CN106399822A - Hi-B steel produced using intrinsic inhibitor method and casting blank low-temperature heating process - Google Patents
Hi-B steel produced using intrinsic inhibitor method and casting blank low-temperature heating process Download PDFInfo
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Abstract
The present invention belongs to the technical field of silicon steel production, and in particular relates to a Hi-B steel produced using an intrinsic inhibitor method and a casting blank low-temperature heating process. The liquid Hi-B steel contains the following chemical components in mass percent: 0.04-0.065% of C, 3.1-3.3% of Si, 0.08-0.60% of Mn, 0.01-0.03% of P, less than or equal to 0.01% of S, 0.025-0.055% of Als, 0.007-0.013% of N, and 0.1-1.0% of Cu. The Hi-B is prepared with a sulfide serving as an auxiliary inhibitor and by means of the casting blank low-temperature heating process. According to the present invention, not only is low-temperature heating used for a casting blank, but also the process is wide in application range and sufficient in inhibition capability; and the Hi-B steel obtained according to the present invention has a value of B8 as high as 1.988T, and a value of P17/50 as low as 0.836W/kg.
Description
Technical field
The invention belongs to silicon steel production technical field, adopt intrinsic inhibitor method particularly to a kind of
The Hi-B steel manufacturing with strand low-temperature heat technique.
Background technology
Orientation silicon steel refers to there is single { 110 }<001>The 3%Si-Fe of texture (i.e. Goss texture)
Soft magnetic materials.Because its complex manufacturing, manufacturing technology are more strict, so being commonly referred to as
" art work " in ferrous materials.At present, the more ripe technique producing Hi-B steel mainly has：
One is to produce Hi-B steel using " intrinsic inhibitor+strand elevated heating processes "；JFE proposes
The technical scheme important technological parameters feature producing orientation silicon steel has：AlN+Sb+MnSe is as suppression
Preparation, strand main component (mass fraction %) be 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, as needed, can add a small amount of B, Nb, Bi in steel
Or Sn.The temperature of heating strand is 1150～1250 DEG C, and in course of hot rolling, finish rolling Qian tetra- road is total
Reduction ratio ＞ 90%, 900 DEG C of finishing temperature ＞ of selection, subsequent hot plate will be through 900～1050 DEG C
× 60s normalizing, cold rolling employing cold continuous rolling simultaneously keeps 150～200 DEG C of temperature to drop normalizing plate once
It is cold-rolled to finished product thickness.Baosteel adopts intrinsic inhibitor method to produce the important technological parameters of Hi-B steel
It is characterized as：One is as inhibitor, strand main component (matter using (Cu2S/ ε-Cu)+AlN+Sn
Amount fraction %) for 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.
Between 1200～1250 DEG C, course of hot rolling includes 3 passage roughing and 3～6 to the heating-up temperature of strand
Passage finish rolling, 1030～1060 DEG C of the outlet temperature of roughing, and keep during every time in roughing
10～15s waits it is ensured that the first percentage pass reduction of finish rolling is 80～85%, and finishing temperature control is
1000～1020 DEG C, after hot rolling, pass through water-spraying control to 850 DEG C, then progressively slow cooling to 700 ±
30 DEG C start to batch.The production technology of Baosteel eliminates the normalizing stage, by hot rolled plate once cold rolling
Method is rolled to finished product thickness, cold rolling total reduction ＞ 90%.
Two is that nippon grinds using " acquisition type inhibitor method+strand low-temperature heat technique "
Employing acquisition type inhibitor (nitriding after first decarburization) sent out produces the important technological parameters of Hi-B steel
Feature is as described below：Using (Al, Si) N+MnS+Sn as Hi-B steel inhibitor, slab
Main component (mass fraction %) be 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
Al- (27/14) N ＞ 0.01 to be met, in addition, can in steel plus B0.003～0.004,
Cr0.15～0.20 or Sn0.05～0.10.When the C content in steel is constant, the content of Si can carry
Up to 3.5～4.0, the ratio of Al/Si to be controlled is at least above 0.008 simultaneously, adds in steel
Bi0.005～0.01 grade low melting point element can improve the magnetic induction density B 8 of Hi-B steel.Heating of plate blank
Temperature control within the scope of 1150～1250 DEG C, last the 3 of finish rolling to be controlled in the hot rolling
The total reduction ratio of passage is more than 40%, and last 1 percentage pass reduction is more than 20%, controlled rolling
Finishing temperature is 900～950 DEG C, and 550～600 DEG C of temperature is batched.And by Hot Rolled Plate Normalizing,
Adopt once cold rolling method by normalizing plate once cold rolling to finished product thickness after regular practice, in cold-rolled process
Using Ageing Treatment.After carrying out decarburizing annealing at 800～850 DEG C, and subsequently carry out 750～800 DEG C
× 30～60s Nitrizing Treatment, nitriding amount is 150～200ppm.After decarburizing annealing, first crystal grain is average
Size Control is between 18～30 μm.In high annealing temperature-rise period, annealing atmosphere is
25%N2+H2, nitriding product is put in annealing furnace, and annealing furnace is with the heating rate of 30 DEG C/h
It is warming up to 700～850 DEG C, and carries out 5～10h insulation, the insulation Main Function in this stage is to make not
Stable nitride dissolves and spreads uniformly.
Pu item steel adopts acquisition type inhibitor (synchronous decarburization and nitriding) scheme to produce Hi-B steel
Technical scheme be characterized as：Using AlN+Cu2S+BN is as the inhibitor of Hi-B steel, strand
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.Reduce C content in composition, properly increase
Cu content, and add a certain amount of Ni, Cr, be conducive to decarburizing annealing and the synchronization of Nitrizing Treatment
Carry out.The temperature of heating slab is 1050～1250 DEG C, after slab hot rolling, by hot rolled plate high temperature
Normalizing treatment, carries out cold rolling through pickling after normalizing treatment, using once cold rolling method, (reduction ratio is
84～90%) by normalizing plate once cold rolling to 0.23～0.35mm.Synchronous nitridation process is,
Carry out decarburization simultaneously and nitrogen treatment, the synchronization process time is 120～185s when 850～950 DEG C.Warp
After Nitrizing Treatment, in steel, total N content controls in 130～82.9 { 1+ [Cu%+10 × (Ni%+Cr%)] 2 }
In the range of ppm, the average grain size of primary recrystallization controls in 20～30 μ m.
Baosteel adopts acquisition type inhibitor (decarburization after nitriding) to produce the technical scheme spy of Hi-B steel
Levy for：Using AlN+Cu2S+Sn is as the inhibitor producing Hi-B steel, the main one-tenth of strand
Point (mass fraction %) is 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-up temperature of strand is 1100～1200 DEG C, controls the finishing temperature of hot rolling
900～920 DEG C, and batched in 500～520 DEG C of temperature.After hot rolling, hot rolled plate is passed through
Two-part normalizing furnace carries out normalizing treatment, and using once cold rolling method, normalizing plate is cold-rolled to finished product
Thickness.Baosteel research and development acquisition type inhibitor scheme, cold-reduced sheet is first carried out 800～900 DEG C ×
5～50s Nitrizing Treatment, (during 850 DEG C of nitridings, target is about in 50～200ppm to control nitriding amount
In the range of 120ppm), subsequently carry out decarburizing annealing, decarburizing annealing in 800～900 DEG C of temperature
During will forming part (Al, Si) N inhibitor.
Hi-B steel is produced using " intrinsic inhibitor+strand elevated heating processes ", due to high temperature
Heating enables thick precipitated phase complete solid solutions in strand such as AlN, MnS as inhibitor,
Subsequently fully separate out in hot rolling and normalizing operation, inhibitor can be met to suppression primary recrystallization
The requirement of normal grain growth.But because slab heating temperature is too high, cause energy waste, set
The standby lost of life, surface defects of products increase, lumber recovery is low, the shortcomings of manufacturing cost increases.
From the point of view of the analysis to documents and materials, Hi-B steel is manufactured using strand low-temperature heat technique
Become the research and development focus of Ge great orientation silicon steel factory of the world.At present, using strand low-temperature heat
Technique, because soaking temperature is relatively low, inhibitor precipitated phase cannot solid solution completely, hot rolled and normal
After change, the intrinsic inhibitor quantity separating out in steel not enough may suppress first crystal grain it is impossible to meet
The requirement normally grown up, that is, have that rejection ability is not enough.Adopt " is obtained more both at home and abroad at present
Type inhibitor method+strand low-temperature heat technique ", obtained new tiny by Nitrizing Treatment
(Al, Si) N or AlN precipitated phase of disperse, to make up the quantitative deficiency of inhibitor.But adopt
Nitrizing Treatment producing Hi-B steel, not only build or transformation decarburization and nitriding production line input very
Greatly, and make production technology become more complicated, decarburization is very tight with the control of nitridation process
Severe.
In orientation silicon steel course of hot rolling, adjust suitable γ phase content (20%～30%), pass through
γ → α phase transition process can make hot rolled plate structure refinement and the thin deformation crystal grain in layered distribution and thin
Little recrystal grain, thus be conducive to forming tying again for the first time of fine uniform after decarburizing annealing
Jingjing grain, promotes secondary recrystallization development.When γ phase<When 20%, easily line crystalline substance, γ phase in finished product
During ＞ 30%, easily small grains in finished product, and this all makes secondary recrystallization imperfection.Further, since
AlN, MnS and Cu2Solubility product difference in α phase and γ phase for the inhibitor such as S is larger.
Particularly in the production process of Hi-B steel, certain γ phase content can ensure that appropriate N is molten
Solution, in γ phase, obtains AlN tiny in a large number, nitrogen is in γ in the rapid cooling of subsequent normalizing process
Big 10 times in α phase about of solid solubility ratio in phase.Analyzed based on above, the present invention passes through Hi-B
Composition of steel designs, control γ phase content in steel it is proposed that a kind of by " intrinsic inhibitor method+
The Hi-B steel that strand low-temperature heat " technique manufactures, by up till now, yet there are no document report.
Content of the invention
It is an object of the invention to overcoming the traditional strand low-temperature heat technique of existing employing, analyse in steel
The hypodynamic problem of intrinsic inhibitor going out is it is impossible to produce Hi-B steel；Meanwhile, overcome using obtaining
Obtain the problems such as inhibitor method production technology is more complicated, control is harsh, a kind of employing inherently is provided
Inhibitor method and the Hi-B steel of strand low-temperature heat technique manufacture, are preferentially designed by composition, press down
γ phase content in the reasonable combination of preparation and control steel, obtains a kind of fine magnetic property
Hi-B steel.
To achieve these goals, the invention provides following technical scheme：
The present invention provide a kind of using intrinsic inhibitor method and strand low-temperature heat technique productions
Hi-B steel, the chemical composition of described Hi-B steel strand is expressed as by mass percentage：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；
Described Hi-B steel adopts sulfide as auxiliary inhibitor, and adopts strand low-temperature heat work
Prepared by skill；
In the standby hot-rolled step of this Hi-B steel, γ phase content is controlled to be 20%～30%.
In described Hi-B steel between γ phase content and C, Si, Mn constituent content and hot-rolled temperature T
Relation as follows：
Described sulfide is MnS and Cu2S.
Described Hi-B steel adopts following processing step preparation：Converter smelting → RH refine → continuous casting →
Heating of plate blank → hot rolling → normalizing → cold rolling → decarburizing annealing → high annealing.
The B of described Hi-B steel8Value is up to 1.988T, P17/50As little as 0.836W/kg.
Compared with prior art, the beneficial effects of the present invention is：
(1) present invention have adjusted Hi-B steel Si, Mn constituent content suitably to increase the number of γ phase
Amount, decreases the Equilibrium Precipitation amount of equal thermal process AlN, has during increased hot rolling and normalizing
The amount of precipitation of effect AlN, improves the rejection ability that in steel, main inhibitor AlN grows up to first crystal grain.
(2) present invention especially increased the content of C, and C is austenite stabilizer element, C unit
The increase of cellulose content, will reduce A3 temperature, lift A4 temperature, and then can expand γ phase region
Scope.Adjust suitable γ phase content (20%～30%), can by γ → α phase transition process
Make hot rolled plate structure refinement the thin deformation crystal grain in layered distribution and tiny recrystal grain,
Promote secondary recrystallization development.
(3) present invention compared with prior art, not only adopts low-temperature heat, Er Qiegong to strand
Skill subject range is wide in range, and rejection ability is sufficient, the Hi-B steel being obtained using the present invention, wherein
B8Value is up to 1.988T, P17/50As little as 0.836W/kg.
Specific embodiment
With reference to embodiment, the present invention is further described.
The present invention provide a kind of using intrinsic inhibitor method and strand low-temperature heat technique productions
Hi-B steel, described Hi-B steel chemical composition is expressed as by mass percentage：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 is typically adopted in described Hi-B steel2S) as auxiliary inhibitor；
Wherein, MnS is that conventional high-temperature flow process produces the auxiliary inhibitor adopting in Hi-B steel, and Mn contains
Amount general control is 0.08～0.60%；Cu2S is conventional in low-temperature heat technique productions Hi-B steel
Auxiliary inhibitor, add appropriate Cu content (0.10～1.0%) in steel, not only can be with S
Combine to form Cu2S improves rejection ability, may also operate as increasing the effect of γ phase amount in steel,
Thus improving solid solubility in steel for the AlN.
Control γ phase content in described Hi-B steel, γ phase content and C, Si, Mn constituent content and
Relation between temperature T is as follows：
Described Hi-B steel adopts following processing step preparation：Converter smelting → RH refine → continuous casting →
Heating of plate blank → hot rolling → normalizing → cold rolling → decarburizing annealing → high annealing.
Described Hi-B steel adopts converter smelting, and the operation of full molten iron or ferroalloy used are without being mingled with
And as the non-ferrous metal such as lead, Tapping Temperature of Bof controls at 1660～1680 DEG C.
Using the fine setting of alloy twice, the amount of leakage of vacuum pump system in RH refining process<25Kg,
Vacuum≤266Pa.RH processes molten steel started temperature and controls at 1600～1680 DEG C, processes eventually
Point temperature control is at 1500～1580 DEG C.
In casting process, middle bag refractory material, crystallizer submersed nozzle etc. adopts carbon-free fire resisting
Material；
Long nozzle adopts blowing argon；
Normal casting 4～5 minutes, 20 minutes, 35 minutes, carries out thermometric respectively；
Thermocouple insertion depth is 145～160mm it is necessary in the middle of insertion, temperature measuring head is away from surrounding wall
Should >=250mm；
Open and must wear long nozzle when pouring and carry out long nozzle blowing argon casting, Argon pressure：
0.10～0.25Mpa.
Continuous casting finishes, and bag in forbidding big Baogang slag to enter (connects when pouring three tanks, middle Bao Yaojin every time
Deslagging of row) closing slide plate will slowly, and molten steel cutout stops immediately it is impossible to whole close,
Casting speed 0.5～4.0m/min.
Steel pouring process must keep mold liquid level to balance, and tundish, crystallizer are all using special guarantor
Shield slag, and adopt electromagnetic agitation, stirring parameter：760～785A/15～18Hz/5s-0-5s.
Heating of plate blank will ensure soaking, makes the abundant solid solution of inhibitor, simultaneously will not strand edge crack.
Heating strand：1150～1200 DEG C of heating-up temperature, heat time heating time 0.1～4.5h, time inside furnace 0.1～5h；
The start rolling temperature of hot rolling controls at 1150～1180 DEG C, and finishing temperature is about 900～920 DEG C.
Hot rolling plate thickness, 2.0～2.5mm, adopt asymmetrical quick cooling, cooling water after the completion of rolling
Temperature control system, at 30～60 DEG C, is cooled to 560～600 DEG C with the cooling rate of about 25～35 DEG C/s, Ran Houxun
Speed is batched and is put in low-temperature insulation stove.In hot-rolled step, γ phase content is controlled to be 20%～30%.
Using two-part normalizing, first paragraph, quickly heat up to 850～1150 DEG C under nitrogen atmosphere simultaneously
Insulation 10～300s, steel plate is heated to 600～900 DEG C by second segment, is incubated 10～300s, and adopts
With Water Quenching, water quenching time 1～90s.
Cold rolling employing timeliness rolling mill practice once cold rolling is to product specific thickness.
After once cold rolling, cold-reduced sheet is in 5～30%H2+ 95～70%N2Dew point is 10～60 DEG C of atmosphere
Under carry out 750～850 DEG C × 0.5～5min decarburizing annealing, now carbon content is down to 0.002～0.004%
Hereinafter, coating post-drying carry out high annealing.
High annealing is it is characterised in that atmosphere used is 20～80%H2+ 80～20%N2, heat up speed
Rate is 10～40 DEG C/h, and temperature is increased to 1100～1250 DEG C, is incubated in pure hydrogen atmosphere
10～30h.Cool down coating stress coat of coming out of the stove and obtain finished product.
In described Hi-B steel, C element content is 0.04～0.065%, and C content is too high, will bring
Decarburization is difficult, and makes the unfavorable factor such as sulfide solid solubility temperature raising in steel.C element is in Hi-B
There is in steel important function, improving C content can make γ phase in steel increase, on the one hand can be
Course of hot rolling makes hot rolled plate structure refinement by γ → α phase transition process and forms the tiny of layered distribution
Deformation crystal grain and recrystal grain, so that first uniform small grains；On the other hand can be
Separate out tiny AlN particle in a large number during normalizing process rapid cooling, increase the suppression that first crystal grain is grown up
Ability.In addition in steel solid solution C atom can also in the cold rolling timeliness operation of rolling pinning dislocation,
Dislocation density is substantially increased, processing hardening faster, recrystallizes raw nuclear location and increases during annealing,
First uniform small grains, promote secondary recrystallization development.
In described Hi-B steel, Si constituent content is 3.1～3.3%.Si element is in orientation silicon steel
Essential element, Si can play and significantly improve resistivity, reduce eddy-current loss, reduce the work of iron loss
With often increasing 0.1%Si, iron loss P can be made17/50Reduce 0.019W/kg.But Si too high levels,
Materials processing is (mainly cold rolling) difficult, and hot rolled plate tissue is thick, makes the inhibitor of precipitation thick
Greatly, quantity reduces, and rejection ability substantially reduces, and secondary recrystallization is difficult, is unsuitable for industrial life
Produce.
In described Hi-B steel, P element content is 0.01～0.03%.When there is a small amount of P in steel
When element is along Grain Boundary Segregation, the particle of the inhibitor precipitation of precipitation is tiny and is more evenly distributed, suppression
Ability processed is strengthened, and P improves resistivity, and finished product magnetic property is good and stable, P17/50?
Decline.
In described Hi-B steel, Als content is 0.025～0.055%, and controls N content in steel
0.007～0.013%.Als content is the most obvious to effect of magnetic influence, Als too high levels, heating strand
Temperature raises, and glass film quality degenerates, and Als content is too low, the AlN separating out in steel very little,
Restraint is not enough, secondary recrystallization imperfection.
Embodiment 1
Embodiment 1 with composition in table 1 as raw material, using converter smelting, Tapping Temperature of Bof
1650℃.
RH refine is using the fine setting of alloy twice, the amount of leakage of vacuum pump system<25Kg, vacuum
≤266Pa.RH processes 1635 DEG C of molten steel started temperature, processes 1565 DEG C of outlet temperature.
In casting process, middle bag refractory material, crystallizer submersed nozzle etc. adopts carbon-free fire resisting
Material.Long nozzle adopts blowing argon, normally casts 4～5 minutes, 20 minutes, 35 minutes,
Carry out thermometric respectively, thermocouple insertion depth be 145mm it is necessary to insertion in the middle of, temperature measuring head away from
Surrounding wall answers >=250mm.Open and must wear long nozzle when pouring and carry out long nozzle blowing argon casting,
Argon pressure：0.15Mpa.Continuous casting finishes, and bag in forbidding big Baogang slag to enter (connects every time and pours the
During three tanks, middle bag will carry out a deslagging) closing slide plate will slowly, and molten steel cutout stops immediately,
Can not whole close, casting speed 0.6m/min.Steel pouring process must keep mold liquid level to put down
Weighing apparatus, tundish, crystallizer are all using mould flux, and adopt electromagnetic agitation, electromagnetic agitation
Parameter：767A/15Hz/5s-0-5s.
During heating of plate blank, heating of plate blank will ensure soaking, make the abundant solid solution of inhibitor, not simultaneously
Cause strand edge crack, 1200 DEG C of slab heating temperature, time inside furnace 280 minutes.
Hot rolling start rolling temperature controls at 1165 DEG C, and finishing temperature is about 900 DEG C.Hot rolling plate thickness
2.0mm, adopts asymmetrical quick cooling after the completion of rolling, coolant water temperature controls at 40 DEG C,
It is cooled to 560 DEG C with the cooling rate of about 30 DEG C/s, then batch rapidly and put in low-temperature insulation stove.
In hot-rolled step, γ phase content is controlled to be 20%～30%,.
Using two-part normalizing, first paragraph, quickly heat up to 1120 DEG C in a nitrogen atmosphere and protect
Warm 120s, steel plate is heated to 850 DEG C by second segment, is incubated 60s, and adopts Water Quenching, water
Quench 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 to carry out under 40 DEG C of atmosphere
800 DEG C × 5min decarburizing annealing, now carbon content be down to less than 0.004%, coating post-drying is gone forward side by side
Row high annealing.
Atmosphere used by high annealing is 60%H2+ 40%N2, heating rate is 25 DEG C/h, by temperature
It is increased to 1210 DEG C, pure hydrogen atmosphere is incubated 25h.Cool down coating stress coat of coming out of the stove to obtain final product
To finished product.Finished product average magnetic strength value B8For 1.908T, average core loss value P17/50For 1.161W/kg.
Wherein, above-mentioned γ phase content is the area percent of detection after the forged sample preparation of strand, tool
System quadrat method is：Using vacuum induction furnace smelting, strand is reheated to after being air cooled to room temperature
1150 DEG C and be incubated 10min, it is forged into the pole of Φ 20mm, makes after wire cutting
The cylinder sample of Φ 10 × 2mm.Because experiment heating-up temperature is between 900～1300 DEG C, in order to
Prevent sample from causing C content change in high-temperature heating process due to oxidation it is ensured that test is tied
The accuracy of fruit, sample is sealed in silica valve.
Embodiment 2
As shown in table 1, remaining step is same as Example 1 for embodiment 2 composition.
Finished product average magnetic strength value B8For 1.936T, average core loss value P17/50For 1.057W/kg.
Embodiment 3
(1) embodiment 3 composition is as shown in table 1,1660 DEG C of Tapping Temperature of Bof.
(2) RH refine is using the fine setting of alloy twice, the amount of leakage of vacuum pump system<25Kg, very
Reciprocal of duty cycle≤266Pa.RH processes 1640 DEG C of molten steel started temperature, processes 1570 DEG C of outlet temperature.
(3) in casting process, middle bag refractory material, crystallizer submersed nozzle etc. is using no
Carbon refractory.Long nozzle adopts blowing argon, normally casting 4～5 minutes, 20 minutes, 35
Minute, carry out thermometric respectively, thermocouple insertion depth is 145mm it is necessary in the middle of insertion, survey
Warm head answers >=250mm away from surrounding wall.Open and must wear long nozzle when pouring and carry out long nozzle Argon guarantor
Shield casting, Argon pressure：0.15Mpa.Continuous casting finishes, and in forbidding big Baogang slag to enter, bag is (every
When three tanks pours in secondary company, middle bag will carry out a deslagging) closing slide plate will slowly, and molten steel stops
Stop it is impossible to whole close immediately, casting speed 0.6m/min.Steel pouring process must keep tying
Brilliant device level balance, tundish, crystallizer are all using mould flux, and adopt electromagnetic agitation,
Stirring parameter：780A/15Hz/5s-0-5s.
(4) heat soaking to be ensured during heating of plate blank, make the abundant solid solution of inhibitor, simultaneously
Will not strand edge crack.1210 DEG C of slab heating temperature, time inside furnace 290 minutes.
(5) hot rolling start rolling temperature controls at 1180 DEG C, and finishing temperature is about 920 DEG C.Hot rolled plate
Thickness 2.3mm, adopts asymmetrical quick cooling after the completion of rolling, coolant water temperature controls
30 DEG C, it is cooled to 580 DEG C with the cooling rate of about 30 DEG C/s, then batches rapidly and put into low-temperature insulation
In stove.
(6) adopt two-part normalizing, first paragraph, quickly heat up to 1120 DEG C in a nitrogen atmosphere
And it is incubated 150s, steel plate is heated to 900 DEG C by second segment, is incubated 60s, and adopts Water Quenching,
Water quenching time 15s.
(7) adopt timeliness rolling mill practice once cold rolling 0.30mm.
(8) after once cold rolling, cold-reduced sheet is in 30%H2+ 70%N2Dew point is under 45 DEG C of atmosphere
Carry out 835 DEG C × 3min decarburizing annealing, now carbon content is down to less than 0.003%, coating after bake
Dry doubling carries out high annealing.
(9) atmosphere used by high annealing is 70%H2+ 30%N2, heating rate is 30 DEG C/h, will
Temperature is increased to 1210 DEG C, is incubated 30h in pure hydrogen atmosphere.Cool down coating stress coat of coming out of the stove
Obtain finished product.Finished product average magnetic strength value B8For 1.988T, average core loss value P17/50For
0.836W/kg.
Table 1 experiment steel chemical composition (%)
γ phase content and magnetic property in table 2 experiment steel
Claims (5)
1. a kind of Hi-B steel using intrinsic inhibitor method and strand low-temperature heat technique productions, its
It is characterised by：The chemical composition of described Hi-B steel strand is expressed as by mass percentage：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；
Described Hi-B steel adopts sulfide as auxiliary inhibitor, and adopts strand low-temperature heat work
Prepared by skill；
In the standby hot-rolled step of this Hi-B steel, γ phase content is controlled to be 20%～30%.
2. according to claim 1 using intrinsic inhibitor method with strand low-temperature heat technique
Produce Hi-B steel it is characterised in that：γ phase content and C, Si, Mn in described Hi-B steel
Relation between constituent content and hot-rolled temperature T is as follows：
3. according to claim 1 using intrinsic inhibitor method with strand low-temperature heat technique
Produce Hi-B steel it is characterised in that：Described sulfide is MnS and Cu2S.
4. according to claim 1 using intrinsic inhibitor method with strand low-temperature heat technique
Produce Hi-B steel it is characterised in that：Described Hi-B steel adopts following processing step preparation：
Converter smelting → RH refine → continuous casting → heating of plate blank → hot rolling → normalizing → cold rolling → decarburization is moved back
Fire → high annealing.
5. according to claim 1 using intrinsic inhibitor method with strand low-temperature heat technique
Produce Hi-B steel it is characterised in that：The B of described Hi-B steel8Value is up to 1.988T, P17/50
As little as 0.836W/kg.
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| CN114107809A (en) * | 2021-11-12 | 2022-03-01 | 内蒙古科技大学 | Oriented electrical steel with copper precipitation as single inhibitor and production method thereof |
| CN117230290A (en) * | 2023-11-16 | 2023-12-15 | 内蒙古丰洲材料有限公司 | Method for controlling precipitation of low-temperature Hi-B steel inhibitor |
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| CN108165876B (en) * | 2017-12-11 | 2020-09-01 | 鞍钢股份有限公司 | Method for improving surface quality of low-temperature nitriding oriented silicon steel |
| CN113174546A (en) * | 2021-04-15 | 2021-07-27 | 鞍钢股份有限公司 | Method for solving problem of coarse grains of oriented silicon steel hot rolled plate |
| CN113174546B (en) * | 2021-04-15 | 2022-06-14 | 鞍钢股份有限公司 | Method for solving problem of coarse grains of oriented silicon steel hot rolled plate |
| CN113789476A (en) * | 2021-09-15 | 2021-12-14 | 鞍钢股份有限公司 | Low-temperature Hi-B steel and production method capable of enhancing inherent AlN inhibition capacity |
| CN114107809A (en) * | 2021-11-12 | 2022-03-01 | 内蒙古科技大学 | Oriented electrical steel with copper precipitation as single inhibitor and production method thereof |
| CN117230290A (en) * | 2023-11-16 | 2023-12-15 | 内蒙古丰洲材料有限公司 | Method for controlling precipitation of low-temperature Hi-B steel inhibitor |
| CN117230290B (en) * | 2023-11-16 | 2024-02-27 | 内蒙古丰洲材料有限公司 | Method for controlling precipitation of low-temperature Hi-B steel inhibitor |
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Effective date of registration: 20200426 Address after: 100081 Haidian District Institute of South Road, Beijing, No. 76 Patentee after: Zhong Da National Engineering and Research Center of Continuous Casting Technology Co.,Ltd. Address before: 100081 Haidian District Institute of South Road, Beijing, No. 76 Co-patentee before: Zhong Da National Engineering and Research Center of Continuous Casting Technology Co.,Ltd. Patentee before: Central Iron and Steel Research Institute |