CN106563780B - The continuous cast method of high alloy tool steel large round billet in a kind of medium high carbon - Google Patents
The continuous cast method of high alloy tool steel large round billet in a kind of medium high carbon Download PDFInfo
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- CN106563780B CN106563780B CN201610931000.2A CN201610931000A CN106563780B CN 106563780 B CN106563780 B CN 106563780B CN 201610931000 A CN201610931000 A CN 201610931000A CN 106563780 B CN106563780 B CN 106563780B
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- alloy tool
- tool steel
- round billet
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- continuous cast
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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
- B22D11/111—Treating the molten metal by using protecting powders
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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
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1226—Accessories for subsequent treating or working cast stock in situ for straightening 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
- B22D11/16—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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
Abstract
The invention discloses a kind of continuous cast method of high alloy tool steel large round billet in medium high carbon, this method includes：In casting process, molten steel overheat control is at 10 DEG C~30 DEG C, and M-EMS Current is controlled in 250A~350A, and FREQUENCY CONTROL is in 1.0~2.0Hz, and solidification end electromagnetic agitation current control is in 300A~400A, and FREQUENCY CONTROL is in 5.0~8.0Hz；The molten steel has following composition：C content >=0.30%, Cr content >=3.0% sums up gold content >=5%.The method of the present invention the shortcomings that can overcoming high alloy tool steel hardness height, be not easy to align, while avoiding the secondary oxidation of molten steel, ensure that product quality, simple production process, lumber recovery height by setting and Optimizing Process Parameters.The alloy tool steel produced has structural homogenity good, the excellent feature of comprehensive mechanical property.
Description
Technical field
The invention belongs to field of metallurgy, and in particular to the continuous cast method of high alloy tool steel large round billet in a kind of medium high carbon.
Background technology
Tool and mould is known as " modern industry is female ", indelible contribution is made that modern industry, in modern work
Importance in industry is self-evident.Mould steel is in the most important component part of mold and mold materials using the widest
General material is the important material carrier of tool and mould manufacturing industry and technical foundation, and kind, specification and quality are to tool and mould
Performance, service life and manufacturing cycle play conclusive effect.
Currently, domestic medium high carbon high alloy tool steel relies primarily on molding production, continuous casting medium high carbon high alloy is used
The difficult point of tool steel is that the comparision contents of the elements such as C, Cr, Mo are high, and such steel grade has preferable elevated temperature strength and heat fatigue
Stability, for example, H13,9Cr5Mo etc., are allowed for such steel grade and need prodigious rectify when being produced using circular-arc type continuous casting machine in this way
Straight power, existing technique is difficult to realize, and only a small number of enterprises can use billet production at present.
There are more disadvantages for existing tool steel production technology：First, molding production cannot be continuous, efficiency is low, in order to ensure
Product quality, Steel ingot feeder head need to cut off, and lumber recovery is less than 90%；Second is that square billet cannot meet the market demand, existing square billet
Technique is only capable of producing the square billet that maximum section is 400mm × 380mm specifications, is controlled by electroslag furnace shape, need diameter of phi 450~
Raw material of the round billet of 700mm specifications as electroslag remelting in addition to obtaining the rolling ratio of bigger, and then obtains preferably internal
Quality, it is also desirable to which the continuous cast round billets of big specification are as stocking masterbatch.
When producing big continuous cast round billets, since casting blank shape changes, the cooling of strand, straightening process change
Become, due to casting blank shape to be ensured, round billet cannot use dynamic soft reduction technology when producing, it is ensured that Inner Quality of Billet is more
It is difficult.
With the swift and violent growth of the industries such as automobile making, device fabrication, tool steel is applied to the market demand of civil field
Amount also increases, and therefore, researching and developing the tool steel production technology of a kind of high efficiency, high-quality and low cost becomes associated production
The direction of the effort for it of enterprise.
There has been the continuous cast method report of production round billet in the country at present, but the steel grade of its production and the performance of product are equal
Cannot meet the needs of current enterprise, main cause is that these methods are primarily adapted for use in low-alloy structural steel and low carbon structure
Steel, in production in high-carbon when high alloy tool steel, strand aligning is difficult, and problem loose, that shrinkage cavity is serious just exposes out,
Existing continuous cast method is difficult to meet needs.
Invention content
It is an object of the present invention to provide high alloys in the production medium high carbon of a kind of high efficiency, high-quality and low cost
The continuous cast method of tool steel large round billet.
It is another object of the present invention to provide high alloy tool steel large round billet in a kind of medium high carbon.
The present invention provides a kind of continuous cast methods of high alloy tool steel large round billet in medium high carbon, include the following steps：
In casting process, at 10 DEG C~30 DEG C, M-EMS Current is controlled in 250A for molten steel overheat control
~350A, FREQUENCY CONTROL exist in 1.0~2.0Hz, solidification end electromagnetic agitation current control in 300A~400A, FREQUENCY CONTROL
5.0~8.0Hz；
The molten steel has following composition：C content >=0.30%, Cr content >=3.0% sums up gold content >=5%.
In above-mentioned casting process, centre is surrounded by backpack cover covering, and molten steel adds carbonization using tundish covering flux in tundish
Rice husk bilayer covers, and used crystallizer protecting residue basicity is 0.55~0.65, and fusion temperature is 1150 DEG C~1170 DEG C, is glued
Degree is 1.4PaS~1.6PaS.
The molten steel has following composition：C content >=0.30%, Cr content >=3.0% sums up gold content >=5%.
Preferably, it in casting process, is connected using big packet long nozzle between ladle and tundish, big packet long nozzle and ladle
Argon gas is passed through at the gap of slide gate nozzle, argon flow amount is controlled in 4~6Nm3/ h uses tundish between tundish and crystallizer
The depth of liquid steel level is inserted into 100~130mm in monoblock type submersed nozzle, the mouth of a river.It is furthermore preferred that the mouth of a river moves up for every eight hours
10~15mm.
Preferably, in casting process, using permanent casting speed control, according to the difference of steel grade and the degree of superheat, the first stove pulling rate control
System is in 0.2~0.4m/min, and corresponding specific water's control is in 0.07~0.1L/kg, after strand initially enters withdrawal straightening machine, subsequently
The casting speed control of heat is in 0.18~0.38m/min, and corresponding specific water's control is in 0.06~0.1L/kg.
Preferably, it connects and states in casting process, round billet is aligned using the method for continuous straightening, align strain rate control
It makes 0.20% hereinafter, the pressure setting of last two framves withdrawal straightening machine is consistent.
Preferably, enter to cheat slow cooling after the completion of continuous casting billet cutting.
Crystallizer mould flux of good performance can be selected in crystallizer of the present invention with steel splitting kind.
The present invention uses molding casting, prevents secondary oxidation of steel, avoids causing continuous casting billet internal soundness defect.
The present invention stirs parameter, low overheat by reasonably controlling electricity, stablizes the measures point such as pulling rate and rational specific water
Scattered solidification two-phase section solute element aggregation, reduction center segregation, improvement solidified structure, and then the center porosity of guarantee strand≤
1.0 grades, shrinkage cavity≤0.5 grade.
The present invention is by reasonably adjusting Casting speed so that the aligning of strand is carried out in best plastic zone, by reasonable
Each withdrawal straightening machine pressure of distribution so that strand is fully aligned.
The method of the present invention can be used for the continuous cast round billets of a diameter of 450~700mm, can be very good to overcome medium high carbon height
Alloy tool steel hardness in straightening process is high, is not easy the difficulty aligned, while ensure that the internal soundness of strand well.
Description of the drawings
Fig. 1 shows the whole branch shape appearance figure of a diameter of 700mm round billets obtained according to the method for the present invention；
Fig. 2 shows the acidleach in the center cross section of a diameter of 700mm round billets obtained according to the method for the present invention is low
Scheme again.
Fig. 3 shows the whole branch shape appearance figure of a diameter of 650mm round billets obtained according to the method for the present invention；
Fig. 4 shows that the acidleach in the center cross section of a diameter of 650mm round billets obtained according to the method for the present invention is low
Scheme again.
Specific implementation mode
The present invention is described in further details with reference to embodiment：
Embodiment 1
Full arc radius is used to produce diameter 700mm H13 mould steel continuous cast round billets for 16.5m conticasters, often stream there are 9 framves
Withdrawal straightening machine aligns strand.
In casting process, at 30 DEG C, M-EMS Current is controlled in 260A the control of the first stove molten steel overheat,
FREQUENCY CONTROL is in 1.5Hz, and solidification end electromagnetic agitation current control is in 360A, and FREQUENCY CONTROL is in 7.5Hz, the first stove casting speed control
In 0.20m/min, corresponding specific water is 0.086L/kg, and centre is surrounded by backpack cover covering, and molten steel is coated using intermediate in tundish
Lid agent adds carbonization rice husk bilayer to cover, and using H13 special crystallizer covering slags, basicity 0.62, fusion temperature is 1155 DEG C, is glued
Degree is 1.4PaS.
It is connected using big packet long nozzle between ladle and tundish, is led at the gap of big packet long nozzle and steel ladle sliding water gap
Enter argon gas, argon flow amount is controlled in 4.5Nm3/ h uses tundish monoblock type submersed nozzle, water between tundish and crystallizer
Mouth is initially inserted into the depth of liquid steel level in 120mm, and every 8 stove changes a slag line, above carries 10mm every time.
After strand initially enters withdrawal straightening machine, adjustment pulling rate is 0.18m/min, and corresponding specific water's control is in 0.08L/
Kg controls the degree of superheat of molten steel within the scope of 10~20 DEG C since the second stove.
In casting process, round billet is aligned using the method for continuous straightening, the setting of withdrawal straightening machine pressure see the table below.
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Pressure/MPa | 5 | 7 | 9 | 10.5 | 13.5 | 14 | 14 | 16 | 16 |
It is as shown in Figure 1 that the present embodiment obtains the whole branch pattern of diameter 700mm H13 mould steel continuous cast round billets, it can be seen that strand
Glacing flatness is good, macrostructure as shown in Fig. 2, macrostructure defect by YB/T4149 appendix A judge pictures evaluate, center porosity≤
1.0 grades, shrinkage cavity≤0.5 grade, without centre burst and middle crack.
Embodiment 2
It uses full arc radius to produce diameter 650mm 70Cr3NiMo tool steel continuous cast round billets for 16.5m conticasters, often flows
There are 9 frame withdrawal straightening machines to align strand.
In casting process, at 30 DEG C, M-EMS Current is controlled in 300A the control of the first stove molten steel overheat,
FREQUENCY CONTROL is in 1.2Hz, and solidification end electromagnetic agitation current control is in 360A, and FREQUENCY CONTROL is in 6.0Hz, the first stove casting speed control
In 0.25m/min, corresponding specific water is 0.09L/kg, and centre is surrounded by backpack cover covering, and molten steel is coated using intermediate in tundish
Lid agent adds carbonization rice husk bilayer to cover, and uses 9Cr5Mo special crystallizer covering slags, basicity 0.63, fusion temperature 1156
DEG C, viscosity 1.4PaS.
It is connected using big packet long nozzle between ladle and tundish, is led at the gap of big packet long nozzle and steel ladle sliding water gap
Enter argon gas, argon flow amount is controlled in 4.4Nm3/ h uses tundish monoblock type submersed nozzle, water between tundish and crystallizer
Mouth is initially inserted into the depth of liquid steel level in 120mm, and every 8 stove changes a slag line, above carries 10mm every time.
After strand initially enters withdrawal straightening machine, adjustment pulling rate is 0.24m/min, and corresponding specific water's control is in 0.086L/
Kg, since the second stove, the degree of superheat of molten steel is within the scope of 10~19 DEG C.
In casting process, round billet is aligned using the method for continuous straightening, the setting of withdrawal straightening machine pressure see the table below.
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Pressure/MPa | 10 | 11 | 12 | 13 | 14 | 18 | 27 | 30 | 30 |
It is good that the present embodiment obtains diameter 650mm 70Cr3NiMo mould steel continuous cast round billets glacing flatness, as shown in figure 3, low
Times tissue as shown in figure 4, macrostructure defect by YB/T4149 appendix A judge pictures evaluation, center porosity≤1.0 grade, shrinkage cavity≤
0.5 grade, without centre burst and middle crack.
It should be noted that as described above is only to explain the preferred embodiments of the invention, it is right according to this to be not intended to
The present invention is subject to any form of limitation, therefore all have any modification for making the related present invention under identical spirit
Or change, it should all be included in the scope that the invention is intended to protect.
Claims (6)
1. the continuous cast method of high alloy tool steel large round billet in a kind of medium high carbon, the method include the following steps：
In casting process, molten steel overheat control at 10 DEG C~30 DEG C, M-EMS Current control 250A~
350A, FREQUENCY CONTROL is in 1.0~2.0Hz, and solidification end electromagnetic agitation current control is in 300A~400A, and FREQUENCY CONTROL is 5.0
~8.0Hz；
The molten steel has following composition：C content >=0.30%, Cr content >=3.0% sums up gold content >=5%；
In casting process, using permanent casting speed control, the first stove casting speed control is in 0.2~0.4m/min, corresponding specific water's control
In 0.07~0.1L/kg, after strand initially enters withdrawal straightening machine, the casting speed control of follow-up heat is right in 0.18~0.38m/min
The specific water answered controls in 0.06~0.1L/kg.
2. the continuous cast method of high alloy tool steel large round billet in medium high carbon according to claim 1, which is characterized in that continuous casting
In the process, centre is surrounded by backpack cover covering, and molten steel adds carbonization rice husk bilayer to cover using tundish covering flux in tundish, is used
Crystallizer protecting residue basicity be 0.55~0.65, fusion temperature be 1150 DEG C~1170 DEG C, viscosity be 1.4PaS~
1.6Pa·S。
3. the continuous cast method of high alloy tool steel large round billet in medium high carbon according to claim 1, which is characterized in that continuous casting
In the process, it is connected using big packet long nozzle between ladle and tundish, is led at the gap of big packet long nozzle and steel ladle sliding water gap
Enter argon gas, argon flow amount is controlled in 4~6Nm3/ h uses tundish monoblock type submersed nozzle between tundish and crystallizer,
The depth of liquid steel level is inserted into 100~130mm in the mouth of a river.
4. the continuous cast method of high alloy tool steel large round billet in medium high carbon according to claim 3, which is characterized in that every 8
The hour mouth of a river moves up 10~15mm.
5. the continuous cast method of high alloy tool steel large round billet in medium high carbon according to claim 1, which is characterized in that continuous casting
In the process, round billet is aligned using the method for continuous straightening, aligning strain rate control is 0.20% hereinafter, last two frame is drawn
The pressure setting for the machine of rectifying is consistent.
6. the continuous cast method of high alloy tool steel large round billet in medium high carbon according to claim 1, which is characterized in that continuous casting
Enter to cheat slow cooling after the completion of base cutting.
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| CN115007814B (en) * | 2022-06-22 | 2024-02-06 | 广东韶钢松山股份有限公司 | Continuous casting production method of bloom hot-working die steel H13 and bloom hot-working die steel H13 casting blank |
| CN115652181B (en) * | 2022-10-14 | 2024-02-09 | 山东钢铁股份有限公司 | Manufacturing method of steel large round billet for high-carbon low-alloy hot roller |
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| JP2006315020A (en) * | 2005-05-11 | 2006-11-24 | Sumitomo Metal Ind Ltd | Continuous casting method |
| CN102010926B (en) * | 2010-11-24 | 2012-06-06 | 南京钢铁股份有限公司 | Process for smelting and producing medium high carbon steel |
| CN103480809A (en) * | 2013-07-08 | 2014-01-01 | 山西太钢不锈钢股份有限公司 | Continuous casting method for wide high-carbon martensitic stainless steel plate blank |
| CN104259415B (en) * | 2014-10-23 | 2016-08-24 | 山东钢铁股份有限公司 | A kind of continuous cast method of continuous cast round billets |
| CN105543646A (en) * | 2015-12-15 | 2016-05-04 | 安徽楚江特钢有限公司 | Production process for medium-high carbon steel through thin slabs |
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Inventor after: Liu Bing Inventor after: Ge Wenying Inventor after: Li Jinhao Inventor after: Liang Na Inventor after: Ouyang Zhengrong Inventor after: Liu Li Inventor before: Liu Bing Inventor before: Ge Wenying Inventor before: Li Jinhao Inventor before: Liang Na Inventor before: Ouyang Zhengrong Inventor before: Liu Li |
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