a kind of in calcium oxide, calcium carbonate, magnesia, magnesium carbonate, the aluminium oxide,
Slag adjusting agent is selected from: the calcium aluminate slag charge of containing metal aluminium,
Pre-molten slag is selected from: through the calcium aluminate slag charge of roasting,
Slag former is selected from: lime,
Solvent is selected from: dolomite, fluorite.
CNB2006100318081A 2006-06-06 2006-06-06 A method for making semi-processed cold rolled silicon steel in thin slab continuous casting and continuous rolling process CN100411758C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2006100318081A CN100411758C (en) 2006-06-06 2006-06-06 A method for making semi-processed cold rolled silicon steel in thin slab continuous casting and continuous rolling process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2006100318081A CN100411758C (en) 2006-06-06 2006-06-06 A method for making semi-processed cold rolled silicon steel in thin slab continuous casting and continuous rolling process

Publications (2)

Publication Number Publication Date
CN1864879A true CN1864879A (en) 2006-11-22
CN100411758C CN100411758C (en) 2008-08-20

Family

ID=37424108

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2006100318081A CN100411758C (en) 2006-06-06 2006-06-06 A method for making semi-processed cold rolled silicon steel in thin slab continuous casting and continuous rolling process

Country Status (1)

Country Link
CN (1) CN100411758C (en)

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100557060C (en) * 2007-01-12 2009-11-04 武汉钢铁(集团)公司 The manufacture method of C-Mn-Ti series hot-rolled high strength high magnetic induction performance steel
CN101147919B (en) * 2007-09-30 2010-10-13 马鞍山钢铁股份有限公司 Method for reducing cold rolled galvanized plate surface defect with CSP hot rolled coil as raw material
CN101121992B (en) * 2007-09-18 2010-11-17 湖南华菱涟源钢铁有限公司 Method for producing strong annealed steel hot-rolled sheet coil
CN101463447B (en) * 2007-12-18 2010-12-08 鞍钢股份有限公司 Method for producing oriented silicon steel by heating low temperature casting blank
CN101914726A (en) * 2010-06-23 2010-12-15 马鞍山钢铁股份有限公司 Low-carbon low-silicon high-efficiency non-oriented electrical steel sheet and production method thereof
CN101670372B (en) * 2009-09-25 2011-01-26 首钢总公司 Method for eliminating defect of strip shape of hot-rolled high-strength steel
CN102002553A (en) * 2010-12-01 2011-04-06 山西太钢不锈钢股份有限公司 Desulfurization method of medium and low grade cold rolling non-oriented molten silicon steel
CN101591752B (en) * 2009-06-09 2011-04-06 武汉钢铁(集团)公司 Steel for cup-shaped iron core of loudspeaker and production method thereof
CN101748243B (en) * 2008-12-04 2011-12-14 攀钢集团研究院有限公司 Method for preparing spring steel
CN102344993A (en) * 2011-07-08 2012-02-08 南阳汉冶特钢有限公司 Method for changing property of foreign substance in molten steel
CN102586664A (en) * 2012-02-28 2012-07-18 武汉钢铁(集团)公司 Production method of hot-rolled no-fold low carbon steel
CN102672415A (en) * 2012-05-03 2012-09-19 安徽工业大学 Steel coil opening and leveling method for reducing warping of steel plate after cutting
CN103031425A (en) * 2011-09-29 2013-04-10 鞍钢股份有限公司 Method for producing non-oriented electrical steel coated semi-processed product
CN103031421A (en) * 2011-09-29 2013-04-10 鞍钢股份有限公司 Production method of non-oriented electrical steel coating semi-processed product
CN103031422A (en) * 2011-09-29 2013-04-10 鞍钢股份有限公司 Method for producing non-oriented electrical steel coating semi-processed product
CN103031424A (en) * 2011-09-29 2013-04-10 鞍钢股份有限公司 Production method for non-oriented electrical steel coating semi-technical product
CN103509995A (en) * 2013-09-24 2014-01-15 马钢(集团)控股有限公司 Manufacturing method of semi-processed cold-rolled non-oriented electrical steel
CN103695756A (en) * 2013-12-12 2014-04-02 武汉钢铁(集团)公司 Semi-process non-oriented silicon steel produced by adopting thin slab continuous casting and continuous rolling and production method of silicon steel
CN103769418A (en) * 2012-10-26 2014-05-07 襄阳博亚精工装备股份有限公司 Continuous casting and rolling system for lead belt production
CN104014588A (en) * 2013-02-28 2014-09-03 宝钢不锈钢有限公司 Method for producing ferrite stainless steel cold-rolled strip steel
CN104164623A (en) * 2014-08-12 2014-11-26 史洪松 Low-alloy high-strength steel and manufacturing method thereof
CN105499526A (en) * 2014-09-25 2016-04-20 鞍钢股份有限公司 Method for reducing total oxygen content of aluminium-killed steel continuous cast first slab
CN106086591A (en) * 2016-07-18 2016-11-09 华南理工大学 A kind of without Si semi-processed cold-rolled non-oriented electrical steel production method Han Mn
CN106399638A (en) * 2016-08-26 2017-02-15 武汉钢铁股份有限公司 Efficient ladle furnace refining method based on thin-slab casting and rolling production of high-strength steel
CN106929632A (en) * 2017-01-17 2017-07-07 唐山钢铁集团有限责任公司 The method that the low-carbon low-silicon cold rolled steel of LF refining SPHC improves silicon hit rate
CN107790663A (en) * 2016-09-06 2018-03-13 鞍钢股份有限公司 A kind of production method of Al killed cold heading steel
CN108842036A (en) * 2018-07-02 2018-11-20 新疆八钢铁股份有限公司 A kind of technique that barium element is used for low-carbon and low-silicon steel deoxidation as deoxidier
CN110385339A (en) * 2019-06-12 2019-10-29 佛山职业技术学院 A kind of levelling method of half technique steel
WO2020228240A1 (en) * 2019-05-15 2020-11-19 南阳汉冶特钢有限公司 Method for smelting high-quality steel using zinc-containing scrap steel

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE448381B (en) * 1978-09-19 1987-02-16 Tsuya Noboru SET TO MAKE A THIN BAND OF SILICONE, THIN BAND AND APPLICATION
JP4337146B2 (en) * 1997-08-08 2009-09-30 Jfeスチール株式会社 Method for producing non-oriented electrical steel sheet
JP4240736B2 (en) * 2000-03-03 2009-03-18 Jfeスチール株式会社 Non-oriented electrical steel sheet with low iron loss and high magnetic flux density and method for producing the same
CN1216174C (en) * 2002-12-13 2005-08-24 涟源钢铁集团有限公司 Low-carbon silicon steel strip for cold rolling and producting process thereof
CN1283812C (en) * 2003-10-27 2006-11-08 宝山钢铁股份有限公司 Method for manufacturing oriented silicon steel plate
CN1743127A (en) * 2005-09-29 2006-03-08 东北大学 Method for producing oriented silicon steel band by continuous casting and rolling of thin plate slab
CN1775391A (en) * 2005-12-05 2006-05-24 北京科技大学 Method for manufacturing low-name oriented electrical steel sheet

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100557060C (en) * 2007-01-12 2009-11-04 武汉钢铁(集团)公司 The manufacture method of C-Mn-Ti series hot-rolled high strength high magnetic induction performance steel
CN101121992B (en) * 2007-09-18 2010-11-17 湖南华菱涟源钢铁有限公司 Method for producing strong annealed steel hot-rolled sheet coil
CN101147919B (en) * 2007-09-30 2010-10-13 马鞍山钢铁股份有限公司 Method for reducing cold rolled galvanized plate surface defect with CSP hot rolled coil as raw material
CN101463447B (en) * 2007-12-18 2010-12-08 鞍钢股份有限公司 Method for producing oriented silicon steel by heating low temperature casting blank
CN101748243B (en) * 2008-12-04 2011-12-14 攀钢集团研究院有限公司 Method for preparing spring steel
CN101591752B (en) * 2009-06-09 2011-04-06 武汉钢铁(集团)公司 Steel for cup-shaped iron core of loudspeaker and production method thereof
CN101670372B (en) * 2009-09-25 2011-01-26 首钢总公司 Method for eliminating defect of strip shape of hot-rolled high-strength steel
CN101914726B (en) * 2010-06-23 2013-06-19 马鞍山钢铁股份有限公司 Low-carbon low-silicon high-efficiency non-oriented electrical steel sheet and production method thereof
CN101914726A (en) * 2010-06-23 2010-12-15 马鞍山钢铁股份有限公司 Low-carbon low-silicon high-efficiency non-oriented electrical steel sheet and production method thereof
CN102002553B (en) * 2010-12-01 2012-10-03 山西太钢不锈钢股份有限公司 Desulfurization method of medium and low grade cold rolling non-oriented molten silicon steel
CN102002553A (en) * 2010-12-01 2011-04-06 山西太钢不锈钢股份有限公司 Desulfurization method of medium and low grade cold rolling non-oriented molten silicon steel
CN102344993A (en) * 2011-07-08 2012-02-08 南阳汉冶特钢有限公司 Method for changing property of foreign substance in molten steel
CN103031421B (en) * 2011-09-29 2015-11-25 鞍钢股份有限公司 A kind of production method of non-oriented electrical steel coated semi handicraft product
CN103031425A (en) * 2011-09-29 2013-04-10 鞍钢股份有限公司 Method for producing non-oriented electrical steel coated semi-processed product
CN103031421A (en) * 2011-09-29 2013-04-10 鞍钢股份有限公司 Production method of non-oriented electrical steel coating semi-processed product
CN103031422A (en) * 2011-09-29 2013-04-10 鞍钢股份有限公司 Method for producing non-oriented electrical steel coating semi-processed product
CN103031424A (en) * 2011-09-29 2013-04-10 鞍钢股份有限公司 Production method for non-oriented electrical steel coating semi-technical product
CN103031424B (en) * 2011-09-29 2015-10-07 鞍钢股份有限公司 The production method of non-oriented electrical steel coated semi handicraft product
CN102586664A (en) * 2012-02-28 2012-07-18 武汉钢铁(集团)公司 Production method of hot-rolled no-fold low carbon steel
CN102586664B (en) * 2012-02-28 2013-05-22 武汉钢铁(集团)公司 Production method of hot-rolled no-fold low carbon steel
CN102672415A (en) * 2012-05-03 2012-09-19 安徽工业大学 Steel coil opening and leveling method for reducing warping of steel plate after cutting
CN103769418A (en) * 2012-10-26 2014-05-07 襄阳博亚精工装备股份有限公司 Continuous casting and rolling system for lead belt production
CN104014588A (en) * 2013-02-28 2014-09-03 宝钢不锈钢有限公司 Method for producing ferrite stainless steel cold-rolled strip steel
CN103509995B (en) * 2013-09-24 2016-01-20 马钢(集团)控股有限公司 A kind of manufacture method of half craft type cold rolling non-oriented electrical steel
CN103509995A (en) * 2013-09-24 2014-01-15 马钢(集团)控股有限公司 Manufacturing method of semi-processed cold-rolled non-oriented electrical steel
CN103695756A (en) * 2013-12-12 2014-04-02 武汉钢铁(集团)公司 Semi-process non-oriented silicon steel produced by adopting thin slab continuous casting and continuous rolling and production method of silicon steel
CN104164623A (en) * 2014-08-12 2014-11-26 史洪松 Low-alloy high-strength steel and manufacturing method thereof
CN105499526A (en) * 2014-09-25 2016-04-20 鞍钢股份有限公司 Method for reducing total oxygen content of aluminium-killed steel continuous cast first slab
CN106086591A (en) * 2016-07-18 2016-11-09 华南理工大学 A kind of without Si semi-processed cold-rolled non-oriented electrical steel production method Han Mn
CN106399638A (en) * 2016-08-26 2017-02-15 武汉钢铁股份有限公司 Efficient ladle furnace refining method based on thin-slab casting and rolling production of high-strength steel
CN107790663A (en) * 2016-09-06 2018-03-13 鞍钢股份有限公司 A kind of production method of Al killed cold heading steel
CN106929632A (en) * 2017-01-17 2017-07-07 唐山钢铁集团有限责任公司 The method that the low-carbon low-silicon cold rolled steel of LF refining SPHC improves silicon hit rate
CN108842036A (en) * 2018-07-02 2018-11-20 新疆八钢铁股份有限公司 A kind of technique that barium element is used for low-carbon and low-silicon steel deoxidation as deoxidier
WO2020228240A1 (en) * 2019-05-15 2020-11-19 南阳汉冶特钢有限公司 Method for smelting high-quality steel using zinc-containing scrap steel
CN110385339A (en) * 2019-06-12 2019-10-29 佛山职业技术学院 A kind of levelling method of half technique steel

Also Published As

Publication number Publication date
CN100411758C (en) 2008-08-20

Similar Documents

Publication Publication Date Title
CN102618792B (en) High-strength abrasion-resistant steel for engineering machinery and manufacturing method thereof
CN102041367B (en) Manufacturing method of thin strip continuously cast and cold rolled non-oriented electrical steel
AU2006274900B2 (en) Method for producing a grain-oriented electrical steel strip
CN102634735B (en) Spring steel used for automobile suspension as well as preparation method and application thereof
CN101254527B (en) Method for producing low carbon bainite high-strength steel based on sheet bar continuous casting and rolling process flow
CN101121992B (en) Method for producing strong annealed steel hot-rolled sheet coil
CN101363101B (en) Large thickness quenched high strength steel and production method thereof
CN107099728B (en) A kind of manufacturing method of the high Ti abrasion-resistant stees NM450 of Thin Specs
CN101238227B (en) Method for producing a grain-oriented electrical steel strip
CN102162065B (en) 550Mpa yield-strength low-carbon bainitic steel for engineering machinery and preparation method thereof
CN100463979C (en) Manufacturing method of cold rolling electric steel special for compressor
CN100567519C (en) A kind of production technique of the deep-draw level cold-rolled steel sheet based on CSP technology
CN103397249B (en) Hypoxemia low-carbon electrical steel and production method thereof
CN101135030B (en) Weather-resistant hot rolled narrow steel strip and method for manufacturing same
CN102758144B (en) Production method for steel ingot of large-sized high-nitrogen retaining ring steel
CN101289731B (en) CrMnTi narrow hardenability strip pinion steels and method of manufacture
CN102618782B (en) Large-specification Z-direction H-steel and preparation method thereof
CN103911487B (en) A kind of method of smelting suprelow carbon steel and the method for continuous casting ultra low-carbon steel
CN102899556B (en) Production method for low-alloy medium-thick steel plate
CN102061351B (en) Method for producing low-carbon steel and ultra-low-carbon steel by VD, LF and VD processes
CN101139681B (en) High grade cold rolling non-oriented silicon steel and method for manufacturing same
CN102719759B (en) Elastic bar steel for high-speed rail fastener and smelting production method thereof
JP5479448B2 (en) Method for producing directional silicon steel with high electromagnetic performance
CN101906577B (en) Non-oriented electrical steel produced by sheet continuous casting and rolling and method thereof
CN101768697B (en) Method for manufacturing oriented silicon steel with one-step cold rolling method

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
TR01 Transfer of patent right

Effective date of registration: 20111223

Address after: Hong Jia Zhou River Road 417009 Hunan city of Loudi province No. 1

Co-patentee after: Hunan Hualing Lianyuan Steel Co., Ltd.

Patentee after: Hunan Hualinglian Steel Thin Plate Co., Ltd.

Address before: Huangnitang 417009 Hunan city of Loudi Province

Patentee before: Hunan Hualing Lianyuan Steel Co., Ltd.

Effective date of registration: 20111223

Address after: Hong Jia Zhou River Road 417009 Hunan city of Loudi province No. 1

Co-patentee after: Hunan Hualing Lianyuan Steel Co., Ltd.

Patentee after: Hunan Hualinglian Steel Thin Plate Co., Ltd.

Address before: Huangnitang 417009 Hunan city of Loudi Province

Patentee before: Hunan Hualing Lianyuan Steel Co., Ltd.

ASS Succession or assignment of patent right

Owner name: HUNAN HUALINGLIAN STEEL THIN PLATE CO., LTD.

Free format text: FORMER OWNER: HUNAN HUALING LIANYUAN STEEL CO., LTD.

Effective date: 20111223

Owner name: HUNAN HUALING LIANYUAN STEEL CO., LTD.

Effective date: 20111223

C41 Transfer of patent application or patent right or utility model
C53 Correction of patent for invention or patent application
COR Change of bibliographic data

Free format text: CORRECT: INVENTOR; FROM: WU GUANGLIANG ZHENG BAIPING JIAO GUOHUA TO: WU GUANGLIANG ZHENG BAIPING JIAO GUOHUA PENG MINGYAO ZHOU JIAN ZHOU YU

CB03 Change of inventor or designer information

Inventor after: Wu Guangliang

Inventor after: Zheng Baiping

Inventor after: Jiao Guohua

Inventor after: Peng Mingyao

Inventor after: Zhou Jian

Inventor after: Zhou Yu

Inventor before: Wu Guangliang

Inventor before: Zheng Baiping

Inventor before: Jiao Guohua

Inventor after: Wu Guangliang

Inventor after: Zheng Baiping

Inventor after: Jiao Guohua

Inventor after: Peng Mingyao

Inventor after: Zhou Jian

Inventor after: Zhou Yu

Inventor before: Wu Guangliang

Inventor before: Zheng Baiping

Inventor before: Jiao Guohua

TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20201125

Address after: 410000, east of Chuangye 4th Road, north of Chuangxin 1st Street, west of Yaochun Road, Hualing thin plate industrial park, Loudi economic and Technological Development Zone, Hunan Province

Patentee after: Hunan Hualing LIANGANG special new material Co., Ltd

Patentee after: LYSTEEL Co.,Ltd.

Address before: Hong Jia Zhou River Road 417009 Hunan city of Loudi province No. 1

Patentee before: HUNAN HUALING LIANGANG STEEL SHEET Co.,Ltd.

Patentee before: LYSTEEL Co.,Ltd.