CN107457379A - A kind of production method of high-carbon high-alloy bearing steel large round billet - Google Patents
A kind of production method of high-carbon high-alloy bearing steel large round billet Download PDFInfo
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- CN107457379A CN107457379A CN201710618704.9A CN201710618704A CN107457379A CN 107457379 A CN107457379 A CN 107457379A CN 201710618704 A CN201710618704 A CN 201710618704A CN 107457379 A CN107457379 A CN 107457379A
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- 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
- B22D11/16—Controlling or regulating processes or operations
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- 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
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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- 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
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Abstract
The present invention provides a kind of production method of high-carbon high-alloy bearing steel large round billet, and it includes：Using electric furnace slag free tapping, ladle refining furnace refines quick deoxidation slag making after tapping, by Fruit storage and it is broken it is empty after soft blow, obtain the molten steel of field trash and the relatively low high-cleanness, high of gas content；Obtained molten steel is poured into the tundish by blowing argon, alkaline low-carbon coverture is added above the liquid steel level in tundish；By monoblock type soaking water gap, by the molten steel injection crystallizer in the tundish, using M-EMS, crystallizer protecting residue is added, every 8~10 stove becomes a slag line, forms the continuous casting green shell containing molten steel in tundish；The intensity of secondary cooling of continuous casting green shell is controlled, the molten steel in the tundish is cooled down using air water atomization cooling, obtained preliminary continuous casting round bloom by the type of cooling of secondary cooling zone；The preliminary continuous casting round bloom is aligned using the method for multiple spot continuous straightening, obtains continuous casting round bloom.
Description
Technical field
The present invention relates to the technical field of Ferrous Metallurgy, more particularly to a kind of production of high-carbon high-alloy bearing steel large round billet
Method.
Background technology
Bearing steel is that a kind of alloy content is higher, has superperformance, most widely used special type steel, is commonly used to manufacture
Ball, roller and bearing ring.
At present, have much on the patent document and technical literature that produce bearing steel continuous cast round billets, disclose a variety of productions
The production technology of bearing steel continuous cast round billets.But for big cross section bearing steel continuous cast round billets, often due to Molten Steel Cleanliness
Difference, the factor such as intensity of cooling and uniformity are unreasonable, technological parameter is improper, easily cause that field trash, gas content be high, composition
The problems such as internal soundness defects such as lack of homogeneity, middle crack, centre burst, central pipe, center segregation with tissue, it is difficult to
Meet the performance requirement of product.
Diameter with the continuous cast round billets section of the steel grade constantly increases, as shown in Fig. 2 production process and quality control are difficult
Degree also increases therewith, continuous casting billet nose problem occurs, steel slow cooling is improper causes strand transverse breakage problem.
The content of the invention
It is an object of the present invention to solve above mentioned problem to be present to the production method of existing bearing steel large round billet, this
Invention provides a kind of production method of high-carbon high-alloy bearing steel large round billet, and methods described is used for stability contorting and improves high-carbon
High alloy bearing steel large round billet quality, this method provide high-cleanness, high molten steel by making steel, and continuous casting passes through setting and optimize technique
Parameter, round billet internal soundness problem is eliminated, solve the problems, such as nose by adjusting base head technique parameter, follow-up strand solves by annealing
Certainly transverse breakage problem.
The production method of the high-carbon high-alloy bearing steel large round billet specifically includes：
Step 1) uses electric furnace slag free tapping, the quick deoxidation slag making of ladle refining after tapping, then Fruit storage 25-
30min, break it is empty after soft blow 15-30min, obtain the molten steel of field trash and the relatively low high-cleanness, high of gas content；
Connected between step 2) ladle and tundish using big bag long nozzle, the seam of big bag long nozzle and steel ladle sliding water gap
Argon gas is passed through at gap, the high-cleanness, high molten steel obtained in step 1) is poured into the tundish, the stream of argon gas by blowing argon
Amount control is in 4~6Nm3/ h, adds alkaline low-carbon coverture above the liquid steel level in tundish, and its basicity is 1.85~
1.95, the degree of superheat for controlling the molten steel in tundish is 15~30 DEG C；By controlling low overheat, stable pulling rate, rational ratio
Water, to avoid causing the molten steel solidification time to be grown because the cast degree of superheat is high, solute and impurity element have time enough from gold
Belong in liquid and separate out, spread and assemble, in turn result in serious gross segregation.The molten steel solidification inside continuous casting round bloom is realized simultaneously
The radial direction of process improves from feeding and even eliminates continuous casting round bloom internal shrinkage rarefaction defect.Current stabilization is set in the tundish
Device and dam, molten steel is obtained steady flow condition in the tundish, and purify molten steel.
Step 3) is when the capacity of the molten steel in the tundish reaches 10-20%, by monoblock type soaking water gap, by institute
State in the molten steel injection crystallizer in tundish, using M-EMS, control crystallizer soaking water gap insertion molten steel liquid
The depth in face is in 90-130mm, and according to rhythm of production, every 8~10 stove becomes a slag line, adds the special crystallizer protection of bearing
Slag, form the continuous casting green shell containing molten steel in tundish；By the electromagnetic agitating technology of crystallizer, dendrite is smashed, accelerates post
Shape crystal orientation equiax crystal is excessive, expands isometric crystalline region, disperses the solute element aggregation of solidification two-phase section, reduces center segregation, improves solidifying
Gu tissue, mitigate loose.Controlled by solidification end slighter compress, the continuous casting green shell deformation is compensated two-phase section solidification shrinkage
Amount, reach the division center densification of continuous casting green shell, to eliminate central pipe, loose and segregation effect；In addition, poured using protection
Note, prevents secondary oxidation of steel, avoids the mass defect inside continuous casting round bloom shell.
In step 4) casting process, using constant pulling rate and constant level control, controlled automatically using mold liquid level
System processed, logic approach for mold level control 170mm, it is allowed to fluctuate the 1mm that fluctuates；Wherein, the continuous casting billet of different-diameter, it is desirable to
Pulling rate is different, and the casting speed control of the continuous casting billet of 500mm diameters is 0.33m/min, the pulling rate control of the continuous casting billet of 650mm diameters
It is made as 0.24m/min, the casting speed control of the continuous casting billet of 700mm diameters is 0.20m/min, the pulling rate of the continuous casting billet of 800mm diameters
Control as 0.18m/min.
In step 5) casting process, the intensity of secondary cooling of continuous casting green shell is controlled, the type of cooling of secondary cooling zone uses air water
Atomization cooling, corresponding specific water's control is 0.07~0.14L/kg, and the molten steel in the tundish is cooled down, and is frozen into solid
Body, obtain preliminary continuous casting round bloom；Electromagnetic agitation is used to the solidification end of preliminary continuous casting round bloom, passes through electromagnetic agitation
Technology, dendrite is smashed, accelerate column crystal orientation equiax crystal excessive, expand isometric crystalline region；
In step 6) casting process, the preliminary continuous casting round bloom is rectified using the method for multiple spot continuous straightening
Directly, continuous casting round bloom is obtained by reasonably adjusting the pulling rate of continuous casting round bloom so that the aligning of the continuous casting round bloom is most
Carried out in good moulding area, by the method for multiple spot continuous straightening, reasonably distribute the pressure of each withdrawal straightening machine so that continuous casting round bloom
Fully aligned.
The production method of the high-carbon high-alloy bearing steel large round billet is used for the bearing steel for producing a diameter of 500~800mm
Continuous casting round bloom.
The production method of the high-carbon high-alloy bearing steel large round billet also includes：
After step 7) the continuous casting round bloom cutting, the continuous casting round bloom after cutting needs to be made annealing treatment.Move back
The cycle of fire processing is at least 3 days, and heating rate is 30 DEG C/h, when being warming up to 810 DEG C, carries out insulation 16 hours, cooling speed
20 DEG C/h of rate, by the method for annealing, the transverse breakage problem of big cross section Continuous Casting Bloom of Bearing Steel can be efficiently solved.
In the step 1), go to be mingled with by Fruit storage and the further degassing of soft blow, obtain high-cleanness, high molten steel,
Including：[O] ＜ 6ppm, [H] ＜ 1.0ppm, [N] ＜ 70ppm, [P] ＜ 130ppm, [S] ＜ 50ppm, [Al] s ＜
120ppm, [As+Sn+Sb+Pb+Bi] ＜ 450ppm.
In the step 2), the tundish includes：5 stopper rod type mouths of a river.Flow straightener and gear are set in the tundish
Dam, steady flow condition is obtained for the molten steel in the tundish, and purify molten steel.
In the step 2), before ladle is continuously injected into molten steel to tundish, blowing argon gas into tundish in advance.
In the step 3), the basicity of crystallizer protecting residue is 0.65~0.73, and the fusion temperature of crystallizer protecting residue is
1200 DEG C~1250 DEG C, the viscosity of crystallizer protecting residue is 0.9PaS~1.1PaS, the burn-off rate of crystallizer protecting residue
50-52s/1350 DEG C, i.e., at 1350 DEG C, the time required for the fusing of the covering slag of crystallizer is 50-52s.
In step 3), to mitigate high alloy continuous casting billet nose problem, the cast of the step 3) starts within rear 10min,
Pulling rate increases 0.02m/min, and sufficient roller and movable water are minimized being worth, i.e., generally 5L/min, not directly closed, otherwise high temperature
To device damage；The pressure value of the withdrawal straightening machine on the base head of continuous casting round bloom point is transferred to the maximum of permission；It is for example, maximum
Pressure value is 50Mpa；High pulling rate, low water distribution, the side for increasing withdrawal straightening machine pressure are taken by the base head point to continuous casting round bloom
Method, can effectively solve the problems, such as the nose of high alloy continuous casting billet.
In the step 4), in casting process, the current control of M-EMS is in 200A~300A；Crystallizer electricity
The FREQUENCY CONTROL of magnetic stirring is in 1.0Hz~1.5Hz；The electric current control of the solidification end electromagnetic agitation of the preliminary continuous casting round bloom
System is in 350A~500A；The FREQUENCY CONTROL of the solidification end electromagnetic agitation of the preliminary continuous casting round bloom is in 6Hz~8Hz.
In the step 5), in casting process, in the end of secondary cooling zone to protective cover is set between withdrawal straightening machine, with right
Round billet is incubated, so as to prevent the generation of round billet straightening cracks.
In step 6), the specific mistake aligned using the method for multiple spot continuous straightening to the preliminary continuous casting round bloom
Journey is as follows：
Withdrawal straightening machine of the arc radius for 16.5m is quarreled if using, wherein, a part of withdrawal straightening machine is the arc of large round billet
Aligning, withdrawal straightening machine described in another part are aligned for the base head part of horizontal of large round billet, and aligning strain rate is controlled below 0.20%,
The pressure of last two framves withdrawal straightening machine in described another part is set as same value.
The step 1) is used for controlling the cleanliness factor of molten steel in smelting process, and the field trash that molten steel includes, it is mainly
O, the field trash that the element such as H, N, P, S and five-harmful elementses As, Sn, Sb, Pb, Bi are formed in process of setting, easily induces grand
See segregation, shrinkage cavity and loose generation.Therefore, in application claims steel-making smelting process, electric furnace, refining furnace, VD stove hands are passed through
Section control and raising Cleanliness of Molten Steel.
The advantage of the invention is that：The method of the present invention can obtain high-cleanness, high by setting and Optimizing Process Parameters
Molten steel, while the secondary oxidation of molten steel is avoided, the shortcomings that overcoming Bearing Steel height, be not easy to align, solve high alloy
The nose and transverse breakage problem of steel bearing steel, it ensure that product quality, simple production process, recovery rate height.The axle produced
Holding steel has the characteristics of structural homogenity is good, and comprehensive mechanical property is excellent.In addition, alkaline covering agent is advantageous to the folder that absorption is floated
Debris；In addition, the problem of present invention can be very good to overcome Inclusion in Bearing Steel and high gas content；It can solve the problem that high-carbon is high to close
Golden bearing steel hardness in straightening process is high, is not easy the difficulty aligned；It can solve the problem that the nose problem of high-carbon high-alloy bearing base；
It can solve the problem that the transverse breakage problem of high-carbon high-alloy bearing base；The internal soundness of strand can also be ensured.
Brief description of the drawings
Fig. 1 is a kind of center cross section of 800mmGCr15SiMn of present invention high-carbon high-alloy bearing steel large round billet
Acidleach low power figure；
Fig. 2 is a kind of base head nose of 800mmGCr15SiMn of prior art high-carbon high-alloy bearing steel large round billet
Figure, it can be seen that GCr15SiMn steel noses are serious；
Fig. 3 is the base head nose using a kind of 800mmGCr15SiMn of present invention high-carbon high-alloy bearing steel large round billet
Figure, it can be seen that GCr15SiMn steel is without obvious nose.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The invention provides a kind of production method of high-carbon high-alloy bearing steel large round billet, in the present embodiment, using root
According to methods described, using the continuous casting round bloom of a diameter of 800mmGCr15SiMn steel of full arc radius 16.5m conticasters production, institute
State method to be used for stability contorting and improve high-carbon high-alloy bearing steel large round billet quality, this method provides high-cleanness, high by making steel
Molten steel, continuous casting are eliminated round billet internal soundness problem, solved by adjusting base head technique parameter by setting and Optimizing Process Parameters
Nose problem, follow-up strand solve the problems, such as transverse breakage by annealing.
As shown in figure 1, the production method of the high-carbon high-alloy bearing steel large round billet specifically includes：
Step 1) uses electric furnace slag free tapping, and ladle refining furnace refines quick deoxidation slag making, Fruit storage after tapping
27min, break it is empty after soft blow 20min, obtain the molten steel of field trash and the relatively low high-cleanness, high of gas content；
Connected between step 2) ladle and tundish using big bag long nozzle, the seam of big bag long nozzle and steel ladle sliding water gap
Argon gas is passed through at gap, the high-cleanness, high molten steel obtained in step 1) is poured into the tundish, the stream of argon gas by blowing argon
Amount control is in 6Nm3/ h, alkaline low-carbon coverture is added above the liquid steel level in tundish, its basicity is 1.90, among control
The degree of superheat of molten steel in bag is 25 DEG C；By controlling low overheat, stable pulling rate, rational specific water, to avoid because of cast
The degree of superheat is high and causes the molten steel solidification time to be grown, solute and impurity element there is time enough to separate out, spread from molten metal and
Aggregation, in turn results in serious gross segregation.The radial direction of molten steel solidification process inside continuous casting round bloom is realized simultaneously from feeding,
Improve and even eliminate continuous casting round bloom internal shrinkage rarefaction defect.
Step 3) is when the capacity of the molten steel in the tundish reaches 10-20%, by monoblock type soaking water gap, by institute
State in the molten steel injection crystallizer in tundish, using M-EMS, control crystallizer soaking water gap insertion molten steel liquid
The depth in face is in 110mm, and according to rhythm of production, every 8 stove becomes a slag line, above carries 10mm slag lines every time, and it is special to add bearing
Crystallizer protecting residue, form the continuous casting green shell containing molten steel in tundish；By the electromagnetic agitating technology of crystallizer, branch is smashed
Crystalline substance, accelerate column crystal orientation equiax crystal excessive, expand isometric crystalline region, disperse the solute element aggregation of solidification two-phase section, it is inclined to reduce center
Analysis, improve solidified structure, mitigate loose.Controlled by solidification end slighter compress, the continuous casting green shell deformation is compensated two-phase
Area's solidification shrinkage amount, reach the division center densification of continuous casting green shell, to eliminate central pipe, loose and segregation effect；In addition,
Using molding casting, secondary oxidation of steel is prevented, avoids the mass defect inside continuous casting round bloom shell.
In step 4) casting process, using constant pulling rate and constant level control, a diameter of 800mm continuous casting billet
Casting speed control is 0.18m/min, using mold liquid level automatic control system, logic approach for mold level control 170mm, it is allowed to fluctuate
Fluctuate 1mm；Wherein, the continuous casting green shell of different-diameter, it is desirable to pulling rate be different.
In step 5) casting process, the intensity of secondary cooling of continuous casting green shell is controlled, the type of cooling of secondary cooling zone uses air water
Atomization cooling, corresponding specific water's control is 0.097L/kg, and the molten steel in the tundish is cooled down, solid is frozen into, obtains
Preliminary continuous casting round bloom；Electromagnetic agitation is used to the solidification end of preliminary continuous casting round bloom, by electromagnetic agitating technology, beaten
Broken dendrite, accelerate column crystal orientation equiax crystal excessive, expand isometric crystalline region.
In step 6) casting process, the preliminary continuous casting round bloom is rectified using the method for multiple spot continuous straightening
Directly, continuous casting round bloom is obtained.By the pulling rate for reasonably adjusting continuous casting round bloom so that the aligning of the continuous casting round bloom is most
Carried out in good moulding area, by the method for multiple spot continuous straightening, reasonably distribute the pressure of each withdrawal straightening machine so that continuous casting round bloom
Fully aligned.
Wherein, the pressure setting of withdrawal straightening machine, it is as shown in the table：
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Base head point/Mpa | 20 | 24 | 26 | 30 | 34 | 40 | 40 | 50 | 50 |
| Normal strand/Mpa | 8 | 10 | 12 | 14 | 16 | 20 | 22 | 25 | 25 |
Wherein, the design of pressure of last two framves withdrawal straightening machine is same value, i.e. 25Mpa.
The present embodiment obtains diameter 800mm GCr15SiMn steel continuous casting round bloom, and the glacing flatness of continuous casting round bloom is good.It is low
Organize again as shown in Figure 1, it can be seen that the internal soundness of continuous casting round bloom is preferable, and macrostructure defect presses YB/T4149 appendix As
Judge picture is evaluated, center porosity≤1.0 grade, shrinkage cavity≤0.5 grade, without centre burst and middle crack.Sent out by being contrasted with Fig. 2
Existing, base head point is as shown in Figure 3, it can be seen that strand is without obvious nose.
The production method of the high-carbon high-alloy bearing steel large round billet is used for the bearing steel for producing a diameter of 500~800mm
Continuous casting round bloom.
The production method of the high-carbon high-alloy bearing steel large round billet also includes：
After step 7) the continuous casting round bloom cutting, the continuous casting round bloom after cutting needs to be made annealing treatment.Move back
The cycle of fire processing is 3 days, and heating rate is 30 DEG C/h, when being warming up to 810 DEG C, carries out insulation 16 hours, rate of temperature fall 20
DEG C/h, by the method for annealing, the transverse breakage problem of big cross section Continuous Casting Bloom of Bearing Steel can be efficiently solved.
In the step 1), go to be mingled with by Fruit storage and the further degassing of soft blow, obtain high-cleanness, high molten steel,
Including：[O] ＜ 6ppm, [H] ＜ 1.0ppm, [N] ＜ 70ppm, [P] ＜ 130ppm, [S] ＜ 50ppm, [Al] s ＜
120ppm, [As+Sn+Sb+Pb+Bi] ＜ 450ppm.
In the step 2), the tundish includes：5 stopper rod type mouths of a river.Flow straightener and gear are set in the tundish
Dam, steady flow condition is obtained for the molten steel in the tundish, and purify molten steel.
In the step 2), before ladle is continuously injected into molten steel to tundish, blowing argon gas into tundish in advance.
In the step 3), the basicity of crystallizer protecting residue is 0.73, and the fusion temperature of crystallizer protecting residue is 1253 DEG C,
The viscosity of crystallizer protecting residue is 1.088PaS, 52s/1350 DEG C of the burn-off rate of crystallizer protecting residue, i.e., in 1350 DEG C of feelings
Under condition, the time required for the fusing of crystallizer protecting residue is 52s.
In step 3), to mitigate high alloy continuous casting billet nose problem, the cast of the step 3) starts within rear 10min,
Pulling rate increases 0.020m/min, and sufficient roller and movable water are minimized being worth, i.e., generally 5L/min, not directly closed, otherwise high
Temperature is to device damage；The pressure value of the withdrawal straightening machine on the base head of continuous casting round bloom point is transferred to the maximum of permission；800mm is straight
The maximum pressure value of the large round billet in footpath is 50Mpa；After 10min is poured into a mould, casting speed control is corresponding to compare water in 0.18m/min
Measure as 0.097L/kg；High pulling rate, low water distribution, the side for increasing withdrawal straightening machine pressure are taken by the base head point to continuous casting round bloom
Method, can effectively solve the problems, such as the nose of high alloy continuous casting billet.
In the step 4), in casting process, the current control of M-EMS is in 260A；M-EMS
FREQUENCY CONTROL in 1.0Hz；The current control of the solidification end electromagnetic agitation of the preliminary continuous casting round bloom is in 400A；It is described
The FREQUENCY CONTROL of the solidification end electromagnetic agitation of preliminary continuous casting round bloom is in 7.5Hz.
In the step 5), in casting process, in the end of secondary cooling zone to protective cover is set between withdrawal straightening machine, with right
Round billet is incubated, so as to prevent the generation of round billet straightening cracks.
In step 6), the specific mistake aligned using the method for multiple spot continuous straightening to the preliminary continuous casting round bloom
Journey is as follows：
Withdrawal straightening machine of the 9 frame arc radius for 16.5m is used, wherein, withdrawal straightening machine described in 5 framves is aligned for the arc of large round billet, and 4
Withdrawal straightening machine described in frame is aligned for the base head part of horizontal of large round billet, and below 0.20%, 4 frame is horizontal for aligning strain rate control
The pressure of withdrawal straightening machine is set as same value described in last 2 frame in withdrawal straightening machine.
The step 1) is used for controlling the cleanliness factor of molten steel in smelting process, and the field trash that molten steel includes, it is mainly
O, the field trash that the element such as H, N, P, S and five-harmful elementses As, Sn, Sb, Pb, Bi are formed in process of setting, easily induces grand
See segregation, shrinkage cavity and loose generation.Therefore, in application claims steel-making smelting process, electric furnace, refining furnace, VD stove hands are passed through
Section control and raising Cleanliness of Molten Steel.
The firm bearing steel of high-carbon high-alloy in the production high-carbon high-alloy bearing steel large round billet pointed out in the present invention, Ke Yishi
C：0.95-1.05%, Si：0.15-0.75%, Mn：0.25-1.25%, P≤0.015%, S≤0.015%,
Cr：1.4-1.65%, Ni≤0.30%, Mo≤0.10%, Cu≤0.25%, Al≤0.02%-0.03.
It should be noted last that the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although ginseng
The present invention is described in detail according to embodiment, it will be understood by those within the art that, to the technical side of the present invention
Case is modified or equivalent substitution, and without departure from the spirit and scope of technical solution of the present invention, it all should cover in the present invention
Right among.
Claims (10)
1. a kind of production method of high-carbon high-alloy bearing steel large round billet, comprises the following steps：
Step 1) uses electric furnace slag free tapping, ladle refining furnace refinement and deoxidation slag making after tapping, then Fruit storage 25-
30min, break it is empty after soft blow 15-30min, obtain the molten steel of field trash and the relatively low high-cleanness, high of gas content；
The high-cleanness, high molten steel obtained in step 1) is poured into the tundish by step 2) by blowing argon, the steel in tundish
Alkaline low-carbon coverture is added above water level, its basicity is 1.85~1.95, and the degree of superheat for controlling the molten steel in tundish is
15~30 DEG C；
Step 3) is when the capacity of the molten steel in the tundish reaches 10-20%, by monoblock type soaking water gap, in described
Between in molten steel injection crystallizer in bag, using M-EMS, control crystallizer soaking water gap insertion liquid steel level
Depth adds crystallizer protecting residue in 90-130mm, and every 8~10 stove becomes a slag line, is formed in tundish and contains molten steel
Continuous casting green shell；
In step 4) casting process, using constant pulling rate and constant level control, automatically controlled using mold liquid level and be
System, logic approach for mold level control 170mm；
In step 5) casting process, the intensity of secondary cooling of continuous casting green shell is controlled, the molten steel in the tundish is cooled down, is obtained preliminary
Continuous casting round bloom；
In step 6) casting process, the preliminary continuous casting round bloom is aligned using the method for multiple spot continuous straightening, obtained
To continuous casting round bloom.
2. the production method of high-carbon high-alloy bearing steel large round billet according to claim 1, it is characterised in that using air water
The mode of cooling is atomized, the molten steel in the tundish is cooled down.
3. the production method of high-carbon high-alloy bearing steel large round billet according to claim 1, it is characterised in that the high-carbon
The production method of high alloy bearing steel large round billet also includes：
After step 7) is by continuous casting round bloom cutting obtained by step 6), the continuous casting round bloom after cutting needs to carry out at annealing
Reason.
4. the production method of high-carbon high-alloy bearing steel large round billet according to claim 1, it is characterised in that the step
1) in, go to be mingled with by Fruit storage and the further degassing of soft blow, obtain high-cleanness, high molten steel, wherein, the high-cleanness
Degree molten steel includes：[O] ＜ 6ppm, [H] ＜ 1.0ppm, [N] ＜ 70ppm, [P] ＜ 130ppm, [S] ＜ 50ppm, [Al] s ＜
120ppm, [As+Sn+Sb+Pb+Bi] ＜ 450ppm.
5. the production method of high-carbon high-alloy bearing steel large round billet according to claim 1, it is characterised in that the step
2) in, flow straightener and dam are set in the tundish.
6. the production method of high-carbon high-alloy bearing steel large round billet according to claim 1, it is characterised in that the step
3) in, the basicity of crystallizer protecting residue is 0.65~0.73, and the fusion temperature of crystallizer protecting residue is 1200 DEG C~1250 DEG C, knot
The viscosity of brilliant device covering slag is 0.9PaS~1.1PaS, 50-52s/1350 DEG C of the burn-off rate of crystallizer protecting residue.
7. the production method of high-carbon high-alloy bearing steel large round billet according to claim 1, it is characterised in that step 3)
In, the cast of the step 3) starts within rear 10min, and pulling rate increase 0.01-0.02m/min, sufficient roller and movable water drop to 5L/
Min, the pressure value of the withdrawal straightening machine on the base head point of continuous casting round bloom are transferred to 50MPa.
8. the production method of high-carbon high-alloy bearing steel large round billet according to claim 1, it is characterised in that the step
4) in, in casting process, the current control of M-EMS is in 200A~300A；The FREQUENCY CONTROL of M-EMS
In 1.0Hz~1.5Hz；The current control of the solidification end electromagnetic agitation of the preliminary continuous casting round bloom is in 350A~500A；
The FREQUENCY CONTROL of the solidification end electromagnetic agitation of the preliminary continuous casting round bloom is in 6Hz~8Hz.
9. the production method of high-carbon high-alloy bearing steel large round billet according to claim 1, it is characterised in that the step
5) in, in casting process, in the end of secondary cooling zone to setting protective cover between withdrawal straightening machine.
10. the production method of high-carbon high-alloy bearing steel large round billet according to claim 1, it is characterised in that step 6)
In, the detailed process aligned using the method for multiple spot continuous straightening to the preliminary continuous casting round bloom is as follows：
Withdrawal straightening machine of the arc radius for 16.5m is quarreled if using, wherein, a part of withdrawal straightening machine is aligned for the arc of large round billet, separately
A part of withdrawal straightening machine is the horizontal aligning of the base head of large round billet, and aligning strain rate control is below 0.20%.
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| CN108705052A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The continuous casting producing method of bloom pinion steel strand |
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| CN110616296A (en) * | 2019-10-30 | 2019-12-27 | 江阴华润制钢有限公司 | Method for producing high-carbon high-alloy ledeburite steel by arc continuous casting |
| CN113000803A (en) * | 2021-02-24 | 2021-06-22 | 建龙北满特殊钢有限责任公司 | Continuous casting process method for improving internal quality of high-carbon steel bloom |
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