CN114875207B - Consumable body for ladle refining and refining method thereof - Google Patents
Consumable body for ladle refining and refining method thereof Download PDFInfo
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- CN114875207B CN114875207B CN202210553453.1A CN202210553453A CN114875207B CN 114875207 B CN114875207 B CN 114875207B CN 202210553453 A CN202210553453 A CN 202210553453A CN 114875207 B CN114875207 B CN 114875207B
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- 238000007670 refining Methods 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 117
- 239000010959 steel Substances 0.000 claims abstract description 117
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 11
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 9
- 239000000440 bentonite Substances 0.000 claims abstract description 9
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 26
- 239000008188 pellet Substances 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 14
- 229910052786 argon Inorganic materials 0.000 claims description 13
- 238000007664 blowing Methods 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 5
- 238000000354 decomposition reaction Methods 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 239000002893 slag Substances 0.000 abstract description 22
- 230000000694 effects Effects 0.000 abstract description 8
- 239000012535 impurity Substances 0.000 abstract description 4
- 241001591024 Samea Species 0.000 abstract 1
- 239000012467 final product Substances 0.000 abstract 1
- 238000002844 melting Methods 0.000 description 10
- 230000008018 melting Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 230000003749 cleanliness Effects 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 230000009172 bursting Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011812 mixed powder Substances 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to the field of ladle refining and provides a consumable body for ladle refining and a method for preparing the sameA method for refining the same. The consumable body for ladle refining comprises a moving system and a consumable body, wherein the moving system controls the consumable body to move, and the consumable body comprises a plurality of layers of sleeves filled with small refining agent balls. The small balls of the refining agent are CaO-Al 2 O 3 ‑SiO 2 -MgO, bentonite and CaCO 3 Mixing the powders to obtain the final product. Compared with the method of directly adding refining agent powder into molten steel, the method reduces the splashing of the molten steel and reduces the loss. The refining agent in different layers enters the molten steel sectionally to obtain the maximum refining effect along with the refining time. The refining agent in the consumable body forms a large amount of fine bubbles and slag drops in the molten steel, and the fine bubbles and the molten steel fully react to capture small-size inclusions in the molten steel; the slag drops obviously increase the contact area with the molten steel, adsorb a large amount of impurities and foreign elements in the molten steel, float up to the surface of the molten steel and improve the refining effect of the molten steel.
Description
Technical Field
The invention relates to the field of ladle refining, in particular to a consumable body for ladle refining and a method thereof.
Background
The cleanliness of steel determines the quality and industrial application of steel, the key point for controlling the cleanliness of steel lies in controlling inclusions in the steel, and the maximum reduction of the content of the inclusions in the steel has important significance for producing high-quality steel.
The bubbles in the molten steel can be attached by collision or float with inclusion carried by wake flow to achieve the purpose of removing the inclusion, the bubble removing the inclusion is realized by the flotation action of the bubbles, the smaller the bubble size is, the higher the collision probability of the bubbles and the inclusion is, the better the inclusion removing effect is, and the smaller the inclusion size is, the higher the probability of being attached by the bubbles is. A ladle bottom argon blowing method is provided in continuous casting rotary table ladle bottom argon blowing equipment and a using method thereof, a tundish gas curtain retaining wall technology is provided in slab continuous casting tundish gas curtain retaining wall technology development and application, gas permeable bricks or gas permeable plugs are adopted to introduce gas into molten steel in the two methods, but the two methods generate large bubble size, poor dispersion degree and low inclusion removal efficiency, and particularly the removing effect on microscopic inclusions is not ideal. Meanwhile, the actual production adopts a mode of directly adding refining slag into molten steel for refining. The density of the refining slag is less than that of the molten steel, and the refining slag can only float on the top of the molten steel in the refining process. Finally, the refining slag is deoxidized and desulfurized through reaction with the steel-slag interface, and absorbs inclusions in the steel. The removal efficiency of inclusions in the refining process is also low because the inclusions need to move to the steel-slag interface to be possibly adsorbed by the refining slag.
Along with the stricter and stricter control requirements of the novel high-end steel grade on inclusions, the research on removing the inclusions in the steel by using small bubbles is also more and more focused. Therefore, it is very important to develop a new technology to obtain the bubbles with controllable size, stable quantity and dispersion distribution. Meanwhile, the contact area of the refining slag and the molten steel is increased, more opportunities are created to enable inclusions to be adsorbed by the refining slag, and the cleanliness of the molten steel is improved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a consumable body for ladle refining and a method thereof, which can provide micro bubbles and slag drops in a ladle to remove fine inclusion and impurity elements in molten steel, and fully perform reaction by increasing the contact area of the bubbles and the slag drops with the molten steel, thereby improving the refining effect and the steel quality.
The technical scheme of the invention is as follows: a consumable body for ladle refining comprises a moving system and a consumable body 3; the moving system is used for controlling the movement of the consumable body 3, and the consumable body 3 comprises a plurality of layers of sleeves which are filled with refining agents.
The refining agent is CaO-Al 2 O 3 -SiO 2 MgO, bentonite and CaCO 3 Mixed powder, and pellets prepared by mixing according to mass percent, wherein the weight ratio of CaO:45% -60%; al (Al) 2 O 3 ：15％-30％；SiO 2 ：≤10％；MgO：3％-10％；CaCO 3 ：5Percent-20%; 1% -2% of bentonite; the sleeve is made of steel.
The grain diameter of the refining agent pellets is 5-40mm.
The multilayer sleeve is provided with 3-5 layers, the diameter and the height of the sleeve are increased layer by layer, the volume of the inner layer of sleeve accounts for 20-30% of the volume of the outer layer of sleeve, and the height of the outermost layer of sleeve accounts for 60-70% of the height of the steel ladle. The steel wall of the sleeve is gradually melted in the refining process of the consumable body, the small balls of the refining agent enter molten steel layer by layer along with the melting of the sleeve to refine the molten steel, and the bottom of the sleeve is provided with fine air holes, so that gas generated by the decomposition of the refining agent in the sleeve at the inner layer of the consumable body can be discharged, and the consumable body is prevented from bursting due to too high internal air pressure in the refining process.
The moving system comprises a motor 8, a clamping device 4, a rotating device 5 and a lifting device 6, wherein the motor 8 provides power for the rotating device 5 and the lifting device 6; one end of the lifting device 6 is arranged on the fixed base 7, and the other end is connected with the rotating device 5; the holding device 4 is mounted at the end of the rotating device 5 for holding the consumable body 3.
When the consumable body 3 is used for refining, the consumable body is rotated to the upper space of the steel ladle 1 by the rotating device 5 and then is sent into the molten steel 2 by the lifting device 6.
The consumable body for ladle refining is refined in a ladle by the following specific steps:
1) The consumable body 3 is arranged on the clamping device 4, and the consumable body 3 rotates to the upper part of the ladle 1 along with the rotating device 5;
2) When the consumable body 3 rotates to the position above the steel ladle 1, the consumable body 3 is inserted into the molten steel 2 through the lifting device 6, and when the outer layer steel shell of the consumable body 3 is melted, the small refining agent balls enter the molten steel 2;
3) After the refining is finished, the consumable body 3 is lifted above the ladle 1 by the lifting device 3, and then the ladle 1 is unscrewed by the rotating device 5.
4) After the consumable body 3 is screwed out, the ladle is subjected to soft argon blowing, the flow of argon is 20-100NL/min, and the argon blowing time is 10-25min.
The consumable body 3 functions in the following manner: when the refining starts, the outer steel shell of the outer layer of the consumable body is heated and gradually melted, the external refining agent pellets enter the molten steel and are decomposed to generate fine bubbles with the diameter of 20-40 mu m, so that the pellets are burst, and the refining agent is simultaneously melted into slag drops and is dispersed and distributed in the molten steel. The generated bubbles and slag drops have the function of capturing fine inclusions, and the generated slag drops have larger size and 0.1-2mm diameter, so the slag drops finally float to a top slag layer due to buoyancy after capturing the fine inclusions. As the outer layer of the consumable body melts, the temperature of the inner part gradually rises, and the refining agent balls in the inner layer are cracked again and melted, so that continuous refining effect is generated. Based on the multilayer structure of the consumable body, the outer layer plays a role in heat preservation and heat insulation for the inside, and prevents the small balls in the inside from bursting and melting too early.
The outer steel shell on the outermost layer of the consumable body 3 is heated and melted, the outer refining agent pellets enter the molten steel 2, and the outer consumable body plays a role in heat insulation and is used for preventing the refining agent pellets in the inner consumable body from being decomposed; as the outer consumable body is consumed, the outer steel shell of the middle consumable body starts to be heated and melted, and the small balls of the refining agent enter the molten steel 2 and play a role in heat insulation on the inner consumable body; when the middle layer consumable body completely enters the molten steel 2, the outer layer steel shell of the inner layer consumable body starts to be heated and melted, and the small balls of the internal refining agent completely enter the molten steel 2.
Compared with the prior art, the invention has the advantages that:
(1) The invention improves the efficiency of removing the inclusion in the process of refining the steel ladle, improves the cleanliness of steel, and the refining agent in the consumable body can form a large amount of fine bubbles and slag drops in the molten steel, and the fine bubbles can fully react with the molten steel to capture small-size inclusion in the molten steel; the slag drop obviously increases the contact area with the molten steel, can adsorb a large amount of impurities and impurity elements in the molten steel, mainly plays roles in desulfurization and deoxidation, and floats to the surface of the molten steel, thereby improving the refining effect of the molten steel.
(2) Compared with the method of directly adding refining agent powder into molten steel, the method for refining by adding the consumable body can reduce molten steel splashing and loss. The refining agent in the consumable body can continuously form fine bubbles in the molten steel, secondary oxidation of the molten steel caused by naked eyes formed on the surface of the molten steel is avoided, and molten steel splashing is avoided.
(3) The refining is carried out by adopting a mode of adding the consumable body, so that the small balls of the refining agent can be directly refined in the molten steel, the refining time can be effectively shortened, and the refining cost can be reduced.
(4) The consumable body is simple to operate and low in danger, and the bottom of the sleeve of the consumable body is provided with the fine air holes, so that gas generated by thermal decomposition of a refining agent in the sleeve of the inner layer of the consumable body can be discharged, bursting caused by gas expansion is avoided, and production safety is ensured.
Drawings
Fig. 1 is a schematic view of an overall structure of a consumable body for ladle refining;
fig. 2 is a sectional view of an overall structure of a consumable body for ladle refining;
fig. 3 is a plan view of the entire structure of the consumable body for ladle refining.
Wherein: 1, steel ladle; 2, molten steel; 3 a consumable body; 4, a clamping device; 5, a rotating device; 6, a lifting device; 7 fixing the base; 8 motor.
Detailed Description
Example 1
A consumable body for ladle refining is prepared from CaO (48kg) and Al as refining agent through proportioning 2 O 3 27kg，SiO 2 9kg and 6.5kg of MgO are put into a crushing grinder to be ground for 2 hours, the materials are fully and uniformly mixed by a mixer and then are put into a slag melting machine together to be pre-melted, the pre-melting temperature is 1500 ℃, and the pre-melting time is 2 hours. And carrying out secondary crushing on the pre-melted particles to obtain powder with the particle size distribution of 0.1-1 mm. Taking CaCO 3 8.5kg of bentonite and 1kg of bentonite are put into a crusher to be crushed for 2 hours, and then the powder after secondary crushing and the crushed calcium carbonate powder are put into a dryer to be dried, wherein the drying temperature is 400 ℃, and the drying time is 15 hours. And putting the dried mixed powder into a pelletizer for pelletizing, and screening out small pellets with the particle size of 5-40mm.
The specific process and operation method are as follows:
step 1, for an 80-ton steel ladle, the height of the steel ladle is 3000mm, three layers of steel sleeves with the length of 1800mm and the maximum diameter of 150mm are taken, the thickness of the steel wall is 2mm, 68kg of prepared composite pellets are uniformly filled into each layer of steel sleeve, and a consumable body 3 is formed;
and 2, mounting the consumable body 3 on a clamping device 4, after the steel ladle 1 reaches a designated position, raising the consumable body 3 to a certain height through a lifting device 6, rotating the consumable body 3 above the steel ladle 1 through a rotating device 5, lowering the consumable body 1 into the molten steel 2 through the lifting device 6, melting the steel wall of a casing on the outer layer of the consumable body 3, gradually introducing small balls inside into the molten steel 2 for reaction, and simultaneously decomposing the small balls of the refining agent in the consumable body 3 to generate gas which flows out from a gas hole at the bottom of the steel wall to stir the molten steel 2.
And 3, after the reaction is finished for 3 minutes, finishing refining, lifting the rest consumable body 3 out of the steel ladle 1 through the lifting device 6, moving the consumable body to a position to be worked through the rotating device 5, and then carrying out soft blowing on the steel ladle, wherein the flow of argon is 50NL/min, and the soft blowing time is 20min. Through measurement and detection, the oxygen content T of the refined molten steel is 13ppm.
Example 2
A consumable body for ladle refining is proportionally prepared from CaO 55kg 2 O 3 20kg，SiO 2 9kg and 5kg of MgO are put into a crushing grinder to be ground for 2 hours, and are fully and uniformly mixed by a mixer and then are put into a slag melting machine to be pre-melted, wherein the pre-melting temperature is 1600 ℃, and the pre-melting time is 2 hours. And (3) carrying out secondary crushing on the pre-melted particles to obtain powder with the particle size distribution of 0.1-1 mm. Taking CaCO 3 9.5kg of bentonite and 1.5kg of bentonite are put into a crusher to be crushed for 2 hours, and then the powder after secondary crushing and the crushed calcium carbonate powder are put into a dryer to be dried, wherein the drying temperature is 500 ℃, and the drying time is 15 hours. And putting the dried mixed powder into a pelletizer for pelletizing, and screening out small pellets with the particle size of 5-40mm.
The specific process and operation method are as follows:
step 1, for a 90-ton steel ladle, the height of the steel ladle is 3250mm, 4 layers of steel sleeves with the length of 1950mm and the maximum diameter of 180mm are taken, the thickness of the steel wall is 2mm, 78kg of prepared composite pellets are uniformly filled into each layer of steel sleeves, and a consumable body 3 is formed;
and 2, mounting the consumable body 3 on a clamping device 4, after the steel ladle 1 reaches a designated position, raising the consumable body 3 to a certain height through a lifting device 6, rotating the consumable body 3 above the steel ladle 1 through a rotating device 5, lowering the consumable body 3 into the molten steel 2 through the lifting device 6, melting the outer casing steel wall of the consumable body 3 at the moment, gradually introducing the inner pellets into the molten steel for reaction, and simultaneously decomposing the refining agent pellets in the consumable body 3 to generate gas which flows out from a gas hole at the bottom of the steel wall to stir the molten steel.
And 3, after the reaction is carried out for 4 minutes, the refining is finished, the rest consumable body 3 is lifted out of the steel ladle 1 through the lifting device 6, then the steel ladle is moved to a position to be operated through the rotating device 5, and then the steel ladle is subjected to soft blowing, wherein the argon flow is 40NL/min, and the soft blowing time is 20min. Through measurement and detection, the oxygen content T of the refined molten steel is 12ppm.
Example 3
Comparative example
After the ladle is refined by adopting the method, the total oxygen content in the steel can be effectively reduced, and the cleanliness of the steel is improved. After the ladle bottom argon blowing refining is finished, the total oxygen content in the molten steel can be only reduced to 15-20ppm. Such as: when 80T of steel ladle is adopted for bottom blowing argon refining, T [ O ] in molten steel is 16ppm after refining is finished. And refining in a way of adding a consumable body into a ladle, namely adopting the same method of the embodiment 1, the T [ O ] in the molten steel can be further reduced to 12ppm, and the effect is obvious.
Claims (8)
1. A consumable body for ladle refining, characterized in that the consumable body for ladle refining comprises a moving system and a consumable body (3); the moving system is used for controlling the movement of the consumable body (3), the consumable body (3) comprises a plurality of layers of sleeves, and refining agent balls are arranged in the sleeves; the multilayer sleeves are provided with 3-5 layers, the diameter and the height of each sleeve are increased layer by layer, and the volume of the inner layer of sleeves accounts for 20% -30% of the volume of the outer layer of sleeves; the height of the outermost sleeve in the ladle (1) accounts for 60-70% of the height of the ladle (1).
2. The consumable body for ladle refining according to claim 1, wherein the consumable body is characterized in thatThe grain diameter of the refining agent pellets is 5-40mm, and the refining agent pellets are CaO-Al 2 O 3 -SiO 2 MgO, bentonite and CaCO 3 Mixing powder, wherein the powder is mixed according to the mass percentage, and the weight ratio of CaO:45% -60%; al (Al) 2 O 3 ：15％-30％；SiO 2 ：≤10％；MgO：3％-10％；CaCO 3 :5% -20%; 1% -2% of bentonite; the sleeve is made of steel.
3. The consumable body for ladle refining according to claim 1 or 2, wherein the bottom of the sleeve is provided with fine air holes for discharging gas generated by decomposition of the refining agent in the sleeve at the inner layer of the consumable body.
4. The consumable body for ladle refining according to claim 3, wherein the moving system comprises a motor (8), a holding device (4), a rotating device (5) and a lifting device (6), the motor (8) provides power for the rotating device (5) and the lifting device (6); one end of the lifting device (6) is arranged on the fixed base (7), and the other end is connected with the rotating device (5); the clamping device (4) is arranged at the tail end of the rotating device (5) and is used for fixing the consumable body (3).
5. Consumable body for ladle refining according to claim 4, characterized in that the consumable body (3) is rotated by the rotating means (5) above the ladle (1) and fed into the molten steel (2) by the lifting means (6) when used for refining.
6. The refining method of the consumable body for ladle refining according to claim 4 or 5 for removing inclusions, comprising the steps of:
1) The consumable body (3) is arranged on the clamping device (4), and the consumable body (3) rotates above the ladle (1) along with the rotating device (5);
2) When the consumable body (3) rotates above the ladle (1), the consumable body (3) is sent into the molten steel (2) through the lifting device (6), and when the outer steel shell of the consumable body (3) is melted, the small balls of the refining agent enter the molten steel (2);
3) After refining, the consumable body (3) is lifted above the ladle (1) through the lifting device (6), and then the ladle (1) is unscrewed through the rotating device (5);
4) After the consumable body (3) is screwed out, the ladle (1) is subjected to soft argon blowing.
7. The refining method of the consumable body for ladle refining according to claim 6, wherein the soft argon blowing has an argon gas flow rate of 20 to 100NL/min and an argon blowing time of 10 to 25min.
8. The refining method for removing inclusions in the consumable body for ladle refining according to claim 6, wherein after the outer steel shell of the consumable body (3) is melted, the small balls of the refining agent in the outermost sleeve enter the molten steel (2) and perform a heat insulation function on the consumable body (3); along with the consumption of the consumable body (3), the steel casing of the casing at the middle layer of the consumable body (3) starts to be heated and melted after the refining agent pellets in other layers of casings of the consumable body (3) are decomposed, and the refining agent pellets in the casing of the layer enter the molten steel (2) and simultaneously play a role in heat insulation on the residual consumable body (3); along with the whole molten steel (2) that gets into of consumable body (3) middle level department, the sleeve pipe steel casing of consumable body (3) inlayer department begins to be heated and melts, and its inside refining agent pellet all gets into molten steel (2).
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| CN103243194B (en) * | 2013-05-31 | 2015-01-21 | 安徽工业大学 | Method for optimizing steel structure by adding nano particles into steel liquid |
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