CN106048390B - A kind of production method of thin slab continuous casting and rolling production non-oriented electrical steel 50W800 - Google Patents

A kind of production method of thin slab continuous casting and rolling production non-oriented electrical steel 50W800 Download PDF

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CN106048390B
CN106048390B CN201610569179.1A CN201610569179A CN106048390B CN 106048390 B CN106048390 B CN 106048390B CN 201610569179 A CN201610569179 A CN 201610569179A CN 106048390 B CN106048390 B CN 106048390B
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steel
furnace
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molten steel
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CN106048390A (en
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李烈军
周峰
彭政务
高吉祥
孙海波
陈松军
刘江
胡玲
张河健
张伟鹏
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South China University of Technology SCUT
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1222—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1233—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2261/00—Machining or cutting being involved

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

A kind of production method of thin slab continuous casting and rolling production non-oriented electrical steel 50W800, comprising: step 1), molten iron pretreatment；Step 2), converter smelting；Step 3), Argon: double deoxidizer being added in converter tapping, and the whole Argon in converter tapping process；Step 4), RH refining: molten steel is sent into vacuum RH refining furnace and is smelted；Step 5), casting；Step 6), pickling and cold-rolling；Step 7), cleaning by degreasing, decarburizing annealing；Step 8), coating.The trade mark of the invention is 50W800, and with a thickness of 0.50mm semi-processed cold-rolled non-oriented electrical steel, product electromagnetic performance P15/50≤5.6W/kg, 50 >=1.74T of magnetic induction density B is good with current half-technique non oriented electrical steel national standard contrast properties.

Description

A kind of production method of thin slab continuous casting and rolling production non-oriented electrical steel 50W800
Technical field
The present invention relates to the production method of full technique cold rolling non-oriented electrical steel 50W800 a kind of, specifically a kind of thin plates The production method of continuous-casting tandem-rolling production non-oriented electrical steel 50W800.
Background technique
Electrician is a kind of soft magnetic materials with silicon steel sheet, is the maximum a kind of alloy material of dosage in magnetic material, main to use The middle manufacture transformer in mechanotronics, motor iron-core and other magnetic conduction components etc., be power engineering, motor machine manufacture, The essential important materials of the industry such as household electrical appliance, radio technology, telecommunication instrument, cold rolling electric is due to its production technology Complicated, with high content of technology, production difficulty is big, investment is big, and the country has a few steel mill such as Wuhan Iron and Steel Plant, Baosteel, Anshan iron and steel plant, Taiyuan Iron and Steel Co. that can give birth to It produces, the slab i.e. traditional handicraft that these producers are all made of conventional thickness produced, but big with continuous casting and rolling (CSP) technique The industrial application of scale opens another brand-new technique to electrical sheet production, the practice of external CSP production electrical sheet and " 15 national brainstorm project " initial achievements show: using CSP produce in the low trade mark non-oriented electrical steel have it is apparent Investment, cost and quality-advantage protect environment, energy saving, are current China with the implementation of National Sustainable Development Strategies One important directions of development of iron & steel industry, China in 2015 produce 7,010,000 tons of full-technique non-oriented electrical steel altogether.
It is also different to the constituent contents content requirement such as silicon, Si, Mn, Al with the difference of the silicon steel trade mark.In process of production, Strict control element is wanted when silicon, manganese and aluminum smelting technology；And the harmful elements such as carbon, sulphur, nitrogen and oxygen should be low as far as possible.Essential element influences such as Under:
(1) silicon
Resistivity can be improved in silicon, reduces the anisotropy of crystal, can also promote grain coarsening, reduces crystal boundary face；Silicon It can also promote the carbon graphite in steel, improve carbon to magnetic harm；As strong deoxidant element, can remove to magnetic unfavorable Oxygen.But excessively high silicone content will lead to the brittleness of silicon steel, bring difficulty to rolling and processing.In addition, silicon is easy to oxidize and causes Silicon steel sheet gets rusty.
(2) carbon
Non-oriented electrical steel generally requires carbon content≤0.005%, best C < 0.003%.High trade mark requirement C≤ 0.005%, more preferably less than 0.003%.Purpose is to prevent from forming internal oxidation layer and interior nitration case with not decarburization when after annealing, is prevented Only hearth roll is stained with iron scale and causes to scratch.AlN, which is not easy solid solution, when carbon is low can prevent that tiny AlN is precipitated, and be final Annealing temperature raising can promote crystal grain and grow up, and improve magnetic.
(3) manganese
Manganese improves hot rolling plasticity and hot rolled plate tissue because manganese expands γ-Fe phase region, makes γ-Fe → α-Fe phase speed change Degree slows down.Manganese can be MnS roughening, is conducive to crystal grain and grows up.Punching and machinability can be improved in manganese.
(4) aluminium
In non-orientation silicon steel, aluminium plays an important role to magnetism, because the effect of aluminium is similar to silicon.And to the intensity of steel and The influence of hardness has unlike silicon is so obvious.By atomic radius sequence；Aluminium≤iron≤silicon, the distortion of lattice ratio for adding aluminium to make iron add silicon It is lighter.Brittleness increase degree is small, therefore increases with the trade mark.Silicon highest maintains 3%.And aluminum amount is to step up about 1% aluminium Heat of solution be about 205 times of silicon.It is more stronger than silicon to stablize ferritic effect.For influence to iron silicon-carbon phasor.Add 0.3% Aluminium is equivalent to plus 0.75% silicon.
(5) sulphur
Sulfur content reduces, and iron loss is decreased obviously.When sulfur content is reduced to 50ppm from 180ppm in 1.5%Si steel, P10From 2.6W/kg is reduced to 2.0W/kg, reduces about 30%, is equivalent to and improves about two trades mark.Steel desulfurization is production non-orientation silicon steel An indispensable measure.
(6) phosphorus
Non-oriented electrical steel just will appear embrittlement phenomena with the increase that P contains in steel, steel, this mostly occur after annealing, because Low for carbon content, phosphorus increases along crystal boundary segregation amount, and manganese promotes the segregation of phosphorus again, and number of bends is reduced to 1-2 times, phosphorus it is caused this Kind of embrittlement is reversible, and slow cooling or brittle steel plate is heated to about 430 DEG C of heat preservations after annealing ductility can be improved, because this promotes Carbon improves crystal boundary cohesive force and reduces phosphorus segregation amount along crystal boundary segregation.
The domestic full technological electrical steel of No yield point generallys use Si element as magnetic property element is improved, as Si contains at present Amount increases, and the brittleness of steel is higher, so that hot rolling, cold rolling production difficulty are higher, while Si content is higher, it is desirable that steel grade P content is got over It is low, and the iron ore in some areas in China contains P higher, molten iron P content is high, is not easy to remove in steelmaking process.In the mark of silicon steel In quasi- technology, smelts ingredient and do not provide, but the chemical component of each grade silicon steel must satisfy performance requirement.The present invention is according to mine The actual conditions of stone raw material produce electromagnetic performance by ingredient and process optimization and are better than state in conjunction with continuous casting and rolling technique of sheet bar Family's standard requirements, punching is functional, meets the full technological electrical steel 50W800 of No yield point of customer requirement.
Summary of the invention
In conclusion it is necessary to provide the lifes of thin slab continuous casting and rolling production non-oriented electrical steel 50W800 a kind of by the present invention Production method.
A kind of production method of thin slab continuous casting and rolling production non-oriented electrical steel 50W800: include:
Step 1), molten iron pretreatment；
Step 2), converter smelting: converter and the steel scrap that total weight 12% is added, and determine oxygen tapping；
Step 3), Argon: double deoxidizer being added in converter tapping, and the whole Argon in converter tapping process；
Step 4), RH refining: molten steel is sent into vacuum RH refining furnace and is smelted；
Step 5), casting: molten steel casts 55-70mm heavy slab by thin-slab caster, and conticaster pulling rate is 3.0- 4.5m/min, continuous casting billet charging temperature >=850 DEG C, bringing-up section temperature is 1000-1150 DEG C in furnace, and slab tapping temperature is 980- 1120 DEG C, exit temperature at finishing is 860-920 DEG C, and coiling temperature is 680-720 DEG C, F1 reduction ratio >=50%, F1-F4 accumulation pressure Lower rate >=90%, F7 reduction ratio≤15%, rolls the hot rolled plate for 2-3mm；
Step 6), pickling and cold-rolling: being lower than 60 DEG C after after hot rolling plate temperature is 30~150g/L chlorohydric acid pickling, acid through concentration Bath temperature degree is 60~80 DEG C, and pickling time is 95 seconds, removes the impurity and iron scale on coil of strip surface, then carries out cold rolling；
Step 7), cleaning by degreasing, decarburizing annealing
Cleaning by degreasing coil of strip enters continuous decarburization annealing furnace by the coil of strip of cleaning by degreasing, and furnace temperature is set as 850~920 DEG C, decarburizing annealing section keeps temperature uniform using resistance heating, using 82%N2+ 17%H2+ 1%H2O is as decarburizing annealing gas Atmosphere；
Step 8), coating:
After steel band after Overheating Treatment is come out by quenching cooling apparatus, through water spray cooler adjustment plate temperature, and Through squeeze roller compressive surface remnants moisture content, strip enters four-roller coating machine after hot-air drier is dried, and is applied using coating Plating, coated and dried furnace, coating sintering furnace temperature are sintered between 400~450 DEG C, are then cooled to using air shower cooler Room temperature produces the full-technique non-oriented electrical steel 50W800 of surface-brightening.
Wherein, the percentage of gas is protected to refer to the percentage by volume of gas in this specification.The percentage of each element in molten steel Than referring to mass percent.
Wherein, the step 4) is specifically, take off 50ppm hereinafter, and being added for C in molten steel using RH vacuum degasser The alloys such as low-carbon Mn, Al carry out alloying, tap when S content is less than 50ppm.
Wherein, the specific method of RH refining is: molten steel is sent into vacuum RH refining furnace and is smelted, according to liquid steel temperature, Oxygen content and decarburization terminal steel sample ingredient carry out preliminary alloying, promote argon flow control in 140-170m3/ h, is first added aluminium Block deoxidation, then Als is adjusted to target value, low-carbon ferromanganese, ferrophosphorus etc. is then added and carries out composition initial adjustment, in the limit after alloy addition It is recycled 3 minutes under conditions of vacuum degree≤130Pa, thermometric, determines oxygen at sampling.
Wherein, step 5) specifically: molten steel casts 55-70mm heavy slab by thin-slab caster, and conticaster pulling rate is 3.0-4.5m/min, continuous casting billet charging temperature >=850 DEG C, bringing-up section temperature is 1000-1150 DEG C in furnace, and slab tapping temperature is 980-1120 DEG C, exit temperature at finishing is 860-920 DEG C, and coiling temperature is 680-720 DEG C, and F1 reduction ratio >=50%, F1-F4 is tired Product reduction ratio >=90%, F7 reduction ratio≤15%, rolls as the hot rolled plate with a thickness of 2.3-3.0mm.
Wherein, the step 6) specifically: being lower than 60 DEG C after after hot rolling plate temperature is 30~150g/L hydrochloric acid through concentration Pickling, acid tank temperature are 60~80 DEG C, and pickling time is 95 seconds, the impurity and iron scale on coil of strip surface are removed, after pickling Coil of strip is 0.50-0.55mm thickness coil of strip through cold continuous mill group rolling.
The coating of the step 8) is T2 coating.
This method process flow are as follows: molten iron pretreatment → converter smelting → Argon → RH is concise → CSP continuous casting → CSP heating Furnace → CSP hot continuous rolling → cold rolling → degreasing → decarburizing annealing → insulating coating → electromagnetic performance is examined → is packed and stored.
It is smelted using vacuum RH furnace.The core of the technique is to take off C in molten steel first with RH vacuum degasser 50ppm is hereinafter, solve the problems, such as electrical sheet Molten Steel Cleanliness, and the alloys such as low-carbon ferrosilicon alloy, Mn, Al are added and carry out alloy Change.Molten steel general S when RH is outbound should be less than 50ppm.
The RH refining: sending molten steel into vacuum RH refining furnace and smelt, and the alloys such as low-carbon Mn, Al are added and carry out alloy Change, so that molten steel composition [C]≤0.005%, [Si]≤0.02%, 0.40%≤[Mn]≤0.60%, [P]≤0.04%, [S] ≤ 0.005%, 0.25%≤[Al]≤0.35%, 1580 DEG C of tapping temperature.
The core of CSP continuous casting process is to control molten steel from the increasing C during the middle packet-crystallizer of great Bao-and increase N, is used Special middle covering agent and dedicated ultralow C steel crystallizer protecting residue.Slab is having a size of 55~70 × 1000~1275mm, even Casting speed control is cast in 3.0~4.5m/min or so.
Hot rolling technology uses reasonable temperature schedule and reduction system.To guarantee the crystal grain that is roughened of electrical sheet finished product, Heating temperature be 1000~1150 DEG C, tapping temperature be 980~1120 DEG C, 920~860 DEG C of exit temperature at finishing, coiling temperature It is 680~720 DEG C.System design should be solved the problems, such as simultaneously of both belt plate shape control and grain coarsening under hot rolling, therefore Reduction ratio is controlled the maximum magnitude allowed in equipment, milling train F1 reduction ratio >=50%, F1~F4 by 3~4 passages before rolling Accumulation reduction ratio >=90%, F7 passage uses small reduction ratio with adjustment plate shape and induction grain coarsening, reduction ratio≤15%.To make Rolling the fine ferrite crystal grain being mutually deformed into afterwards has growing up the time for abundance, using high coiling temperature, is easy to break to be formed Broken iron scale, acid cleaning process is more efficient, and ultra-rapid cooling mode is taken after rolling.
Pickling-cold rolling
Product surface iron scale is not fine and close, and be easy to produce it is broken, therefore use chlorohydric acid pickling (HCl) acid strength for 30~150g/L, using acid pickling promotor, 60~80 DEG C of descaling bath temperature, pickling operating rate 150-200m/min, it is ensured that band The control of steel surface quality is good, trimming after pickling, and sheared edge is smooth after cutting edge, impulse- free robustness, non-notch, stagnation pressure when cold rolling Lower rate should be greater than 75%, using forebay heavy reduction rate (35% or more), last rack reduction ratio≤8%.It uses and alters simultaneously Roller, roller, the control of convex roller improve plate shape.
Decarburizing annealing coating.
After coil of strip uncoiling that non-oriented electrical steel is chill, Full-automatic welding is carried out using limited lap welder, after the completion of degreasing Decarburizing annealing is carried out in into annealing furnace, is mainly made of the furnace section of following part with steel heat treatment: inlet seal room, preheating Furnace, scale-free heating furnace, No. 1 furnace throat, radiant tube bringing-up section, soaking zone, No. 2 furnace throats, recyclegas spray cooling device, outlet Seal room, quenching cooling apparatus.It is heated in stove preheating section, bringing-up section section using radiant tube, using N2As protective gas, furnace Temperature is set to 850~920 DEG C, and decarburizing annealing section keeps temperature uniform using resistance heating, using 85%N2+ 14%H2+ 1%H2O As decarburizing annealing atmosphere.It completes to grow up to strip decarburizing annealing, crystal grain, improve at the technique of electromagnetic performance and elimination stress Reason.After steel band after Overheating Treatment is come out by quenching cooling apparatus, through water spray cooler adjustment plate temperature, and through extracting Roller compressive surface remnants moisture content, strip enters rear platform after hot-air drier is dried, and applies to be coated with insulation to belt steel surface Layer, two four-roller coating machines are provided on unit, and be configured with coating solution configuration system on line and use for two units.Two units It is provided with coating fluid circulation.Match with this provided with coated and dried furnace, coating sintering furnace and air shower cooler, To produce qualified insulating coating product.
A kind of thin slab continuous casting and rolling production non-oriented electrical steel 50W800 produced by the present invention has the advantage that
Using continuous casting and rolling technique of sheet bar production semi-processed cold-rolled non-oriented electrical steel cost of investment ratio using traditional work Skill low 20~30%.
Si is substituted using Mn+Al and improves P in the content of steel grade, therefore high P iron ore production Gao Pin can used Matter full-technique non-oriented electrical steel.
To reduce in hot rolling, cold rolling control difficulty using Mn+Al substitution Si, production is more stable, plate shape is more controllable.
The product produced using the method, for product hardness HV10 between 90~110 Vickers hardnesses, punching performance is more preferable.
The trade mark of the invention is 50W800, with a thickness of 0.50mm semi-processed cold-rolled non-oriented electrical steel, product electromagnetic performance P15/50≤5.6W/kg, 50 >=1.74T of magnetic induction density B are compared, iron with current half-technique non oriented electrical steel national standard Damage low 2.4W/kg, the high 0.04T of magnetic induction intensity, interface resistance >=2100 Ω mm2/ piece, meets national standard and client wants It asks, 90~110HV10 of Vickers hardness, alternating bending frequency >=12 time, welding performance is good.
Specific embodiment
The present invention is described further below with reference to some specific embodiments.Specific embodiment is further specifically The bright present invention, non-limiting protection scope of the present invention.
Embodiment 1
A kind of production method of thin slab continuous casting and rolling production non-oriented electrical steel 50W800:
Step 1), molten iron pretreatment: pouring into blast-melted in ladle, carries out blowing magnesium desulfurization by molten iron pretreatment；
Step 2), converter smelting: the molten steel after desulfurization is poured into that oxygen top bottom is compound to blow by oxygen top bottom blowing converter Converter is refined, while the steel scrap for accounting for total weight 10% being added into converter, lime stone, firefly is added into Converter in converting process Stone, as molten steel composition [C]≤0.06%, [P]≤0.04%, [S]≤0.15% determines oxygen when Molten Steel End Point is 1680 DEG C Tapping；
Step 3), Argon: being added double deoxidizer in converter tapping, whole Argon, Argon in converter tapping process Liquid steel temperature is measured afterwards, determines oxygen, sampling, and aluminum steel is fed into molten steel according to steel oxygen content in water；
Step 4), RH refining: molten steel is sent into vacuum RH refining furnace and is smelted, and the alloys such as low-carbon Mn, Al are added and are closed Aurification, so that molten steel composition [C]=0.005%, [Si]=0.01%, [Mn]=0.50%, [P]=0.025%, [S]= 0.003%, [Al]=0.25%, 1580 DEG C of tapping temperature；The specific method of the RH refining is: molten steel is sent into vacuum RH essence Furnace is smelted, and carries out preliminary alloying according to liquid steel temperature, oxygen content and decarburization terminal steel sample ingredient, promotes argon flow control In 140-170m3/ h is first added aluminium block deoxidation, then Als is adjusted to target value, be then added low-carbon ferromanganese, ferrophosphorus etc. carry out at Part initial adjustment, alloy recycle 3 minutes under conditions of final vacuum≤130Pa after being added, and thermometric, determines oxygen at sampling；
Step 5), casting: molten steel casts 70mm heavy slab by thin-slab caster, and conticaster pulling rate is 4.0m/min, Continuous casting billet charging temperature >=850 DEG C, bringing-up section temperature is 1120 DEG C in furnace, and slab tapping temperature is 1080 DEG C, finish rolling outlet temperature Degree is 880 DEG C, and coiling temperature is 700 DEG C, F1 reduction ratio 55.2%, F2 reduction ratio 53.3%, and F7 reduction ratio 12.6% rolls and is With a thickness of the hot rolled plate of 2.7mm；
Step 6), pickling and cold-rolling: being lower than 60 DEG C after after hot rolling plate temperature is 85g/L chlorohydric acid pickling, acid tank temperature through concentration Degree is 75 DEG C, and pickling time is 95 seconds, the impurity and iron scale on coil of strip surface is removed, by coil of strip after pickling through cold rolling tandem mill Group rolling is 0.50mm thickness coil of strip；
Step 7), cleaning by degreasing, decarburizing annealing
Cleaning by degreasing coil of strip enters continuous decarburization annealing furnace by the coil of strip of cleaning by degreasing, and furnace temperature is set as 900 DEG C, takes off Carbon annealing section keeps temperature uniform using resistance heating, using 82%N2+ 17%H2+ 1%H2O is as decarburizing annealing atmosphere；
Step 8), coating:
After steel band after Overheating Treatment is come out by quenching cooling apparatus, through water spray cooler adjustment plate temperature, and Through squeeze roller compressive surface remnants moisture content, strip enters four-roller coating machine after hot-air drier is dried, and is applied using coating Plating, coated and dried furnace, coating sintering furnace temperature are sintered between 400~450 DEG C, are then cooled to using air shower cooler Room temperature produces the full-technique non-oriented electrical steel 50W800 of surface-brightening.
The coating that the turns blue full technique cold rolling non-oriented electrical steel 50W800 of the method production, iron loss 5.3W/kg, magnetic strength Answering intensity is 1.74T, and interface resistance is 2220 Ω mm2/ piece, Vickers hardness 95HV10, alternating bending frequency 16 times.
Embodiment 2
A kind of production method of thin slab continuous casting and rolling production non-oriented electrical steel 50W800:
Step 1), molten iron pretreatment: pouring into blast-melted in ladle, carries out blowing magnesium desulfurization by molten iron pretreatment；
Step 2), converter smelting: the molten steel after desulfurization is poured into that oxygen top bottom is compound to blow by oxygen top bottom blowing converter Converter is refined, while the steel scrap for accounting for total weight 10% being added into converter, lime stone, firefly is added into Converter in converting process Stone, as molten steel composition [C]≤0.06%, [P]≤0.04%, [S]≤0.15% determines oxygen when Molten Steel End Point is 1680 DEG C Tapping；
Step 3), Argon: being added double deoxidizer in converter tapping, whole Argon, Argon in converter tapping process Liquid steel temperature is measured afterwards, determines oxygen, sampling, and aluminum steel is fed into molten steel according to steel oxygen content in water；
Step 4) RH refining: sending molten steel into vacuum RH refining furnace and smelt, and the alloys such as low-carbon Mn, Al are added and carry out alloy Change, so that molten steel composition [C]=0.005%, [Si]=0.01%, [Mn]=0.55%, [P]=0.028%, [S]= 0.003%, [Al]=0.3%, 1585 DEG C of tapping temperature；The specific method of the RH refining is: molten steel is sent into vacuum RH essence Furnace is smelted, and carries out preliminary alloying according to liquid steel temperature, oxygen content and decarburization terminal steel sample ingredient, promotes argon flow control In 140-170m3/ h is first added aluminium block deoxidation, then Als is adjusted to target value, be then added low-carbon ferromanganese, ferrophosphorus etc. carry out at Part initial adjustment, alloy recycle 3 minutes under conditions of final vacuum≤130Pa after being added, and thermometric, determines oxygen at sampling；
Step 5), casting: molten steel casts 70mm heavy slab by thin-slab caster, and conticaster pulling rate is 4.0m/min, Continuous casting billet charging temperature >=850 DEG C, bringing-up section temperature is 1120 DEG C in furnace, and slab tapping temperature is 1080 DEG C, finish rolling outlet temperature Degree is 880 DEG C, and coiling temperature is 700 DEG C, F1 reduction ratio 53.2%, F2 reduction ratio 53.5%, and F7 reduction ratio 14.2% rolls and is With a thickness of the hot rolled plate of 2.5mm:
Step 6), pickling and cold-rolling: being lower than 60 DEG C after after hot rolling plate temperature is 85g/L chlorohydric acid pickling, acid tank temperature through concentration Degree is 75 DEG C, and pickling time is 95 seconds, the impurity and iron scale on coil of strip surface is removed, by coil of strip after pickling through cold rolling tandem mill Group rolling is 0.50mm thickness coil of strip；
Step 7), cleaning by degreasing, decarburizing annealing
Cleaning by degreasing coil of strip enters continuous decarburization annealing furnace by the coil of strip of cleaning by degreasing, and furnace temperature is set as 900 DEG C, takes off Carbon annealing section keeps temperature uniform using resistance heating, using 85%N2+ 14%H2+ 1%H2O is as decarburizing annealing atmosphere；
Step 8), coating:
After steel band after Overheating Treatment is come out by quenching cooling apparatus, through water spray cooler adjustment plate temperature, and Through squeeze roller compressive surface remnants moisture content, strip enters four-roller coating machine after hot-air drier is dried, and is carried out using T2 coating Coating, coated and dried furnace, coating sintering furnace temperature are sintered between 400~450 DEG C, then cooling using air shower cooler To room temperature, the full-technique non-oriented electrical steel 50W800 of surface-brightening is produced.
The coating that the turns blue full technique cold rolling non-oriented electrical steel 50W800 of the method production, iron loss 5.1W/kg, magnetic strength Answering intensity is 1.74T, and interface resistance is 2156 Ω mm2/ piece, Vickers hardness 92HV10, alternating bending frequency 17 times.
Embodiment 3
A kind of production method of thin slab continuous casting and rolling production non-oriented electrical steel 50W800:
Step 1), molten iron pretreatment: pouring into blast-melted in ladle, carries out blowing magnesium desulfurization by molten iron pretreatment；
Step 2), converter smelting: the molten steel after desulfurization is poured into that oxygen top bottom is compound to blow by oxygen top bottom blowing converter Converter is refined, while the steel scrap for accounting for total weight 10% being added into converter, lime stone, firefly is added into Converter in converting process Stone, as molten steel composition [C]≤0.06%, [P]≤0.04%, [S]≤0.15% determines oxygen when Molten Steel End Point is 1680 DEG C Tapping；
Step 3), Argon: being added double deoxidizer in converter tapping, whole Argon, Argon in converter tapping process Liquid steel temperature is measured afterwards, determines oxygen, sampling, and aluminum steel is fed into molten steel according to steel oxygen content in water；
Step 4), RH refining: molten steel is sent into vacuum RH refining furnace and is smelted, and the alloys such as low-carbon Mn, Al are added and are closed Aurification, so that molten steel composition [C]=0.003%, [Si]=0.01%, [Mn]=0.53%, [P]=0.020%, [S]= 0.003%, [Al]=0.28%, 1580 DEG C of tapping temperature；The specific method of the RH refining is: molten steel is sent into vacuum RH essence Furnace is smelted, and carries out preliminary alloying according to liquid steel temperature, oxygen content and decarburization terminal steel sample ingredient, promotes argon flow control In 140-170m3/ h is first added aluminium block deoxidation, then Als is adjusted to target value, be then added low-carbon ferromanganese, ferrophosphorus etc. carry out at Part initial adjustment, alloy recycle 3 minutes under conditions of final vacuum≤130Pa after being added, and thermometric, determines oxygen at sampling；
Step 5), casting: molten steel casts 70mm heavy slab by thin-slab caster, and conticaster pulling rate is 4.0m/min, Continuous casting billet charging temperature >=850 DEG C, bringing-up section temperature is 1120 DEG C in furnace, and slab tapping temperature is 1080 DEG C, finish rolling outlet temperature Degree is 880 DEG C, and coiling temperature is 700 DEG C, F1 reduction ratio 55.2%, F2 reduction ratio 53.3%, and F7 reduction ratio 12.6% rolls and is With a thickness of the hot rolled plate of 2.7mm；
Step 6), pickling and cold-rolling: being lower than 60 DEG C after after hot rolling plate temperature is 85g/L chlorohydric acid pickling, acid tank temperature through concentration Degree is 75 DEG C, and pickling time is 95 seconds, the impurity and iron scale on coil of strip surface is removed, by coil of strip after pickling through cold rolling tandem mill Group rolling is 0.50mm thickness coil of strip；
Step 7), cleaning by degreasing, decarburizing annealing
Cleaning by degreasing coil of strip enters continuous decarburization annealing furnace by the coil of strip of cleaning by degreasing, and furnace temperature is set as 900 DEG C, takes off Carbon annealing section keeps temperature uniform using resistance heating, using 85%N2+ 14%H2+ 1%H2O is as decarburizing annealing atmosphere；
Step 8), coating:
After steel band after Overheating Treatment is come out by quenching cooling apparatus, through water spray cooler adjustment plate temperature, and Through squeeze roller compressive surface remnants moisture content, strip enters four-roller coating machine after hot-air drier is dried, and is carried out using T2 coating Coating, coated and dried furnace, coating sintering furnace temperature are sintered between 400~450 DEG C, then cooling using air shower cooler To room temperature, the full-technique non-oriented electrical steel 50W800 of surface-brightening is produced.
The coating that the turns blue full technique cold rolling non-oriented electrical steel 50W800 of the method production, iron loss 5.4W/kg, magnetic strength Answering intensity is 1.75T, and interface resistance is 2160 Ω mm2/ piece, Vickers hardness 96HV10, alternating bending frequency 18 times.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair Equivalent structure or equivalent flow shift made by bright description is applied directly or indirectly in other relevant technology necks Domain is included within the scope of the present invention.

Claims (3)

1. a kind of production method of thin slab continuous casting and rolling production non-oriented electrical steel 50W800, it is characterised in that:
Step 1), molten iron pretreatment: pouring into blast-melted in ladle, carries out blowing magnesium desulfurization by molten iron pretreatment；
Step 2), converter smelting: the molten steel after desulfurization is poured into oxygen top bottom blowing and turned by oxygen top bottom blowing converter Furnace, while the steel scrap for accounting for total weight 10% being added into converter, lime stone, fluorite is added into Converter in converting process, As molten steel composition [C]≤0.06%, [P]≤0.04%, [S]≤0.15% determines oxygen and goes out when Molten Steel End Point is 1680 DEG C Steel；
Step 3), Argon: being added double deoxidizer in converter tapping, the whole Argon in converter tapping process, surveys after Argon Dimension coolant-temperature gage determines oxygen, sampling, and aluminum steel is fed into molten steel according to steel oxygen content in water；
Step 4), RH refining: sending molten steel into vacuum RH refining furnace and smelt, and the alloys such as low-carbon Mn, Al are added and carry out alloying, So that molten steel composition [C]=0.005%, [Si]=0.01%, [Mn]=0.50%, [P]=0.025%, [S]=0.003%, [Al]=0.25%, 1580 DEG C of tapping temperature；The specific method of the RH refining is: molten steel is sent into vacuum RH refining furnace smelting Refining carries out preliminary alloying according to liquid steel temperature, oxygen content and decarburization terminal steel sample ingredient, promotes argon flow control in 140- 170m3/h is first added aluminium block deoxidation, then Als is adjusted to target value, and low-carbon ferromanganese, ferrophosphorus etc. is then added and carries out composition initial adjustment, Alloy recycles 3 minutes under conditions of final vacuum≤130Pa after being added, and thermometric, determines oxygen at sampling；
Step 5), casting: molten steel casts 70mm heavy slab by thin-slab caster, and conticaster pulling rate is 4.0m/min, continuous casting Base charging temperature >=850 DEG C, bringing-up section temperature is 1120 DEG C in furnace, and slab tapping temperature is 1080 DEG C, and exit temperature at finishing is 880 DEG C, coiling temperature is 700 DEG C, F1 reduction ratio 55.2%, F2 reduction ratio 53.3%, and F7 reduction ratio 12.6% rolls as thickness For the hot rolled plate of 2.7mm；
Step 6), pickling and cold-rolling: being lower than 60 DEG C after after hot rolling plate temperature is 85g/L chlorohydric acid pickling through concentration, and acid tank temperature is 75 DEG C, pickling time is 95 seconds, removes the impurity and iron scale on coil of strip surface, coil of strip after pickling is rolled through cold continuous mill group It is made as 0.50mm thickness coil of strip；
Step 7), cleaning by degreasing, decarburizing annealing
Cleaning by degreasing coil of strip enters continuous decarburization annealing furnace by the coil of strip of cleaning by degreasing, and furnace temperature is set as 900 DEG C, and decarburization is moved back Fiery section keeps temperature uniform using resistance heating, using 82%N2+17%H2+1%H2O as decarburizing annealing atmosphere；
Step 8), coating:
After steel band after Overheating Treatment is come out by quenching cooling apparatus, through water spray cooler adjustment plate temperature, and through squeezing Dry roller compressive surface remnants moisture content, strip enters four-roller coating machine after hot-air drier is dried, and carries out coating using coating, applies Layer drying oven, coating sintering furnace temperature are sintered between 400~450 DEG C, are then cooled to room temperature using air shower cooler, Produce the full-technique non-oriented electrical steel 50W800 of surface-brightening.
2. a kind of production method of thin slab continuous casting and rolling production non-oriented electrical steel 50W800, it is characterised in that:
Step 1), molten iron pretreatment: pouring into blast-melted in ladle, carries out blowing magnesium desulfurization by molten iron pretreatment；
Step 2), converter smelting: the molten steel after desulfurization is poured into oxygen top bottom blowing and turned by oxygen top bottom blowing converter Furnace, while the steel scrap for accounting for total weight 10% being added into converter, lime stone, fluorite is added into Converter in converting process, As molten steel composition [C]≤0.06%, [P]≤0.04%, [S]≤0.15% determines oxygen and goes out when Molten Steel End Point is 1680 DEG C Steel；
Step 3), Argon: being added double deoxidizer in converter tapping, the whole Argon in converter tapping process, surveys after Argon Dimension coolant-temperature gage determines oxygen, sampling, and aluminum steel is fed into molten steel according to steel oxygen content in water；
Step 4) RH refining: sending molten steel into vacuum RH refining furnace and smelt, and the alloys such as low-carbon Mn, Al are added and carry out alloying, So that molten steel composition [C]=0.005%, [Si]=0.01%, [Mn]=0.55%, [P]=0.028%, [S]=0.003%, [Al]=0.3%, 1585 DEG C of tapping temperature；The specific method of the RH refining is: molten steel is sent into vacuum RH refining furnace and is smelted, Preliminary alloying is carried out according to liquid steel temperature, oxygen content and decarburization terminal steel sample ingredient, promotes argon flow control in 140- 170m3/h is first added aluminium block deoxidation, then Als is adjusted to target value, and low-carbon ferromanganese, ferrophosphorus etc. is then added and carries out composition initial adjustment, Alloy recycles 3 minutes under conditions of final vacuum≤130Pa after being added, and thermometric, determines oxygen at sampling；
Step 5), casting: molten steel casts 70mm heavy slab by thin-slab caster, and conticaster pulling rate is 4.0m/min, continuous casting Base charging temperature >=850 DEG C, bringing-up section temperature is 1120 DEG C in furnace, and slab tapping temperature is 1080 DEG C, and exit temperature at finishing is 880 DEG C, coiling temperature is 700 DEG C, F1 reduction ratio 53.2%, F2 reduction ratio 53.5%, and F7 reduction ratio 14.2% rolls as thickness For the hot rolled plate of 2.5mm:
Step 6), pickling and cold-rolling: being lower than 60 DEG C after after hot rolling plate temperature is 85g/L chlorohydric acid pickling through concentration, and acid tank temperature is 75 DEG C, pickling time is 95 seconds, removes the impurity and iron scale on coil of strip surface, coil of strip after pickling is rolled through cold continuous mill group It is made as 0.50mm thickness coil of strip；
Step 7), cleaning by degreasing, decarburizing annealing
Cleaning by degreasing coil of strip enters continuous decarburization annealing furnace by the coil of strip of cleaning by degreasing, and furnace temperature is set as 900 DEG C, and decarburization is moved back Fiery section keeps temperature uniform using resistance heating, using 85%N2+14%H2+1%H2O as decarburizing annealing atmosphere；
Step 8), coating:
After steel band after Overheating Treatment is come out by quenching cooling apparatus, through water spray cooler adjustment plate temperature, and through squeezing Dry roller compressive surface remnants moisture content, strip enters four-roller coating machine after hot-air drier is dried, and carries out coating using T2 coating, Coated and dried furnace, coating sintering furnace temperature are sintered between 400~450 DEG C, are then cooled to room using air shower cooler Temperature produces the full-technique non-oriented electrical steel 50W800 of surface-brightening.
3. a kind of production method of thin slab continuous casting and rolling production non-oriented electrical steel 50W800, it is characterised in that:
Step 1), molten iron pretreatment: pouring into blast-melted in ladle, carries out blowing magnesium desulfurization by molten iron pretreatment；
Step 2), converter smelting: the molten steel after desulfurization is poured into oxygen top bottom blowing and turned by oxygen top bottom blowing converter Furnace, while the steel scrap for accounting for total weight 10% being added into converter, lime stone, fluorite is added into Converter in converting process, As molten steel composition [C]≤0.06%, [P]≤0.04%, [S]≤0.15% determines oxygen and goes out when Molten Steel End Point is 1680 DEG C Steel；
Step 3), Argon: being added double deoxidizer in converter tapping, the whole Argon in converter tapping process, surveys after Argon Dimension coolant-temperature gage determines oxygen, sampling, and aluminum steel is fed into molten steel according to steel oxygen content in water；
Step 4), RH refining: sending molten steel into vacuum RH refining furnace and smelt, and the alloys such as low-carbon Mn, Al are added and carry out alloying, So that molten steel composition [C]=0.003%, [Si]=0.01%, [Mn]=0.53%, [P]=0.020%, [S]=0.003%, [Al]=0.28%, 1580 DEG C of tapping temperature；The specific method of the RH refining is: molten steel is sent into vacuum RH refining furnace smelting Refining carries out preliminary alloying according to liquid steel temperature, oxygen content and decarburization terminal steel sample ingredient, promotes argon flow control in 140- 170m3/h is first added aluminium block deoxidation, then Als is adjusted to target value, and low-carbon ferromanganese, ferrophosphorus etc. is then added and carries out composition initial adjustment, Alloy recycles 3 minutes under conditions of final vacuum≤130Pa after being added, and thermometric, determines oxygen at sampling；
Step 5), casting: molten steel casts 70mm heavy slab by thin-slab caster, and conticaster pulling rate is 4.0m/min, continuous casting Base charging temperature >=850 DEG C, bringing-up section temperature is 1120 DEG C in furnace, and slab tapping temperature is 1080 DEG C, and exit temperature at finishing is 880 DEG C, coiling temperature is 700 DEG C, F1 reduction ratio 55.2%, F2 reduction ratio 53.3%, and F7 reduction ratio 12.6% rolls as thickness For the hot rolled plate of 2.7mm；
Step 6), pickling and cold-rolling: being lower than 60 DEG C after after hot rolling plate temperature is 85g/L chlorohydric acid pickling through concentration, and acid tank temperature is 75 DEG C, pickling time is 95 seconds, removes the impurity and iron scale on coil of strip surface, coil of strip after pickling is rolled through cold continuous mill group It is made as 0.50mm thickness coil of strip；
Step 7), cleaning by degreasing, decarburizing annealing
Cleaning by degreasing coil of strip enters continuous decarburization annealing furnace by the coil of strip of cleaning by degreasing, and furnace temperature is set as 900 DEG C, and decarburization is moved back Fiery section keeps temperature uniform using resistance heating, using 85%N2+14%H2+1%H2O as decarburizing annealing atmosphere；
Step 8), coating:
After steel band after Overheating Treatment is come out by quenching cooling apparatus, through water spray cooler adjustment plate temperature, and through squeezing Dry roller compressive surface remnants moisture content, strip enters four-roller coating machine after hot-air drier is dried, and carries out coating using T2 coating, Coated and dried furnace, coating sintering furnace temperature are sintered between 400~450 DEG C, are then cooled to room using air shower cooler Temperature produces the full-technique non-oriented electrical steel 50W800 of surface-brightening.
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