CN110157855A - Carbon steel grain refiner, grain refiner core-spun yarn, preparation method and carbon steel continuous casting crystal fining method - Google Patents
Carbon steel grain refiner, grain refiner core-spun yarn, preparation method and carbon steel continuous casting crystal fining method Download PDFInfo
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- CN110157855A CN110157855A CN201910538743.7A CN201910538743A CN110157855A CN 110157855 A CN110157855 A CN 110157855A CN 201910538743 A CN201910538743 A CN 201910538743A CN 110157855 A CN110157855 A CN 110157855A
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- grain refiner
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
Abstract
The present invention relates to a kind of grain refiner of carbon steel continuous casting process, i.e. metallic cerium, which is preferably powder shaped, by mixing with Steel Melt for Continuous Casting, can be greatly improved the equiaxial crystal ratio of continuous casting billet, grain refining effect is significant, while reducing the size of steel inclusion.The present invention also provides a kind of grain refiner products convenient for being added in molten steel, i.e. a kind of grain refiner core-spun yarn containing metallic cerium, and a kind of crystal fining method of carbon steel continuous casting process, specifically mix the grain refiner core-spun yarn with molten steel using crystallizer Feed aluminum wire, suitable for continuous casting process.The method of the addition grain refiner metallic cerium feeds the speed of silk by control, and the additive amount of automation, online accurate control cerium powder can be realized.
Description
Technical field
The present invention relates to metal material grain refinement technology field, a kind of carbon steel grain refiner, crystalline substance are more particularly related to
The crystal fining method of grain fining agent core-spun yarn, preparation method and carbon steel continuous casting process.
Background technique
The solidified structure of molten steel has important influence to steel performance, and the intensity that steel not only can be improved in crystal grain refinement may be used also
To improve the toughness of steel.The solidified structure of steel is divided into surface fine grained region, columnar zone and isometric crystalline region.Surface fine grained region thickness compared with
Small, the performance for influencing less on performance, therefore improving cast steel is mainly to pay close attention to the distribution of column crystal and isometric crystalline region.
Although the trunk of column crystal is purer, interdendritic microsegregation is serious, because of the deposition being mingled with, column crystal interface structure
At plane of weakness, crackle easily extends, and when processing is easy to crack, and column crystal, which sufficiently develops, easily forms transcrystallization structure, leads to center porosity,
Reduce the consistency of steel.In contrast, equiaxed grain structure densification, intensity, plasticity, toughness etc. are higher, and processing performance is good,
Ingredient, structure are uniform, without apparent anisotropy, therefore all should try to control for most steel grades the hair of column crystal
Exhibition, and expand equiax crystal width, therefore it is necessary to carry out the control of grain structure refinement.
1., pulsed current annealing currently, the method for controlling grain structure refinement in the process of setting of molten steel mainly has:
Method；2. ultrasonication method；3. electromagnetic agitation facture；4. mechanical mixing method；5. chemical method.Wherein pulse current and ultrasonic wave
It handles the requirement height to equipment, put into greatly, magnetic field processing is then relatively limited to the improvement of grain structure refinement；Mechanical stirring can introduce
The disadvantages of impurity, operating difficulties, big consumption, is quickly cooled down difficult to realize especially for the continuous casting of large round billet；Chemical method it is thin
Change effect stability, effect are fast, easy to operate, and use a kind of relatively broad method.Chemical method is included in smelting process
Promote Heterogeneous Nucleation, coarse as-cast structure is made to become tiny equiax crystal, improve equiax crystal proportion, realizes that crystal grain is thin
Change.Grain refiner is added during solidification of molten steel also with the theory of heterogeneous forming core, carbon steel in process of setting first
Delta ferrite or γ austenite is precipitated, and in molten steel the crystal structure of certain dystectic fine foreign matters and molten steel primary phase
It is similar, degree of supercooling very little needed for forming core, therefore the Heterogeneous Nucleation of molten steel can be promoted, to improve nucleation rate, reach crystal grain
The effect of refinement.All had the grain refiner commercially produced for magnesium alloy currently on the market, but there is no at
The ripe grain refiner commodity for being exclusively used in steel.As Chinese patent CN1396960A announce " the crystal fining method of steel, steel
Grain refining alloy and produce grain refining alloy method ", Chinese patent announce CN102134637A announce " middle height
The crystal fining method of temperature alloy steel large forgings " and Chinese patent CN102234706A announce " nuclear reactor evaporator
Method for refining grains of heavy forging steel " be by into molten steel be added grain refining alloy with achieve the effect that refine crystal grain, but
It is that these methods can not make the size of steel inclusion become smaller, while not be advantageously applied in continuous casting process.
Summary of the invention
(1) technical problems to be solved
In order to solve the above problem of the prior art, the present invention provides a kind of carbon steel grain refiner, grain refiner packet
Core wire, preparation method and the crystal fining method being applied in carbon steel continuous casting process.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include:
The application on one side, provides a kind of carbon steel grain refiner, and the carbon steel grain refiner is metallic cerium.
Preferably, the metallic cerium purity is 99.9% or more.
Preferably, the metallic cerium is powder, and partial size is not more than 0.147mm.
Further aspect of the application provides a kind of grain refiner core-spun yarn, it includes iron sheet clad and fills out
Fill the cerium powder in the iron sheet clad；The iron sheet clad is elongated hollow tube, which is filled in the hollow pipe.
Further aspect of the application provides a kind of preparation method of grain refiner core-spun yarn, which comprises
S1: hot pressing: under vacuum or inert ambient environment, cerium powder being elaborated on iron sheet, to cerium powder while heating
Apply pressure with iron sheet, iron sheet and cerium powder are compacted；
S2: volume covers: iron sheet being covered into iron sheet hollow pipe, and cerium powder is coated among the iron sheet hollow pipe；
S3: line processed: carrying out clinching edge sealing to the iron sheet hollow pipe, obtain iron packet cerium core wire, which is crystalline substance
Grain fining agent core-spun yarn.
Further, in step S1, vacuum pressure is not more than 100Pa, and inert atmosphere is the argon gas of 99.9% or more purity
Atmosphere.
Further, in step S1, apply pressure and be no less than 1Mpa.
Further, in step S1, the heating temperature is 400~600 DEG C.
Further, in step S1, the mass ratio of cerium powder and iron sheet is 1:(1~2).
As another aspect of the application, a kind of crystal fining method of carbon steel continuous casting process, the method are provided
It is: mixes molten steel with carbon steel grain refiner described in any of the above-described embodiment or grain refiner core-spun yarn.
Preferably, grain refiner and phase molten steel contained in the grain refiner or the grain refiner core-spun yarn
When mixing, the dosage of cerium is 100-1000g/t.I.e. every 1t molten steel mixing 100-1000g cerium powder.
Preferably, the method is: mixing the grain refiner core-spun yarn with molten steel using crystallizer Feed aluminum wire
It closes.
Preferably, using crystallizer Feed aluminum wire, feeding wire speed determines as follows: according to the throwing speed in continuous casting process
The speed of silk is fed in degree and Cross Section of CC Billet size, control, it may be assumed that
Determine continuous casting billet cross sectional area S1, drawing speed v1, the density of molten steel is ρSteel, in grain refiner core-spun yarn
The cross-sectional area S of cerium core2, feeding wire speed v2, the density of cerium powder is ρCerium, the target additive amount k of grain refiner, by as follows
Formula determines feeding wire speed v2:
S1·v1·ρSteelK=S2·v2·ρCerium (1)
Preferably, when determining the target additive amount k of grain refiner in above-mentioned formula, it need to guarantee the ratio of itself and molten steel mixing
Example is 100-1000g/t.I.e. every 1t molten steel mixing 100-1000g cerium powder.
(3) beneficial effect
The beneficial effects of the present invention are:
Firstly, present invention determine that a kind of grain refiner of carbon steel continuous casting process, i.e. metallic cerium.Wherein it is preferred to gold
Belonging to cerium purity is preferably 99.9% or more.
In addition, the present invention also provides a kind of grain refiner product convenient for being added in molten steel, i.e., it is a kind of to contain gold
Belong to the grain refiner core-spun yarn of cerium comprising outside is coated in the iron sheet clad of hollow tubular structures with the iron sheet is filled in
Metallic cerium powder inside layer.
Further, the present invention more provides a kind of crystal fining method of carbon steel continuous casting process, specifically uses crystallizer
Feed aluminum wire mixes the grain refiner core-spun yarn with molten steel, suitable for continuous casting process.The addition crystal grain is thin
The method of agent metallic cerium feeds the speed of silk by control, and the additive amount of automation, online, accurate control cerium powder can be realized.
The control method for feeding the speed of silk can be according to the drawing speed in continuous casting process, Cross Section of CC Billet size, molten steel
The cross section of cerium core in density, grain refiner core-spun yarn, the density of cerium powder, metallic cerium target additive amount k etc. determine.
Experimental data shows by adding grain refiner (metallic cerium) of the invention in carbon steel continuous casting process, can be with
The equiax crystal accounting of continuous casting billet is greatly improved, grain refining effect is significant, while reducing the size of steel inclusion.
Detailed description of the invention
Fig. 1 is the cross-sectional configuration schematic diagram of grain refiner core-spun yarn of the present invention.
When Fig. 2 is addition grain refiner core-spun yarn front and back and various ce contents, pair of crystalline grain of steel size in as cast condition steel sample
Than figure.
Fig. 3 is SEM and the EDS figure of typical field trash in steel after addition grain refiner core-spun yarn.
Fig. 4 is the comparison diagram of steel inclusion distribution when various ce contents after addition grain refiner core-spun yarn.
[description of symbols]
1: iron sheet clad；2: cerium powder.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.
As shown in Figure 1, devising crystal grain as shown in Figure 1 to preferably apply grain refiner in continuous casting process
Fining agent core-spun yarn.
As shown in Figure 1, the grain refiner core-spun yarn includes winding in the iron sheet clad 1 of central tubular and is filled in this
Metallic cerium powder 2 among iron sheet clad 1.The iron sheet clad 1 plays curable type, carrying accommodates, is convenient for the effects of conveying, and is somebody's turn to do
Metallic cerium powder 2 is then as the carbon steel grain refiner for mixing and contact, play Grain Refinement Effect with molten steel.In carbon steel continuous casting mistake
Cheng Zhong, when which is mixed with molten steel, iron sheet clad 1 is fused into liquid, and metallic cerium powder 2 is discharged
It is mixed into molten steel, with molten steel realization.And iron sheet clad 1 will not bring impurity to molten steel.
Preferably, metallic cerium powder is commercialization metallic cerium powder, and purity is 99~99.9%, more preferably 99.9% or more；
Further, partial size is not more than 0.147mm.
Above-mentioned grain refiner core-spun yarn can be used any mode and prepare in conjunction with Fig. 1 and related description, but as long as system
Final structure is obtained as shown in Figure 1, then should also be as within the scope of the present invention.
Preferably, above-mentioned grain refiner core-spun yarn can go to prepare as follows:
S1: hot pressing: under vacuum or inert ambient environment, cerium powder being elaborated on iron sheet, is being heated to 400~600 DEG C
While (preferably 500 DEG C), apply the pressure for being no less than 1Mpa (preferably 2Mpa) to cerium powder and iron sheet, by iron sheet and cerium powder
Compacting；Wherein, the mass ratio of cerium powder iron sheet is 1:(1~2), preferably 1:2.
Wherein, vacuum pressure is not more than 100Pa (preferably 10~50Pa), and inert atmosphere is the argon of 99.9% or more purity
Gas atmosphere.Wherein, it is more excellent that thickness of scale, which is 0.3~0.5mm,.Iron sheet is blocked up to will lead to cerium powder and iron sheet pressure is not firm, it is excessively thin then
Leakage cerium powder can be generated in feeding silk transmission process.
S2: volume covers: iron sheet being covered into iron sheet hollow pipe, and cerium powder is coated among the iron sheet hollow pipe；
S3: line processed: carrying out clinching edge sealing to the iron sheet hollow pipe, obtain iron packet cerium core wire, which is crystalline substance
Grain fining agent core-spun yarn.
In following example 1-2, by metallic cerium powder (commercialization metallic cerium powder, purity: 99%~99.9999%) as brilliant
Grain fining agent is added in Steel Melt for Continuous Casting, to verify metallic cerium powder as carbon steel grain refiner, is produced to the as cast condition steel completed is smelted
Raw influence.
Embodiment 1
Influence of the grain refiner to casting blank crystal grains tissue
Steel grades are as shown in table 1, feed silk mode by crystallizer in molten steel continuous casting process, feed crystal grain of the invention
Fining agent core-spun yarn is fed the speed of silk by control, distinguishes the amount of being actually added into of metallic cerium powder in grain refiner core-spun yarn
For 400g/t and 800g/t, i.e., the effective quantity that metallic cerium is added in molten steel per ton is 400g/t and 800g/t.
1 steel grades of table/wt%
After the completion of smelting, the post-etching by as cast condition steel sample in identical position progress cutting sampling, grinding and polishing to mirror surface goes out crystalline substance
Boundary.Corrosive liquid selects nital, etching time 5s.It is observed using Zeiss metallographic microscope, as a result such as Fig. 2
It is shown.
Wherein, it is not add crystalline substance that Fig. 2 (b), Fig. 2 (c), which are steel sample, Fig. 2 (a) after adding grain refiner core-spun yarn respectively,
Typical metallograph in grain fining agent steel sample.
Wherein: Ce content is that Ce content is 0.008% in the as cast condition steel sample of 0, Fig. 2 (b) in the as cast condition steel sample of Fig. 2 (a), figure
Ce content is 0.037% in 2 (c) as cast condition steel sample.
Compared with Fig. 2 (a), the crystal grain in Fig. 2 (b) and Fig. 2 (c) is more tiny, and wherein the crystal grain in Fig. 2 (c) is the most
It is tiny, therefore can illustrate to add the refinement that Ce is conducive to crystal grain into Steel Melt for Continuous Casting.
Embodiment 2
Influence of the grain refiner to steel inclusion
It is mingled with to being not added with above-mentioned grain refiner core-spun yarn and being added in the steel after above-mentioned grain refiner core-spun yarn
Object is analyzed and is counted, and carries out the observation of field trash pattern to the steel sample after polishing with scanning electron microscope.Wherein, Fig. 3 is to add
The SEM and EDS of typical field trash in steel after above-mentioned grain refiner core-spun yarn has been added to scheme.Fig. 4 be not added with and be added to it is above-mentioned
After grain refiner core-spun yarn, the comparison diagram of the distribution of field trash in the steel sample of various ce contents, wherein abscissa corresponds to steel sample
Middle Ce content.
As shown in figure 3, the field trash of generation is mainly Ce after addition grain refiner2O2S。
As shown in figure 4, Ce content is 0 in steel sample, wherein ratio of the crystal grain greater than 5 μm reaches 12% or more, and crystal grain is 1
~2 μm, 1 μm of < of ratio is respectively in 26% and 27%；And in the steel sample that Ce content is 0.008%, 0.037%, crystal grain is greater than 5
μm ratio decline it is obvious that dropping to about 8% and 6% respectively.Crystal grain is fairly obvious in the ratio increase of 1~2 μm, 1 μm of <,
And Ce content is in 0.037% steel sample, crystal grain is the most significant greater than the reduction of 5 μm of ratio, crystal grain is 1~2 μm, 1 μm of <
Ratio increase is the most significant.In addition, crystal grain is successive in 2-3 μm of ratio in the steel sample that Ce content is 0.008%, 0.037%
Apparent decline is also presented in the steel sample for being 0 in Ce content.
It can be seen that can play really by the way that metallic cerium is added into Steel Melt for Continuous Casting and increase equiax crystal accounting, reduce in steel
The effect of the size of field trash has significant grain refining effect.
The above described is only a preferred embodiment of the present invention, being not the limitation for doing other forms to the present invention, appoint
What those skilled in the art can use the equivalence enforcement that technology contents disclosed above were changed or be modified as equivalent variations
Example.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to the above embodiments
What simple modification, equivalent variations and remodeling, still falls within the protection scope of technical solution of the present invention.
Claims (10)
1. a kind of carbon steel grain refiner, which is characterized in that the carbon steel grain refiner is metallic cerium.
2. carbon steel grain refiner according to claim 1, which is characterized in that the metallic cerium purity be 99.9% with
On.
3. carbon steel grain refiner according to claim 1, which is characterized in that the metallic cerium is powder, and partial size is not
Greater than 0.147mm.
4. a kind of grain refiner core-spun yarn, which is characterized in that the grain refiner core-spun yarn includes: iron sheet clad and
The cerium powder being filled in the iron sheet clad；The iron sheet clad is elongated hollow tube, which is filled in the hollow pipe.
5. a kind of preparation method of grain refiner core-spun yarn, which comprises
S1: hot pressing: under vacuum or inert ambient environment, cerium powder being elaborated on iron sheet, to cerium powder and iron while heating
Skin applies pressure, and iron sheet and cerium powder are compacted；
S2: volume covers: iron sheet being covered into iron sheet hollow pipe, and cerium powder is coated among the iron sheet hollow pipe；
S3: line processed: clinching edge sealing is carried out to the iron sheet hollow pipe, obtains iron packet cerium core wire, which is that crystal grain is thin
Agent core-spun yarn.
6. preparation method according to claim 5, it is characterised in that: in step S1, vacuum pressure is not more than 100Pa, lazy
Property atmosphere be 99.9% or more purity argon atmosphere；Apply pressure and is no less than 1Mpa；Heating temperature is 400~600 DEG C.
7. a kind of crystal fining method of carbon steel continuous casting process, which is characterized in that the method is: making molten steel and claim 1-
Carbon steel grain refiner described in 3 or grain refiner core-spun yarn as claimed in claim 4 mix.
8. crystal fining method according to claim 7, which is characterized in that the method is: the grain refiner or
When contained grain refiner is mixed with phase molten steel in the grain refiner core-spun yarn, the dosage of cerium is 100-1000g/t.
9. crystal fining method according to claim 7, which is characterized in that the method is: using crystallizer Feed aluminum wire
Mix the grain refiner core-spun yarn with molten steel.
10. crystal fining method according to claim 9, which is characterized in that use crystallizer Feed aluminum wire, feeding wire speed is pressed
As under type determines: according to the drawing speed and Cross Section of CC Billet size in continuous casting process, the speed of silk is fed in control, it may be assumed that
Determine continuous casting billet cross sectional area S1, drawing speed v1, the density of molten steel is ρSteel, cerium core in grain refiner core-spun yarn
Cross-sectional area S2, feeding wire speed v2, the density of cerium powder is ρCerium, the target additive amount k of grain refiner, by following formula
Determine feeding wire speed v2:
S1·v1·ρSteelK=S2·v2·ρCerium。
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| CN201910538743.7A CN110157855A (en) | 2019-06-20 | 2019-06-20 | Carbon steel grain refiner, grain refiner core-spun yarn, preparation method and carbon steel continuous casting crystal fining method |
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2019
- 2019-06-20 CN CN201910538743.7A patent/CN110157855A/en active Pending
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| CN1481953A (en) * | 2002-09-12 | 2004-03-17 | 曾宪刚 | Tombarthite core-spun yarn for continuous casting |
| JP2017196626A (en) * | 2016-04-25 | 2017-11-02 | 新日鐵住金株式会社 | Continuous casting method for molten steel |
| JP2018015794A (en) * | 2016-07-29 | 2018-02-01 | 新日鐵住金株式会社 | Manufacturing method of low carbon steel thin slab, low carbon steel thin slab, and manufacturing method of low carbon steel thin steel sheet |
| CN109252087A (en) * | 2018-11-07 | 2019-01-22 | 北京科技大学 | The alloying technology that Ce inhibits TiN complex inclusion to be formed is added in bearing steel |
| CN109234492A (en) * | 2018-11-23 | 2019-01-18 | 辽宁科技学院 | A kind of calcium line splash inhibitor and calcium core-spun yarn and preparation method thereof |
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| 华正利 等: "非均质形核细化16Mn钢凝固组织", 《北京科技大学学报》 * |
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