CN113979759A - Drainage sand suitable for high-manganese steel continuous casting production and high self-opening rate and use method - Google Patents
Drainage sand suitable for high-manganese steel continuous casting production and high self-opening rate and use method Download PDFInfo
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- 239000004576 sand Substances 0.000 title claims abstract description 76
- 229910000617 Mangalloy Inorganic materials 0.000 title claims abstract description 34
- 238000009749 continuous casting Methods 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 13
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims abstract description 16
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000006229 carbon black Substances 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 10
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 21
- 239000011651 chromium Substances 0.000 claims description 21
- 229910052804 chromium Inorganic materials 0.000 claims description 19
- 239000010410 layer Substances 0.000 claims description 17
- 239000002344 surface layer Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 36
- 239000010959 steel Substances 0.000 abstract description 36
- 230000006872 improvement Effects 0.000 abstract description 4
- 230000003749 cleanliness Effects 0.000 abstract description 3
- 230000008595 infiltration Effects 0.000 abstract description 2
- 238000001764 infiltration Methods 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000005245 sintering Methods 0.000 description 11
- 238000005266 casting Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000011572 manganese Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 229910052596 spinel Inorganic materials 0.000 description 3
- 239000011029 spinel Substances 0.000 description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- BFXREAXRMUFNRP-UHFFFAOYSA-N [Mg][Zr][Cr] Chemical compound [Mg][Zr][Cr] BFXREAXRMUFNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000013051 drainage agent Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/44—Consumable closure means, i.e. closure means being used only once
- B22D41/46—Refractory plugging masses
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3241—Chromium oxides, chromates, or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
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- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
Abstract
The invention belongs to the technical field of high manganese steel continuous casting production, and particularly relates to high-self-opening-rate drainage sand suitable for high manganese steel continuous casting production and a use method thereof2＜25％，Fe2O3＜15％，Cr2O3＞32％，10％＜Al2O3＜18％，ZrO2More than 8 percent, not less than 0.3 percent and not more than 1.0 percent of carbon black, and H2O is less than or equal to 0.3 percent, and the granularity of the drainage sand is as follows: the ratio of 0.25mm-1.2mm is more than 95%, the ratio of the particle size smaller than 0.25mm is within 2%, and the ratio of the particle size of 1.2-1.5mm is within 3%. The drainage sand greatly reduces the occurrence probability of drainage phenomenon in the continuous casting production process of the high manganese steel, realizes the high-efficiency continuous casting production, and is also favorable for improving the cleanliness and the stability of the steel. In addition, the improvement on the use method further reduces the occurrence probability of molten steel infiltration and the use cost of the special drainage sand.
Description
Technical Field
The invention belongs to the technical field of high manganese steel continuous casting production, and particularly relates to high-self-opening-rate drainage sand suitable for high manganese steel continuous casting production and a use method thereof.
Background
In the continuous casting production process, the height of the automatic casting rate is one of the limiting links for realizing the protection casting of the large ladle. If the continuous casting ladle cannot be automatically cast, an operator needs to take the long nozzle down, use oxygen combustion drainage to enable the steel flow to rush to open the nozzle (open casting) to close the steel flow, then put the ladle long nozzle on, and open the large steel flow to carry out casting. According to the statistical data of daily production, the average pouring time of the drainage pouring is increased by more than 3 minutes compared with that of the automatic pouring single furnace, and meanwhile, nonmetal inclusions formed by a large amount of secondary oxidation of molten steel during open pouring have very adverse effects on steel quality. The high manganese steel has more and more extensive application in the aspects of engineering machinery, automobile parts, oil and gas storage tanks and the like because of the characteristics that the high manganese steel does not have in common steel grades, such as high strength, work hardening, wear resistance, impact resistance safety and the like. In the process of producing high manganese steel by continuous casting, drainage frequently occurs when casting or ladle replacement is carried out in continuous casting due to high Mn content, which becomes an important factor influencing the continuous casting production efficiency and the cleanliness of molten steel. The conventional drainage sand used for continuous casting mainly comprises siliceous and chromite drainage sand, and SiO is mainly used respectively2And Cr2O3Contains a certain amount of MgO and Fe2O3. Research shows that Mn in the high manganese steel reacts with chromite phase and quartz phase in the conventional drainage sand to cause severe sintering of the drainage sand, and the drainage probability is greatly increased along with the increase of the sintering degree between ore phases and the continuous thickening of a sintering layer, so that the smooth pouring of the high manganese steel is influenced. For example, chinese patent document CN103708842A discloses a chromium-magnesium-zirconium diversion sand and a preparation method thereof, which mainly emphasizes the function and specific preparation method of introducing zirconium, but if the sintering resistance is too good, the diversion sand at the contact part with molten steel is easy to infiltrate into the molten steel, and is cooled to form steel sand agglomerates, and the probability of back-splashing during casting and the burning loss of a ladle slide plate mechanism are increased dramatically. For another example, the drainage agent disclosed in chinese patent document CN103506614A, which is specially used for high manganese steel, mentions that drainage sand is similar to common chromium drainage sand, although the cost is low, the chromium drainage sand pair in the actual use processThe drainage effect of the steel is not ideal, and the steel is not particularly suitable for the over-vacuum high manganese steel with long steel filling time. For another example, chinese patent document CN111906290A discloses a special diversion sand for high manganese high aluminum steel and its use method: the method mainly introduces alumina, the alumina has certain limit requirements on the use content, the addition amount of the components is not too much under the condition of the existence of carbon black, otherwise, the volume expansion effect caused by the formation of the ferrochrome secondary spinel can be weakened in the reaction process of volume reduction between the components and the carbon black, and the effect of matching zirconium and chromium cannot be achieved under the condition of only introducing the alumina. For example, the steel used in the Chinese patent document CN113105253A, the trial-produced drainage sand Y1\ Y2\ Y3 mentioned in the patent mainly includes carbon steel, chrome molybdenum alloy steel, bearing steel, etc., but if it is used in high manganese steel, it is SiO because of its SiO2The content is as high as 27-37%, the steel is easy to react with Mn and Fe of steel, the content of aluminum trioxide is only 1-8%, the sintering reaction of a silicon-containing phase and an iron phase cannot be effectively blocked, particularly, a serious and excessively thick sintering layer with high strength is easy to generate under the condition that the steel ladle contains steel for a long time, and molten steel cannot break the sintering layer under the action of static pressure, so that oxygen burning drainage is caused; in addition, the patent contains 24-40% ZrO2The manufacturing cost of the drainage sand is greatly increased, and the thermal shock resistance of the drainage sand is reduced, so that the granularity ratio of the cracked drainage sand under the cooling condition cannot reach the initial expected optimal matching value, and the stability of the self-opening drainage effect is adversely affected.
Disclosure of Invention
In order to solve the problem of frequent drainage in the continuous casting process of the high manganese steel, the invention provides the drainage sand with high self-opening rate suitable for the continuous casting production of the high manganese steel and the use method thereof, thereby realizing the substantial improvement of the self-opening rate in the continuous casting production process of the high manganese steel.
In order to realize the purpose of the invention, the adopted technical scheme is as follows: drainage sand with high self-opening rate suitable for high manganese steel continuous casting production, wherein SiO is contained in mass components of drainage sand2＜25％，Fe2O3＜15％，Cr2O3＞32％，10％＜Al2O3＜18％，ZrO2More than 8 percent, not less than 0.3 percent and not more than 1.0 percent of carbon black, and H2O≤0.3％；
The drainage sand granularity is: the ratio of 0.25mm-1.2mm is more than 95%, the ratio of the particle size smaller than 0.25mm is within 2%, and the ratio of the particle size of 1.2-1.5mm is within 3%.
On one hand, quartz SiO in the drainage sand is controlled2Content (< 25%) and result in Cr2O3Low melting point Fe2O3The content is less than 15 percent, and the Cr content is improved2O3The content is more than 32 percent, and Al with certain content is introduced2O3(10％＜Al2O3< 18%) and ZrO2The more than 8 percent of the slag is uniformly distributed between the chromite phase and the quartz phase to prevent the formation of a large-range thick sintering layer and enhance the integral refractoriness of the drainage sand; at the same time, some carbon black (0.3-1.0%) and Cr are added2O3And Fe2O3The melt reacts to form secondary spinel to generate proper volume expansion, which is more beneficial to improving the self-opening rate, and the added carbon black can also be used as a lubricant to improve the overall fluidity of the drainage sand; it is particularly noted that Al is added with carbon black2O3The addition amount of the chromium iron is not excessive, otherwise, the volume expansion effect caused by the formation of the ferrochrome secondary spinel can be weakened in the volume reduction reaction process between the chromium iron and the carbon black;
in the aspect of particle size distribution, small particles are easier to form a sintering layer due to larger specific surface area, and excessive large particles are not beneficial to piling the drainage sand into an ideal steamed bread shape with good fluidity.
Considering that a sintering layer with a certain thickness is properly formed on a molten steel contact layer to prevent the penetration of molten steel to the drainage sand so as to avoid the generation of large-range steel sand mixing, the condition is also not beneficial to the general promotion of the self-opening rate, and the risk of burning and damaging a ladle drainage slide plate mechanism is existed, the application also provides an application method of the drainage sand, which comprises the steps of infusing common chromium drainage sand on a surface layer to form the sintering layer, adopting the drainage sand suitable for the high-manganese steel continuous casting production with high self-opening rate near the surface layer and a middle layer, and infusing the common chromium drainage sand on a lower layer; SiO in the mass component of common chromium drainage sand2＜35％，Cr2O3＞20％，Fe2O3，H2O is less than or equal to 0.5 percent. This application carries out innovation layering with ordinary chromium matter drainage sand and the drainage sand for high manganese steel of this application and uses in coordination, finally forms and can prevent that the molten steel infiltration from not influencing the three-layer type drainage sand structure of just use cost comparatively economy again.
Furthermore, the surface layer common chromium drainage sand accounts for 8-15% of the total mass of the drainage sand, and the lower layer common chromium drainage sand accounts for 50-65% of the total mass of the drainage sand.
Compared with the prior art, the novel special drainage sand for high manganese steel continuous casting is invented by aiming at the problem that the self-opening rate of the common drainage sand is obviously lower in the high manganese steel continuous casting production process and optimizing the component design adjustment and the granularity control range, so that the drainage phenomenon occurrence probability in the high manganese steel continuous casting production process is greatly reduced, the continuous casting high-efficiency production is realized, and the cleanliness and the stability of steel are also favorably improved. In addition, the occurrence probability of molten steel penetration and the use cost of special drainage sand are further reduced through reasonable improvement on the use method, so that the effective and economic improvement of the high manganese steel continuous casting self-opening rate is realized under the condition that the existing ladle tool mechanism and the sand filling device are not changed and the use safety is ensured.
Detailed Description
The present invention is not limited to the following embodiments, and those skilled in the art can implement the present invention in other embodiments according to the disclosure of the present invention, or make simple changes or modifications on the design structure and idea of the present invention, and fall into the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is described in more detail below with reference to the following examples:
example 1 three-layer synergistic use of special-purpose drainage sand and ordinary drainage sand (high self-opening rate, safety, economy)
Special drainageSand composition and particle size: SiO 2212.3％,Fe2O3 9.8％,Cr2O335.7％,MgO 9.8％，Al2O316.4％,ZrO210.4%, C (carbon black) 0.7%, H20.2 percent of O, 96.7 percent of 0.25mm-1.2mm, 1.2 percent of granularity less than or equal to 0.25mm, and 2.1 percent of granularity of 1.2-1.5 mm.
Common chromium drainage sand: SiO 2233.4％,Fe2O3 18.6％,Cr2O322.6％，MgO 6.5,H20.6 percent of O, the proportion of the granularity of less than or equal to 0.25mm is 5.6 percent, the proportion of the granularity of 0.25-1.2mm is 87.6 percent, the proportion of the granularity of 1.2-1.5mm is 5.1 percent, and the proportion of the granularity of more than 1.5mm is 1.7 percent.
When the high manganese steel casting sand is produced, common chromium-based drainage sand accounting for 60 percent of the total amount is added, then special drainage sand for the high manganese steel accounting for 30 percent of the total amount is added, and finally 10 percent of common chromium-based drainage sand is added, wherein the self-opening rate is 99.7 percent, the probability of steel sand mixture occurrence is 0.12 percent, and the burning loss condition of a steel ladle sliding plate mechanism is not found.
COMPARATIVE EXAMPLE 1 ordinary chrome drainage Sand (Low self-opening ratio)
The common chromium drainage sand comprises the following components in percentage by weight: SiO 2232.7％,Fe2O3 19.2％,Cr2O322.8％，MgO 6.1,H20.5 percent of O, the proportion of the granularity of less than or equal to 0.25mm is 5.2 percent, the proportion of the granularity of 0.25-1.2mm is 89.2 percent, the proportion of the granularity of 1.2-1.5mm is 4.2 percent, and the proportion of the granularity of more than 1.5mm is 1.4 percent.
When the high manganese steel is produced, common chromium drainage sand is adopted, the self-opening rate is 87.6%, the probability of steel sand mixture occurrence is 0.11%, and the probability of steel ladle sliding plate mechanism burning loss is 0.2%.
Comparative example 2 pure new type of stuffing sand (slightly higher self-opening rate, high cost and high firing mechanism)
The special stuffing sand comprises the following components in percentage by weight: SiO 2212.1％,Fe2O3 9.6％,Cr2O335.9％,MgO 9.2％，Al2O316.5％,ZrO211.2%, C (carbon black) 0.6%, H20.1 percent of O and the proportion of 0.25mm-1.2mm are 97.4 percent, and the proportion of the granularity less than or equal to 0.25mm is 1.1 percent and 1 percent.The ratio of the particle size of 2-1.5mm is 1.5%.
When the high manganese steel is produced and filled with the sand, the special stuffing sand for the high manganese steel is adopted, the self-opening rate is 93.2 percent, the probability of steel sand mixture occurrence is 5.6 percent, and the probability of burning loss of a steel ladle sliding plate mechanism is 2.9 percent.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and their concepts should be equivalent or changed within the technical scope of the present invention.
Claims (3)
1. The utility model provides a drainage sand suitable for high manganese steel continuous casting production is from rate of opening which characterized in that: SiO in the mass component2＜25％，Fe2O3＜15％，Cr2O3＞32％，10％＜Al2O3＜18％，ZrO2More than 8 percent, not less than 0.3 percent and not more than 1.0 percent of carbon black, and H2O≤0.3％；
The drainage sand granularity is: the ratio of 0.25mm-1.2mm is more than 95%, the ratio of the particle size smaller than 0.25mm is within 2%, and the ratio of the particle size of 1.2-1.5mm is within 3%.
2. The application of the drainage sand suitable for producing the high self-opening rate by the continuous casting of the high manganese steel according to claim 1, is characterized in that: the method comprises the steps of infusing common chromium drainage sand into a surface layer to form a sintered layer, adopting the drainage sand suitable for high-self-opening rate production of high manganese steel continuous casting near the surface layer and the middle layer, and infusing common chromium drainage sand into a lower layer; SiO in the mass component of common chromium drainage sand2＜35％，Cr2O3＞20％，Fe2O3，H2O≤0.5％。
3. The application of the drainage sand suitable for producing the high self-opening rate by the continuous casting of the high manganese steel according to claim 2 is characterized in that: the surface layer common chromium drainage sand accounts for 8-15% of the total drainage sand, and the lower layer common chromium drainage sand accounts for 50-65% of the total drainage sand.
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| US20020128144A1 (en) * | 1999-05-27 | 2002-09-12 | Nkk Corporation | Filler sand for a ladle tap hole valve |
| US20070027024A1 (en) * | 2003-09-12 | 2007-02-01 | Akira Ohashi | Filler for ladle sliding and opening/closing device |
| CN103708842A (en) * | 2013-12-12 | 2014-04-09 | 南阳铭鑫斯迪奥科技有限公司 | Chrome-magnesia-zircon stuffing sand and preparation method thereof |
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