CN104772441A - Continuous casting powder for high-carbon high-alloy steel - Google Patents
Continuous casting powder for high-carbon high-alloy steel Download PDFInfo
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- CN104772441A CN104772441A CN201410011071.1A CN201410011071A CN104772441A CN 104772441 A CN104772441 A CN 104772441A CN 201410011071 A CN201410011071 A CN 201410011071A CN 104772441 A CN104772441 A CN 104772441A
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- covering slag
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Abstract
The invention discloses continuous casting powder for high-carbon high-alloy steel. The continuous casting powder is formed by mixing a base body and a carbon material accounting for 1-4% of the total weight of the base body, wherein the base body comprises the following components in percentage by weight: 8-16% of Na2O, 0.5-5% of MgO, 8-15% of F, 0-10% of MnO, 3-10% of B2O3, 0.5-5% of Al2O3, 0-3% of Li2O, less than 2% of impurity, and the balance of CaO and SiO2, wherein the weight ratio of the CaO/SiO2 is 1.0-1.3; and the base body meets the following conditions: the proportion of a pre-melting material is not less than 50%, the melting point of the base body is 850-950 DEG C and the viscosity is 0.02-0.1 Pa.s at the temperature of 1300 DEG C. The continuous casting powder has a certain crystallization capacity at the conditions of lower melting point and the lower viscosity, and the defects of slag inclusion and longitudinal cracks of the surface of a casting blank during the continuous casting process of the high-carbon high-alloy steel with the carbon content higher than 1% are overcome.
Description
Technical field
The present invention relates to a kind of steel-making continuous casting auxiliary material, particularly relate to the high-carbon high-alloy steel continuous casting covering slag of a kind of carbon content more than 1%.
Background technology
Continuous casting covering slag is a kind of Powdered or fine granularity steel-making auxiliary material; for covering the molten steel surface in conticaster crystallizer; under the high temperature action of molten steel; covering slag is that solid-liquid is two-layer; adjacent molten steel be melting layer; above melting layer, covering slag still keeps primary granule or powdered form, thus plays good adiabatic heat-insulation effect, solidifies to prevent molten steel surface.Melting layer is under the effect of crystallizer periodic vibration, can continuously flow into again in the gap of copper plate of crystallizer and molten steel initial solidification shell, lubrication base shell and copper coin relative motion, thus ensure the surface quality that strand is good, melting layer also has the nonmetal inclusion absorbing and float in molten steel in addition, the effect of purify hot metal, the flux film flowing into copper plate of crystallizer and base shell gap only has 1 ~ 2mm usually, close copper coin side is solid phase, close base shell side is still liquid phase, liquid phase lubricate, solid phase then can well crystallization control device copper coin to the cooling capacity of base shell, thus regulate the cooldown rate of molten steel, reach the effect of Heat Transfer Control.Therefore covering slag is last one technology that steelmaking process controls cc billet surface quality, the unfavorable covering slag of performance, and strand can be caused to produce the blemish such as slag inclusion, crackle, and serious even causes base shell to tear thus cause bleed-out accident.Therefore, covering slag is the important means ensureing continuous casting process direct motion and cc billet surface quality.
Usual covering slag is with CaO, SiO
2binary is main, joins CaF outward
2, Na
2o, Li
2the fluxs such as O, and a small amount of Al
2o
3, the constituent element such as MgO, MnO, FeO, thus reach suitable fusion temperature and viscosity.Because the fusing point of covering slag is low 400 ~ 500 DEG C for liquid steel temperature, therefore, for the covering slag controlling relative low melting point can slowly melt at molten steel surface, also a certain amount of carbonaceous material must be allocated into, as carbon black and graphite.Carbonaceous material, owing to having very high fusing point, effectively can stop the gathering of covering slag drop, thus has delayed the burn-off rate of covering slag; And carbonaceous material can burn completely again and becomes gas, covering slag is not polluted.
High-carbon steel generally refers to the steel grade of C content more than 0.3%; the feature of this kind of steel grade is that liquidus temperature is low; poor fluidity; the initial solidification shell that molten steel is formed in crystallizer shrinks little; covering slag flow channel narrows; cause melt cinder to flow into difficulty, thus it is uneven easily to cause copper plate of crystallizer heat transfer, easily produces base shell bonding phenomenon.For common high-carbon low-alloy steel (C content <1%); liquidus temperature is at about 1450 ~ 1500 DEG C; conventional covering slag is as described in patent CN102335731A, CN101733377A, JP2011036889, KR20020044234, KR960015799, and concrete composition is in table 1.
Table 1 existing patent high-carbon steel covering slag composition range
Low melting point, low viscosity covering slag that these patents are all continuous casting characteristic for high-carbon steel and develop, fusing point is at 950 ~ 1000 DEG C, and viscosity is at about 0.1Pa.s (i.e. 1.0 pools).These covering slags are mainly suitable for the high-carbon steel of C content within 1.0%.
Along with the raising day by day that development and the user of metallurgical technology require, iron and steel new product is also in continuous renewal.For high-carbon steel; carbon content is also more and more higher; and mostly go back the alloys such as Cr, Mo, V of adjoint high level; for the high-carbon high-alloy product made from steel of these carbon contents more than 1%; the liquidus temperature of molten steel is lower, usually near 1400 DEG C, and traditional high-carbon steel covering slag problem that in use still showing as slag is bad, consumption is not enough; and then have influence on the surface quality of strand, produce the defect such as slag inclusion, lobe.For this reason, for these steel grades, novel applicability covering slag must be developed, to meet need of production.
Summary of the invention
The object of the present invention is to provide a kind of high-carbon high-alloy steel continuous casting covering slag; this covering slag possesses certain crystallization ability under low melting point, low viscous condition, can eliminate the defect such as casting billet surface slag inclusion, lobe that high-carbon high-alloy steel occurs in casting process.
In order to realize above-mentioned technical purpose, the present invention adopts following technical scheme:
A kind of high-carbon high-alloy steel continuous casting covering slag, mixes by matrix with relative to the carbonaceous material of matrix gross weight 1 ~ 4%; Described matrix composition is by weight percentage: Na
2o 8 ~ 16%, MgO 0.5 ~ 5%, F 8-15%, MnO 0 ~ 10%, B
2o
33 ~ 10%, Al
2o
30.5 ~ 5%, Li
2o 0 ~ 3%, and content is no more than the impurity of 2%, all the other are CaO and SiO
2, CaO/SiO
2weight ratio is 1.0 ~ 1.3; Described matrix meets: fritting material accounting example is not less than 50%.
Described matrix fusing point 850 ~ 950 DEG C, 1300 DEG C of viscosity 0.02 ~ 0.1Pa.s.
A kind of method for the preparation of above-mentioned high-carbon high-alloy steel continuous casting covering slag; all raw material mixing of matrix will be used for according to the final required composition of matrix; fritting; obtain fritting material; then continue to add raw material to this fritting material, obtain the matrix with required composition, then in this matrix, add carbonaceous material and mix; then spraying dry is carried out, thus obtained described high-carbon high-alloy steel continuous casting covering slag.
In the process of above-mentioned fritting process, various raw material is while melting, can due to reason generation losses in various degree such as distillation, evaporations, actual composition and gross weight and the target of required matrix of the material (being called fritting material in the present invention) causing this fritting process to obtain form compares with target weight (namely initially adding the gross weight of the various raw materials of this fritting treatment process according to stoichiometric proportion) deviation existing and caused by above-mentioned loss.Therefore need subsequently to continue to add corresponding raw material according to the actual composition of this fritting material and weight, to obtain the matrix of the present invention with target composition and target weight.Described " fritting material accounting example is not less than 50% " namely refers to that the gross weight of this fritting material and the weight ratio of target weight are not less than 50%, and in other words, the gross weight of the various raw materials lost in described fritting processing procedure is less than 50% of this target weight.
The present invention is a kind of high-carbon high-alloy steel sheet billet continuous casting covering slag, and its composition is primarily of CaO, SiO
2composition, joins a certain amount of fluoride, soda ash, B outward
2o
3deng flux and a small amount of MnO, Al
2o
3, MgO.For ensureing the uniformity of covering slag rapid melting and fusing; after these covering slag raw materials mix by a certain percentage; fritting process need be carried out in advance; so; owing to defining complicated solid solution between each material, each melting point substance is reached unanimity, the molten temperature region of covering slag; namely melt the difference of finishing temperature and fusing beginning temperature, just can control in narrower scope.Covering slag after fritting need be finely tuned according to composition tolerances, and fritting material proportion lower than 50%, must not allocate the carbonaceous materials such as appropriate carbon black, graphite into simultaneously.Operation is added/finely tuned to fritting operation and composition is subsequently all operating procedure well known in the art, the mode of any appropriate known in the art can be adopted carry out, as long as required final goal composition can be obtained, and meet fritting material ratio and be not less than 50%.
In covering slag of the present invention, Na
2o is modal a kind of flux in covering slag, effectively can reduce fusing point and the viscosity of covering slag, and for low melting point, the low viscosity characteristics of the claimed slag of high-carbon steel, be absolutely necessary constituent element.Content controls 8 ~ 16%, fusing point can not be reduced to suitable temperature range, Na in addition lower than 8%
2the existence of O also can promote sodium silicoglaserite (Na
2oCaOSiO
2), nepheline (Na
2oAl
2o
32SiO
2) etc. the precipitation of crystal, after its content is more than 16%, crystal amount of precipitation is excessive, and fusing point and viscosity, on the contrary in the trend risen, are unfavorable for the lubrication of melt cinder to strand.Crystallization is excessively strong in addition, and cause slag film resistance too high, molten steel shell growth is excessively slow, is also unfavorable for the raising of casting machine pulling rate, affects the output of steel mill.
F is another kind of common flux in covering slag, and be mainly used to reduce viscosity, F also suitably can reduce fusing point in addition.In addition, cuspidine (3CaO2SiO in F or covering slag
2caF
2) important composition, cuspidine is the most effective crystal controlling slag film resistance, regulate Billet ability.For the present invention, the content of F controls 8 ~ 15% best, lower than 8%, viscosity can not be reduced to effective range, excessively rare more than 15% slag, excessively rare slag is very serious to the erosion of continuous casting tundish submerged nozzle, and the reduction mouth of a river life-span affects rhythm of production equally.
Although Na
2o, F are fluxs, but excessive adding due to corresponding crystal can be separated out, cause the disabler of falling fusing point, viscosity.For this reason, in order to realize the object reducing fusing point, viscosity further, B
2o
3essential, B
2o
3fusing point only have about 450 DEG C, and B
2o
3the precipitation of above-mentioned crystal can be destroyed, therefore B in the present invention
2o
3addition be 3 ~ 10%, within the scope of this, not only effectively can control fusing point and the viscosity of slag, and the excessive precipitation of crystal can be suppressed.
The basicity that covering slag of the present invention requires, i.e. CaO/SiO
2, control between 1.0 ~ 1.3, in covering slag, all crystals is all relevant to these two kinds of basic constituent elements, because high-carbon steel shrinks little in process of setting, therefore slag must accomplish low melting point, low viscosity just can meet the requirements of consumption, but easily there is Longitudinal Surface Cracks problem again in high-carbon high-alloy steel simultaneously, therefore covering slag is in low melting point, certain crystallization ability must be possessed under low viscous condition, thus ensure that flowing into the slag film formed between copper plate of crystallizer and initial solidification shell gap has higher thermal resistance, by the Slow cooling to base shell, realize even solidification, prevent stress from concentrating the object producing lobe.Typically, basicity is greater than the precipitation that 1 is conducive to crystal, but the too high fusing point that causes of basicity sharply increases, and considers, and its scope is best between 1.0 ~ 1.3.
MnO is a kind of transition element oxide, and its existence reduces the transparency of slag, and the width being conducive to reducing molten steel penetrates heat transfer, is therefore also effective constituent element of Heat Transfer Control.MnO also has a certain impact to the performance such as crystallization, fusing point in addition, and along with the increase of content, fusing point is reduction trend, and crystallization is increase trend, and therefore MnO is also used to the effective means regulating Slag Properties.For the present invention addition control within 10% suitable.
Li
2o obviously can reduce fusing point and the viscosity of covering slag, but it is expensive, and be more than 20 times of the fluorite interpolation form of F (in the slag), excessive interpolation can significantly improve the cost of material of covering slag, is unfavorable for commercial Application, therefore Li
2o assists flux usually used as one, can suitably add when fusing point, viscosity are higher, considers no more than 3% from cost angle.
Al
2o
3be impurity constituent element common in covering slag raw material, its existence can improve the viscosity of covering slag, reduces the amount of precipitation of crystal, wishes that content is as far as possible low for the present invention, controls to realize than being easier within 5% under the condition not increasing cost of material.
A small amount of MgO can play the effect reducing viscosity coefficient of dross; but MgO is a kind of high-melting-point substances, along with the further raising of its content, due to the precipitation of corresponding high-melting-point crystal; cause the fusing point of covering slag to raise gradually, therefore its content controls to play the effect of learning from other's strong points to offset one's weaknesses within 5%.
Because covering slag fusing point is lower than molten steel about 400 DEG C, for Control protection slag keeps certain slag layer thickness (can play the effect of adiabatic heat-insulation) at the stably fused of molten steel surface, carbonaceous material is essential.Because carbon is a kind of high-melting-point substances, can prevent the covering slag droplet melted from assembling; Become gas after carbon burning in addition, can not pollute covering slag again.For high-carbon high-alloy steel sheet billet continuous casting covering slag, the addition of carbon is proper 1 ~ 4%.
Covering slag physical property of the present invention shows as fusing point between 850 ~ 950 DEG C; 1300 DEG C of viscosity are 0.03 ~ 0.1Pa.s, can meet completely in production and application process C content more than 1.0%, alloy content 5 ~ 15% the continuous casting production requirement of high-carbon high-alloy steel.
Covering slag of the present invention is used for high-carbon high-alloy steel sheet billet continuous casting technique; the strand that production surface quality is qualified under the normal work pulling rate condition of 0.6 ~ 1.2m/min can be realized; when eliminating the common high-carbon steel covering slag of use, the problem such as Surface inclusion, lobe produced because the bad lubricant effect caused of change slag is not enough.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described.
Covering slag raw material (but being not limited thereto): lime stone, quartz, wollastonite, glass, fluorite, ice crystal, magnesia, bauxite, soda ash, manganese carbonate, pigment manganese, lithium carbonate, lithium concentrate, borax, boron calcium ore deposit etc.
Above-mentioned raw materials is worn into fine powder, after covering slag matrix composition (i.e. target component) Homogeneous phase mixing, first carry out fritting process, make to form complicated solid solution between each material, discharge the volatile matter such as carbonate and moisture simultaneously, obtain burn-off rate faster evenly fritting material, the fine powder that particle diameter is less than 0.075mm is again ground to form after cooling fragmentation, add above-mentioned raw materials according to concrete deviation to finely tune, to obtain the matrix with target composition and target weight, wherein the ratio of fritting material and target weight is not less than 50%, allocate appropriate carbon black on request into afterwards, the carbonaceous materials such as graphite, carry out mechanical mixture, or obtain granular pattern finished product protection slag by spray drying device.
Target component and the performance of comparative example and embodiment see the following form.
Claims (3)
1. a high-carbon high-alloy steel continuous casting covering slag, is characterized in that: mix by matrix with relative to the carbonaceous material of matrix gross weight 1 ~ 4%;
Described matrix composition is by weight percentage: Na
2o 8 ~ 16%, MgO 0.5 ~ 5%, F 8-15%, MnO 0 ~ 10%, B
2o
33 ~ 10%, Al
2o
30.5 ~ 5%, Li
2o 0 ~ 3%, and content is no more than the impurity of 2%, all the other are CaO and SiO
2, CaO/SiO
2weight ratio is 1.0 ~ 1.3;
Described matrix meets: fritting material accounting example is not less than 50%.
2. high-carbon high-alloy steel continuous casting covering slag according to claim 1, is characterized in that: described matrix fusing point 850 ~ 950 DEG C, 1300 DEG C of viscosity 0.02 ~ 0.1Pa.s.
3. the method for the preparation of high-carbon high-alloy steel continuous casting covering slag as claimed in claim 1 or 2; it is characterized in that: will all raw material mixing of matrix be used for according to the final required composition of matrix; fritting; obtain fritting material; then continue to add raw material to this fritting material, obtain the matrix with required composition, then in this matrix, add carbonaceous material and mix; then spraying dry is carried out, thus obtained described high-carbon high-alloy steel continuous casting covering slag.
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|---|---|---|---|
| CN201410011071.1A CN104772441A (en) | 2014-01-10 | 2014-01-10 | Continuous casting powder for high-carbon high-alloy steel |
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| CN201410011071.1A CN104772441A (en) | 2014-01-10 | 2014-01-10 | Continuous casting powder for high-carbon high-alloy steel |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105772652A (en) * | 2016-03-23 | 2016-07-20 | 河南省西保冶材集团有限公司 | Special cleaner for molten iron ladle furnace liner and using method thereof |
| CN108115103A (en) * | 2016-11-30 | 2018-06-05 | 宝山钢铁股份有限公司 | For the continuous casting covering slag of high-aluminum steel and its crystallization rate detection method |
| CN110315040A (en) * | 2019-08-20 | 2019-10-11 | 西峡县恒基冶材有限公司 | A kind of high titanium abrasion-resistant stee continuous crystallizer protecting slag of high-carbon |
| CN110616296A (en) * | 2019-10-30 | 2019-12-27 | 江阴华润制钢有限公司 | Method for producing high-carbon high-alloy ledeburite steel by arc continuous casting |
| CN110976797A (en) * | 2019-12-25 | 2020-04-10 | 河南通宇冶材集团有限公司 | Micro-carbon covering slag for medium-high carbon steel of square and rectangular billets and preparation method thereof |
| CN111496202A (en) * | 2020-05-26 | 2020-08-07 | 武汉钢铁有限公司 | Method for preventing continuous casting, casting and bonding breakout |
| CN113305274A (en) * | 2020-02-26 | 2021-08-27 | 宝山钢铁股份有限公司 | Medium carbon steel covering slag for continuous casting of wide and thick plates |
| CN115584438A (en) * | 2022-10-10 | 2023-01-10 | 湖南华菱涟源钢铁有限公司 | Ultrahigh carbon steel plate and manufacturing method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105772652A (en) * | 2016-03-23 | 2016-07-20 | 河南省西保冶材集团有限公司 | Special cleaner for molten iron ladle furnace liner and using method thereof |
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| CN110315040B (en) * | 2019-08-20 | 2021-07-09 | 西峡县恒基冶材有限公司 | Continuous casting crystallizer casting powder for high-carbon high-titanium wear-resistant steel |
| CN110616296A (en) * | 2019-10-30 | 2019-12-27 | 江阴华润制钢有限公司 | Method for producing high-carbon high-alloy ledeburite steel by arc continuous casting |
| CN110616296B (en) * | 2019-10-30 | 2021-06-22 | 江阴华润制钢有限公司 | Method for producing high-carbon high-alloy ledeburite steel by arc continuous casting |
| CN110976797A (en) * | 2019-12-25 | 2020-04-10 | 河南通宇冶材集团有限公司 | Micro-carbon covering slag for medium-high carbon steel of square and rectangular billets and preparation method thereof |
| CN110976797B (en) * | 2019-12-25 | 2022-06-07 | 河南通宇冶材集团有限公司 | Micro-carbon covering slag for medium-high carbon steel of square and rectangular billets and preparation method thereof |
| CN113305274A (en) * | 2020-02-26 | 2021-08-27 | 宝山钢铁股份有限公司 | Medium carbon steel covering slag for continuous casting of wide and thick plates |
| CN111496202A (en) * | 2020-05-26 | 2020-08-07 | 武汉钢铁有限公司 | Method for preventing continuous casting, casting and bonding breakout |
| CN115584438A (en) * | 2022-10-10 | 2023-01-10 | 湖南华菱涟源钢铁有限公司 | Ultrahigh carbon steel plate and manufacturing method thereof |
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Application publication date: 20150715 |