CN1227146A - Method and equipment for producing clad continuous cast products - Google Patents
Method and equipment for producing clad continuous cast products Download PDFInfo
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- CN1227146A CN1227146A CN 98103777 CN98103777A CN1227146A CN 1227146 A CN1227146 A CN 1227146A CN 98103777 CN98103777 CN 98103777 CN 98103777 A CN98103777 A CN 98103777A CN 1227146 A CN1227146 A CN 1227146A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005266 casting Methods 0.000 claims abstract description 36
- 239000010935 stainless steel Substances 0.000 claims abstract 2
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract 2
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 230000003534 oscillatory effect Effects 0.000 claims description 3
- 238000004320 controlled atmosphere Methods 0.000 claims description 2
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims 2
- 239000011247 coating layer Substances 0.000 claims 2
- 229910010293 ceramic material Inorganic materials 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract description 4
- 229910000975 Carbon steel Inorganic materials 0.000 abstract description 3
- 239000010962 carbon steel Substances 0.000 abstract description 3
- 238000005253 cladding Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 8
- 239000002893 slag Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000005336 cracking Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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- Continuous Casting (AREA)
- Metal Rolling (AREA)
Abstract
The method and equipment are used to produce continuously cast clad product. Here, not only vibrating crystallizer but also movable crystallizer may be used. For example, hot rolled stainless steel belt as cladding layer is fed continuously into between the wall of crystallizer and the molten carbon steel so as to be welded onto the billet part. The said method may be used in, say, two-roller casting equipment, Harzlyt equipment or wheel casting mold. The present invention may be used to produce planar product with width greater than 800 mm and thicknesss less than 10 mm, and to produce composite material.
Description
The present invention relates to a kind of metal sheet band production method and a kind ofly utilize oscillatory type crystallizer (static crystallizer) or portable crystallizer, preferably utilize the double-roller type casting device to implement the equipment of said method, wherein motlten metal and metal flat product, preferably hot-rolled band contact and with its seam together, and in above-mentioned casting device, along with motlten metal guide wire planar products (hot-rolled band) continuously, thereby it wraps the motlten metal of inflow and by the output of throwing system from each side.
Up to now, thickness is mainly produced by band hot rolling mode less than 2 millimeters planar products.Subsequently, hot-rolled band can be cold rolled to 0.2 millimeters thick always.Owing in cold-rolled process, can not adjust dimensional accuracy to precentagewise, just must in course of hot rolling, set to precentagewise plate shape and the flatness requirement that cold-strip is proposed earlier in this case.From 100: 1 generous compared with, it is infinitely-great that the flow resistance in the roll gap is actually on width, so plate shape is adjusted on precentagewise ground or flatness is impossible.Thereby up to now, thickness almost is impossible less than the size of 10mm to the development foundry engieering greater than 1000mm as obtaining width on the basis of semicontinuous production equipment.
When under the prerequisite of slag film thickness that determines by system and production like products, casting sheet billet when utilizing the oscillatory type crystallizer, as running in traditional slab production equipment, subject matter is: along with reducing casting thickness and raising casting rate, the surface that forms in the unit interval is multiplied and while slag film thickness reduces.The hot-fluid of the heat of solidification that discharges in the unit interval and inflow crystallizer increases immediately.
Fig. 1 shows the hot-fluid that forms according to casting thickness and casting rate.For example, if the critical heat flux under the situation of producing the thick slab of 200mm traditionally with 1m/min speed is approximately 1MW/m
2, then at the same time casting rate to be brought up under the situation of 6m/min, casting thickness is reduced to as 50mm and will causes hot-fluid to be increased to 2.8MW/m
2Corresponding with shrinkage index, longitudinal cracking hazard index value by as under standard slab situation 1 increase under the sheet billet situation 2.8, promptly under the same widths situation, sheet billet is 2.8 times of standard slab longitudinal cracking tendency.
Observe the border of component, its existence minimum is 0.001 or 0.02 relative slag film thickness, and this has reflected does not to a certain extent have the casting of covering slag situation.Total heat flow is approximately 5MW/m
2And on steel billet equipment, also obtain such hot-fluid, cast in unprotect slag or slag ground on this equipment.
When utilizing mobile crystallizer to cast band, there is similar hot-fluid situation.A limit point high position of observing on the border, the slag defective also causes heat flow in such technology.
Described result transfers on the band equipment and has shown:
1. not having slag waters and is cast as a large amount of heats flows into crystallizer in process of setting;
2. in casting, obviously shrink;
3. cause quite high crystallizer thermic load, this causes the dangerous and short crystallizer life-span of longitudinal cracking on strip surface.
Up to now, when on the equipment of Tape movement crystallizer as according to two roller castings (bass Mel principle), Ha Celete casting or in belt equipment and single roller casting casting thickness during less than the strand of 30mm, described problem has caused uncontrollable blemish.
At present, maximum results obtain by two rollers.In this technology, between two rollers that turn round relatively, inject molten steel symmetrically, molten steel solidifies at the narrowest roll gap place (interface point) and exports by drawing device.
Dimensional accuracy on the surface quality that is obtained and particularly width and the thickness direction (flatness and plate shape) be can not reproduce or not in the required cold-strip percentage tolerance in market.This is especially corresponding to carbon steel production.
The situation of solidifying according to steel describes below.At the casting environment that is arranged under two roller situations, steel is set on the cold roll surface very soon.About 5MW/m
2Hot-fluid radially flow into roller surface and get rid of by cooling off this roller.
Following result has appearred thus:
-bear high heat load and coldly be of a size of columniform roll-type crystallizer and generate and expand and band is pressed into negative convexity with solidifying strand in contact zone internal cause heat.But existing flakiness ratio be more than or equal to 100/1 situation under since lost in roll gap lateral flow and can not be in the processing of follow-up milling train adjustable plate shape.
-casting billet surface is parallel to roller and shrinks along casting direction and width outwardly in process of setting, cause tension thus in the base shell and cause compression in crystallizer surface.Simultaneously, crystallizer surface expands and form tension on this both direction in casting billet surface owing to heat radial and axial flows in rotation period.
This stress has caused the solid of the base shell on crystallizer surface to shrink with the stress stack that causes because of the contraction of base shell.The stress that this causes stress owing to axially (casting direction laterally) effect to generate longitudinal crack and (casting direction vertically) acts on because radially generates transversal crack.The casting size is wide more, and then absolute value is big more, and axial shrinkage is big more and to the adjustment of the acceptable flatness of percentage and big more to the influence of the adjustment of Cast Strip flawless to the influence of longitudinal cracking danger.
For example reported in different DE3440234, DE3440235, DE3440237 patent specification that banding pattern and/or roll shape move crystallizer.Friction between the surface of attempting to reduce to solidify motlten metal here and the crystallizer material also avoids ftractureing and obtaining identical surface quality thus, improves surface quality thus.It avoids being connected or seam between cold surface and the crystalline material consciously.Another kind of technology (DE3406730) has been described in the crystallizer of continuously metal sheet band being sent into horizontal continuous casting equipment with lubricated crystallizer wall.
Wide be that the problem of high hot-fluid and plate shape and flatness tolerance is still undecided up to now in 400mm-1600mm and the thickness prior art of Strip casting as the casting of band steel less than 10mm.
Thus, the objective of the invention is to propose a kind of continuous cast method and a kind of equipment of on the basis of oscillation mode crystallizer or mobile crystallizer, implementing this continuous cast method, wherein control by solidifying the hot-fluid that fused mass gives out, show as the lower critical degree thereby make to shrink, solidify simultaneously and seam takes place between fused mass and the planar products (as hot-rolled band) and guarantee best band geometry (plate shape and flatness).
This purpose is equipment or the method for utilizing as claimed in claim and make us unexpectedly realizing.
Solution of the present invention is such, and the critical contraction of solidifying casting billet surface of bearing tension is compensated by superposition acting in opposition and compression that caused by the expansion of the clad between crystallizer and molten metal.
Clad at first is subjected to condenser type (kapazitiv) heating and it still keeps colder in that side towards crystallizer wall, and clad can not bear big stress with not causing crackle there.
Below with reference to accompanying drawing 2 and Fig. 3 the present invention is described for example.
Fig. 2 shows a double-roller type casting device with feature of the present invention for example.
Molten steel enters clad 4 through tundish 1 and by a molten steel feed system 2.Between fused mass 3 and mobile crystallizer 5, at least at a lateral root according to fused mass direct packets coating continuously, clad and solidify fused mass and export together.Constitute at the same time in the solidification zone in seam district 6, solidify fused mass 7 or base shell and clad 4 seam together.Solidifying fully in the zone of ending at roller summit 8 (interface point) or strand guiding device 10 of sheet metal strip 13.The strand guiding device can be made of roller or plate, and it is used to dwindle slab thickness.Realized the raising casting rate thus and by the casting ability has been improved on final freezing point 9 pull roll summits 8 (interface point).A cooling system 14 is right after behind mobile crystallizer 5.Strand guiding zone have an outer cover 15 and can temperature control and/or controlled atmospher ground handle strand guiding zone.
Be that example is described the present invention's content relevant with process aspect with two rollers below:
The clad 4 of energy heating between mobile crystallizer 5 and molten steel 3 or base shell 7 that discharges when molten steel 3 solidifies surpasses the clad temperature T up to liquation side temperature
SolThis causes base shell and clad 4, and seam is together in the crystallizer workspace is seam district 6.In addition, the reduction fusing point material 18 that is coated on the clad side of molten steel helps seam.Because clad and the material that solidifies between the fused mass (base shell) are compound, so the tension that comes across in the base shell 7 superposes and balance with the compression 11 that comes across in the clad 4.
Can control the flatness and the shape of solidifying band thus and avoid longitudinal cracking.Thermic load as the roll-type crystallizer is reduced significantly by condenser type (kapazitiv) heat packs coating, has prolonged the crystallizer life-span simultaneously thus.
When with as when constituting clad by special steel, aluminium, copper or other non-iron group metal, can produce composite according to the present invention, particularly produce clad material, as carbon steel with stainless clad as planar products and elongated products.
Fig. 3 shows the compound basic premise condition of material of solidifying between fused mass and the clad.
Must always be less than or equal to the solidus temperature of used fused mass, i.e. T as the solidus temperature of the material of clad
SSchMore than or equal to T
SUm
When fused mass freezes solidly on the clad, though with the base shell from T
SSchBe cooled to T
SUmSituation under, still discharge the required energy of seam.
The solidus temperature of supposing the structural steel fused mass is as being 1520 ℃, then this molten steel injected by solidus temperature as being the clad that 1460 ℃ special steel constitutes.The curing heat that structural steel discharges with clad be heated to 1460 ℃ and with its seam together.Because the solidus temperature difference is 60 ℃, so special steel clad partial melting and formation seam district when integral body cooling subsequently.
The present invention also can adopt and breathe out special formula equipment in Qira and wheel shape mold (Fig. 4).
Above-mentioned the present invention who describes has for example brought following advantage:
A. because guaranteed fused mass and the clad that constitutes by special steel, non-iron group metal or other steel grade between seam, material is compound completely so controllably formed;
B. shape face of Que Dinging and flatness;
C. with high casting rate casting readily hot tearing steel;
D. substituted as a large amount of stainless products with the composite that at least one stainless surface is arranged and greatly saved cost;
E. final thickness that can be free and coating thickness;
F. new composite;
G. can realize the online joint operation of casting technique and rolling mill practice;
H. need not de-scaling by with clearly defined objective cooling;
I. owing to condenser type (kapazitiv) heat packs coating, so cause low thermic load to crystallizer;
J. can be by casting rate (production capacity) be improved on final freezing point pull roll summit (interface point);
K. improve the crystallizer durability.
Claims (14)
1. one kind is utilized oscillatory type crystallizer or mobile crystallizer continuously casting metal, particularly produces the method for coated prod, wherein motlten metal is injected into one along with in the continuous metal carbonyl coat that moves of casting rate, it is characterized in that the solidus temperature of metal carbonyl coat always is less than or equal to the solidus temperature of motlten metal.
2. the method for claim 1 is characterized in that, motlten metal preferably is made of molten steel.
3. method as claimed in claim 1 or 2 is characterized in that fused mass and clad are formed from steel.
4. as the described method of one of claim 1-3, it is characterized in that clad is made of stainless steel.
5. as the described method of one of claim 1-4, it is characterized in that clad is made of non-iron group metal.
6. as the described method of one of claim 1-5, it is characterized in that the ratio that clad accounts for gross thickness is lower than 50%.
7. as the described method of one of claim 1-6, it is characterized in that coating layer material is heated to maximum temperature T before use
Sol
8. the equipment of one of implementation method claim 1-7 is characterized in that, coating layer material (4) is guided along a surface of crystallizer at least.
9. equipment as claimed in claim 8 is characterized in that, can temperature control ground running crystallizer.
10. equipment as claimed in claim 8 or 9 is characterized in that, has adopted double-roller type crystallizer (5).
11., it is characterized in that crystallizer is made by metal and/or ceramic material as the described equipment of one of claim 8-10.
12. as the described equipment of one of claim 8-11, it is characterized in that, can in its cross section, still have under the situation of liquid core and in the strand guiding roller section, depress clad metal band (13).
13. as the described equipment of one of claim 8-12, it is characterized in that, by strengthen clad (4) at the reduction fusing point material (18) on the cover surface of fused mass and solidify fused mass or base shell (7) between material compound.
14. as the described equipment of one of claim 8-13, it is characterized in that, clad metal band (13) but pass the outer cover (15) of a controlled atmospher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98103777 CN1227146A (en) | 1998-02-27 | 1998-02-27 | Method and equipment for producing clad continuous cast products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98103777 CN1227146A (en) | 1998-02-27 | 1998-02-27 | Method and equipment for producing clad continuous cast products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1227146A true CN1227146A (en) | 1999-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98103777 Pending CN1227146A (en) | 1998-02-27 | 1998-02-27 | Method and equipment for producing clad continuous cast products |
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| Country | Link |
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| CN (1) | CN1227146A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100377814C (en) * | 2006-09-04 | 2008-04-02 | 北京科技大学 | Coating material horizontal continuous casting direct recombination forming apparatus and technology |
| CN101683709B (en) * | 2008-09-27 | 2012-11-14 | 宝山钢铁股份有限公司 | Method for continuously producing medium-caliber welded tube by strip continuous casting |
| CN104525879A (en) * | 2014-12-18 | 2015-04-22 | 山东钢铁股份有限公司 | Continuous casting production device and method for steel with surface covered with special material |
-
1998
- 1998-02-27 CN CN 98103777 patent/CN1227146A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100377814C (en) * | 2006-09-04 | 2008-04-02 | 北京科技大学 | Coating material horizontal continuous casting direct recombination forming apparatus and technology |
| CN101683709B (en) * | 2008-09-27 | 2012-11-14 | 宝山钢铁股份有限公司 | Method for continuously producing medium-caliber welded tube by strip continuous casting |
| CN104525879A (en) * | 2014-12-18 | 2015-04-22 | 山东钢铁股份有限公司 | Continuous casting production device and method for steel with surface covered with special material |
| CN104525879B (en) * | 2014-12-18 | 2016-11-23 | 山东钢铁股份有限公司 | The continuous casting of surface coverage property material steel produces Apparatus and method for |
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