CN103008587A - Generation method of anti-oxidation iron sheet by thin strip casting - Google Patents
Generation method of anti-oxidation iron sheet by thin strip casting Download PDFInfo
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Abstract
The invention relates to a generation method of an anti-oxidation iron sheet by thin strip casting, which comprises the following steps of: 1) smelting: the molten steel is smelted to the desired composition, and the steel is tapped to be poured; 2) pouring: the molten steel passes through a ladle, a tundish, and a submerged nozzle or flow distributor to enter a closed molten pool formed by crystallization rolls, and is cooled by the crystallization rolls and is slightly rolled to form a cast strip; 3) coating of an anti-oxidation coating: the surface of the cast strip going out of the crystallization rolls is sprayed with the anti-oxidation coating which comprises the following components in percentage by weight: SiO2: 60 to 75%, Al2O3: 7 to 10% , CaO: 3 to 8%, MgO: 1 to 4%, Na2O: 0.2 to 1.2%, K2O: 0.1 to 0.5%, Cr2O3: 1.2 to 3%, and the balance being binder; the casting speed of the cast strip is 10 to 120m/min, the coating speed is 50m / s - 200m / s, and the coating thickness is controlled between 20 and 140 mum; and 4) clearing of the anti-oxidation coating: after the cast strip is sprayed and water-cooled, the temperature of the cast strip is reduced, and the anti-oxidation coating is fragmented and is cleared along with high-pressure descaling.
Description
Technical field
The present invention relates to strip continuous casting technology, particularly the anti-oxidation iron sheet of a kind of thin strap continuous casting generation method.
Background technology
In recent decades, along with the progress of continuous casting technology and the raising of on-line computer control degree, the metallurgy industry of every country wishes to reduce energy consumption and the production cost of steel and iron industry always in the world, becomes the diligent target of pursuing of researchers so molten steel direct pouring can be gone out finished product.
One of thin strap continuous casting principal mode is the crystallization roll of molten steel process High Rotation Speed, and is frozen into the 2-5mm Cast Strip under the effect of roll-force.The basic craft course of at present thin strap continuous casting production is: strip caster (two rollers, single roller, a tyre type) confined chamber one kink one pinch roll one hot rolling (single chassis or two a frames or nothing) control cold is batched.In molten steel enters rotation through long nozzle, tundish and submersed nozzle from ladle water-cooled crystallization roll and the molten bath of side seal board formation, cooling through the water-cooled crystallization roll forms the Cast Strip, by swing guide, pinch roll the Cast Strip rollgang is delivered in the Cast Strip, through hot-rolling mill, spraying cooling, flying shear is until coiling machine.
Strip continuous casting technology since have save cost, dwindle plant area, reduce energy consumption, the advantage such as enhance productivity, this technology is just becoming the focus of researcher's research of every country now, also b referred to as the revolutionary technology of metallurgy industry simultaneously.
Because thin strap continuous casting is that the high-temperature molten steel after the fusing directly is poured between two rollers, utilizes the Quench of two rollers to form solidified shell at casting roller surface, then the casting by two rollers forms the Cast Strip.So band steel exports temperature is generally higher, can reach 1100～1300 ℃, when so the Cast Strip of high temperature contacts with the atmosphere of oxidisability, be easy to form iron scale on the surface, Cast Strip, be attached to the surface, Cast Strip thereby in follow-up rolling and curly course, form defective.
Analyzed the mechanism of production of iron scale in " generation and the countermeasure of simple analysis Surfaces of Hot Rolled Strip iron scale blemish " (" this steel technology ", Zhao Di, Jiang Yunan, the 1st phase in 2008) literary composition.Point out in the literary composition because steel billet and steel band heat in heating furnace or the condition of high temperature under contact with oxidizing atmosphere after generation chemical reaction generation Fe
3O
4, Fe
2O
3, FeO a kind of mixture.When temperature was higher than 700 ℃, FeO generated at the internal layer near steel band, accounts for 95%; Fe
3O
4Generate in the intermediate layer, account for 4%; Fe
2O
3Generate at outermost layer, account for 1%.
Point out in " the hot rolling strip steel scale origin cause of formation and countermeasure " (" steel rolling " 2007 by the end of June the 3rd phase of 24 volumes) literary composition, the iron scale that the main fingerboard base of Surfaces of Hot Rolled Strip iron scale defective or belt steel surface generate is not completely removed, and is pressed into a kind of surface quality defect that belt steel surface causes in the operation of rolling.Slab is heated to 1150～1250 ℃ in having the heating furnace of oxidizing atmosphere, steel slab surface contacts with high-temperature furnace gas and generates the thick iron scale of 2mm～3mm, be called the once oxidation iron sheet, the once oxidation iron sheet is pressed into the band steel through after the finish rolling, be distributed on the belt steel surface with being fleck, bulk spot and ribbon grain out-of-shape, normal with coarse pit shape; After the de-scaling, can form the iron scale about 100 μ m in rolling process of rough rolling, be called the secondary oxidation iron sheet, its secondary oxidation iron sheet shows as red squama layer, is pressed into belt steel surface after rolling and is obvious strip, is zonal distribution along rolling direction; The high temperature belt steel surface is combined the oxide layer that forms and is called iron scale three times in the finishing stands after roughing with airborne oxygen, and three iron scales are pressed into belt steel surface and are graininess, the salt grains that many pictures that distribute disperse.
Chinese patent CN 97110577.4 has gone out a kind of method that prevents that the Cast Strip defective from producing.Be that molten steel solidifies the formation solidified shell in the Quench mould surface.Mould surface has the texture structure of convex-concave regular shape, and select the molten steel chemical composition, so that the deoxidation products that produces in the casting pool forms the thick layer less than 5 μ m in mould surface, when molten steel cools formed described solidified shell to liquidus temperature is following, described layer major part was liquid.This has suppressed because the blemish that the solid-oxide premature deposit forms in the metal surface of solidifying on mould surface for the layer of liquid state substantially.
Chinese patent CN200480005103.1 has proposed a kind of method of coming reduce injection defect by the chemical analysis in the control molten steel and the amount of inclusions.Use has the molten steel at least about the total oxygen content of 70ppm and the free oxygen content between 20 to 60ppm, and allows most of oxide inclusions to be in the temperature of liquid condition.Total oxygen content is 100Oppm at least, and free oxygen content 30 and 5Oppm between.The steel band of producing by the method can have the per unit area density apart from about 2 microns dark, every square centimeter of at least 120 oxide inclusions of belt surface.
After above-mentioned patent all proposes the control strip rolling-casting, how to control and reduce the method for iron scale generation under the high temperature.
In the hot-strip of routine was produced, the method that adopts for the control of iron scale was:
(1) by reducing heating-up temperature, reducing time inside furnace, regulating furnace atmosphere is inclined to one side reducing atmosphere, and the inhibition stove is given birth to iron scale and generated;
(2) can optimize water nozzle height, angle by improving the de-scaling water pressure, adjusting, improve vertical roller side pressure energy power and reduce the roughing iron scale;
(3) reduce roller and give birth to the iron scale measure: adopt the good roll material of hot-cracking resistance, adopt rational grinding system, in time remove up hill and dale the remaining crackle of roller surface; Adopt lubrication and rolling, improve roller surface quality, reduce the Rack Unit roll-force, prevent from causing the roller surface micro-crack extension and producing roller and give birth to iron scale because the unit roll-force is excessive; The roll cooling water frame entrance water yield strengthens intermediate stand roll cooling water amount less than the outlet water yield, guarantees that roll cools off rapidly; Enter final rolling temperature≤1030 ℃, reduce finish rolling upstream breast roll temperature.
(4) finishing stand side spray water drops into, and can reduce iron scale and be pressed into;
(5) improve the covering slag quality, reduce covering slag and be involved in, guarantee that the descaling of steel stock effect can reduce the covering slag iron sheet.
(6) optimize the steel chemical composition, do not affect the mechanical properties and the basis of other performance on, reduce C, Si constituent content as far as possible, improve Mn, Al content.
Summary of the invention
The object of the invention is to propose the anti-oxidation iron sheet of a kind of thin strap continuous casting generation method, upper and lower surface in the Cast Strip behind the thin strap continuous casting moulding by casting applies one deck inoxidzable coating, this coating adopts the method for atomized spray that the coating drop is injected into surfaces of metallic strip, coating solution is bonded together with the high temperature Cast Strip after dropping in the strip surface spreading, form simultaneously the face coat of one deck densification, can play the effect of good secluding air, prevent that the strip surface from forming oxide-film.
For achieving the above object, technical scheme of the present invention is:
The anti-oxidation iron sheet of a kind of thin strap continuous casting generation method comprises the steps:
1) smelt, to required composition, it is to be poured to tap with smelting molten steel;
2) cast, molten steel enters in the airtight molten bath that the crystallization roll by High Rotation Speed forms through submersed nozzle or current distribution device through ladle, tundish, cooling and the slight rolling formation Cast Strip of process crystallization roll;
3) inoxidzable coating applies, and the anti-oxidation particle of the Cast Strip surface spraying that goes out crystallization roll is formed inoxidzable coating, and inoxidzable coating composition percentage by weight is: SiO
260～75%, Al
2O
37～10%, CaO 3～8%, and MgO 1～4%, Na
2O 0.2～1.2%, K
2O 0.1～0.5%, Cr
2O
31.2～3%, the surplus binding agent; Cast Strip pulling rate 10～120m/min, coating speed 50m/s～200m/s, coating layer thickness are controlled at 20～140 μ m;
4) inoxidzable coating is removed, and the Cast Strip is after process spray water-cooled, and the Cast Strip temperature reduces, and inoxidzable coating is cracked, along with high pressure descaling is removed.
Further, binding agent adopts Na
2SiO
2, silica or clay etc.
As preferentially, when the Cast Strip pulling rate is 10～30m/min, coated weight 50g/min～100g/min; When the Cast Strip pulling rate is 30～60m/min, coated weight 80g/min～150g/min; When the Cast Strip pulling rate is 60～90m/min, coated weight 100g/min～180g/min; When the Cast Strip pulling rate is 90～120m/min, coated weight 130m/s～200m/s.
According to method of the present invention, after the Cast Strip goes out crystallization roll, the inoxidzable coating of surface rapid coated formation one deck densification, the surface adhesion thing of the similar glassy phase of this coating formation tightly is bonded in the surface, Cast Strip, be coated on the upper and lower surface of Cast Strip, so that air can't contact the Cast Strip, thereby secluding air prevents from forming oxide-film on the surface, Cast Strip.The thereupon motion of Cast Strip, its surface temperature progressively reduces, when through the water-cooled spraying cooling, watch crystal phase bur during owing to the expanding with heat and contract with cold of Cast Strip and itself difference of shrinkage factor separate, glassy phase is pulverized simultaneously, thoroughly separate with the Cast Strip at follow-up purging through gases at high pressure, the Cast Strip is the temperature step-down subsequently, enters curling.
The inoxidzable coating that the anti-oxidation iron sheet of thin strap continuous casting of the present invention generates, its composition percentage by weight is: SiO
260～75%, Al
2O
37～10%, CaO 3～8%, and MgO 1～4%, Na
2O 0.2～1.2%, K
2O 0.1～0.5%, Cr
2O
31.2～3%, the surplus binding agent.
In the present invention, Main Ingredients and Appearance is SiO
2And Al
2O
3Coating have higher fusing point, can under higher temperature, remove rapid condensation behind the moisture in the coating after the spraying and do not melt, this be so that coating can form good infiltration with the surface, Cast Strip, thereby so that coating can be close to the Cast Strip; Remaining forms the effect that batching has the smooth compact surfaces of formation in the coating, has large surface tension based on it, can shrink rapidly in the process that moisture is discharged, thereby form fine and close dope layer.
Beneficial effect of the present invention
1, at home and abroad in the publication of thin strap continuous casting and the report, not yet find to utilize to spray coating and carry out the method that anti-oxidation iron sheet generates.
2, spraying method of the present invention is simple, sprayed coating and steel plate high temperature contact are good, and coating has sufficiently high refractoriness and refractoriness under load, have good pliability and spreadability under hot state, increased the compactness of film, effectively isolated environment atmosphere.
3, the Cast Strip surface coating becomes fragile when low temperature, separates with the Cast Strip, removes easily.
4, any chemical reaction and infiltration do not occur in coating and parent metal, and steel microstructure and performance are had no adverse effects.
Description of drawings
Fig. 1 is the schematic diagram of the embodiment of the invention.
Fig. 2 is the local enlarged diagram that the present invention sprays.
The specific embodiment
Referring to Fig. 1, Fig. 2, the anti-oxidation iron sheet of thin strap continuous casting of the present invention generation method comprises the steps: 1) smelt, to required composition, it is to be poured to tap with smelting molten steel; 2) cast, molten steel enters in the airtight molten bath that the crystallization roll by High Rotation Speed forms through submersed nozzle or current distribution device through ladle, tundish, cooling and the slight rolling formation Cast Strip of process crystallization roll; 3) inoxidzable coating applies, and the anti-oxidation particle of the Cast Strip surface spraying that goes out crystallization roll is formed inoxidzable coating, and inoxidzable coating composition percentage by weight is: SiO
260～75%, Al
2O
37～10%, CaO 3～8%, and MgO 1～4%, Na
2O 0.2～1.2%, K
2O 0.1～0.5%, Cr
2O
31.2～3%, the surplus binding agent; Cast Strip pulling rate 10～120m/min, coating speed 50m/s～200m/s, coating layer thickness are controlled at 20～140 μ m; 4) inoxidzable coating is removed, and the Cast Strip is after process spray water-cooled, and the Cast Strip temperature reduces, and inoxidzable coating is cracked, along with high pressure descaling is removed.
Molten steel is injected in the tundish 3 by large bag 1 and long nozzle 2, weir 4, gear dam 5 is set in order to removal of inclusions in the tundish, when the molten steel in the tundish 3 builds up to certain liquid level 6, opens and waters.Molten steel is injected in the current distribution device 8 by distributor 7, current distribution device 8 is arranged in crystallization roll by aperture 10 uniformly with molten steel---in the molten bath 9 between two rollers 11, because two roller 11 surface temperatures are lower, high-temperature molten steel forms solidified shell on two rollers 11 surfaces, along with the rolling formation Cast Strip 13 of two rollers 11.
After Cast Strip 13 formed, spraying of inoxidzable coating carried out on 13 two sides, 12 pairs of Cast Strips of spray-coating device that start the inoxidzable coating of two roller 11 belows.
The inoxidzable coating on 13 surfaces, Cast Strip is attached on 13 surfaces, Cast Strip, can completely cut off and the contacting of air, and prevents that high temperature Cast Strip 13 from oxidations occuring form iron scales.When the Cast Strip moved to spray section 14, because the effect of cooling water, the Cast Strip temperature reduced, and surface anti-oxidation coat becomes fragile and comes off.Inert blowing gas sweeping device 15 is set after spray section 14, is used for the inoxidzable coating on 13 surfaces, Cast Strip is purged totally, the Cast Strip is rolled by the wrapper structure and is formed casting volume 16 subsequently.
Inoxidzable coating composition embodiment of the present invention is referring to table 1.
Table 1 unit: percentage by weight
| Embodiment | SiO 2 | Al 2O 3 | CaO | MgO | Na 2O | K 2O | Cr 2O 3 | Binding |
| 1 | 66％ | 8％ | 5％ | 4％ | 1.0％ | 0.50％ | 2.0％ | |
| 2 | 67％ | 9％ | 4％ | 3％ | 1.1％ | 0.40％ | 1.5％ | |
| 3 | 68％ | 10％ | 6％ | 2％ | 1.2％ | 0.30％ | 1.8％ | |
| 4 | 70％ | 7.5％ | 7％ | 2.5％ | 0.8％ | 0.35％ | 2.8％ | |
| 5 | 72％ | 8.6％ | 5.5％ | 1.5％ | 0.6％ | 0.28％ | 1.15％ | Surplus |
| 6 | 74％ | 9.8％ | 7.5％ | 2.6％ | 0.9％ | 0.45％ | 2.6％ | Surplus |
The formulation weight percentage that coating adopts is as follows: SiO
266%; Al
2O
38%; CaO 5%; MgO 4%; Na
2O 1%; K
2O 0.5%; Cr
2O
32%, surplus Na
2SiO
2
Granularity requirements: 75 orders.
Coating processes: after successfully draw from two rollers the Cast Strip, after successfully draw from two rollers the Cast Strip, start the coating spray-coating device both sides, Cast Strip are sprayed, here the thickness of coating is controlled, require coating speed to match with strip speed.
When the Cast Strip pulling rate is 10～30m/min, coating speed 50g/min～100g/min;
When the Cast Strip pulling rate is 30～60m/min, coating speed 80g/min～150g/min;
When the Cast Strip pulling rate is 60～90m/min, coating speed 100g/min～180g/min;
When the Cast Strip pulling rate is 90～120m/min, coating speed 130g/min～200g/min.
The formulation weight percentage that coating adopts is as follows: SiO
267%; Al
2O
39%; CaO 4%; MgO 3%; Na
2O 1.1%; K
2O 0.4%; Cr
2O
31.5%, the surplus silica.
Granularity requirements: 80 orders
Coating processes: after successfully draw from two rollers the Cast Strip, after successfully draw from two rollers the Cast Strip, start the coating spray-coating device both sides, Cast Strip are sprayed, here the thickness of coating is controlled, require coating speed to match with strip speed.
When the Cast Strip pulling rate is 10～30m/min, coating speed 50g/min～100g/min;
When the Cast Strip pulling rate is 30～60m/min, coating speed 80g/min～150g/min;
When the Cast Strip pulling rate is 60～90m/min, coating speed 100g/min～180g/min;
When the Cast Strip pulling rate is 90～120m/min, coating speed 130g/min～200g/min.
The formulation weight percentage that coating adopts is as follows: SiO
268%; Al
2O
310%; CaO 6%; MgO 2%; Na
2O 1.2%; K
2O 0.3%; Cr
2O
31.8%, the surplus clay.
Granularity requirements: 80 orders
Coating processes: after successfully draw from two rollers the Cast Strip, after successfully draw from two rollers the Cast Strip, start the coating spray-coating device both sides, Cast Strip are sprayed, here the thickness of coating is controlled, require coating speed to match with strip speed.
When the Cast Strip pulling rate is 10～30m/min, coating speed 50g/min～100g/min;
When the Cast Strip pulling rate is 30～60m/min, coating speed 80g/min～150g/min;
When the Cast Strip pulling rate is 60～90m/min, coating speed 100g/min～180g/min;
When the Cast Strip pulling rate is 90～120m/min, coating speed 130g/min～200g/min.
Strip continuous casting technology is one of the most competitive technology of 21 reality, and therefore the advantage from the convenience such as energy savings, environmental protection have conventional continuous casting not compare receives the energetically concern of countries in the world; And casting strip quality also is to affect one of strip success key factor, by the generation of control iron scale, will greatly reduce the mass defect that iron scale brings in the removing of follow-up surface and the curly course.
Claims (5)
1. the anti-oxidation iron sheet of a thin strap continuous casting generation method comprises the steps:
1) smelt, to required composition, it is to be poured to tap with smelting molten steel;
2) cast, molten steel be through ladle, tundish, enters in the airtight molten bath that the crystallization roll by High Rotation Speed forms cooling and the slight rolling formation Cast Strip of process crystallization roll through submersed nozzle or current distribution device;
3) inoxidzable coating applies, and to going out the Cast Strip surface spraying inoxidzable coating of crystallization roll, inoxidzable coating composition percentage by weight is: SiO
260～75%, Al
2O
37～10%, CaO 3～8%, and MgO 1～4%, Na
2O 0.2～1.2%, K
2O 0.1～0.5%, Cr
2O
31.2～3%, the surplus binding agent; Cast Strip pulling rate 10～120m/min, coated weight 50g/min～200g/min, coating layer thickness are controlled at 20～140 μ m;
4) inoxidzable coating is removed, and the Cast Strip is after process spray water-cooled, and the Cast Strip temperature reduces, and inoxidzable coating is cracked, along with high pressure descaling is removed.
2. the anti-oxidation iron sheet of thin strap continuous casting as claimed in claim 1 generation method is characterized in that, binding agent adopts Na
2SiO
2, silica or clay.
3. the anti-oxidation iron sheet of thin strap continuous casting as claimed in claim 1 generation method is characterized in that, as preferentially, and when the Cast Strip pulling rate is 10～30m/min, coated weight 50g/min～100g/min; When the Cast Strip pulling rate is 30～60m/min, coated weight 80g/min～150g/min; When the Cast Strip pulling rate is 60～90m/min, coated weight 100g/min～180g/min; When the Cast Strip pulling rate is 90～120m/min, coated weight 130m/s～200m/s.
4. the inoxidzable coating that generates of the anti-oxidation iron sheet of a thin strap continuous casting, its composition percentage by weight is: SiO
260～75%, Al
2O
37～10%, CaO 3～8%, and MgO 1～4%, Na
2O 0.2～1.2%, K
2O 0.1～0.5%, Cr
2O
31.2～3%, the surplus binding agent.
5. the inoxidzable coating of the anti-oxidation iron sheet generation of thin strap continuous casting as claimed in claim 4 is characterized in that binding agent adopts Na
2SiO
2, silica or clay.
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| CN106552911A (en) * | 2015-09-30 | 2017-04-05 | 宝山钢铁股份有限公司 | Thin strap continuous casting mixes the cleaning plant and method for cleaning of mao roll surface |
| CN111347031A (en) * | 2020-04-02 | 2020-06-30 | 江苏沙钢集团有限公司 | Dam weir type transition ladle for thin strip continuous casting |
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| CN114101612A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Preparation method of jet-cast high-performance 7XXX aluminum alloy thin strip |
| CN115246742A (en) * | 2021-04-28 | 2022-10-28 | 宝山钢铁股份有限公司 | Long nozzle for high-oxygen steel continuous casting |
| CN115246742B (en) * | 2021-04-28 | 2023-09-12 | 宝山钢铁股份有限公司 | Long nozzle for high oxygen steel continuous casting |
| CN114874648A (en) * | 2022-03-30 | 2022-08-09 | 日照钢铁控股集团有限公司 | Surface coating agent used on continuous casting and rolling production line |
| CN114874648B (en) * | 2022-03-30 | 2024-03-12 | 日照钢铁控股集团有限公司 | Surface coating agent used on basis of continuous casting and rolling production line |
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