CN104624997B - A kind of boron-containing steel continuous crystallizer protecting slag - Google Patents
A kind of boron-containing steel continuous crystallizer protecting slag Download PDFInfo
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- CN104624997B CN104624997B CN201510095673.4A CN201510095673A CN104624997B CN 104624997 B CN104624997 B CN 104624997B CN 201510095673 A CN201510095673 A CN 201510095673A CN 104624997 B CN104624997 B CN 104624997B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- 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 metal smelt auxiliary material technical field.A kind of boron-containing steel continuous crystallizer protecting slag, is made up of the raw material of following weight parts: 3 ~ 7 parts of glass dust, pre-melt 40 ~ 55 parts, wollastonite 27 ~ 35 parts, carbon black 2 parts, 4 ~ 5 parts of graphite, 5 ~ 9 parts of 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 of adhesive.The present invention is directed to the crack-sensitivity sex chromosome mosaicism of boron-containing steel, its continuous crystallizer protecting slag raw material is chosen, basicity, viscosity and fusing point carry out Comprehensive Control, thus be effectively improved the crack sensitivity of boron-containing steel, solve the surface edge crack problem of boron-containing steel.
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, the noble elements such as Mo, Cr, Ti can also be replaced simultaneously, economize on resources.Meanwhile, special steel is enjoyed at aspects such as outlets certain refund advantage, so boron steel has become domestic steel industry and puted forth effort the steel grade of development.
Boron-containing steel has higher quenching degree and fatigue resistance due to it, is now mainly used as structural steel.Further, it is also possible to 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 relatively strong, and the minor variations of Boron contents will cause steel billet to produce bigger defect, and such as strand edge cracks etc., this also becomes the huge bottleneck restricting domestic steel industry development boron-containing steel.
Boron-containing steel has stronger quenching degree compared with carbon steel, but produce advantageous effect in boron steel is not boron element total amount, but solid solution boron amount in steel.Owing to the chemical property of boron element is the most active, it is easy to oxygen, nitrogen in molten steel are combined, the boron nitride that reaction generates and boron oxide can reduce boron element effect in molten steel.And Boron contents in molten steel is few, so the most stably obtaining appropriate solid solution boron in the smelting process of boron steel and uniform distribution is very important.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 actual continuous casting production process, generally use aluminium deoxidation, the method for titanium fixed nitrogen, to ensure to obtain good boron alloyed effect.
Summary of the invention
The technical problem to be solved is, for the deficiencies in the prior art, it is provided that a kind of boron-containing steel continuous crystallizer protecting slag, effectively solves the surface edge crack problem of boron-containing steel, to improve the combination property of boron-containing steel.
For solving above-mentioned technical problem, 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 of glass dust, pre-melt 40 ~ 55 parts, wollastonite 27 ~ 35 parts, carbon black 2 parts, 4 ~ 5 parts of graphite, 5 ~ 9 parts of 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 of adhesive.
Further; described boron-containing steel continuous crystallizer protecting slag, is made up of the raw material of following weight parts: 4 ~ 5 parts of glass dust, pre-melt 45 ~ 50 parts, wollastonite 27 ~ 29 parts, carbon black 2 parts, 4 ~ 5 parts of graphite, 5 ~ 7 parts of 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 of adhesive.
Further; described boron-containing steel continuous crystallizer protecting slag, is made up of the raw material of following weight parts: 4 parts of glass dust, pre-melt 48 parts, wollastonite 28 parts, carbon black 2 parts, 4 parts of graphite, 6 parts of 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 of adhesive.
Further, basicity CaO/SiO of described boron-containing steel continuous crystallizer protecting slag2It is 1.1 ~ 1.2.
Further, the fusing point of described boron-containing steel continuous crystallizer protecting slag is 1030 ~ 1090 DEG C.
Further, described boron-containing steel continuous crystallizer protecting slag viscosity at 1300 DEG C is 0.40 ~ 0.44Pa s.
Preferably, composition and the percentage by weight of described pre-melt consists of: SiO242~45%、CaO36~39%、MgO1.5~3.5%、Fe2O3No more than 1%, Al2O34~6%、Na2O5~7%、F2~4%。
Beneficial effects 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; use glass dust, pre-melt, wollastonite, carbon black, graphite, sodium carbonate, sodium fluoride, bauxite, caustic-calcined magnesite, boron carbide and these raw materials of 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, and the relation research that covering slag forms transitivity is constantly subjected to the attention of metallurgy industry for a long time.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, thus covering slag raw material to choose the combination property to covering slag most important.The present invention uses 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 boron-containing steel and the defect of crackle easily occurs in casting process, by controlling basicity and the viscosity of covering slag, make basicity CaO/SiO of covering slag2It is 1.1 ~ 1.2; viscosity at 1300 DEG C is 0.4 ~ 0.44Pa.s, makes covering slag while having preferable heat-transfer effect, it may have preferably greasy property; thus prevent the generation of boron-containing steel face crack, also overcome conventional high alkalinity covering slag easily increases the defect of strand frictional force simultaneously.The good generation controlling to avoid longitudinal crack of horizontal heat transfer between strand and crystallizer, and longitudinally conduct 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, owing to the composition of each raw material and the reasonable of proportioning are with suitable, just makes mold flux property embody more preferably, so that the quality of boron-containing steel is preferably ensured.
Generally, O, N that the boron in boron-containing steel easily and remains in molten steel combine, and generate boron oxide and boron nitride, and boron nitride can precipitate in crystal boundary, can reduce the mobility of crystal boundary after boron nitride continuous precipitation, make crystallization temperature raise；Simultaneously because crystal boundary can not migrate, stress is assembled at grain boundaries, thus causes crack sensitivity to increase.Therefore, covering slag of the present invention by suitable raw material type and the selection of 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, play a major role in boron steel is the solid solution boron amount in boron steel, and boron is the element that a kind of comparison is active, easily reacts with the element such as O, N, makes boron ineffective.Therefore covering slag of the present invention adds a certain amount of boron carbide; covering slag is made constantly to discharge boron element in casting process; composition in join protection slag and proportioning; molten steel is made to reach best boron alloy effect; thus stably obtain appropriate solid solution boron; and make boron be distributed uniformly, improve the crack-sensitivity sex chromosome mosaicism of boron-containing steel, it is to avoid the generation of the surface edge cracks of boron-containing steel.It addition, boron element has stronger dyeing and shielding action, covering slag adds a certain amount of boron element and is also possible to prevent strand heat losses; improve strand total amount of heat; improve the heat-insulating property of covering slag, be conducive to improving strand lubrication, it is to avoid the generation of strand crackle.
Use the boron-containing steel continuous crystallizer protecting slag boron-containing steel continuous casting for certain factory of the present invention; it is observed that covering slag is good in crystallizer internal mobility and spreadability; fusing is uniformly; can uniform fold molten steel face; the top of the slag, without clustering phenomena, ensure that the sufficient lubrication of strand, the crackle of gained strand significantly reduce simultaneously; the probability that strand cracks occurs, less 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, its continuous crystallizer protecting slag raw material is chosen, basicity, viscosity and fusing point carry out Comprehensive Control, thus be effectively improved the crack sensitivity of boron-containing steel, solve the surface edge crack problem of boron-containing steel.
Detailed description of the invention
In order to be further elucidated with in more detail rather than limit the present invention, provide the following example.
Embodiment one
The boron-containing steel continuous crystallizer protecting slag produced for A factory, is made up of the raw material of following weight parts: 4 parts of glass dust, pre-melt 48 parts, wollastonite 28 parts, carbon black 2 parts, 4 parts of graphite, 6 parts of 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 of adhesive.
Wherein, composition and the percentage by weight of pre-melt used by the present invention consists of: SiO242~45%、CaO36~39%、MgO1.5~3.5%、Fe2O3No more than 1%, Al2O34~6%、Na2O5~7%、F2~4%.Additionally, adhesive can use this area traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: basicity CaO/SiO2Being 1.14, fusing point is 1065 DEG C, and the viscosity at 1300 DEG C is 0.40Pa s.
The crackle using the covering slag gained strand of the present invention significantly reduces, and the probability that strand cracks occurs is less than 0.12%, and without surface edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
Embodiment two
The boron-containing steel continuous crystallizer protecting slag produced for B factory, is made up of the raw material of following weight parts: 4 parts of glass dust, pre-melt 45 parts, wollastonite 29 parts, carbon black 2 parts, 4 parts of graphite, 7 parts of sodium carbonate, sodium fluoride 3 parts, bauxite 2.5 parts, caustic-calcined magnesite 3 parts, boron carbide 5 parts, 1.2 parts of adhesive.
Wherein, composition and the percentage by weight of pre-melt used by the present invention consists of: SiO242~45%、CaO36~39%、MgO1.5~3.5%、Fe2O3No more than 1%, Al2O34~6%、Na2O5~7%、F2~4%.Additionally, adhesive can use this area traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: basicity CaO/SiO2Being 1.12, fusing point is 1045 DEG C, and the viscosity at 1300 DEG C is 0.42Pa s.
The crackle using the covering slag gained strand of the present invention significantly reduces, and the probability that strand cracks occurs is less than 0.15%, and without surface edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
Embodiment three
The boron-containing steel continuous crystallizer protecting slag produced for C factory, is made up of the raw material of following weight parts: 5 parts of glass dust, pre-melt 50 parts, wollastonite 27 parts, carbon black 2 parts, 5 parts of graphite, 5 parts of sodium carbonate, sodium fluoride 4 parts, bauxite 3.5 parts, caustic-calcined magnesite 2 parts, boron carbide 6 parts, 1.2 parts of adhesive.
Wherein, composition and the percentage by weight of pre-melt used by the present invention consists of: SiO242~45%、CaO36~39%、MgO1.5~3.5%、Fe2O3No more than 1%, Al2O34~6%、Na2O5~7%、F2~4%.Additionally, adhesive can use this area traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: basicity CaO/SiO2Being 1.13, fusing point is 1055 DEG C, and the viscosity at 1300 DEG C is 0.41Pa s.
The crackle using the covering slag gained strand of the present invention significantly reduces, and the probability that strand cracks occurs is less than 0.18%, and without surface edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
Embodiment four
The boron-containing steel continuous crystallizer protecting slag produced for D factory, is made up of the raw material of following weight parts: 4 parts of glass dust, pre-melt 43.3 parts, wollastonite 29 parts, carbon black 2 parts, 4 parts of graphite, 5 parts of sodium carbonate, sodium fluoride 2.5 parts, bauxite 2 parts, caustic-calcined magnesite 2 parts, boron carbide 5 parts, 1.2 parts of adhesive.
Wherein, composition and the percentage by weight of pre-melt of the present invention consists of: SiO242~45%、CaO36~39%、MgO1.5~3.5%、Fe2O3No more than 1%, Al2O34~6%、Na2O5~7%、F2~4%.Additionally, adhesive can use this area traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: basicity CaO/SiO2Being 1.15, fusing point is 1065 DEG C, and the viscosity at 1300 DEG C is 0.43Pa s.
The crackle using the covering slag gained strand of the present invention significantly reduces, and the probability that strand cracks occurs is less than 0.25%, and without obvious surface edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
Embodiment five
The boron-containing steel continuous crystallizer protecting slag produced for E factory, is made up of the raw material of following weight parts: 3.5 parts of glass dust, pre-melt 40 parts, wollastonite 28.6 parts, carbon black 2 parts, 4.1 parts of graphite, 5.3 parts of 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 of adhesive.
Wherein, composition and the percentage by weight of described pre-melt consists of: SiO242~45%、CaO36~39%、MgO1.5~3.5%、Fe2O3No more than 1%, Al2O34~6%、Na2O5~7%、F2~4%.Additionally, adhesive can use the traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: basicity CaO/SiO of described boron-containing steel continuous crystallizer protecting slag2Being 1.16, fusing point is 1080 DEG C, and the viscosity at 1300 DEG C is 0.43Pa s.
The crackle using the covering slag gained strand of the present invention significantly reduces, and the probability that strand cracks occurs is less than 0.23%, and without obvious surface edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
Embodiment six
The boron-containing steel continuous crystallizer protecting slag produced for F factory, is made up of the raw material of following weight parts: 3 parts of glass dust, pre-melt 55 parts, wollastonite 30 parts, carbon black 2 parts, 4.5 parts of graphite, 8 parts of sodium carbonate, sodium fluoride 3 parts, bauxite 2.6 parts, caustic-calcined magnesite 4.2 parts, boron carbide 8 parts, 1.2 parts of adhesive.
Wherein, composition and the percentage by weight of described pre-melt consists of: SiO242~45%、CaO36~39%、MgO1.5~3.5%、Fe2O3No more than 1%, Al2O34~6%、Na2O5~7%、F2~4%.Additionally, adhesive can use the traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: basicity CaO/SiO of described boron-containing steel continuous crystallizer protecting slag2Being 1.10, fusing point is 1030 DEG C, and the viscosity at 1300 DEG C is 0.44Pa s.
The crackle using the covering slag gained strand of the present invention significantly reduces, and the probability that strand cracks occurs is less than 0.28%, and without obvious surface edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
Embodiment seven
The boron-containing steel continuous crystallizer protecting slag produced for G factory, is made up of the raw material of following weight parts: 7 parts of glass dust, pre-melt 48 parts, wollastonite 35 parts, carbon black 2 parts, 5 parts of graphite, 9 parts of sodium carbonate, sodium fluoride 5.5 parts, bauxite 2 parts, caustic-calcined magnesite 5 parts, boron carbide 7 parts, 1.2 parts of adhesive.
Wherein, composition and the percentage by weight of described pre-melt consists of: SiO242~45%、CaO36~39%、MgO1.5~3.5%、Fe2O3No more than 1%, Al2O34~6%、Na2O5~7%、F2~4%.Additionally, adhesive can use the traditional binders such as dextrin.
The physical property of the present embodiment boron-containing steel continuous crystallizer protecting slag is: basicity CaO/SiO of described boron-containing steel continuous crystallizer protecting slag2Being 1.20, fusing point is 1090 DEG C, and the viscosity at 1300 DEG C is 0.44Pa s.
The crackle using the covering slag gained strand of the present invention significantly reduces, and the probability that strand cracks occurs is less than 0.30%, and without obvious surface edge cracks, effectively improves the crack-sensitivity sex chromosome mosaicism of boron-containing steel.
In sum, clearly, all any amendments made according to the technical support essence of the present invention and change still fall within the range of the technology of the present invention supports for every claim that the present invention a kind of boron-containing steel 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 of glass dust, pre-melt 40 ~ 55 parts, wollastonite 27 ~ 35 parts, carbon black 2 parts, 4 ~ 5 parts of graphite, 5 ~ 9 parts of 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 of 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 of glass dust, pre-melt 45 ~ 50 parts, wollastonite 27 ~ 29 parts, carbon black 2 parts, 4 ~ 5 parts of graphite, 5 ~ 7 parts of 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 of 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 of glass dust, pre-melt 48 parts, wollastonite 28 parts, carbon black 2 parts, 4 parts of graphite, 6 parts of 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 of adhesive.
4. the boron-containing steel continuous crystallizer protecting slag as described in claim 1 or 2 or 3, it is characterised in that: basicity CaO/SiO of described boron-containing steel continuous crystallizer protecting slag2It is 1.1 ~ 1.2.
5. boron-containing steel continuous crystallizer protecting slag as claimed in claim 4, it is characterised 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, it is characterised in that: described boron-containing steel continuous crystallizer protecting slag viscosity at 1300 DEG C is 0.40 ~ 0.44Pa s.
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| CN106270429B (en) * | 2015-06-09 | 2018-10-02 | 宝山钢铁股份有限公司 | Hypoergia covering slag and preparation method |
| CN114769533B (en) * | 2022-03-31 | 2024-08-20 | 西峡县西保冶金材料有限公司 | Functional protection material of continuous casting crystallizer for industrial pure iron |
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