CN104624997A - Continuous casting mold flux for boron containing steel - Google Patents
Continuous casting mold flux for boron containing steel Download PDFInfo
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- CN104624997A CN104624997A CN201510095673.4A CN201510095673A CN104624997A CN 104624997 A CN104624997 A CN 104624997A CN 201510095673 A CN201510095673 A CN 201510095673A CN 104624997 A CN104624997 A CN 104624997A
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- containing steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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Abstract
The invention belongs to the technical field of auxiliary materials for metal smelting and relates to continuous casting mold flux for boron containing steel. The continuous casting mold flux for the boron containing steel is prepared from, by weight, 3-7 parts of glass powder, 40-55 parts of premelting materials, 27-35 parts of aedelforsite, 2 parts of carbon black, 4-5 parts of graphite, 5-9 parts of sodium carbonate, 2.5-5.5 parts of sodium fluoride, 2-4 parts of bauxite, 2-5 parts of caustic calcined magnesite, 5-8 parts of boron carbide and 1.2 parts of binding agent. For crack sensitivity of the boron containing steel, selection, basicity, viscosity and melting point of raw materials of the continuous casting mold flux are controlled comprehensively, so that crack sensitivity of the boron containing steel is improved effectively, and the problems of cracks at edges of the surface of the boron containing steel is solved.
Description
Technical field
The invention belongs to metal smelt auxiliary material technical field, be specifically related to a kind of boron-containing steel continuous crystallizer protecting slag.
Background technology
Boron-containing steel refers to the steel containing a certain amount of boron, and wherein the content of boron is 0.001%-0.003%.
China's boron aboundresources, and in molten steel, add a small amount of boron the quenching degree of steel just can be made to increase, also can replace the noble elements such as Mo, Cr, Ti simultaneously, economize on resources.Meanwhile, special steel outlet etc. in enjoy have certain refund advantage, so boron steel now become domestic steel industry put forth effort develop steel grade.
Boron-containing steel has higher quenching degree and fatigue resistance due to it, existing main as structural steel.In addition, can also as multiple uses such as spring steel, cold-shaping steel, abrasion-resistant stee and atomic energy steel.The application of boron steel will constantly expand along with the development of high-purity smelting technique.
But the crack sensitivity of boron-containing steel is comparatively strong, the minor variations of Boron contents will cause steel billet to produce larger defect, and as strand edge cracks etc., this also becomes a huge bottleneck of restriction domestic steel industry development boron-containing steel.
Boron-containing steel has stronger quenching degree compared with carbon steel, but what produce advantageous effect in boron steel is not boron element total amount, but solid solution boron amount in steel.Because the chemical property of boron element is extremely active, be easy to the oxygen in molten steel, nitrogen is combined, boron nitride and the boron oxide of reaction generation can reduce the effect of boron element in molten steel.And Boron contents in molten steel is few, so how stably to obtain appropriate solid solution boron and uniform distribution is very important in the smelting process of boron steel.Research shows, the affinity of boron element and oxygen element is better than manganese and is weaker than aluminium, close with silicon; The affinity of boron element and nitrogen element is better than aluminium and is weaker than titanium.Therefore, in the continuous casting production process of reality, usually adopt the method for aluminium deoxidation, titanium fixed nitrogen, to ensure to obtain good boron alloyed effect.
Summary of the invention
Technical problem to be solved by this invention is, for the deficiencies in the prior art, provides a kind of boron-containing steel continuous crystallizer protecting slag, effectively solves the surperficial edge crack problem of boron-containing steel, to improve the combination property of boron-containing steel.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
A kind of boron-containing steel continuous crystallizer protecting slag, is made up of the raw material of following weight parts: 3 ~ 7 parts, glass dust, pre-melt 40 ~ 55 parts, wollastonite 27 ~ 35 parts, carbon black 2 parts, 4 ~ 5 parts, graphite, 5 ~ 9 parts, sodium carbonate, sodium fluoride 2.5 ~ 5.5 parts, bauxite 2 ~ 4 parts, caustic-calcined magnesite 2 ~ 5 parts, boron carbide 5 ~ 8 parts, 1.2 parts, adhesive.
Further; described boron-containing steel continuous crystallizer protecting slag, is made up of the raw material of following weight parts: 4 ~ 5 parts, glass dust, pre-melt 45 ~ 50 parts, wollastonite 27 ~ 29 parts, carbon black 2 parts, 4 ~ 5 parts, graphite, 5 ~ 7 parts, sodium carbonate, sodium fluoride 3 ~ 4 parts, bauxite 2.5 ~ 3.5 parts, caustic-calcined magnesite 2 ~ 3 parts, boron carbide 5 ~ 6 parts, 1.2 parts, adhesive.
Further; described boron-containing steel continuous crystallizer protecting slag, is made up of the raw material of following weight parts: 4 parts, glass dust, pre-melt 48 parts, wollastonite 28 parts, carbon black 2 parts, 4 parts, graphite, 6 parts, sodium carbonate, sodium fluoride 3.5 parts, bauxite 3.5 parts, caustic-calcined magnesite 2.5 parts, boron carbide 5.5 parts, 1.2 parts, adhesive.
Further, the basicity CaO/SiO of described boron-containing steel continuous crystallizer protecting slag
2be 1.1 ~ 1.2.
Further, the fusing point of described boron-containing steel continuous crystallizer protecting slag is 1030 ~ 1090 DEG C.
Further, the viscosity of described boron-containing steel continuous crystallizer protecting slag at 1300 DEG C is 0.40 ~ 0.44Pas.
Preferably, the composition of described pre-melt and percentage by weight consist of: SiO
242 ~ 45%, CaO36 ~ 39%, MgO1.5 ~ 3.5%, Fe
2o
3be not more than 1%, Al
2o
34 ~ 6%, Na
2o5 ~ 7%, F2 ~ 4%.
Beneficial effect of the present invention is as follows:
Boron-containing steel continuous crystallizer protecting slag of the present invention is according to the characteristic of boracic steel grade; for effectively solving boron-containing steel surface edge crack problem; adopt glass dust, pre-these raw materials of melt, wollastonite, carbon black, graphite, sodium carbonate, sodium fluoride, bauxite, caustic-calcined magnesite, boron carbide and adhesive, make through a series of process such as mixing, defibrination, mist projection granulatings.The characteristic of covering slag depends primarily on the composition of covering slag, the relation research of covering slag composition transitivity is subject to for a long time always to the attention of metallurgy industry.The composition of covering slag depends on choosing of covering slag raw material, and mold flux property is mutual synergistic direct embodiment between various raw material, therefore choosing the combination property of covering slag of covering slag raw material is most important.The present invention adopts the pre-melted type covering slag with good pre-arcing characterisitics, thus improves the stability of covering slag performance.
Secondly, the present invention is directed to the defect that crackle easily appears in boron-containing steel in casting process, by basicity and the viscosity of Control protection slag, make the basicity CaO/SiO of covering slag
2be 1.1 ~ 1.2; viscosity at 1300 DEG C is 0.4 ~ 0.44Pa.s, makes covering slag while having better heat-transfer effect, also has good greasy property; thus prevent the generation of boron-containing steel face crack, also overcome the defect that conventional high alkalinity covering slag easily increases strand frictional force simultaneously.Between strand and crystallizer, the good control of horizontal heat transfer can avoid the generation of longitudinal crack, and longitudinally conducts heat and can affect depth of chatter mark, the formation of pin hole, melt cinder to the filling of passage between crystallizer and strand and lubrication etc.The realization of the above-mentioned performance of covering slag is mutual synergistic result between each raw material, because the composition of each raw material and the reasonable of proportioning are with suitable, just make mold flux property embody better, thus the quality of boron-containing steel is better ensured.
Usually, the boron in boron-containing steel easily and O, N residual in molten steel combine, generation boron oxide and boron nitride, boron nitride can precipitate in crystal boundary, can reduce the mobility of crystal boundary after boron nitride continuous precipitation, and crystallization temperature is raised; Simultaneously because crystal boundary can not move, stress is assembled at grain boundaries, thus causes crack sensitivity to increase.Therefore, covering slag of the present invention by the selection of suitable raw material type and proportioning, by covering slag fusing point control at 1030 DEG C ~ 1090 DEG C, thus improve heat transfer property and the lubrication of covering slag.
And what play a major role in boron steel is admittedly molten boron amount in boron steel, and boron is a kind of more active element, easily with the element such as O, N reacts, make boron ineffective.Therefore add a certain amount of boron carbide in covering slag of the present invention; covering slag is made constantly to discharge boron element in casting process; composition in join protection slag and proportioning; make the boron alloy effect that molten steel reaches best; thus stably obtain appropriate solid solution boron; and boron is distributed uniformly, improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel, avoid the generation of the surperficial edge cracks of boron-containing steel.In addition, boron element has stronger dyeing and shielding action, adds a certain amount of boron element and also can prevent strand heat losses in covering slag; improve strand total amount of heat; improve the heat-insulating property of covering slag, be conducive to improving strand lubrication, avoid the generation of strand crackle.
Adopt boron-containing steel continuous crystallizer protecting slag of the present invention for the boron-containing steel continuous casting of certain factory; can observe covering slag crystallizer internal mobility and spreadability good; fusing evenly; can uniform fold molten steel face; the top of the slag, without clustering phenomena, ensure that the sufficient lubrication of strand simultaneously, and the crackle of gained strand obviously reduces; the probability that strand cracks occurs, lower than 0.30%, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
The present invention is directed to the crack-sensitivity sex chromosome mosaicism of boron-containing steel, the choosing of its continuous crystallizer protecting slag raw material, basicity, viscosity and fusing point are carried out to Comprehensive Control, thus effectively improve the crack sensitivity of boron-containing steel, solves the surperficial edge crack problem of boron-containing steel.
Detailed description of the invention
In order to illustrate further in more detail instead of limit the present invention, provide the following example.
Embodiment one
For the boron-containing steel continuous crystallizer protecting slag that A factory produces, be made up of the raw material of following weight parts: 4 parts, glass dust, pre-melt 48 parts, wollastonite 28 parts, carbon black 2 parts, 4 parts, graphite, 6 parts, sodium carbonate, sodium fluoride 3.5 parts, bauxite 3.5 parts, caustic-calcined magnesite 2.5 parts, boron carbide 5.5 parts, 1.2 parts, adhesive.
Wherein, the composition of the present invention's pre-melt used and percentage by weight consist of: SiO
242 ~ 45%, CaO36 ~ 39%, MgO1.5 ~ 3.5%, Fe
2o
3be not more than 1%, Al
2o
34 ~ 6%, Na
2o5 ~ 7%, F2 ~ 4%.In addition, adhesive can adopt this area traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: basicity CaO/SiO
2be 1.14, fusing point is 1065 DEG C, and the viscosity at 1300 DEG C is 0.40Pas.
Adopt the crackle of covering slag gained strand of the present invention obviously to reduce, the probability that strand cracks occurs lower than 0.12%, and without surperficial edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
Embodiment two
For the boron-containing steel continuous crystallizer protecting slag that B factory produces, be made up of the raw material of following weight parts: 4 parts, glass dust, pre-melt 45 parts, wollastonite 29 parts, carbon black 2 parts, 4 parts, graphite, 7 parts, sodium carbonate, sodium fluoride 3 parts, bauxite 2.5 parts, caustic-calcined magnesite 3 parts, boron carbide 5 parts, 1.2 parts, adhesive.
Wherein, the composition of the present invention's pre-melt used and percentage by weight consist of: SiO
242 ~ 45%, CaO36 ~ 39%, MgO1.5 ~ 3.5%, Fe
2o
3be not more than 1%, Al
2o
34 ~ 6%, Na
2o5 ~ 7%, F2 ~ 4%.In addition, adhesive can adopt this area traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: basicity CaO/SiO
2be 1.12, fusing point is 1045 DEG C, and the viscosity at 1300 DEG C is 0.42Pas.
Adopt the crackle of covering slag gained strand of the present invention obviously to reduce, the probability that strand cracks occurs lower than 0.15%, and without surperficial edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
Embodiment three
For the boron-containing steel continuous crystallizer protecting slag that C factory produces, be made up of the raw material of following weight parts: 5 parts, glass dust, pre-melt 50 parts, wollastonite 27 parts, carbon black 2 parts, 5 parts, graphite, 5 parts, sodium carbonate, sodium fluoride 4 parts, bauxite 3.5 parts, caustic-calcined magnesite 2 parts, boron carbide 6 parts, 1.2 parts, adhesive.
Wherein, the composition of the present invention's pre-melt used and percentage by weight consist of: SiO
242 ~ 45%, CaO36 ~ 39%, MgO1.5 ~ 3.5%, Fe
2o
3be not more than 1%, Al
2o
34 ~ 6%, Na
2o5 ~ 7%, F2 ~ 4%.In addition, adhesive can adopt this area traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: basicity CaO/SiO
2be 1.13, fusing point is 1055 DEG C, and the viscosity at 1300 DEG C is 0.41Pas.
Adopt the crackle of covering slag gained strand of the present invention obviously to reduce, the probability that strand cracks occurs lower than 0.18%, and without surperficial edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
Embodiment four
For the boron-containing steel continuous crystallizer protecting slag that D factory produces, be made up of the raw material of following weight parts: 4 parts, glass dust, pre-melt 43.3 parts, wollastonite 29 parts, carbon black 2 parts, 4 parts, graphite, 5 parts, sodium carbonate, sodium fluoride 2.5 parts, bauxite 2 parts, caustic-calcined magnesite 2 parts, boron carbide 5 parts, 1.2 parts, adhesive.
Wherein, the composition of pre-melt of the present invention and percentage by weight consist of: SiO
242 ~ 45%, CaO36 ~ 39%, MgO1.5 ~ 3.5%, Fe
2o
3be not more than 1%, Al
2o
34 ~ 6%, Na
2o5 ~ 7%, F2 ~ 4%.In addition, adhesive can adopt this area traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: basicity CaO/SiO
2be 1.15, fusing point is 1065 DEG C, and the viscosity at 1300 DEG C is 0.43Pas.
Adopt the crackle of covering slag gained strand of the present invention obviously to reduce, the probability that strand cracks occurs lower than 0.25%, and without obvious surperficial edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
Embodiment five
For the boron-containing steel continuous crystallizer protecting slag that E factory produces, be made up of the raw material of following weight parts: 3.5 parts, glass dust, pre-melt 40 parts, wollastonite 28.6 parts, carbon black 2 parts, 4.1 parts, graphite, 5.3 parts, sodium carbonate, sodium fluoride 4.2 parts, bauxite 3.1 parts, caustic-calcined magnesite 3.4 parts, boron carbide 5.6 parts, 1.2 parts, adhesive.
Wherein, the composition of described pre-melt and percentage by weight consist of: SiO
242 ~ 45%, CaO36 ~ 39%, MgO1.5 ~ 3.5%, Fe
2o
3be not more than 1%, Al
2o
34 ~ 6%, Na
2o5 ~ 7%, F2 ~ 4%.In addition, adhesive can adopt the traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: the basicity CaO/SiO of described boron-containing steel continuous crystallizer protecting slag
2be 1.16, fusing point is 1080 DEG C, and the viscosity at 1300 DEG C is 0.43Pas.
Adopt the crackle of covering slag gained strand of the present invention obviously to reduce, the probability that strand cracks occurs lower than 0.23%, and without obvious surperficial edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
Embodiment six
For the boron-containing steel continuous crystallizer protecting slag that F factory produces, be made up of the raw material of following weight parts: 3 parts, glass dust, pre-melt 55 parts, wollastonite 30 parts, carbon black 2 parts, 4.5 parts, graphite, 8 parts, sodium carbonate, sodium fluoride 3 parts, bauxite 2.6 parts, caustic-calcined magnesite 4.2 parts, boron carbide 8 parts, 1.2 parts, adhesive.
Wherein, the composition of described pre-melt and percentage by weight consist of: SiO
242 ~ 45%, CaO36 ~ 39%, MgO1.5 ~ 3.5%, Fe
2o
3be not more than 1%, Al
2o
34 ~ 6%, Na
2o5 ~ 7%, F2 ~ 4%.In addition, adhesive can adopt the traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: the basicity CaO/SiO of described boron-containing steel continuous crystallizer protecting slag
2be 1.10, fusing point is 1030 DEG C, and the viscosity at 1300 DEG C is 0.44Pas.
Adopt the crackle of covering slag gained strand of the present invention obviously to reduce, the probability that strand cracks occurs lower than 0.28%, and without obvious surperficial edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
Embodiment seven
For the boron-containing steel continuous crystallizer protecting slag that G factory produces, be made up of the raw material of following weight parts: 7 parts, glass dust, pre-melt 48 parts, wollastonite 35 parts, carbon black 2 parts, 5 parts, graphite, 9 parts, sodium carbonate, sodium fluoride 5.5 parts, bauxite 2 parts, caustic-calcined magnesite 5 parts, boron carbide 7 parts, 1.2 parts, adhesive.
Wherein, the composition of described pre-melt and percentage by weight consist of: SiO
242 ~ 45%, CaO36 ~ 39%, MgO1.5 ~ 3.5%, Fe
2o
3be not more than 1%, Al
2o
34 ~ 6%, Na
2o5 ~ 7%, F2 ~ 4%.In addition, adhesive can adopt the traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: the basicity CaO/SiO of described boron-containing steel continuous crystallizer protecting slag
2be 1.20, fusing point is 1090 DEG C, and the viscosity at 1300 DEG C is 0.44Pas.
Adopt the crackle of covering slag gained strand of the present invention obviously to reduce, the probability that strand cracks occurs lower than 0.30%, and without obvious surperficial edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
In sum, clearly, all any amendments done according to technical support essence of the present invention and change still belong in the scope that the technology of the present invention supports for every claim that a kind of boron-containing steel of the present invention continuous crystallizer protecting slag is addressed and technical support.
Claims (6)
1. a boron-containing steel continuous crystallizer protecting slag; it is characterized in that: be made up of the raw material of following weight parts, 3 ~ 7 parts, glass dust, pre-melt 40 ~ 55 parts, wollastonite 27 ~ 35 parts, carbon black 2 parts, 4 ~ 5 parts, graphite, 5 ~ 9 parts, sodium carbonate, sodium fluoride 2.5 ~ 5.5 parts, bauxite 2 ~ 4 parts, caustic-calcined magnesite 2 ~ 5 parts, boron carbide 5 ~ 8 parts, 1.2 parts, adhesive.
2. boron-containing steel continuous crystallizer protecting slag as claimed in claim 1; it is characterized in that: described boron-containing steel continuous crystallizer protecting slag, be made up of the raw material of following weight parts: 4 ~ 5 parts, glass dust, pre-melt 45 ~ 50 parts, wollastonite 27 ~ 29 parts, carbon black 2 parts, 4 ~ 5 parts, graphite, 5 ~ 7 parts, sodium carbonate, sodium fluoride 3 ~ 4 parts, bauxite 2.5 ~ 3.5 parts, caustic-calcined magnesite 2 ~ 3 parts, boron carbide 5 ~ 6 parts, 1.2 parts, adhesive.
3. boron-containing steel continuous crystallizer protecting slag as claimed in claim 1; it is characterized in that: described boron-containing steel continuous crystallizer protecting slag, be made up of the raw material of following weight parts: 4 parts, glass dust, pre-melt 48 parts, wollastonite 28 parts, carbon black 2 parts, 4 parts, graphite, 6 parts, sodium carbonate, sodium fluoride 3.5 parts, bauxite 3.5 parts, caustic-calcined magnesite 2.5 parts, boron carbide 5.5 parts, 1.2 parts, adhesive.
4. the boron-containing steel continuous crystallizer protecting slag as described in claim 1 or 2 or 3, is characterized in that: the basicity CaO/SiO of described boron-containing steel continuous crystallizer protecting slag
2be 1.1 ~ 1.2.
5. boron-containing steel continuous crystallizer protecting slag as claimed in claim 4, is characterized in that: the fusing point of described boron-containing steel continuous crystallizer protecting slag is 1030 ~ 1090 DEG C.
6. boron-containing steel continuous crystallizer protecting slag as claimed in claim 5, is characterized in that: the viscosity of described boron-containing steel continuous crystallizer protecting slag at 1300 DEG C is 0.40 ~ 0.44Pas.
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| CN106270429A (en) * | 2015-06-09 | 2017-01-04 | 宝山钢铁股份有限公司 | Hypoergia covering slag and preparation method |
| CN114769533A (en) * | 2022-03-31 | 2022-07-22 | 西峡县西保冶金材料有限公司 | Function protection material for continuous casting crystallizer for industrial pure iron |
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| CN114769533A (en) * | 2022-03-31 | 2022-07-22 | 西峡县西保冶金材料有限公司 | Function protection material for continuous casting crystallizer for industrial pure iron |
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| CN104624997B (en) | 2016-08-24 |
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