CN108480588A - A kind of continuous casting billet production method of mould steel - Google Patents
A kind of continuous casting billet production method of mould steel Download PDFInfo
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- CN108480588A CN108480588A CN201810293949.3A CN201810293949A CN108480588A CN 108480588 A CN108480588 A CN 108480588A CN 201810293949 A CN201810293949 A CN 201810293949A CN 108480588 A CN108480588 A CN 108480588A
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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
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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
-
- 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
- B22D11/168—Controlling or regulating processes or operations for adjusting the mould size or mould taper
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
- Continuous Casting (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a kind of continuous casting billet production methods of mould steel, mainly include the following steps that：1）If the double Phase cooling techniques of textura epidermoidea make blank surface tissue that second-order phase transition occur by strong cold variation, and crystal grain thinning improves plasticity；2）The double segregation control techniques of slighter compress, by the variation of slighter compress parameter, control centre's segregation and dendritic segregation improve structural homogenity；3）Outer arc double precision control technique in crystallizer can effectively reduce the mechanical stress that strand initial solidification shell is subject in streamline, so that the mechanical strain suffered by strand is less than the plastic limit of strand, to avoid the generation and extension of strand crackle.The present invention does not increase new equipment or processing step, by the optimization of manufacturing process, realizes the control of continuous casting billet structure and the promotion of quality.
Description
Technical field
The present invention relates to continuous casting producing method, more particularly to the continuous casting billet production method of a kind of mould steel.
Background technology
Mould steel is the steel for manufacturing cutting tool, measurer, mold and wear resistant tools.Require higher hardness
High rigidity and red hardness and high wearability and toughness appropriate can be kept at high temperature.With Chinese national economy
Development, application of the mould steel in every field are also more and more extensive.High-quality mould steel requires steel pure；Tissue is equal
It is even, tiny；Accurate size, so that steel have the characteristics that good moulding processability, toughness, wearability, fatigue performance.
Mould steel be widely used it is general, wherein the fields such as communications and transportation, aerospace, military project core work be tool and mould application weight in it
Weight, therefore the application of mould steel proposes iron and steel raw material very high requirement：1）Thickness is accurate, uniform；2）Any surface finish, nothing
Spot, without scar, without scratch, without face crack etc.；3）Yield strength is uniform, without apparent directionality；4）Uniform elongation is high；5）Qu Qiang
Than low；6）Processing hardening is low.Other than above-mentioned performance, while should also have good processing performance, should such as have
Certain mechanical behavior under high temperature, thermal fatigue property, thermal conductivity and corrosion resistance etc..So the quality requirement of mould steel
It is high, production difficulty is big, be to have attracted worldwide attention in steel industry and insoluble problem.
《A kind of mould steel processing technology》, open (bulletin) number CN105478469A, the invention discloses a kind of work moulds
Have steel processing technology, including step：1) steel billet is heated to hot-rolled temperature；2) steel billet feeding blooming mill is tentatively rolled, shape
At blank or finished product；3) steel billet is sheared by hot shears and is segmented；4) multi-pass roughing is carried out to the steel billet, is formed
Intermediate blank；5) the intermediate blank is cut end to end and is segmented by hot shears；6) to the upper and lower of the steel billet and left and right
The finish rolling of both sides alternately multi-pass forms finished product rolled piece；7) traversing marshalling；8) the finished product rolled piece length is sheared；9)
Finished product is collected into burial pit；Above-mentioned mould steel processing technology using steel billet as raw materials for production, steel billet by cogging, roughing,
Finish rolling etc. repeatedly rolling after, marshalling in a row and be cut into needs specification formed finished product, compared with prior art, the technique with
Repeatedly rolling replaces forging, to improve lumber recovery, mould steel surface accuracy and properties of product.
《A kind of preparation method of high uniformity mould steel》, (bulletin) number CN106011420A is disclosed, and the present invention discloses
A kind of preparation method of high uniformity mould steel, step are：After carrying out melting, casting to mould steel, obtain from power consumption
Pole stick；Electroslag remelting is carried out to consutrode stick, obtains mould steel ingot casting；Mould steel ingot casting is carried out at stress relief annealing
Reason eliminates the internal stress of mould steel ingot casting；Mould steel ingot casting after annealing is opened at a temperature of 800~1000 DEG C
Base changes inside ingot structural state；2 are heated at a temperature of 1000~1100 DEG C to the mould steel ingot casting after low temperature cogging
~10h makes inside ingot carbide decompose nodularization, size refinement；Mould steel ingot casting after high temperature spheroidising is carried out normal
Rule processing, obtains final products.The mould steel produced using this method, carbide size is tiny, is evenly distributed, product group
Knit quality height.
Invention content
It is pure the purpose of the present invention is being directed to high-quality mould steel requirement steel；It is even tissue, tiny；Accurate size,
The big problem of production difficulty provides a kind of continuous casting steel billet production method of mould steel.
A kind of technical scheme of the present invention, continuous casting billet production method of mould steel, includes the following steps：
A, textura epidermoidea's two-phase becomes cooling step：
Using continuous taper or more taper crystallizers is cooled down by force, crystallizer intensity of cooling is more than 5 DEG C/S；Mould reverse taper exists
Between 1.15%/m ~ 1.35%/m；
Crystallizer foot roll and bending section vertical area cool down by force, intensity of cooling >=20 DEG C/S；
Below bending section vertical area and adjacent sectors weak cold but, intensity of cooling≤5 DEG C/S；
By double Phase cooling techniques of strong cold-weak cold, i.e., gas is reduced by strong cold, the continuous taper of crystallizer of crystallizer big yield
Gap is cold by force, bending section top big yield is cold by force, so that blank surface temperature rapid cooling is reduced to 650 ± 50 DEG C, makes blank surface tissue
Alpha ferrite is changed by γ austenites；Below bending section vertical component and the small water weak cold of adjacent 1-2 fan-shaped section, make again
Blank surface temperature recovery makes blank surface tissue be again transformed into γ austenites by alpha ferrite to 1050 ± 30 DEG C, to make
2 phase transformations occur for blank surface tissue（Two-phase becomes）, promote in blank surface crystal boundary（Ti Nb) etc. carboritrides disperse analysis
Go out, control microscopic structure and reduces strand transverse fissure sensibility；Membranaceous ferrite is can inhibit simultaneously to generate along austenite circle, then
Interior generation in austenite crystal avoids transcrystalline ductile fracture, strand plasticity from greatly enhancing, to refine blank surface crystal grain, control
The generation and extension of strand crackle.
B, the double segregation rate-determining steps of slighter compress：
It is mainly the macroscopic view flowing for controlling molten steel for center segregation, position of soft reduction is appropriate forward, solidification solid rate fs=
Between 0.4 ~ 0.8, and drafts cannot be too big, 4 ~ 6mm of drafts；
Dendritic segregation is mainly the reallocation of solute, and position of soft reduction will solidify solid rate fs=0.65 ~ 0.95 suitably rearward
Between, and drafts is big, 6 ~ 10mm of drafts.
By double segregation control techniques of center segregation-dendritic segregation, the center segregation and branch of continuous casting steel billet are effectively controlled
Brilliant segregation defects defect, so that the effectively banded structure defect of control mould steel hot rolled plate, guarantee tissue and performance is uniform
Property.
C, outer arc double precision rate-determining steps in crystallizer：
Crystallizer requires interior outer arc two-sided simultaneously to arc arc with bending section, makes to exist to arc tolerance with bending section between crystallizer
Between 0~0.3mm；
Outer arc is two-sided in the requirement of the verticality of crystallizer and bending section measures simultaneously, makes inside and outside arc perpendicular segment head rollers and last roller
Between vertical point deviation a≤0.5mm；
Outer arc is two-sided in the requirement of copper plate of crystallizer flatness error measures simultaneously（It is 1 point intermediate, each 2 points of left and right, totally 5 points of surveys
Amount）, make outer arc copper coin flatness error≤0.2mm in crystallizer.
By the double precision control technique of outer arc in crystallizer, it can effectively reduce what strand initial solidification shell was subject in streamline
Mechanical stress makes the mechanical strain suffered by strand be less than the plastic limit of strand, to avoid the generation and extension of strand crackle.
Beneficial effects of the present invention：Do not increase new equipment or processing step, passes through control device precision and each technique ring
The implementation process of section, the mould steels such as process production S45C, 30CrMo, 40MnB, 50CrV4,65Mn using the present invention
When, it realizes the control of continuous casting billet structure and the promotion of quality, steel is pure；It is even tissue, tiny；Accurate size, steel have
The features such as good moulding processability, toughness, wearability, fatigue performance, has fully met the high-accuracy processing of mould steel
The demand of manufacture.
Description of the drawings
Fig. 1 is flow sheet of the present invention.
Fig. 2 is the comparison diagram of the double Phase cooling technique specimen cross section metallographic structure patterns of 1 textura epidermoidea of embodiment.
Fig. 3 is the comparison diagram of the double segregation control technique sample macrostructures of 2 slighter compress of embodiment.
Fig. 4 is the comparison diagram that outer arc double precision controls technique strand corner crack in 3 crystallizer of embodiment.
1- crystallizers in figure, 2- bending section verticals area, 3- bending sections are to arc, 4- copper plate of crystallizer.
Specific implementation mode
Below in conjunction with attached drawing, the preferred embodiment of the present invention is described in detail.
The production procedure of the present invention, need to be in entire continuous casting steel billet as shown in Figure 1, to obtain the continuous casting steel billet of high quality
Production procedure is strictly controlled, and includes mainly the following aspects：
1, the double Phase cooling techniques of textura epidermoidea, specifically include following 4 steps：
Using continuous taper or more taper crystallizers 1 is cooled down by force, crystallizer intensity of cooling is more than 5 DEG C/S；Mould reverse taper
Between 1.15%/m ~ 1.35%/m；
Crystallizer foot roll and bending section vertical area the last 2 are cooling, intensity of cooling >=20 DEG C/S；
2 or less bending section vertical area and adjacent sectors weak cold but, intensity of cooling≤5 DEG C/S.
By double Phase cooling techniques of strong cold-weak cold, i.e., subtracted by strong cold, the continuous taper of crystallizer of crystallizer big yield
Small air gap is cold by force, bending section top big yield is cold by force, so that blank surface temperature rapid cooling is reduced to 650 ± 50 DEG C, makes blank surface
Tissue is changed into alpha ferrite by γ austenites；Below bending section vertical component and the small water weak cold of adjacent 1-2 fan-shaped section,
Make blank surface temperature recovery to 1050 ± 30 DEG C, blank surface tissue is made to be again transformed into γ austenites by alpha ferrite, to
Make blank surface tissue that 2 phase transformations occur（Two-phase becomes）, promote in blank surface crystal boundary（Ti Nb) etc. carboritrides disperse
It is precipitated, controls microscopic structure and reduces strand transverse fissure sensibility；Membranaceous ferrite is can inhibit simultaneously to generate along austenite circle, then
The interior generation in austenite crystal avoids transcrystalline ductile fracture, strand plasticity from greatly enhancing, to refine blank surface crystal grain, control
The generation and extension of strand crackle processed.
2, the double segregation control techniques of slighter compress, specifically include following 2 contents：
It is mainly the macroscopic view flowing for controlling molten steel for center segregation, position of soft reduction is appropriate forward, solidification solid rate fs=
Between 0.4 ~ 0.8, and drafts cannot be too big, 4 ~ 6mm of drafts；
Dendritic segregation is mainly the reallocation of solute, and position of soft reduction will solidify solid rate fs=0.65 ~ 0.95 suitably rearward
Between, and drafts is big, 6 ~ 10mm of drafts.
By double segregation control techniques of center segregation-dendritic segregation, the center segregation and branch of continuous casting steel billet are effectively controlled
Brilliant segregation defects defect, so that the effectively banded structure defect of control mould steel hot rolled plate, guarantee tissue and performance is uniform
Property.
3, outer arc double precision control technique in crystallizer specifically includes following 3 contents：
Crystallizer requires interior outer arc two-sided simultaneously to arc arc with bending section, makes to exist to arc tolerance with bending section between crystallizer
Between 0~0.3mm；
Outer arc is two-sided in the requirement of the verticality of crystallizer and bending section measures simultaneously, makes inside and outside arc perpendicular segment head rollers and last roller
Between vertical point deviation a≤0.5mm；
Outer arc is two-sided in the requirement of copper plate of crystallizer flatness error measures simultaneously（It is 1 point intermediate, each 2 points of left and right, totally 5 points of surveys
Amount）, make outer arc copper coin flatness error≤0.2mm in crystallizer.
By the double precision control technique of outer arc in crystallizer, it can effectively reduce what strand initial solidification shell was subject in streamline
Mechanical stress makes the mechanical strain suffered by strand be less than the plastic limit of strand, to avoid the generation and extension of strand crackle.
Above-mentioned manufacturing process is primarily directed to the larger mould steel continuous casting steel billet of production difficulty；Using the production system
Technique is made, the control of continuous casting billet structure is realized and the promotion of quality, quality pass rate is substantially improved.Implementation process is simple and easy to do,
Effect is very notable.
The method of the present invention on 4 conticasters through implementing, and originally long-standing mould steel is difficult to batch, economy, stablizes
The problem of production is thoroughly resolved, and mould steel production capacity is promoted by 2000 tons/year to 200,000 tons/year, improves 100 times, in addition,
The control of control, the phase transformation of the continuous casting initial solidification shell grain size of the present invention, the control method of dendritic segregation and center segregation, it is complete
It can use for reference and be applied in the production of other variety steels such as other high-carbon, high-strength, fine entirely, extend steel grade production range.
Embodiment 1, using the double Phase cooling techniques of textura epidermoidea when mould steel produces, more than crystallizer and bending straight
650 ± 50 DEG C are as cold as by force, below bending straight and two cold-zone top weak colds, is risen again to 1050 ± 30 DEG C, obtained specimen cross section
The comparison of metallographic structure pattern such as Fig. 2.A samples are common process, and the metallographic structure pattern in section is typical Widmannstatten structure, table
There are membranaceous pro-eutectoid ferrites in face, to cause the deterioration of its plasticity.B samples use the double Phase cooling techniques of textura epidermoidea,
The metallographic structure in section is made of granular ferrite and pearlite, and crystal grain is tiny, even tissue, and plasticity is good.
Embodiment 2 controls position of soft reduction when mould steel produces using the double segregation control techniques of slighter compress, center segregation
It is appropriate forward, between solidification solid rate fs=0.4 ~ 0.8,4 ~ 6mm of drafts；It is appropriate that dendritic segregation controls position of soft reduction
Rearward, between solidification solid rate fs=0.65 ~ 0.95,6 ~ 10mm of drafts.The comparison of obtained specimen cross section metallographic structure pattern
Such as Fig. 3.A samples are common process, and segregation is serious；B samples are the double segregation control techniques of slighter compress, and segregation is inclined slight.
Embodiment 3, using outer arc double precision control technique in crystallizer, crystallizer and bending section pair when mould steel produces
The verticality of arc ＜ 0.3mm, crystallizer and bending section measure a ＜ 0.5mm, copper plate of crystallizer measurement of planeness ＜ 0.2mm, all
Using the two-sided measurement control of interior outer arc.The mechanical stress that strand initial solidification shell is subject in streamline can be effectively reduced, strand institute is made
The mechanical strain received is less than the plastic limit of strand, to avoid the generation and extension of strand crackle.Fig. 4 is casting machine accuracy improvements
Front and back strand corner crack comparison diagram.A samples are common process, severe crack；Outer arc double precision controls in b sample crystallizers,
There is no crackle.
Claims (1)
1. a kind of continuous casting billet production method of mould steel, it is characterized in that：Include the following steps：
A, textura epidermoidea's two-phase becomes cooling step：
Using continuous taper or more taper crystallizers is cooled down by force, crystallizer intensity of cooling is more than 5 DEG C/S；Mould reverse taper exists
Between 1.15%/m ~ 1.35%/m；
Crystallizer foot roll and bending section vertical area cool down by force, intensity of cooling >=20 DEG C/S, strand show temperature be as cold as 650 by force ±
50℃；
Below bending section vertical area and adjacent sectors weak cold but, intensity of cooling≤5 DEG C/S, strand show temperature rise again to
1050±30℃；
B, the double segregation rate-determining steps of slighter compress：
When generative center is segregated：Position of soft reduction is forward, between solidification solid rate fs=0.4 ~ 0.8,4 ~ 6mm of drafts；
When generation dendritic segregation：Position of soft reduction rearward, between solidification solid rate fs=0.65 ~ 0.95,6 ~ 10mm of drafts；
C, outer arc double precision rate-determining steps in crystallizer：
Crystallizer requires interior outer arc two-sided simultaneously to arc arc with bending section, makes to exist to arc tolerance with bending section between crystallizer
Between 0~0.3mm；
Outer arc is two-sided in the requirement of the verticality of crystallizer and bending section measures simultaneously, makes inside and outside arc perpendicular segment head rollers and last roller
Between vertical point deviation a≤0.5mm；
Outer arc is two-sided in the requirement of copper plate of crystallizer flatness error measures simultaneously, makes outer arc copper coin flatness error in crystallizer
≤ 0.2mm。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113275532A (en) * | 2021-05-25 | 2021-08-20 | 重庆钢铁股份有限公司 | Method for preventing longitudinal crack bleed-out of continuous casting slab |
| CN113505482A (en) * | 2021-07-08 | 2021-10-15 | 张家港荣盛特钢有限公司 | Method and device for solving taper curve of copper pipe of square billet crystallizer and storage medium |
| CN114088503A (en) * | 2021-11-19 | 2022-02-25 | 中天钢铁集团有限公司 | Method for verifying accuracy of secondary cooling solidification model |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0970650A (en) * | 1995-09-04 | 1997-03-18 | Sumitomo Electric Ind Ltd | Production of continuously cast billet |
| CN101585077A (en) * | 2009-06-26 | 2009-11-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Cooling method for preventing microcracks on wheel steel continuous casting slabs |
| CN101733376A (en) * | 2008-11-11 | 2010-06-16 | 攀钢集团研究院有限公司 | Axle steel continuous casting method |
| CN103846401A (en) * | 2014-03-01 | 2014-06-11 | 首钢总公司 | Secondary cooling process for improving surface quality of extra-thick slab |
| CN105057626A (en) * | 2015-08-27 | 2015-11-18 | 东北大学 | Control system and method for grain refinement of corners of continuous casting billets |
| CN105839002A (en) * | 2016-05-30 | 2016-08-10 | 内蒙古包钢钢联股份有限公司 | Continuous casting process for bainite steel billet |
-
2018
- 2018-03-30 CN CN201810293949.3A patent/CN108480588A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0970650A (en) * | 1995-09-04 | 1997-03-18 | Sumitomo Electric Ind Ltd | Production of continuously cast billet |
| CN101733376A (en) * | 2008-11-11 | 2010-06-16 | 攀钢集团研究院有限公司 | Axle steel continuous casting method |
| CN101585077A (en) * | 2009-06-26 | 2009-11-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Cooling method for preventing microcracks on wheel steel continuous casting slabs |
| CN103846401A (en) * | 2014-03-01 | 2014-06-11 | 首钢总公司 | Secondary cooling process for improving surface quality of extra-thick slab |
| CN105057626A (en) * | 2015-08-27 | 2015-11-18 | 东北大学 | Control system and method for grain refinement of corners of continuous casting billets |
| CN105839002A (en) * | 2016-05-30 | 2016-08-10 | 内蒙古包钢钢联股份有限公司 | Continuous casting process for bainite steel billet |
Non-Patent Citations (1)
| Title |
|---|
| 朱苗勇: "《连铸坯的偏析及其控制》", 30 November 2015, 冶金工业出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113275532A (en) * | 2021-05-25 | 2021-08-20 | 重庆钢铁股份有限公司 | Method for preventing longitudinal crack bleed-out of continuous casting slab |
| CN113505482A (en) * | 2021-07-08 | 2021-10-15 | 张家港荣盛特钢有限公司 | Method and device for solving taper curve of copper pipe of square billet crystallizer and storage medium |
| CN113505482B (en) * | 2021-07-08 | 2024-03-08 | 张家港荣盛特钢有限公司 | Method and device for obtaining taper curve of copper pipe of square billet crystallizer and storage medium |
| CN114088503A (en) * | 2021-11-19 | 2022-02-25 | 中天钢铁集团有限公司 | Method for verifying accuracy of secondary cooling solidification model |
| WO2023087633A1 (en) * | 2021-11-19 | 2023-05-25 | 中天钢铁集团有限公司 | Method for verifying accuracy of secondary cooling solidification model |
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