CN106399822B - A kind of Hi-B steel manufactured using intrinsic inhibitor method and slab low-temperature heat technique - Google Patents
A kind of Hi-B steel manufactured using intrinsic inhibitor method and slab low-temperature heat technique Download PDFInfo
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Abstract
The invention belongs to silicon steel production technical field, in particular to a kind of Hi-B steel manufactured using intrinsic inhibitor method and slab low-temperature heat technique.The Hi-B molten steel chemical component indicates by mass percentage are as follows: C:0.04~0.065%, Si:3.1~3.3%, Mn:0.08~0.60%, P:0.01~0.03%, S≤0.01%, Als:0.025~0.055%, N:0.007~0.013%, Cu:0.10~1.0%；The Hi-B steel is prepared using sulfide as auxiliary inhibitor, and using slab low-temperature heat technique.The present invention not only uses low-temperature heat to slab, but also technique adaptation range is wide in range, and rejection ability is sufficient, the Hi-B steel obtained using the present invention, wherein B8Value is up to 1.988T, P17/50Down to 0.836W/kg.
Description
Technical field
The invention belongs to silicon steel production technical fields, in particular to a kind of to use intrinsic inhibitor method and slab low-temperature heat
The Hi-B steel of technique manufacture.
Background technique
Orientation silicon steel refers to the 3%Si-Fe soft magnetic materials with single { 110 }<001>texture (i.e. Goss texture).Due to
Its production technology is complicated, manufacturing technology is more stringent, so being commonly referred to as " art work " in steel material.Currently, more at
The technique of ripe production Hi-B steel mainly has: first is that producing Hi-B steel using " intrinsic inhibitor+slab elevated heating processes "；JFE
The technical solution important technological parameters feature of the production orientation silicon steel of proposition has: for AlN+Sb+MnSe as inhibitor, slab is main
Ingredient (mass fraction %) is C0.03~0.055, Si2.9~3.3, Als0.007~0.02, Mn0.06~0.08, N0.004
~0.008, S0.002~0.005, Se≤0.014, Sb0.01~0.045, S+Se < 0.02 can be added in steel as needed
A small amount of B, Nb, Bi or Sn.The temperature for heating slab is 1150~1250 DEG C, tetra- total reduction > of finish rolling Qian in course of hot rolling
90%, 900 DEG C of the finishing temperature > of selection, subsequent hot plate will use cold continuous rolling through 900~1050 DEG C × 60s normalizing, cold rolling
Machine simultaneously keeps 150~200 DEG C of temperature to drop normalizing plate once cold rolling to finished product thickness.Baosteel is produced using intrinsic inhibitor method
The important technological parameters feature of Hi-B steel are as follows: first is that being used as inhibitor, slab main component using (Cu2S/ ε-Cu)+AlN+Sn
(mass fraction %) be Si2.9~3.5, C0.055~0.08, Cu0.1~0.2, Mn0.01~0.02, Als0.01~0.015,
S0.005~0.01, N0.005~0.009, Sn0.25~0.5, P0.01~0.035.The heating temperature of slab 1200~
Between 1250 DEG C, course of hot rolling include 3 passage roughing and 3~6 passage finish rolling, 1030~1060 DEG C of the outlet temperature of roughing, and
It keeps 10~15s to wait during roughing per pass, guarantees that the first percentage pass reduction of finish rolling is 80~85%, finishing temperature
Control is 1000~1020 DEG C, and by water-spraying control to 850 DEG C after hot rolling, then gradually slow cooling starts to batch to 700 ± 30 DEG C.
The production technology of Baosteel eliminates the normalizing stage, and hot rolled plate once cold rolling method is rolled to finished product thickness, cold rolling total reduction >
90%.
Second is that nippon research and development use acquisition type using " acquisition type inhibitor method+slab low-temperature heat technique "
The important technological parameters feature that inhibitor (nitriding after first decarburization) produces Hi-B steel is as described below: using (Al, Si) N+MnS+Sn
As the inhibitor of Hi-B steel, the main component (mass fraction %) of slab is Si3.2~3.4, C0.05~0.06, P0.015
~0.035, Mn0.13~0.16, S≤0.005, N0.005~0.006, Als0.025~0.035, the Als in steel will meet
Al- (27/14) N > 0.01, in addition, B0.003~0.004, Cr0.15~0.20 or Sn0.05~0.10 can be added in steel.When
When C content in steel is constant, the content of Si be can be improved to 3.5~4.0, at the same to control the ratio of Al/Si at least more than
0.008, the low melting point elements such as Bi0.005~0.01, which are added, in steel can be improved the magnetic induction density B 8 of Hi-B steel.Heating of plate blank
Temperature control within the scope of 1150~1250 DEG C, to control in the hot rolling finish rolling last 3 passage it is total reduction ratio it is big
In 40%, last 1 percentage pass reduction is greater than 20%, and the finishing temperature of controlled rolling is 900~950 DEG C, 550~600 DEG C of temperature
It is batched.And by Hot Rolled Plate Normalizing, use once cold rolling method by normalizing plate once cold rolling to finished product thickness, cold rolling after regular practice
Ageing treatment is used in the process.After 800~850 DEG C of progress decarburizing annealing, and then carries out 750~800 DEG C × 30~60s and seep
Nitrogen processing, nitriding amount are 150~200ppm.First average grain size control is between 18~30 μm after decarburizing annealing.High temperature
It anneals in temperature-rise period, nitriding product is put into annealing furnace by annealing atmosphere 25%N2+H2, and annealing furnace is with the liter of 30 DEG C/h
Warm rate is warming up to 700~850 DEG C, and carries out 5~10h heat preservation, and the heat preservation main function in this stage is to make unstable nitridation
Object is dissolved and is spread uniformly.
Pu steel processed produces the technical solution feature of Hi-B steel using acquisition type inhibitor (synchronous decarburization and nitriding) scheme
Are as follows: use AlN+Cu2Inhibitor of the S+BN as Hi-B steel, slab main component (mass fraction %) be Si2.9~3.3,
C0.02~0.045, S≤0.006, Mn0.09~0.24, B0.003~0.008, Als0.013~0.019, Cu0.3~0.7,
N0.003~0.008, Cr0.03~0.07, Ni0.03~0.07, P≤0.015.C content in ingredient is reduced, Cu is properly increased and contains
Amount, and a certain amount of Ni, Cr is added, be conducive to decarburizing annealing progress synchronous with Nitrizing Treatment.Heating slab temperature be
1050~1250 DEG C, after slab hot rolling, by hot rolled plate high temperature normalizing treatment, cold rolling is carried out through pickling after normalizing treatment, is used
Once cold rolling method (reduction ratio be 84~90%) is by normalizing plate once cold rolling to 0.23~0.35mm.Synchronizing nitridation process is,
Decarburization and nitrogen treatment simultaneously are carried out at 850~950 DEG C, the synchronization process time is 120~185s.After Nitrizing Treatment, in steel
Total N content controls the average crystal grain of primary recrystallization within the scope of 130~82.9 { 1+ [Cu%+10 × (Ni%+Cr%)] 2 } ppm
Size Control is in 20~30 μ ms.
Baosteel produces the technical solution feature of Hi-B steel using acquisition type inhibitor (decarburization after nitriding) are as follows: uses AlN+
Cu2Inhibitor of the S+Sn as production Hi-B steel, the main component (mass fraction %) of slab are Si2.95~3.50, C0.04
~0.06, Mn0.08~0.18, Als0.015~0.035, N0.005~0.009, Cu0.05~0.12, P0.01~0.03,
S0.005~0.009, Sn0.01~0.15.The heating temperature of slab is 1100~1200 DEG C, controls the finishing temperature 900 of hot rolling
~920 DEG C, and batched at 500~520 DEG C of temperature.After hot rolling, hot rolled plate is subjected to normalizing by two-part normalizing furnace
Processing, and normalizing plate is cold-rolled to by finished product thickness using once cold rolling method.The acquisition type inhibitor scheme of Baosteel research and development, by cold rolling
Plate first carries out 800~900 DEG C × 5~50s Nitrizing Treatment, and (when 850 DEG C of nitridings, target is about in 50~200ppm for control nitriding amount
120ppm) in range, decarburizing annealing is then carried out at 800~900 DEG C of temperature, will form part during decarburizing annealing
(Al, Si) N inhibitor.
Hi-B steel is produced using " intrinsic inhibitor+slab elevated heating processes ", since high-temperature heating makes as inhibitor
The coarse precipitated phase such as AlN, MnS can be dissolved completely in slab, be then sufficiently precipitated, can meet in hot rolling and normalizing process
Requirement of the inhibitor to primary recrystallization normal grain growth is inhibited.But since slab heating temperature is excessively high, cause energy waste,
The disadvantages of shortened equipment life, surface defects of products increase, lumber recovery is low, and manufacturing cost increases.By dividing documents and materials
From the point of view of analysis, the research and development coke that Hi-B steel has become major orientation silicon steel factory, the world is manufactured using slab low-temperature heat technique
Point.Currently, since soaking temperature is lower, inhibitor precipitated phase can not be dissolved completely, hot rolling using slab low-temperature heat technique
After normalizing, the intrinsic inhibitor quantity being precipitated in steel may be insufficient, is unable to satisfy the requirement for inhibiting first normal grain growth,
There is a problem of rejection ability deficiency.It mostly uses both at home and abroad at present " acquisition type inhibitor method+slab low-temperature heat technique ", i.e.,
(Al, Si) N or AlN precipitated phase of new small and dispersed is obtained, by Nitrizing Treatment to make up the quantitative deficiency of inhibitor.
But Hi-B steel is produced using Nitrizing Treatment, not only construction or transformation decarburization and the investment of nitriding production line are very big, but also make
Production technology becomes more complicated, and decarburization and the control of nitridation process are very harsh.
In orientation silicon steel course of hot rolling, suitable γ phase content (20%~30%) is adjusted, it can by γ → α phase transition process
Make hot rolled plate structure refinement and be in the thin deformation crystal grain and tiny recrystal grain of layered distribution, to be conducive to move back in decarburization
The primary recrystallization crystal grain that fine uniform is formed after fire promotes secondary recrystallization development.When γ phase < 20%, easily there is line in finished product
Crystalline substance, easily there are small grains in finished product when γ phase > 30%, this all makes secondary recrystallization not perfect.Further, since AlN, MnS and
Cu2Solubility product difference of the inhibitor such as S in α phase and γ phase is larger.Especially in the production process of Hi-B steel, certain
γ phase content can guarantee that suitable N is dissolved in γ phase, and a large amount of tiny AlN are obtained in the rapid cooling of subsequent normalizing process,
Nitrogen in γ phase solid solubility ratio big 10 times or so in α phase.Based on the above analysis, the present invention is designed by Hi-B composition of steel, is controlled
γ phase content in steel processed proposes a kind of Hi-B steel manufactured by " intrinsic inhibitor method+slab low-temperature heat " technique, by
To currently, yet there are no document report.
Summary of the invention
It is an object of the invention to overcome the traditional slab low-temperature heat technique of existing use, the intrinsic inhibitor being precipitated in steel
Hypodynamic problem can not produce Hi-B steel；Meanwhile overcome using obtain inhibitor method production technology it is more complicated, control it is severe
The problems such as quarter, provides a kind of Hi-B steel manufactured using intrinsic inhibitor method and slab low-temperature heat technique, preferentially by ingredient
γ phase content in design, the reasonable combination of inhibitor and control steel, obtains a kind of Hi-B steel of fine magnetic property.
To achieve the goals above, the present invention provides the following technical scheme that
The present invention provides a kind of Hi-B steel produced using intrinsic inhibitor method and slab low-temperature heat technique, the Hi-B
The chemical component of steel slab indicates by mass percentage are as follows: C:0.04~0.065%, Si:3.1~3.3%, Mn:0.08~
0.60%, P:0.01~0.03%, S≤0.01%, Als:0.025~0.055%, N:0.007~0.013%, Cu:0.10~
1.0%, remaining is Fe；
The Hi-B steel is prepared using sulfide as auxiliary inhibitor, and using slab low-temperature heat technique；
In the standby hot-rolled step of the Hi-B steel, control γ phase content is 20%~30%.
Relationship in the Hi-B steel between γ phase content and C, Si, Mn constituent content and hot-rolled temperature T is as follows:
The sulfide is MnS and Cu2S。
The Hi-B steel is prepared using following processing step: converter smelting → RH refining → continuous casting → heating of plate blank → hot rolling
→ normalizing → cold rolling → decarburizing annealing → high annealing.
The B of the Hi-B steel8Value is up to 1.988T, P17/50Down to 0.836W/kg.
Compared with prior art, the beneficial effects of the present invention are:
(1) present invention has adjusted the quantity that Hi-B steel Si, Mn constituent content suitably to increase γ phase, reduces equal thermal process
The Equilibrium Precipitation amount of AlN increases the amount of precipitation of effective AlN during hot rolling and normalizing, and main inhibitor AlN is to first in raising steel
The big rejection ability of para-crystal grain length.
(2) present invention especially increases the content of C, and C is austenite stabilizer element, and the increase of C element content will reduce
A3 temperature promotes A4 temperature, and then can expand the range of γ phase region.Suitable γ phase content (20%~30%) is adjusted, is led to
Hot rolled plate structure refinement and thin deformation crystal grain and tiny recrystal grain in layered distribution can be made by crossing γ → α phase transition process,
Promote secondary recrystallization development.
(3) compared with prior art, the present invention not only using low-temperature heat to slab, but also technique adaptation range is wide in range,
Rejection ability is sufficient, the Hi-B steel obtained using the present invention, wherein B8Value is up to 1.988T, P17/50Down to 0.836W/kg.
Specific embodiment
The present invention will be further described below in conjunction with the embodiments.
The present invention provides a kind of Hi-B steel produced using intrinsic inhibitor method and slab low-temperature heat technique, the Hi-B
Steel chemical composition indicates by mass percentage are as follows: C:0.04~0.065%, Si:3.1~3.3%, Mn:0.08~0.60%, P:
0.01~0.03%, S≤0.01%, Als:0.025~0.055%, N:0.007~0.013%, Cu:0.10~1.0%,
Remaining is Fe.
Sulfide (MnS and Cu are generally used in the Hi-B steel2S) it is used as auxiliary inhibitor；Wherein, MnS is traditional high
The auxiliary inhibitor used in warm process production Hi-B steel, Mn content general control are 0.08~0.60%；Cu2S is that low temperature adds
Thermal process produces common auxiliary inhibitor in Hi-B steel, and appropriate Cu content (0.10~1.0%) is added into steel, not only can be with
Cu is formed in conjunction with S2S improves rejection ability, can also play the role of increasing γ phase amount in steel, to improve AlN in steel
In solid solubility.
γ phase content in the Hi-B steel is controlled, the relationship between γ phase content and C, Si, Mn constituent content and temperature T is such as
Under:
The Hi-B steel is prepared using following processing step: converter smelting → RH refining → continuous casting → heating of plate blank → hot rolling
→ normalizing → cold rolling → decarburizing annealing → high annealing.
The Hi-B steel uses converter smelting, the operation of full molten iron or ferroalloy used without being mingled with and such as lead has coloured gold
Belong to, Tapping Temperature of Bof is controlled at 1660~1680 DEG C.
It is finely tuned in RH refining process using alloy twice, amount of leakage < 25Kg of vacuum pump system, vacuum degree≤266Pa.RH
The control of molten steel start temperature is handled at 1600~1680 DEG C, processing outlet temperature control is at 1500~1580 DEG C.
In continuous casting process, middle packet refractory material, crystallizer submersed nozzle etc. uses Carbon-free refractories；
Long nozzle uses blowing argon；
Normal casting 4~5 minutes, 20 minutes, 35 minutes, carry out thermometric respectively；
Thermocouple insertion depth is 145~160mm, it is necessary to which insertion is intermediate, and temperature measuring head answers >=250mm away from surrounding wall；
Long nozzle must be worn by opening when pouring carries out the casting of long nozzle blowing argon, Argon pressure: 0.10~0.25Mpa.
Continuous casting finishes, forbid big Baogang's slag enter in packet (connect pour third tank every time when, middle packet will carry out a deslagging) close
Closing slide plate will slowly, and molten steel cutout stops immediately, whole cannot close, 0.5~4.0m/min of drawing speed.
Steel pouring process must keep mold liquid level to balance, and tundish, crystallizer are all made of mould flux, and using electricity
Magnetic stirring, stirring parameter: 760~785A/15~18Hz/5s-0-5s.
Heating of plate blank will guarantee soaking, be dissolved inhibitor sufficiently, while will not slab edge crack.Slab heating: add
1150~1200 DEG C, 0.1~4.5h of heating time, 0.1~5h of time inside furnace of hot temperature；
The start rolling temperature of hot rolling is controlled at 1150~1180 DEG C, and finishing temperature is about 900~920 DEG C.Hot rolling plate thickness,
2.0~2.5mm, uses asymmetrical rapid cooling after the completion of rolling, coolant water temperature is controlled at 30~60 DEG C, with about 25~35
DEG C/cooling rate of s is cooled to 560~600 DEG C, it then batches rapidly and is put into low-temperature insulation furnace.In hot-rolled step, γ phase is controlled
Content is 20%~30%.
Using two-part normalizing, first segment quickly heats up to 850~1150 DEG C under nitrogen atmosphere and keeps the temperature 10~300s,
Steel plate is heated to 600~900 DEG C by second segment, keeps the temperature 10~300s, and use Water Quenching, 1~90s of water quenching time.
Cold rolling is using timeliness rolling mill practice once cold rolling to product specific thickness.
After once cold rolling, cold-reduced sheet is in 5~30%H2+ 95~70%N2Dew point be carry out 750 under 10~60 DEG C of atmosphere~
850 DEG C × 0.5~5min decarburizing annealing, carbon content is down to 0.002~0.004% hereinafter, drying after coating and carrying out height at this time
Temperature annealing.
High annealing, it is characterised in that atmosphere used is 20~80%H2+ 80~20%N2, heating rate be 10~40 DEG C/
H raises the temperature to 1100~1250 DEG C, and 10~30h is kept the temperature in pure hydrogen atmosphere.Cooling come out of the stove applies stress coat and obtains
Finished product.
C element content is 0.04~0.065% in the Hi-B steel, and C content is excessively high, it is difficult will to bring decarburization, and make
The unfavorable factors such as sulfide solid solubility temperature raising in steel.C element plays a significant role in Hi-B steel, and improving C content can make
γ phase increases in steel, on the one hand can make hot rolled plate structure refinement by γ → α phase transition process in course of hot rolling and form stratiform
The tiny deformation crystal grain and recrystal grain of distribution, to make first uniform small grains；It on the other hand can be in normalizing process
A large amount of tiny AlN particles are precipitated when rapid cooling, increase the rejection ability grown up to first crystal grain.Furthermore the C atom being dissolved in steel is also
Can in the cold rolling timeliness operation of rolling pinning dislocation so that dislocation density obviously increases, faster, when annealing, recrystallizes processing hardening
Raw nuclear location increases, first uniform small grains, promotes secondary recrystallization development.
Si constituent content is 3.1~3.3% in the Hi-B steel.Si element is the essential element in orientation silicon steel, Si energy
It plays and significantly improves resistivity, reduce eddy-current loss, reduce the effect of iron loss, often increase 0.1%Si, iron loss P can be made17/50Drop
Low 0.019W/kg.But Si too high levels, material process (mainly cold rolling) difficulty, and hot rolled plate organizational coarseness makes the inhibition being precipitated
Agent is coarse, and quantity is reduced, and rejection ability is substantially reduced, and secondary recrystallization is difficult, is unsuitable for industrial production.
P element content is 0.01~0.03% in the Hi-B steel.When there are a small amount of P elements along crystal boundary segregation in steel
When, the particle that the inhibitor of precipitation is precipitated is tiny and is more evenly distributed, and rejection ability is enhanced, and P improves resistivity, at
Product magnetic property is good and stablizes, P17/50Also decline.
Als content is 0.025~0.055% in the Hi-B steel, and controls N content 0.007~0.013% in steel.Als
Content is most obvious to effect of magnetic influence, Als too high levels, and slab heating temperature increases, and glass film quality degenerates, Als content mistake
Low, the AlN being precipitated in steel is very little, and restraint is insufficient, and secondary recrystallization is not perfect.
Embodiment 1
Embodiment 1 is using ingredient in table 1 as raw material, using converter smelting, 1650 DEG C of Tapping Temperature of Bof.
RH refining is finely tuned using alloy twice, amount of leakage < 25Kg of vacuum pump system, vacuum degree≤266Pa.RH handles steel
1635 DEG C of liquid start temperature, handle 1565 DEG C of outlet temperature.
In continuous casting process, middle packet refractory material, crystallizer submersed nozzle etc. uses Carbon-free refractories.Long nozzle is adopted
With blowing argon, normally cast 4~5 minutes, 20 minutes, 35 minutes carry out thermometric respectively, and thermocouple insertion depth is 145mm,
It must be inserted into centre, temperature measuring head answers >=250mm away from surrounding wall.Long nozzle progress long nozzle blowing argon must be worn by opening when pouring pours
Casting, Argon pressure: 0.15Mpa.Continuous casting finishes, forbid big Baogang's slag enter in packet (connect when pouring third tank every time, middle packet will carry out
Deslagging) close slide plate will slowly, molten steel cutout stops immediately, whole cannot close, drawing speed 0.6m/min.Pour steel mistake
Cheng Bixu keeps mold liquid level balance, and tundish, crystallizer are all made of mould flux, and use electromagnetic agitation, and electromagnetism stirs
Mix parameter: 767A/15Hz/5s-0-5s.
Heating of plate blank will guarantee soaking during heating of plate blank, be dissolved inhibitor sufficiently, at the same will not slab edge open
It splits, 1200 DEG C of slab heating temperature, time inside furnace 280 minutes.
Hot rolling start rolling temperature is controlled at 1165 DEG C, and finishing temperature is about 900 DEG C.Hot rolling plate thickness 2.0mm, after the completion of rolling
Using asymmetrical rapid cooling, coolant water temperature is controlled at 40 DEG C, is cooled to 560 DEG C with the cooling rate of about 30 DEG C/s, then rapidly
It batches and is put into low-temperature insulation furnace.In hot-rolled step, control γ phase content is 20%~30%,.
Using two-part normalizing, first segment quickly heats up to 1120 DEG C in a nitrogen atmosphere and keeps the temperature 120s, and second segment will
Steel plate is heated to 850 DEG C, keeps the temperature 60s, and use Water Quenching, water quenching time 20s.
Using timeliness rolling mill practice once cold rolling 0.30mm.
After once cold rolling, cold-reduced sheet is in 20%H2+ 80%N2Dew point is that 800 DEG C × 5min decarburization is carried out under 40 DEG C of atmosphere
Annealing, carbon content is down to 0.004% hereinafter, drying after coating and carrying out high annealing at this time.
Atmosphere used in high annealing is 60%H2+ 40%N2, heating rate is 25 DEG C/h, 1210 DEG C are raised the temperature to,
25h is kept the temperature in pure hydrogen atmosphere.Cooling come out of the stove applies stress coat and obtains finished product.Finished product is averaged magnetic strength value B8For 1.908T, put down
Equal core loss value P17/50For 1.161W/kg.
Wherein, above-mentioned γ phase content is the area percent detected after the forged sample preparation of slab, and specific method for making sample is: adopting
With vacuum induction furnace smelting, slab is reheated to 1150 DEG C after being air-cooled to room temperature and keeps the temperature 10min, is forged into the circle of Φ 20mm
The cylinder sample of 10 × 2mm of Φ is made in stick after wire cutting.Since experiment heating temperature is between 900~1300 DEG C, in order to anti-
Only sample causes C content to change in high-temperature heating process due to oxidation, guarantees the accuracy of test result, sample is sealed
In silica valve.
Embodiment 2
2 ingredient of embodiment is as shown in table 1, remaining step is same as Example 1.
Finished product is averaged magnetic strength value B8For 1.936T, average core loss value P17/50For 1.057W/kg.
Embodiment 3
(1) 3 ingredient of embodiment is as shown in table 1, and 1660 DEG C of Tapping Temperature of Bof.
(2) RH refining is finely tuned using alloy twice, amount of leakage < 25Kg of vacuum pump system, vacuum degree≤266Pa.At RH
1640 DEG C of molten steel start temperature of reason handles 1570 DEG C of outlet temperature.
(3) in continuous casting process, middle packet refractory material, crystallizer submersed nozzle etc. uses Carbon-free refractories.Long water
Mouth uses blowing argon, and normally cast 4~5 minutes, 20 minutes, 35 minutes carry out thermometric, thermocouple insertion depth is respectively
145mm, it is necessary to which insertion is intermediate, and temperature measuring head answers >=250mm away from surrounding wall.Long nozzle must be worn by opening when pouring carries out long nozzle Argon
Protective casting, Argon pressure: 0.15Mpa.Continuous casting finishes, forbid big Baogang's slag enter in packet (connect when pouring third tank every time, middle packet
Carry out a deslagging) close slide plate will slowly, molten steel cutout stops immediately, whole cannot close, drawing speed 0.6m/min.
Steel pouring process must keep mold liquid level to balance, and tundish, crystallizer are all made of mould flux, and use electromagnetic agitation,
Stirring parameter: 780A/15Hz/5s-0-5s.
(4) soaking will be guaranteed by heating during heating of plate blank, be dissolved inhibitor sufficiently, at the same will not slab edge open
It splits.1210 DEG C of slab heating temperature, time inside furnace 290 minutes.
(5) for the control of hot rolling start rolling temperature at 1180 DEG C, finishing temperature is about 920 DEG C.Hot rolling plate thickness 2.3mm, has rolled
Asymmetrical rapid cooling is used at rear, coolant water temperature is controlled at 30 DEG C, is cooled to 580 DEG C with the cooling rate of about 30 DEG C/s, then
It batches rapidly and is put into low-temperature insulation furnace.
(6) two-part normalizing is used, first segment quickly heats up to 1120 DEG C in a nitrogen atmosphere and keeps the temperature 150s, and second
Steel plate is heated to 900 DEG C by section, keeps the temperature 60s, and use Water Quenching, water quenching time 15s.
(7) timeliness rolling mill practice once cold rolling 0.30mm is used.
(8) after once cold rolling, cold-reduced sheet is in 30%H2+ 70%N2Dew point is to carry out 835 DEG C × 3min under 45 DEG C of atmosphere to take off
Carbon annealing, carbon content is down to 0.003% hereinafter, drying after coating and carrying out high annealing at this time.
(9) atmosphere used in high annealing is 70%H2+ 30%N2, heating rate is 30 DEG C/h, raises the temperature to 1210
DEG C, 30h is kept the temperature in pure hydrogen atmosphere.Cooling come out of the stove applies stress coat and obtains finished product.Finished product is averaged magnetic strength value B8For
1.988T, average core loss value P17/50For 0.836W/kg.
Table 1 tests steel chemical composition (%)
Table 2 tests γ phase content and magnetic property in steel
Claims (2)
1. a kind of Hi-B steel produced using intrinsic inhibitor method and slab low-temperature heat technique, it is characterised in that: the Hi-B
The chemical component of steel slab indicates by mass percentage are as follows: C:0.04~0.065%, Si:3.1~3.3%, Mn:0.08~
0.60%, P:0.01~0.03%, S≤0.01%, Als:0.025~0.055%, N:0.007~0.013%, Cu:0.10~
1.0%, remaining is Fe；
The Hi-B steel is prepared using following processing step: converter smelting → RH refining → continuous casting → heating of plate blank → hot rolling → often
Change → cold rolling → decarburizing annealing → high annealing；Specific process step are as follows:
1) converter smelting:
Non-ferrous metal is not mingled with using the operation of full molten iron or ferroalloy used, Tapping Temperature of Bof is controlled 1660~1680
℃；
2) RH is refined:
It is finely tuned using alloy twice, amount of leakage < 25kg of vacuum pump system, vacuum degree≤266Pa；RH handles molten steel start temperature
Control is at 1600~1680 DEG C, and processing outlet temperature control is at 1500~1580 DEG C；
3) continuous casting:
In continuous casting process, middle packet refractory material, crystallizer submersed nozzle uses Carbon-free refractories；Long nozzle uses Argon
Protection；Argon pressure: 0.10~0.25MPa；0.5~4.0m/min of drawing speed；
4) heating of plate blank
Using sulfide as auxiliary inhibitor, and low-temperature heat is carried out to slab, guarantees soaking, be dissolved inhibitor sufficiently,
It simultaneously will not slab edge crack；1150~1200 DEG C of heating temperature, 0.1~4.5h of heating time, 0.1~5h of time inside furnace；
5) hot rolling:
At 1150~1180 DEG C, finishing temperature is 900~920 DEG C for start rolling temperature control；Hot rolling 2.0~2.5mm of plate thickness, rolling
Asymmetrical rapid cooling is used after the completion, and coolant water temperature is controlled at 30~60 DEG C, is cooled to 560 with the cooling rate of 25~35 DEG C/s
It~600 DEG C, then batches rapidly and is put into low-temperature insulation furnace；In hot-rolled step, control γ phase content is 20%~30%；Institute
The relationship stated in Hi-B steel between γ phase content and C, Si, Mn constituent content and hot-rolled temperature T is as follows:
When 900 DEG C≤T < 920 DEG C:
γ (%)=(8.294 × 10-4·T2-1.390·T+585.789)+(-6.860×10-3·T2+14.088·T-
6890.993) [C%]+(- 2.346 × 10-4·T2+3.933×10-1T-166.376) [Si%]+(3.733 × 10-4·T2-
6.371×10-1T+272.398) [Mn%]
When 1150 DEG C≤T≤1300 DEG C:
γ (%)=(- 1.820 × 10-3·T2+4.057·T-2189.388)+(-9.260×10-3·T2+18.949·T-
9341.476) [C%]+(5.936 × 10-4·T2- 1.308T+699.994) [Si%]+(- 1.578 × 10-4·T2+4.593
×10-1T-288.713) [Mn%]
6) normalizing:
Using two-part normalizing, first segment quickly heats up to 850~1150 DEG C under nitrogen atmosphere and keeps the temperature 10~300s, and second
Steel plate is heated to 600~900 DEG C by section, keeps the temperature 10~300s, and use Water Quenching, 1~90s of water quenching time；
7) cold rolling:
Cold rolling is using timeliness rolling mill practice once cold rolling to product specific thickness；
8) decarburizing annealing:
After once cold rolling, cold-reduced sheet is in 5~30%H2+ 95~70%N2Dew point is that 750~850 are carried out under 10~60 DEG C of atmosphere
DEG C × 0.5~5min decarburizing annealing, carbon content is down to 0.002~0.004% hereinafter, drying after coating and carrying out high temperature and move back at this time
Fire；
9) high annealing:
Atmosphere used is 20~80%H2+ 80~20%N2, heating rate is 10~40 DEG C/h, raise the temperature to 1100~
1250 DEG C, 10~30h is kept the temperature in pure hydrogen atmosphere；Cooling come out of the stove applies stress coat and obtains finished product；
The B of the Hi-B steel8Value is up to 1.988T, P17/50Down to 0.836W/kg.
2. the Hi-B steel according to claim 1 produced using intrinsic inhibitor method and slab low-temperature heat technique, special
Sign is: the sulfide is MnS and Cu2S。
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