CN102652989A - Tundish molten steel covering agent for high-cleanness steel pouring and preparation method and application of tundish molten steel covering agent - Google Patents
Tundish molten steel covering agent for high-cleanness steel pouring and preparation method and application of tundish molten steel covering agent Download PDFInfo
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- CN102652989A CN102652989A CN2012101429640A CN201210142964A CN102652989A CN 102652989 A CN102652989 A CN 102652989A CN 2012101429640 A CN2012101429640 A CN 2012101429640A CN 201210142964 A CN201210142964 A CN 201210142964A CN 102652989 A CN102652989 A CN 102652989A
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Abstract
The invention relates to the technical field of clean steel melting and continuous casting, and particularly relates to a tundish molten steel covering agent for high-cleanness steel pouring, a preparation method for the tundish molten steel covering agent and an application of the tundish molten steel covering agent. The covering agent consists of the following components by weight percentage: 80 to 85 percent of CaO, 8 to 12 percent of MgO, 2 to 6 percent of B2O3, 1 to 4 percent of BN and 0 to 5 percent of impurities, wherein the impurities comprise the following substances of less than or equal to 0.5 percent of SiO2, less than or equal to 0.5 percent of Al2O3, less than or equal to 0.1 percent of ferric oxide, less than or equal to 0.01 percent of P and less than or equal to 0.01 percent of S. The tundish molten steel covering agent is suitable for pouring of high-cleanness boron-containing steel and is high in alkalinity, good in slag absorption performance and good in expandability; the molten steel surface is well protected, so that the molten steel can be prevented from sucking air and being oxidized; particularly, a boride in the covering agent can effectively control the burning loss of micro alloyed boron elements in the molten steel, so that the micro alloyed element content can be accurately controlled; furthermore, the covering agent has high vitrification performance and is beneficial to clearing slag rings; the service life of equipment is prolonged; raw materials of the covering agent is readily obtained; and the covering agent is low in cost and free from pollution, has remarkable economic and social benefits and is deserved to popularization.
Description
Technical field
The present invention relates to clean steel and smelt and the continuous casting technology field particularly a kind of molten steel covering agent and preparation method and application that is used for high clean steel continuous pouring tundish.
Background technology
Along with social development is increasingly high to the steel product quality requirement, the cleanliness factor control of steel is to improve one of main means of steel product quality, therefore; The casting process of steel will adopt the full guard cast; In big bag, adopt ladle covering agent, in tundish, adopt tundish covering flux, in crystallizer, adopt crystallizer protecting residue; Wrap tundish and tundish greatly and all adopt mouth of a river protection to crystallizer; So just realized the full guard cast, wherein, the performance of tundish covering flux and result of use have material impact to the molten steel quality.
Initial tundish covering flux mainly is a charring rice husk, plays covering and heat insulating and prevents the effect of molten steel oxidation, but because the charring rice husk main component is a carbon; Meeting carburetting in steel; Therefore, developed middle low-carbon (LC) coverture and carbon-free covering agent afterwards again, and; The function of tundish covering flux by single heat insulation function to insulation, anti-oxidation, anti-air-breathing and absorb and multi-functional conversion such as be mingled with; This just requires the carbon-free or few carbon of coverture itself, anaerobic voltinism or weak oxide property, no objectionable impurities own and has to absorb harmful ability, possesses good physical property simultaneously in addition, makes its spreadability guarantee advantages such as molten steel is exposed well.
In the prior art, the subject matter that coverture exists is following:
1, the basicity of coverture is low, causes absorbing the ability that is mingled with
In order to adjust the fusing point of coverture, the basicity (CaO/SiO of present coverture
2) generally be controlled at below 4, the fusing point of this slag is lower, but absorbs steel-deoxidizing product such as SiO
2, Al
2O
3Deng ability relatively poor, and serious to the erosion of cylinder-packing in the middle of the alkalescence, can cause the secondary pollution of molten steel, therefore, need the high basicity tundish covering flux of exploitation.
2, contain aluminium oxide in the coverture, cause the less stable of coverture
Al in the coverture
2O
3At certain CaO/Al
2O
3Scope in make coverture have low melting point, if but Al in the coverture
2O
3Content high, Al
2O
3Be easy to saturatedly, cause the fusing point of coverture to raise, occur hardening, influence coverage effect and Al in the molten steel
2O
3The absorption of type impurity; Therefore, reduce Al in the coverture
2O
3, be one of feasible direction of exploitation high-performance tundish covering flux.
3, carbon containing or contain oxidant (Fe in the coverture
2O
3Deng)
Existing coverture contains the meltdown property that a certain amount of carbon is used to adjust coverture basically, for reducing coverture carburetting in steel, contains small amount of Fe in the low-carbon (LC) coverture
2O
3In oxidant, this can make a small amount of element oxidation that is prone to oxidation in the steel, and in boron-containing steel, boron element has the good reputation of vitamin in the steel, but its content needs accurately control, and this just requires to develop carbon-free and nonoxidizing tundish covering flux.
For example in the prior art, the coverture that Chinese invention patent (denomination of invention: a kind of tundish covering flux, application number 200910219785.0) proposes consists of CaO 35-46%, SiO
228-62%, Al
2O
39-21%, Fe
2O
30.3-1%, C0-18% etc.; The coverture that Chinese invention patent (denomination of invention: the high clean steel smelting of a kind of low-carbon (LC) is used tundish covering flux, application number 200810226018.8) proposes consists of CaO 45-55%, SiO
25-7%, Al
2O
330-32%, TiO
22.5-3.2%, C 1.5-6% etc., this coverture also contains fluoride and alkali metal oxide; Or the like all have the problems referred to above in the invention of these prior aries.
In sum, develop the good carbon-free anaerobic voltinism of a kind of serviceability and the strong high basicity tundish covering flux of slag absorbing ability has important value.
Summary of the invention
The objective of the invention is: invent good carbon-free anaerobic voltinism of a kind of serviceability and the strong high basicity tundish covering flux of slag absorbing ability; The present invention possesses high basicity, alumina-free, slag absorbing ability, carbon-free anaerobic voltinism and does not pollute characteristics such as molten steel, solves the problem that present tundish covering flux exists.
Realize that technical scheme of the present invention is:
A kind ofly be used for the cast of high clean steel and use the tundish molten steel covering agent, it is characterized in that: the composition of said coverture is by mass percentage: CaO 80-85%, MgO 8-12%, B
2O
32-6%, BN 1-4%, surplus is impurity 0-5%, SiO in the impurity
2≤0.5%, Al
2O
3≤0.5%, iron oxide≤0.1%, P≤0.01%, S≤0.01%; Coverture of the present invention can be ground to granularity less than 0.075mm through oven dry with the lime that meets purity grade, magnesia, boric anhydride and boron nitride as raw material, by forming the levigate mixing in preparation back, packed for standby use after oven dry; Coverture of the present invention also can use boron mud to be base-material, with boron mud, lime, magnesia, boron nitride and boric anhydride press composition requirement with addition of after, mixing is levigate, through the oven dry after packed for standby use; Use when of the present invention, drop into tundish with the addition of steel 1Kg coverture per ton according to big Baogang water weight.
During coverture of the present invention was formed, CaO was main basic component, and content is at 80-85%; Possesses the superhigh-alkalinity characteristic; CaO can combine with deoxidation products such as Si, Al, can improve the slag absorbing of coverture and go to be mingled with ability, and CaO also has desulfurization and the effect that reduces sulfide in the steel simultaneously.
B in the coverture of the present invention
2O
3Have and reduce coverture fusing point and surface tension; Improve the effect of coverture fusing and spreading property, improve coverture insulation, prevent air-breathing, oxidation and raising slag absorbing performance, simultaneously; Coverture of the present invention is specially adapted to the cast of boracic clean steel, improves B in the coverture
2O
3Activity, thereby suppress the oxidation of boron element in the steel, B
2O
3Suitable addition in the scope of 2-6%.
The effect of MgO in the coverture of the present invention with adjustment coverture fusing point and viscosity, and have the effect of protecting middle cylinder-packing, reducing because of cylinder-packing corrodes to peel off and pollute molten steel, its optimum range is at 8-12%.
BN is a kind of skeleton particle in the coverture of the present invention, substitutes traditional carbon and carbide, has the effect of adjustment coverture burn-off rate, fusing time and melting layer structure, has the advantage of not carburetting of molten steel, and the suitable addition of BN is in the scope of 1-4%.
Other materials are unavoidable impurities 0-5% in this coverture, select for use at raw material to make impurity SiO in the coverture in the process
2≤0.5%, Al
2O
3≤0.5%, iron oxide≤0.1%, P≤0.01%, S≤0.01%.
Major advantage compared with prior art of the present invention is following:
(1), coverture of the present invention is a kind of superhigh-alkalinity coverture, coverture absorbs SiO
2, Al
2O
3Ability Deng deoxidation products improves, after coverture uses 120min, and the SiO in the coverture
2Content reach more than 9.5% the Al in the coverture
2O
3Content reach more than 47.5%, high when using existing coverture during same steel grade than cast (adopt existing coverture, after the cast 120min, SiO in the coverture
2And Al
2O
3Content be respectively about 7.5% and 30.5%), visible coverture of the present invention removes to be mingled with and can will exceed about more than 20% by the existing coverture of force rate with slag absorbing.
(2), the B in the coverture of the present invention
2O
3Have remarkable reduction coverture fusing point and a capillary effect, improve the effect of coverture fusing and spreading property, improve coverture insulation, prevent that molten steel is air-breathing, oxidation and slag absorbing performance; The fusing point of coverture of the present invention is 1300-1450 ℃ scope, and surface tension is in the scope of 0.3-0.65 N/m, and this can be through regulating B
2O
3Amount reach different application targets.
(3), no strong oxidizing property oxide in the coverture of the present invention, so this coverture anaerobic voltinism can reduce the oxidation of alloying element in the steel, coverture of the present invention is specially adapted to the cast of boracic clean steel, improves B in the coverture
2O
3Activity, thereby further suppress the oxidation of boron element in the steel, can make the stable control of easily oxidized alloy element in the steel.
(4), do not contain the component that to isolate free carbon in the coverture of the present invention, molten steel is not polluted in not carburetting in steel yet.
(5), the effect of the BN in the coverture of the present invention with adjustment coverture burn-off rate, fusing time and melting layer structure; The fusing time of coverture of the present invention is in the 20-55s scope; Coverture melting layer structure and fusing time can accurately be regulated through the amount of regulating BN, to adapt to different application targets.
(6), coverture raw material sources of the present invention are wide, cost is low, realizes that discarded boron mud utilizes again, and the coverture after using can be used for other metallurgical slag making, like the grate-layer material of ladle refining slag, electric furnace steel making etc., realizes that resources circulation utilizes again.
(7), have the high-vitrification characteristic after the coverture of the present invention cooling, this is because B
2O
3Be strong vitrifying oxide, be easy to cleaning than traditional silicate coverture, be difficult for dry slag, improve the service life of equipment, tundish prolongs more than 30% online service time.
The specific embodiment
Embodiment 1:
As raw material, lime and magnesia are dried down at 200 ℃ with lime, magnesia, boric anhydride and boron nitride, according to lime 82%, and magnesia 9%; Boric anhydride 5%, boron nitride 4% batching, all raw materials are through being ground to granularity less than 0.075mm; Grind mixing behind the batch mixing once more, process coverture of the present invention, through XRD analysis; Consist of (mass percent): CaO 81%, MgO 8.5%, B
2O
34.8%, BN 4%, SiO in the surplus impurity
20.4%, Al
2O
30.5%, iron oxide 0.1%, and P 0.008%, and S 0.008%; Detect through meltdown property, 1360 ℃ of this coverture fusing points, the fusing time under 1450 ℃ is 48s, surface tension is 0.4N/m; In cast carbon aluminium-killed steel tundish, use; Addition is 100 tons of accounting by molten steel weight in the big bag; The addition of coverture of the present invention is 100 kilograms, uses through cast and finds, uses the present invention better than the coverture effect that adopts other silicate or calciate material; It is good to be mainly reflected in coverture spreadability of the present invention, and molten steel does not have exposed liquid level phenomenon; Particularly through analyzing discovery to pouring back tundish residue; Adopt coverture of the present invention; The quantity of residue mesosilicic acid salt and aluminate increases obviously, explains that the slag absorbing ability of coverture of the present invention improves, again through strand is carried out inclusion analysis; When confirming to adopt the present invention's ratio under identical technical conditions, to adopt the coverture of other silicate or calciate material; Field trashes such as the oxide in the steel, sulfide reduce more than 20%, therefore can confirm, the slag absorbing of coverture of the present invention can improve about 20% by force rate tradition coverture; In addition, the element in the steel is the non-oxidation loss in tundish, does not also have the carburetting phenomenon, has embodied protection and the control of the present invention to molten steel component.
Embodiment 2:
As raw material, lime and magnesia are dried down at 200 ℃ with lime, magnesia, boric anhydride and boron nitride, according to lime 85%, and magnesia 10%; Boric anhydride 3%, boron nitride 2% batching, all raw materials are through being ground to granularity less than 0.075mm; Grind mixing behind the batch mixing once more, process coverture of the present invention, through XRD analysis; Consist of (mass percent): CaO 84%, MgO 9.5%, B
2O
32.8%, BN 2%, SiO in the surplus impurity
20.35%, Al
2O
30.4%, iron oxide 0.1%, and P 0.008%, and S 0.008%; Detect through meltdown property, 1400 ℃ of this coverture fusing points, the fusing time under 1450 ℃ is 50s, surface tension is 0.45N/m; In cast carbon aluminium-killed steel tundish, use, addition is 90 tons of accounting by molten steel weight in the big bag, and the addition of coverture of the present invention is 90 kilograms; Use discovery through cast; It is better than under identical technical conditions, adopting the coverture effect of other silicate or calciate material to use the present invention, and it is good to be mainly reflected in coverture spreadability of the present invention, and molten steel does not have exposed liquid level phenomenon; Coverture fusing coverage effect is good, does not have the phenomenon that hardens; Particularly through analyzing discovery to pouring back tundish residue; Adopt coverture of the present invention; The quantity of residue mesosilicic acid salt and aluminate increases obviously, explains that the slag absorbing ability of coverture of the present invention improves, again through strand is carried out inclusion analysis; When confirming to adopt the present invention's ratio under identical technical conditions, to adopt the coverture of other silicate or calciate material; Field trashes such as the oxide in the steel, sulfide reduce more than 20%, therefore can confirm, the slag absorbing of coverture of the present invention can improve about 20% by force rate tradition coverture; In addition, the element in the steel is the non-oxidation loss in tundish, does not also have the carburetting phenomenon, has embodied protection and the control of the present invention to molten steel component, reaches better protection cast effect.
Embodiment 3:
As raw material, boron mud, lime and magnesia are dried down at 200 ℃ with boron mud, lime, magnesia, boric anhydride and boron nitride, according to boron mud 36%, lime 55%, and magnesia 4%; Boric anhydride 3%, boron nitride 2% batching, all raw materials are through being ground to granularity less than 0.075mm; Grind mixing behind the batch mixing once more, process coverture of the present invention, through XRD analysis; Consist of (mass percent): CaO 80%, MgO 11.5%, B
2O
32.3%, BN 2%, SiO in the surplus impurity
20.38%, Al
2O
30.5%, iron oxide 0.08%, and P 0.008%, and S 0.008%; Detect through meltdown property, 1420 ℃ of this coverture fusing points, the fusing time under 1450 ℃ is 55s, surface tension is 0.48N/m; In cast carbon aluminium-killed steel tundish, use, addition is 90 tons of accounting by molten steel weight in the big bag, and the addition of coverture of the present invention is 90 kilograms; Use discovery through cast; It is better than under identical technical conditions, adopting the coverture effect of other silicate or calciate material to use the present invention, and it is good to be mainly reflected in coverture spreadability of the present invention, and molten steel does not have exposed liquid level phenomenon; Coverture fusing coverage effect is good, does not have the phenomenon that hardens; Particularly through analyzing discovery to pouring back tundish residue; Adopt coverture of the present invention; The quantity of residue mesosilicic acid salt and aluminate increases obviously, explains that the slag absorbing ability of coverture of the present invention improves, again through strand is carried out inclusion analysis; When confirming to adopt the present invention's ratio under identical technical conditions, to adopt the coverture of other silicate or calciate material; Field trashes such as the oxide in the steel, sulfide reduce more than 20%, therefore can confirm, the slag absorbing of coverture of the present invention can improve about 20% by force rate tradition coverture; In addition, the element in the steel is the non-oxidation loss in tundish, does not also have the carburetting phenomenon, has embodied protection and the control of the present invention to molten steel component, reaches better protection cast effect.
Embodiment 4:
As raw material, boron mud, lime and magnesia are dried down at 200 ℃ with boron mud, lime, magnesia, boric anhydride and boron nitride, according to boron mud 10%, lime 80%, and magnesia 4%; Boric anhydride 4%, boron nitride 2% batching, all raw materials are through being ground to granularity less than 0.075mm; Grind mixing behind the batch mixing once more, process coverture of the present invention, through XRD analysis; Consist of (mass percent): CaO 85%, MgO 8%, B
2O
34.2%, BN 2%, SiO in the surplus impurity
20.30%, Al
2O
30.40%, iron oxide 0.06%, and P 0.008%, and S 0.008%; Detect through meltdown property, 1390 ℃ of this coverture fusing points, the fusing time under 1450 ℃ is 49s, surface tension is 0.49N/m; In cast carbon aluminium-killed steel tundish, use, addition is 90 tons of accounting by molten steel weight in the big bag, and the addition of coverture of the present invention is 90 kilograms; Use discovery through cast; It is better than under identical technical conditions, adopting the coverture effect of other silicate or calciate material to use the present invention, and it is good to be mainly reflected in coverture spreadability of the present invention, and molten steel does not have exposed liquid level phenomenon; Coverture fusing coverage effect is good, does not have the phenomenon that hardens; Particularly through analyzing discovery to pouring back tundish residue; Adopt coverture of the present invention; The quantity of residue mesosilicic acid salt and aluminate increases obviously, explains that the slag absorbing ability of coverture of the present invention improves, again through strand is carried out inclusion analysis; When confirming to adopt the present invention's ratio under identical technical conditions, to adopt the coverture of other silicate or calciate material; Field trashes such as the oxide in the steel, sulfide reduce more than 20%, therefore can confirm, the slag absorbing of coverture of the present invention can improve about 20% by force rate tradition coverture; In addition, the element in the steel is the non-oxidation loss in tundish, does not also have the carburetting phenomenon, has embodied protection and the control of the present invention to molten steel component, reaches better protection cast effect.
Claims (4)
1. one kind is used for the cast of high clean steel and uses the tundish molten steel covering agent, and it is characterized in that: the composition of said coverture is by mass percentage: CaO 80-85%, MgO 8-12%, B
2O
32-6%, BN 1-4%, surplus is impurity 0-5%, SiO in the impurity
2≤0.5%, Al
2O
3≤0.5%, iron oxide≤0.1%, P≤0.01%, S≤0.01%.
2. a kind of preparation method who is used for high clean steel cast with the tundish molten steel covering agent as claimed in claim 1; It is characterized in that: said coverture with lime, magnesia, boric anhydride and boron nitride as raw material; Be ground to granularity less than 0.075mm through oven dry; By forming the levigate mixing in preparation back, packed for standby use after oven dry.
3. a kind of preparation method who is used for high clean steel cast with the tundish molten steel covering agent as claimed in claim 1; It is characterized in that: said coverture is base-material to use boron mud; With boron mud, lime, magnesia, boron nitride and boric anhydride press composition requirement with addition of after; Mixing is levigate, packed for standby use after oven dry.
4. a kind of application that is used for the cast of high clean steel with the tundish molten steel covering agent as claimed in claim 1 is characterized in that: when using said coverture, according to the addition input tundish of big Baogang water weight with steel 1Kg coverture per ton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101429640A CN102652989A (en) | 2012-05-10 | 2012-05-10 | Tundish molten steel covering agent for high-cleanness steel pouring and preparation method and application of tundish molten steel covering agent |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101429640A CN102652989A (en) | 2012-05-10 | 2012-05-10 | Tundish molten steel covering agent for high-cleanness steel pouring and preparation method and application of tundish molten steel covering agent |
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| CN103341606A (en) * | 2013-07-03 | 2013-10-09 | 北京科技大学 | High-magnesium covering agent material capable of being used for tundish and preparing method thereof |
| CN107414045A (en) * | 2017-06-28 | 2017-12-01 | 常州明华运输有限公司 | A kind of tundish covering flux |
| CN107598090A (en) * | 2017-08-24 | 2018-01-19 | 合肥正明机械有限公司 | A kind of Steel Casting Risers coverture |
| CN109365789A (en) * | 2018-10-29 | 2019-02-22 | 河钢股份有限公司 | A kind of nitrogenous steel ingot casting powder |
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| CN107414045A (en) * | 2017-06-28 | 2017-12-01 | 常州明华运输有限公司 | A kind of tundish covering flux |
| CN107598090A (en) * | 2017-08-24 | 2018-01-19 | 合肥正明机械有限公司 | A kind of Steel Casting Risers coverture |
| CN109365789A (en) * | 2018-10-29 | 2019-02-22 | 河钢股份有限公司 | A kind of nitrogenous steel ingot casting powder |
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Application publication date: 20120905 |