CN110170631A - Improve the control method of pinion steel small billet center segregation - Google Patents
Improve the control method of pinion steel small billet center segregation Download PDFInfo
- Publication number
- CN110170631A CN110170631A CN201910440076.9A CN201910440076A CN110170631A CN 110170631 A CN110170631 A CN 110170631A CN 201910440076 A CN201910440076 A CN 201910440076A CN 110170631 A CN110170631 A CN 110170631A
- Authority
- CN
- China
- Prior art keywords
- target
- control
- casting
- practical
- molten steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- 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
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields
-
- 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
-
- 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
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
-
- 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
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
Abstract
A kind of control method for improving pinion steel small billet center segregation of the present invention, including ladle chemistry Narrow Composition Control, the control of the casting degree of superheat, cast permanent casting speed control and the control of other casting process；The narrow ingredient actual content scope control precision of ladle chemistry are as follows: CIt is practical=CTarget±0.01%；SiIt is practical=SiTarget±0.015%；MnIt is practical=MnTarget±0.03%；CrIt is practical=CrTarget±0.025%；TiIt is practical=TiTarget±0.01%；Tundish degree of superheat stability contorting is within the scope of 20-35 DEG C in casting process；Molten steel is cast when billet caster is cast using permanent pulling rate, guarantees Water Rate for Secondary Cooling Water；Molten steel is when billet caster is cast, and using M-EMS, uses end electromagnetic agitation in continuous casting and solidifying end, uses dynamic soft reduction technology in solidification end.The present invention can make the center segregation of light section pinion steel slab be effectively controlled, and improve the homogeneity of ingredients on pinion steel small billet cross section, promote Inner Quality of Billet.
Description
Technical field
The present invention relates to a kind of control method of center segregation of casting blank more particularly to a kind of improvement pinion steel small billet centers
The control method of segregation.
Background technique
Pinion steel is mainly used for each type gear such as the various differential mechanism principal and subordinate movable tooths of processing and fabricating, star tooth, axle shaft gear and produces
Product.With the development of Domestic Automotive Industry, its quality requirement is continuously improved in important transmission parts of the pinion steel as automobile,
Not only to have good obdurability, wearability, can absorb impact, be bent and contact stress well, but also require to deform it is small,
Precision is high, and especially for narrow hardenability band is protected, low strap shape tissue rank, to homogeneity of ingredients, more stringent requirements are proposed.
The segregation of pinion steel is to cause the internal soundness of steel and the unstable principal element of performance；Improve slab segregation control
Important method be exactly to improve slab consistency and casting blank solidification crystalline structure uniformity.The main original that center segregation of casting blank is formed
Because being in slab cooling process of setting, with growing up for column crystal, solute element is constantly precipitated in interdendritic, leads to the life of dendrite
Long, the molten steel part of high solute concentration is pushed to slab center；In addition, light section slab center solidification shrinkage will lead to it
Molten steel is extracted, is difficult to shrink casting blank solidification to form effective feeding so as to cause top molten steel, the high solute concentration in interdendritic
Molten steel is assembled to slab center, and it is obviously higher to eventually lead to center segregation of casting blank degree.
Summary of the invention
Technical problem to be solved by the invention is to provide it is a kind of improve pinion steel small billet center segregation control method,
The center segregation of light section pinion steel slab can be made to be effectively controlled, the ingredient improved on pinion steel small billet cross section is uniform
Property, promote Inner Quality of Billet.
Solve the technical solution of above-mentioned technical problem are as follows:
Improve the control method of pinion steel small billet center segregation, including ladle chemistry Narrow Composition Control, the casting degree of superheat
Control, cast permanent casting speed control and the control of other casting process；
The ladle chemistry Narrow Composition Control refers to the floating range for reducing pinion steel tie element target content, Ge Gecheng
Divide actual content scope control precision are as follows:
CIt is practical=CTargetC in ± 0.01% formulaIt is practical: the actual content of C；CTarget: the target content of C
SiIt is practical=SiTargetSi in ± 0.015% formulaIt is practical: the actual content of Si；SiTarget: the target content of Si
MnIt is practical=MnTargetMn in ± 0.03% formulaIt is practical: the actual content of Mn；MnTarget: the target content of Mn
CrIt is practical= CrTargetCr in ± 0.025% formulaIt is practical: the actual content of Cr；CrTarget: the target content of Cr
TiIt is practical= TiTargetTi in ± 0.01% formulaIt is practical: the actual content of Ti；TiTarget: the target content of Ti
The casting degree of superheat control refers to that tundish degree of superheat stability contorting is within the scope of 20-35 DEG C in casting process；
The continuous casting perseverance casting speed control refers to that molten steel is cast in billet caster casting using permanent pulling rate, guarantees that two is cold
Specific water；
Other casting process control refers to molten steel in billet caster casting, using M-EMS, even
It casts solidification end and uses end electromagnetic agitation, use dynamic soft reduction technology in solidification end.
The control method of above-mentioned improvement pinion steel small billet center segregation, the ladle chemistry Narrow Composition Control mistake
Cheng Zhong stablizes converter and is packed into system and waste steel quality, reduces tap fluctuation, guarantees tapping terminal C content control in 0.06-
Within the scope of 0.12wt%.
The control method of above-mentioned improvement pinion steel small billet center segregation, the ladle chemistry Narrow Composition Control exist
It is completed in converter steelmaking process, carries out LF refining after the completion of converter smelting, manganese iron, silicon are added when LF refining carries out 15-25min
Iron, ferrochrome are accurately adjusted to target content, and adjust 0.02%~C of C content ﹣ in molten steelTarget。
The control method of above-mentioned improvement pinion steel small billet center segregation, Argon stirs flow control after LF refining 30min
The molten steel refined is hung to RH application of vacuum in 100-300 NL/min by system, is de-gassed and purifies molten steel, soft after RH refining
>=10min is blown the time, guarantees that ladle chemistry is uniform, is segregated caused by reducing due to uneven chemical components.
The control method of above-mentioned improvement pinion steel small billet center segregation, RH carry out molten steel bull ladle after refining, hang
Baogang's coolant-temperature gage controls within the scope of 1570-1585 DEG C, and coverture complete stroke thermal insulating, continuous casting process control are added on Metal in Tundish liquid level
Molten steel temperature drop processed is in the range of 25-40 DEG C.
The control method of above-mentioned improvement pinion steel small billet center segregation, the continuous casting perseverance casting speed control refer to small billet
Dynamic secondary cooling water distribution is used in conticaster casting process, casting pulling rate is constant in 1.1m/min, and Water Rate for Secondary Cooling Water control is made to exist
0.5L/kg。
The control method of above-mentioned improvement pinion steel small billet center segregation in the casting process control process, uses
R10m billet caster is cast, using M-EMS, 350 ± 20A/3.0 of parameter ± 0.5Hz, away from crystallizer
End electromagnetic agitation is set at meniscus 7.2m, and 250 ± 20A/8.0 of parameter ± 0.5Hz uses dynamic soft-reduction in solidification end
Technology.
The control method of above-mentioned improvement pinion steel small billet center segregation, the ladle chemistry Narrow Composition Control mistake
Cheng Zhong stablizes converter and is packed into system and waste steel quality, reduces tap and fluctuates, according to molten steel amount with addition of nitrogen content in tapping process
Low nitrogen carbon dust lower than 120PPM and containing the alloy of Si, Mn, Cr, guarantees tapping terminal C content control in 0.06-0.12wt%
In range.
Core control point of the present invention are as follows: (1) each chemical component of molten steel carries out Narrow Composition Control, reduces to mix between each heat and pours section
Component difference and caused by slab be segregated；(2) refining uses the bis- refinery practices of LF and RH, improves the degree of purity of molten steel, promotes
Ingredient is more uniform, is segregated caused by reducing due to uneven chemical components；(3) continuous casting and solidifying end uses dynamic soft-reduction skill
Art and the double electricity of continuous casting stir technique, and adopt low overheat and permanent pulling rate and be poured, and the convective motion for reinforcing molten steel in wick-containing reduces
Wick-containing temperature gradient, fracture dendrite, accelerates the transition of column crystal orientation equiax crystal, and low overheat casting reduces on casting blank section
Temperature gradient improves equiaxial crystal ratio, and then effectively alleviates dendritic segregation of the slab in process of setting.
The invention has the benefit that
The present invention uses chemical component Narrow Composition Control, reduces the fluctuation range of each chemical component, while reducing and even pouring in process
Lower heat of molten steel chemical component deviation, to be conducive to control the homogeneity of ingredients on pinion steel continuous cast billet cross section.
The present invention effectively controls the center segregation of pinion steel slab, increases the ratio of equiax crystal, low overheat and perseverance
Pulling rate shortens liquid core length and setting time, and technique is stirred using dynamic soft reduction technology and the double electricity of continuous casting in continuous casting and solidifying end,
Reduce element segregation, Inner Quality of Billet obtains effective guarantee.
Specific embodiment
Below in conjunction with specific implementation example, the present invention is described in further detail.
Embodiment 1:
20CrMnTiH pinion steel is produced using R10m arc billet caster, stablizes converter in 120t converter steelmaking process and is packed into
System and waste steel quality reduce tap and fluctuate, and are lower than 0.012wt% with addition of nitrogen content according to 135t molten steel amount in tapping process
Low nitrogen carbon dust and the alloy containing Si, Mn, Cr, tapping terminal C content be 0.06wt%；After the completion of converter smelting, ladle is by turning
Furnace hangs LF refining, and manganese iron, ferrosilicon, ferrochrome are added when refining 15min and accurately adjusts Si, Mn, Cr element and contains to target
Amount, and C content is adjusted in molten steel to 0.17wt%；Turn Argon stirring intensity down after LF refining 40min, stirring flow control exists
The molten steel refined is hung to RH application of vacuum by 100NL/min, is de-gassed and purifies molten steel, after RH refining the soft blow time be
15min guarantees that ladle chemistry is uniform, is segregated caused by reducing due to uneven chemical components；Molten steel after RH is refined
When carrying out bull ladle, 1582 DEG C of bull ladle liquid steel temperature, on Metal in Tundish liquid level plus coverture complete stroke thermal insulating, continuous casting process control steel
Water temperature drops in the range of 25-40 DEG C；Continuous casting billet is having a size of 200 × 200mm；Chemical Composition in Cast Billet weight percent is respectively as follows:
C:0.19%, Si:0.24%, Mn:0.97%, Cr:1.12%, Ti:0.06%, P:0.012%, S:0.007%, Als:0.026%；Each member
The target content value of element is respectively as follows: C:0.19%, Si:0.24%, Mn:0.97%, Cr:1.12%, Ti:0.06%, P :≤0.015%,
S :≤0.008%, Als:0.023%；Meet chemical component Narrow Composition Control requirement；It is 32 DEG C that the practical degree of superheat is wrapped in when casting,
Casting process keeps pulling rate to cast in 1.1m/min perseverance pulling rate, Water Rate for Secondary Cooling Water 0.5L/kg.The stirring of M-EMS
Intensity is 359A, stirring frequency 3.0Hz；The stirring intensity of solidification end electromagnetic agitation is 264.6A, and stirring frequency is
8.3Hz.The press control of 4.8mm is carried out in casting blank solidification end, causes to take out high solute concentration molten steel to weaken central reduction
It inhales.
After casting, low power detection is carried out to pinion steel 20CrMnTiH continuous casting billet, and examine to Inner Quality of Billet
It surveys, testing result shows that center segregation of casting blank is rated 1.0 grades, remaining quality index is all met the requirements.To further clarify
It is inclined to carry out drilling cuttings sampling (chisel bit diameter phi 5mm) to slab using chemical analysis for segregation control situation in slab cross section
Analysis detection, sample position are distributed in each 4 points on slab intrados to center line and center clinodiagonal and are uniformly distributed, additional casting
The point of base center 1, totally 9 points.Testing result show that slab carbon segregation degree is integrally controlled in 0.97-1.08, tracking rolling
Specification 50mm round steel is examined, and round steel center portion segregated zone significantly reduces, and 1.5 grades of banded structure rank, meets the band of user's requirement
The needs of shape tissue rank≤2.5 grade, other performance, which is examined, all meets user's requirement.
Embodiment 2:
20CrMnTiH pinion steel is produced using R10m arc billet caster, stablizes converter in 120t converter steelmaking process and is packed into
System and waste steel quality reduce tap and fluctuate, and are lower than 0.012wt% with addition of nitrogen content according to 135t molten steel amount in tapping process
Low nitrogen carbon dust and the alloy containing Si, Mn, Cr, tapping terminal C content be 0.07wt%；After the completion of converter smelting, ladle is by turning
Furnace hangs LF refining, and manganese iron, ferrosilicon, ferrochrome are added when refining 20min and accurately adjusts Si, Mn, Cr element and contains to target
Amount, and C content is adjusted in molten steel to 0.18wt%；Turn Argon stirring intensity down after LF refining 35min, stirring flow control exists
The molten steel refined is hung to RH application of vacuum by 250NL/min or so, molten steel is de-gassed and purifies, after RH refining when soft blow
Between be 17min, guarantee ladle chemistry it is uniform, reduce due to uneven chemical components caused by be segregated；After RH is refined
When molten steel carries out bull ladle, 1579 DEG C of bull ladle liquid steel temperature, on Metal in Tundish liquid level plus coverture complete stroke thermal insulating, continuous casting process control
Molten steel temperature drop processed is in the range of 25-40 DEG C；Continuous casting billet is having a size of 200 × 200mm；Chemical Composition in Cast Billet weight percent difference
Are as follows: C:0.19%, Si:0.23%, Mn:0.98%, Cr:1.10%, Ti:0.06%, P:0.013%, S:0.004%, Als:0.024%；
The target content value of each element is respectively as follows: C:0.19%, Si:0.24%, Mn:0.97%, Cr:1.12%, Ti:0.06%, P :≤
0.015%, S :≤0.008%, Als:0.023%；Meet chemical component Narrow Composition Control requirement；The practical degree of superheat is wrapped in when casting
It is 29 DEG C, casting process keeps pulling rate to cast in 1.1m/min perseverance pulling rate, Water Rate for Secondary Cooling Water 0.5L/kg.Crystallizer electromagnetism stirs
The stirring intensity mixed is 351.1A, stirring frequency 3.0Hz；The stirring intensity of solidification end electromagnetic agitation is 267.0A, stirring
Frequency is 8.3Hz.The press control of 4.8mm is carried out in casting blank solidification end, is caused with weakening central reduction to high solute concentration
Molten steel suction.
After casting, low power detection is carried out to pinion steel 20CrMnTiH continuous casting billet, and examine to Inner Quality of Billet
It surveys, testing result shows that center segregation of casting blank is rated 0.5 grade, remaining quality index is all met the requirements.To further clarify
It is inclined to carry out drilling cuttings sampling (chisel bit diameter phi 5mm) to slab using chemical analysis for segregation control situation in slab cross section
Analysis detection, sample position are distributed in each 4 points on slab intrados to center line and center clinodiagonal and are uniformly distributed, additional casting
The point of base center 1, totally 9 points.Testing result show that slab carbon segregation degree is integrally controlled in 0.97-1.07, tracking rolling
Specification 60mm round steel is examined, and round steel center portion segregated zone significantly reduces, and 1.0 grades of banded structure rank, meets the band of user's requirement
The needs of shape tissue rank≤2.5 grade, other performance, which is examined, all meets user's requirement.
Embodiment 3:
20CrMnTiH pinion steel is produced using R10m arc billet caster, stablizes converter in 120t converter steelmaking process and is packed into
System and waste steel quality reduce tap and fluctuate, and are lower than 0.012wt% with addition of nitrogen content according to 135t molten steel amount in tapping process
Low nitrogen carbon dust and the alloy containing Si, Mn, Cr, tapping terminal C content be 0.06wt%；After the completion of converter smelting, ladle is by turning
Furnace hangs LF refining, and manganese iron, ferrosilicon, ferrochrome are added when refining 20min and accurately adjusts Si, Mn, Cr element and contains to target
Amount, and C content is adjusted in molten steel to 0.17wt%；Turn Argon stirring intensity down after LF refining 40min, stirring flow control exists
The molten steel refined is hung to RH application of vacuum by 200NL/min or so, molten steel is de-gassed and purifies, after RH refining when soft blow
Between be 19min, guarantee ladle chemistry it is uniform, reduce due to uneven chemical components caused by be segregated；After RH is refined
When molten steel carries out bull ladle, 1575 DEG C of bull ladle liquid steel temperature, on Metal in Tundish liquid level plus coverture complete stroke thermal insulating, continuous casting process control
Molten steel temperature drop processed is in the range of 25-40 DEG C；Continuous casting billet is having a size of 200 × 200mm；Chemical Composition in Cast Billet weight percent difference
Are as follows: C:0.19%, Si:0.24%, Mn:0.97%, Cr:1.12%, Ti:0.06%, P:0.015%, S:0.005%, Als:0.025%；
The target content value of each element is respectively as follows: C:0.19%, Si:0.24%, Mn:0.97%, Cr:1.12%, Ti:0.06%, P :≤
0.015%, S :≤0.008%, Als:0.023%；Meet chemical component Narrow Composition Control requirement；The practical degree of superheat is wrapped in when casting
It is 26 DEG C, casting process keeps pulling rate to cast in 1.1m/min perseverance pulling rate, Water Rate for Secondary Cooling Water 0.5L/kg.Crystallizer electromagnetism stirs
The stirring intensity mixed is 353.9A, stirring frequency 3.0Hz；The stirring intensity of solidification end electromagnetic agitation is 261.6A, stirring
Frequency is 8.2Hz.The press control of 4.8mm is carried out in casting blank solidification end, is caused with weakening central reduction to high solute concentration
Molten steel suction.
After casting, low power detection is carried out to pinion steel 20CrMnTiH continuous casting billet, and examine to Inner Quality of Billet
It surveys, testing result shows that center segregation of casting blank is rated 0.5 grade, remaining quality index is all met the requirements.To further clarify
It is inclined to carry out drilling cuttings sampling (chisel bit diameter phi 5mm) to slab using chemical analysis for segregation control situation in slab cross section
Analysis detection, sample position are distributed in each 4 points on slab intrados to center line and center clinodiagonal and are uniformly distributed, additional casting
The point of base center 1, totally 9 points.Testing result show that slab carbon segregation degree is integrally controlled in 0.98-1.06, tracking rolling
Specification 60mm round steel is examined, and round steel center portion segregated zone significantly reduces, and 0.5 grade of banded structure rank, meets the band of user's requirement
The needs of shape tissue rank≤2.5 grade, other performance, which is examined, all meets user's requirement.
Embodiment 4:
20CrMnTiH pinion steel is produced using R10m arc billet caster, stablizes converter in 120t converter steelmaking process and is packed into
System and waste steel quality reduce tap and fluctuate, and are lower than 0.012wt% with addition of nitrogen content according to 135t molten steel amount in tapping process
Low nitrogen carbon dust and the alloy containing Si, Mn, Cr, tapping terminal C content be 0.12wt%；After the completion of converter smelting, ladle is by turning
Furnace hangs LF refining, and manganese iron, ferrosilicon, ferrochrome are added when refining 25min and accurately adjusts Si, Mn, Cr element and contains to target
Amount, and C content is adjusted in molten steel to 0.19wt%；Turn Argon stirring intensity down after LF refining 40min, stirring flow control exists
The molten steel refined is hung to RH application of vacuum by 300NL/min or so, molten steel is de-gassed and purifies, after RH refining when soft blow
Between be 20min, guarantee ladle chemistry it is uniform, reduce due to uneven chemical components caused by be segregated；After RH is refined
When molten steel carries out bull ladle, 1571 DEG C of bull ladle liquid steel temperature, on Metal in Tundish liquid level plus coverture complete stroke thermal insulating, continuous casting process control
Molten steel temperature drop processed is in the range of 25-35 DEG C；Continuous casting billet is having a size of 200 × 200mm；Chemical Composition in Cast Billet weight percent difference
Are as follows: C:0.19%, Si:0.25%, Mn:0.96%, Cr:1.12%, Ti:0.05%, P:0.011%, S:0.004%, Als:0.025%；
The target content value of each element is respectively as follows: C:0.19%, Si:0.24%, Mn:0.97%, Cr:1.12%, Ti:0.06%, P :≤
0.015%, S :≤0.008%, Als:0.023%；Meet chemical component Narrow Composition Control requirement；The practical degree of superheat is wrapped in when casting
It is 22 DEG C, casting process keeps pulling rate to cast in 1.1m/min perseverance pulling rate, Water Rate for Secondary Cooling Water 0.5L/kg.Crystallizer electromagnetism stirs
The stirring intensity mixed is 344.6A, stirring frequency 3.0Hz；The stirring intensity of solidification end electromagnetic agitation is 267.6A, stirring
Frequency is 8.3Hz.The press control of 4.8mm is carried out in casting blank solidification end, is caused with weakening central reduction to high solute concentration
Molten steel suction.
After casting, low power detection is carried out to pinion steel 20CrMnTiH continuous casting billet, and examine to Inner Quality of Billet
It surveys, testing result shows that center segregation of casting blank is rated 0.5 grade, remaining quality index is all met the requirements.To further clarify
It is inclined to carry out drilling cuttings sampling (chisel bit diameter phi 5mm) to slab using chemical analysis for segregation control situation in slab cross section
Analysis detection, sample position are distributed in each 4 points on slab intrados to center line and center clinodiagonal and are uniformly distributed, additional casting
The point of base center 1, totally 9 points.Testing result show that slab carbon segregation degree is integrally controlled in 0.98-1.05, tracking rolling
Specification 55mm round steel is examined, and round steel center portion segregated zone significantly reduces, and 0.5 grade of banded structure rank, meets the band of user's requirement
The needs of shape tissue rank≤2.5 grade, other performance, which is examined, all meets user's requirement.
Claims (8)
1. improving the control method of pinion steel small billet center segregation, it is characterised in that: narrow at sub-control including ladle chemistry
System, the control of the casting degree of superheat, cast permanent casting speed control and the control of other casting process；
The ladle chemistry Narrow Composition Control refers to the floating range for reducing pinion steel tie element target content, Ge Gecheng
Divide actual content scope control precision are as follows:
CIt is practical=CTargetC in ± 0.01% formulaIt is practical: the actual content of C,CTarget: the target content of C；
SiIt is practical=SiTargetSi in ± 0.015% formulaIt is practical: the actual content of Si, SiTarget: the target content of Si；
MnIt is practical=MnTargetMn in ± 0.03% formulaIt is practical: the actual content of Mn, MnTarget: the target content of Mn；
CrIt is practical= CrTargetCr in ± 0.025% formulaIt is practical: the actual content of Cr, CrTarget: the target content of Cr；
TiIt is practical= TiTargetTi in ± 0.01% formulaIt is practical: the actual content of Ti,TiTarget: the target content of Ti；
The casting degree of superheat control refers to that tundish degree of superheat stability contorting is within the scope of 20-35 DEG C in casting process；
The continuous casting perseverance casting speed control refers to that molten steel is cast in billet caster casting using permanent pulling rate, guarantees that two is cold
Specific water；
Other casting process control refers to molten steel in billet caster casting, using M-EMS, even
It casts solidification end and uses end electromagnetic agitation, use dynamic soft reduction technology in solidification end.
2. improving the control method of pinion steel small billet center segregation as described in claim 1, it is characterised in that: the molten steel
During chemical component Narrow Composition Control, stablize converter and be packed into system and waste steel quality, reduce tap fluctuation, guarantees tapping eventually
Point C content control is within the scope of 0.06-0.12wt%.
3. improving the control method of pinion steel small billet center segregation as described in claim 1, it is characterised in that: the molten steel
Chemical component Narrow Composition Control is completed in converter steelmaking process, carries out LF refining after the completion of converter smelting, is carried out in LF refining
Add manganese iron when 15-25min, ferrosilicon, ferrochrome are accurately adjusted to target content, and adjust C content ﹣ 0.02% in molten steel~
CTarget。
4. improving the control method of pinion steel small billet center segregation as claimed in claim 3, it is characterised in that: LF refining
30min Argon stir flow control in 100-300 NL/min, molten steel refine is hung to RH application of vacuum, be de-gassed with
Molten steel is purified, soft blow time >=10min after RH refining guarantees that ladle chemistry is uniform, reduces due to uneven chemical components
Caused by be segregated.
5. improving the control method of pinion steel small billet center segregation as claimed in claim 4, it is characterised in that: RH refining knot
Molten steel bull ladle is carried out after beam, bull ladle liquid steel temperature controls within the scope of 1570-1585 DEG C, and coverture is added on Metal in Tundish liquid level
Complete stroke thermal insulating, continuous casting process control molten steel temperature drop in the range of 25-40 DEG C.
6. improving the control method of pinion steel small billet center segregation as described in claim 1, it is characterised in that: the continuous casting
Permanent casting speed control refers in billet caster casting process using dynamic secondary cooling water distribution, and casting pulling rate is constant in 1.1m/min,
Make Water Rate for Secondary Cooling Water control in 0.5L/kg.
7. improving the control method of pinion steel small billet center segregation as described in claim 1, it is characterised in that: the casting
It in process control procedure, is cast using R10m billet caster, using M-EMS, 350 ± 20A/ of parameter
3.0 ± 0.5Hz, away from end electromagnetic agitation is arranged at crystallizer meniscus 7.2m, 250 ± 20A/8.0 of parameter ± 0.5Hz is coagulating
Gu end uses dynamic soft reduction technology.
8. improving the control method of pinion steel small billet center segregation as claimed in claim 1 or 2, it is characterised in that: described
During ladle chemistry Narrow Composition Control, stablize converter and be packed into system and waste steel quality, reduces tap fluctuation, tapped
The low nitrogen carbon dust of 120PPM is lower than with addition of nitrogen content according to molten steel amount in journey and contains the alloy of Si, Mn, Cr, guarantees tapping terminal
C content controls within the scope of 0.06-0.12wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910440076.9A CN110170631A (en) | 2019-05-24 | 2019-05-24 | Improve the control method of pinion steel small billet center segregation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910440076.9A CN110170631A (en) | 2019-05-24 | 2019-05-24 | Improve the control method of pinion steel small billet center segregation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110170631A true CN110170631A (en) | 2019-08-27 |
Family
ID=67695640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910440076.9A Pending CN110170631A (en) | 2019-05-24 | 2019-05-24 | Improve the control method of pinion steel small billet center segregation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110170631A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111283156A (en) * | 2020-03-23 | 2020-06-16 | 江苏利淮钢铁有限公司 | Method for reducing segregation in casting process of continuous casting square billet for gear |
| CN111545720A (en) * | 2020-03-30 | 2020-08-18 | 江阴兴澄特种钢铁有限公司 | Forming process for reducing carburized gear steel band-shaped structure |
| CN111590040A (en) * | 2020-04-16 | 2020-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous casting production method of small square billets for improving quality of gear steel |
| CN111679052A (en) * | 2020-06-03 | 2020-09-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail rolling region genetic characterization method based on segregation evolution law correspondence |
| 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 |
| CN113198993A (en) * | 2021-04-19 | 2021-08-03 | 鞍钢集团北京研究院有限公司 | Method for reducing center segregation of low alloy steel continuous casting billet |
| CN113913705A (en) * | 2021-09-18 | 2022-01-11 | 南京钢铁股份有限公司 | Wear-resistant steel pipe for concrete pump truck and preparation method thereof |
| CN114653907A (en) * | 2022-03-26 | 2022-06-24 | 中天钢铁集团有限公司 | Method for improving homogeneity of casting blank of high-carbon steel billet based on brand-new reduction mode |
| CN114939637A (en) * | 2022-06-14 | 2022-08-26 | 河钢乐亭钢铁有限公司 | Method for judging steel type capable of being subjected to mixed casting and judging mixed casting blank |
| CN114951572A (en) * | 2022-05-11 | 2022-08-30 | 广东韶钢松山股份有限公司 | Method for controlling center carbon segregation of small square billet of hard wire steel and hard wire steel |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103121092A (en) * | 2013-03-22 | 2013-05-29 | 北京科技大学 | Continuous casting bloom soft press technology based on tail end electromagnetic stirring |
| CN104259415A (en) * | 2014-10-23 | 2015-01-07 | 山东钢铁股份有限公司 | Continuous casting method of continuous-cast round billets |
| CN104651724A (en) * | 2015-02-11 | 2015-05-27 | 宣化钢铁集团有限责任公司 | Coil rod for pre-stressed steel strand and production method of coil rod |
| CN105568122A (en) * | 2016-03-23 | 2016-05-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Center segregation control method of phi280mm 30CrMo circular tube blank |
| CN106583676A (en) * | 2016-12-29 | 2017-04-26 | 江苏沙钢集团淮钢特钢股份有限公司 | Carbon segregation control method for continuous casting round billet for vehicle wheel |
| CN107350303A (en) * | 2017-06-08 | 2017-11-17 | 江阴兴澄特种钢铁有限公司 | A kind of production method of automobile axial workpiece steel |
| CN107502817A (en) * | 2017-08-07 | 2017-12-22 | 河钢股份有限公司邯郸分公司 | High grain size number pinion steel 20CrMnTiH and its production technology |
| CN107604250A (en) * | 2017-08-15 | 2018-01-19 | 江阴兴澄特种钢铁有限公司 | A kind of heavy truck transmission gear 21MnCrMoS steel and its manufacture method |
| CN109182905A (en) * | 2018-09-29 | 2019-01-11 | 邯郸钢铁集团有限责任公司 | Pinion steel 20CrMoSH and the technique for improving its harden ability stability |
| CN109622903A (en) * | 2019-01-18 | 2019-04-16 | 山东钢铁股份有限公司 | A kind of control method of pinion steel rectangular bloom solidified inside tissue |
-
2019
- 2019-05-24 CN CN201910440076.9A patent/CN110170631A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103121092A (en) * | 2013-03-22 | 2013-05-29 | 北京科技大学 | Continuous casting bloom soft press technology based on tail end electromagnetic stirring |
| CN104259415A (en) * | 2014-10-23 | 2015-01-07 | 山东钢铁股份有限公司 | Continuous casting method of continuous-cast round billets |
| CN104651724A (en) * | 2015-02-11 | 2015-05-27 | 宣化钢铁集团有限责任公司 | Coil rod for pre-stressed steel strand and production method of coil rod |
| CN105568122A (en) * | 2016-03-23 | 2016-05-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Center segregation control method of phi280mm 30CrMo circular tube blank |
| CN106583676A (en) * | 2016-12-29 | 2017-04-26 | 江苏沙钢集团淮钢特钢股份有限公司 | Carbon segregation control method for continuous casting round billet for vehicle wheel |
| CN107350303A (en) * | 2017-06-08 | 2017-11-17 | 江阴兴澄特种钢铁有限公司 | A kind of production method of automobile axial workpiece steel |
| CN107502817A (en) * | 2017-08-07 | 2017-12-22 | 河钢股份有限公司邯郸分公司 | High grain size number pinion steel 20CrMnTiH and its production technology |
| CN107604250A (en) * | 2017-08-15 | 2018-01-19 | 江阴兴澄特种钢铁有限公司 | A kind of heavy truck transmission gear 21MnCrMoS steel and its manufacture method |
| CN109182905A (en) * | 2018-09-29 | 2019-01-11 | 邯郸钢铁集团有限责任公司 | Pinion steel 20CrMoSH and the technique for improving its harden ability stability |
| CN109622903A (en) * | 2019-01-18 | 2019-04-16 | 山东钢铁股份有限公司 | A kind of control method of pinion steel rectangular bloom solidified inside tissue |
Non-Patent Citations (1)
| Title |
|---|
| 徐国庆等: "动态轻压下改善帘线钢中心偏析", 《现代冶金》 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111283156B (en) * | 2020-03-23 | 2021-11-02 | 江苏利淮钢铁有限公司 | Method for reducing segregation in casting process of continuous casting square billet for gear |
| CN111283156A (en) * | 2020-03-23 | 2020-06-16 | 江苏利淮钢铁有限公司 | Method for reducing segregation in casting process of continuous casting square billet for gear |
| CN111545720A (en) * | 2020-03-30 | 2020-08-18 | 江阴兴澄特种钢铁有限公司 | Forming process for reducing carburized gear steel band-shaped structure |
| CN111590040A (en) * | 2020-04-16 | 2020-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous casting production method of small square billets for improving quality of gear steel |
| CN111590040B (en) * | 2020-04-16 | 2022-04-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous casting production method of small square billets for improving quality of gear steel |
| CN111679052A (en) * | 2020-06-03 | 2020-09-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail rolling region genetic characterization method based on segregation evolution law correspondence |
| 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 |
| CN113198993A (en) * | 2021-04-19 | 2021-08-03 | 鞍钢集团北京研究院有限公司 | Method for reducing center segregation of low alloy steel continuous casting billet |
| CN113198993B (en) * | 2021-04-19 | 2022-04-26 | 鞍钢集团北京研究院有限公司 | Method for reducing center segregation of low alloy steel continuous casting billet |
| CN113913705A (en) * | 2021-09-18 | 2022-01-11 | 南京钢铁股份有限公司 | Wear-resistant steel pipe for concrete pump truck and preparation method thereof |
| CN114653907A (en) * | 2022-03-26 | 2022-06-24 | 中天钢铁集团有限公司 | Method for improving homogeneity of casting blank of high-carbon steel billet based on brand-new reduction mode |
| CN114653907B (en) * | 2022-03-26 | 2023-09-29 | 中天钢铁集团有限公司 | Method for improving homogeneity of high-carbon steel billet casting blank based on brand new depressing mode |
| CN114951572A (en) * | 2022-05-11 | 2022-08-30 | 广东韶钢松山股份有限公司 | Method for controlling center carbon segregation of small square billet of hard wire steel and hard wire steel |
| CN114939637A (en) * | 2022-06-14 | 2022-08-26 | 河钢乐亭钢铁有限公司 | Method for judging steel type capable of being subjected to mixed casting and judging mixed casting blank |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110170631A (en) | Improve the control method of pinion steel small billet center segregation | |
| KR102204170B1 (en) | Gray cast iron inoculant | |
| CN106148844A (en) | A kind of preparation method of sulfur-bearing ultralow titanium high standard bearing steel | |
| CN106312000A (en) | 18CrNiMo7-6 round billet continuous casting method for vertical type continuous casting production gear steel | |
| CN107829017A (en) | A kind of sulphur oxygen inovulant of high intensity | |
| CN105603312B (en) | A kind of manufacture method of ultrapurity armco iron | |
| CN110184548B (en) | Method for refining solidification structure of high manganese steel continuous casting billet | |
| CN110396635A (en) | A kind of smelting process improving surrender 345MPa level structure steel fatigue life | |
| CN105568122A (en) | Center segregation control method of phi280mm 30CrMo circular tube blank | |
| CN110117747A (en) | A kind of production method of high Al nitrided steel | |
| Li et al. | Characteristics of nozzle clogging and evolution of oxide inclusion for Al-killed Ti-stabilized 18Cr stainless steel | |
| CN109706404A (en) | A kind of titaniferous carbon steel and its production method | |
| CN106583676A (en) | Carbon segregation control method for continuous casting round billet for vehicle wheel | |
| CN105420445A (en) | Method for smelting coarse-grained steel | |
| CN110331249A (en) | A kind of smelting process of oil casing steel 26CrMoVTiB | |
| CN114107601A (en) | Method for refining rare earth inclusions in steel by magnesium pretreatment | |
| CN114395727A (en) | Smelting and continuous casting process of martensite precipitation hardening stainless steel | |
| CN109750131A (en) | The method that ultrasonic wave auxiliary improves spheroidal graphite cast-iron pregnant effect | |
| CN105779869A (en) | Internal quality control method of 30Mn tube bloom steel cast blanks | |
| CN109930081A (en) | A kind of petroleum casing pipe and preparation method thereof | |
| CN109554517A (en) | A kind of method of billet caster production titaniferous ferritic stainless steel small billet | |
| CN111408698B (en) | Control method for surface quality of high-strength high-aluminum high-vanadium steel casting blank | |
| CN115488298A (en) | Continuous casting billet for high-carbon steel wire and preparation method thereof | |
| CN115007821A (en) | Bloom GCr15SiMn bearing steel and smelting method thereof | |
| CN109762959B (en) | Smelting method of special steel and special steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190827 |