Antioxidant composition for centrifugal casting alloy roller and application of antioxidant composition

Abstract

The invention provides an antioxidant composition for a centrifugal casting alloy roller and application of the antioxidant composition. The antioxidant composition for the centrifugal casting alloy roller comprises the following components in parts by weight: 5-20 parts of zirconite, 2-15 parts of borocalcite, 2-15 parts of first sodium salt, 2-10 parts of second sodium salt and 2-10 parts of third sodium salt, the first sodium salt is fluorine-containing sodium salt; the second sodium salt is boron-containing sodium salt; the third sodium salt is selected from one or more of sodium carbonate, sodium hydroxide, sodium bicarbonate, sodium oxide and sodium chloride. According to the antioxidant composition for centrifugal casting of the alloy roller, the antioxidant composition for centrifugal casting of the alloy roller is provided through well-designed chemical components and formula proportions of the antioxidant, and the antioxidant composition can effectively prevent oxidation of an alloy material in the centrifugal casting process, so that the surface quality and the structural uniformity of an obtained casting are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal casting, and in particular, to an antioxidant composition for centrifugally cast alloy rolls and its application. Background Art

[0002] Centrifugal casting is a casting method that fills and solidifies molten metal by rotating a mold. During centrifugal casting, the molten metal is evenly distributed in the rapidly rotating mold to form a composite casting with different materials on the inner and outer layers. An alloy roll is a component with a certain shape obtained by pouring alloy liquid into a cavity during centrifugal casting and then naturally cooling. It is mainly used in roughing mills and intermediate rolling mills and has advantages such as high high-temperature strength and good wear resistance.

[0003] For the production of alloy rolls, it is generally required that the outer layer of the casting has high hardness and wear resistance, while the inner layer should have good toughness and strength. Centrifugal casting technology can push the molten metal towards the mold wall by centrifugal force, thus forming a composite structure with a dense outer layer and a strong inner layer. However, alloys are prone to react with oxides such as oxygen in the air at high temperatures to form an oxide layer, which affects subsequent processing and service life.

[0004] That is to say, since the outer layer metal in the centrifugal casting process is prone to form an oxide layer during solidification, preventing oxidation has become the key in the production of vertical centrifugal casting rolls. The formation of the oxide layer not only affects the surface quality of the roll but may also lead to uneven metal microstructure, further affecting the mechanical properties of the casting. Therefore, developing and using anti-oxidation protective agents has become a necessary means to improve the quality of vertical centrifugal casting rolls.

[0005] Based on this, how to provide an antioxidant composition based on the centrifugal casting process of alloy rolls to effectively prevent the oxidation reaction of the molten alloy from occurring, thereby improving the mechanical properties and surface quality of the obtained alloy rolls, is one of the important technical problems to be solved in this field. Summary of the Invention

[0006] The main object of the present invention is to provide an antioxidant composition for centrifugally cast alloy rolls and its application to solve the problem of poor antioxidant effect of the antioxidant used in the centrifugal casting of alloy rolls in the prior art.

[0007] To achieve the above object, a first aspect of the present invention provides an antioxidant composition for centrifugally cast alloy rolls. By weight, the antioxidant composition for centrifugally cast alloy rolls comprises 5-20 parts of zircon, 2-15 parts of ulexite, 2-15 parts of a first sodium salt, 2-10 parts of a second sodium salt, and 2-10 parts of a third sodium salt; the first sodium salt is a sodium salt containing fluorine; the second sodium salt is a sodium salt containing boron; the third sodium salt is selected from one or more of sodium carbonate, sodium hydroxide, sodium bicarbonate, sodium oxide, and sodium chloride.

[0008] Further, by weight, the antioxidant composition for centrifugally cast alloy rolls comprises 5-15 parts of zircon, 2-10 parts of ulexite, 2-5 parts of the first sodium salt, 2-5 parts of the second sodium salt, and 2-5 parts of the third sodium salt.

[0009] Further, the sodium salt containing fluorine is selected from one or more of sodium fluoride, sodium fluorosilicate, sodium hexafluoroaluminate, sodium hexafluorozirconate, sodium hexafluorotitanate, and sodium hexafluorophosphate; and / or, the sodium salt containing boron is selected from one or more of anhydrous borax, borax decahydrate, borax pentahydrate, sodium metaborate, sodium borate, and sodium borosilicate.

[0010] Further, by weight, the antioxidant composition for centrifugally cast alloy rolls comprises 8-10 parts of zircon, 4-5 parts of ulexite, 4-5 parts of the first sodium salt, 2-3 parts of the second sodium salt, and 2-3 parts of the third sodium salt.

[0011] Further, the particle size of the antioxidant composition for centrifugally cast alloy rolls is 20-100 mesh.

[0012] A second aspect of the present invention provides an application of the above antioxidant composition for centrifugally cast alloy rolls in the preparation process of alloy rolls. The alloy roll preparation process includes a step of centrifugally casting a melt containing an antioxidant, and the antioxidant is the above antioxidant composition for centrifugally cast alloy rolls.

[0013] Further, calculated based on the total weight of the melt being 100%, the content of the antioxidant composition for iron-containing centrifugally cast alloy rolls is 10%-15%.

[0014] Further, the preparation method of the alloy roll includes: Step S1, melting alloy raw materials to obtain a first melt; Step S2, adding the antioxidant composition for centrifugally cast alloy rolls into the first melt to obtain a second melt; Step S3, subjecting the second melt to centrifugal casting and cooling treatment in sequence to obtain an alloy roll.

[0015] Further, the temperature of the first melt is 1300°C-1500°C.

[0016] Further, in step S3, the rotation speed used in the centrifugal casting is 800 rpm to 1000 rpm; and / or, the cooling rate of the cooling treatment is 30 °C / min to 50 °C / min.

[0017] Applying the technical solution of the present invention, through the carefully designed chemical composition and formulation ratio of the antioxidant, an antioxidant composition for centrifugal casting of alloy rolls is provided, which can effectively prevent the oxidation of alloy materials during centrifugal casting, thereby improving the surface quality and structural uniformity of the obtained castings. Detailed implementation manners

[0018] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below in conjunction with the embodiments.

[0019] As described in the background art, the antioxidants used in the prior art for centrifugal casting of alloy rolls have the problem of poor effects, resulting in serious oxidation reactions of the molten alloy, and further resulting in poor mechanical properties and low surface quality of the alloy rolls obtained by centrifugal casting. To solve the above technical problems, the first aspect of the present invention provides an antioxidant composition for centrifugal casting alloy rolls. By weight, the antioxidant composition for centrifugal casting alloy rolls includes 5 to 20 parts of zircon, 2 to 15 parts of ulexite, 2 to 15 parts of the first sodium salt, 2 to 10 parts of the second sodium salt, and 2 to 10 parts of the third sodium salt; the first sodium salt is a sodium salt containing fluorine; the second sodium salt is a sodium salt containing boron; the third sodium salt is selected from one or more of sodium carbonate, sodium hydroxide, sodium bicarbonate, sodium oxide, and sodium chloride.

[0020] The above-mentioned antioxidant composition for centrifugally cast alloy rolls provided by the present invention consists of zircon, ulexite, a first sodium salt, a second sodium salt, and a third sodium salt in a specific formulation. Through precise chemical compositions and ratios, this formulation can effectively prevent the oxidation of molten alloy during centrifugal casting, thereby improving the surface quality and structural uniformity of the resulting castings, reducing defects, and enhancing mechanical properties and service life. Specifically, during its use, the above-mentioned antioxidant composition for centrifugally cast alloy rolls can: (1) isolate the contact between air and the molten alloy: the above-mentioned antioxidant composition can form a protective film on the surface of the alloy to prevent it from contacting oxygen in the air in the molten state, thus avoiding the occurrence of oxidation reactions. (2) improve the surface quality of the alloy castings obtained by casting: the above-mentioned antioxidant composition can help the castings obtained by centrifugal casting maintain good surface quality, avoid the generation of oxide layers, and ensure the density and wear resistance of the outer layer of metal. (3) promote the fluidity and uniform solidification of the alloy melt: the above-mentioned antioxidant composition can improve the fluidity of the molten alloy in the centrifugal casting mold, promote its uniform distribution on the mold wall, and further improve the overall quality of the castings obtained by centrifugal casting. (4) improve the comprehensive performance of the castings: the use of the above-mentioned antioxidant composition helps to reduce casting defects (such as pores, cracks, etc.), and improve the mechanical properties, strength, and toughness of the castings.

[0021] In the above formula, 5 to 20 parts of zircon can maintain a stable structure at high temperatures and is not oxidized and decomposed. Its main function is to form a stable protective layer, optimize the slag system, improve the stability of metallurgical reactions, and reduce burning loss. And it can significantly reduce the melting points of the slag and the molten metal, improve fluidity, and strengthen the melting effect. 2 to 15 parts of fluorine-containing sodium salt is an effective flux, which can effectively reduce the viscosity of the alloy melt, promote the flow of the molten slag, and enhance the slag-iron separation. 2 to 15 parts of ulexite can reduce the melting point of the flux and promote the melting of oxides in the melt. At the same time, it forms a vitreous molten slag at high temperatures and forms a dense protective film on the surface of the melt, effectively reducing oxidation loss. And it reduces the surface tension and viscosity of the molten slag, making it easier to flow and discharge from the surface of the melt. At the same time, zircon and ulexite can reduce the melting point, promote the formation and fluidity of the molten slag, promote the uniform distribution of the molten slag, enable impurities to be removed more easily, and improve the purity of the melt. The fluorine-containing sodium salt can reduce the melting point of the flux and enhance the melting effect; promote the melting of impurity oxides and improve the slagging ability; assist in forming a protective layer to inhibit the oxidation of liquid metal; reduce the viscosity of the molten slag and enhance fluidity. The boron-containing sodium salt can lower the temperature, resist oxidation, and reduce the melting point. Because borate decomposes into B2O3 at high temperatures, it can significantly reduce the melting point of the molten slag, making melting easier. At the same time, B2O3 can form a glassy protective film on the metal surface, reducing the oxidation loss of the melt. And, the fluorine-containing sodium salt and the boron-containing sodium salt, as fluxes, can synergistically form a molten slag with impurities in the alloy. The third sodium salt, on the one hand, acts as a flux, and on the other hand, can adjust the viscosity, ensuring the proper fluidity and distribution of the flux, thereby forming an effective protective layer and ultimately optimizing the performance of the castings obtained by centrifugal casting.

[0022] More importantly, each component in the above antioxidant composition provided by the present invention can jointly inhibit the oxidation of the molten alloy during centrifugal casting through synergistic effects.

[0023] Furthermore, by weight, the antioxidant composition for centrifugal casting alloy rolls includes 5 to 15 parts of zircon, 2 to 10 parts of ulexite, 2 to 5 parts of the first sodium salt, 2 to 5 parts of the second sodium salt, and 2 to 5 parts of the third sodium salt. By further adjusting the ratios of zircon, ulexite, and the three sodium salts, the performance of the antioxidant composition is more significantly optimized, enabling it to provide a more stable and efficient anti-oxidation effect, thereby improving the consistency of the quality and the surface quality of the alloy roll castings obtained by centrifugal casting.

[0024] In several preferred embodiments, in order to achieve a more excellent antioxidant effect, regarding the specific types of sodium fluoride salts and sodium borate salts, preferably the sodium fluoride salt is selected from one or more of sodium fluoride (NaF), sodium hexafluorosilicate (Na2SiF6), sodium hexafluoroaluminate (Na3AlF6), sodium hexafluorozirconate (Na2ZrF6), sodium hexafluorotitanate (Na2TiF6), and sodium hexafluorophosphate (NaPF6); and / or, the sodium borate salt is selected from one or more of anhydrous borax (Na2B4O7), borax decahydrate (Na2B4O7·10H2O), borax pentahydrate (Na2B4O7·5H2O), sodium metaborate (NaBO2), sodium borate (Na2B2O4), and sodium borosilicate (Na2O·B2O3·SiO2).

[0025] Furthermore, in order to more effectively exert the synergistic effect of each component in the antioxidant composition for centrifugally cast alloy rolls, so as to achieve a more excellent anti-oxidation effect and obtain a centrifugally cast alloy roll with better comprehensive performance, by weight, the antioxidant composition for centrifugally cast alloy rolls includes 8-10 parts of zircon, 4-5 parts of ulexite, 4-5 parts of the first sodium salt, 2-3 parts of the second sodium salt, and 2-3 parts of the third sodium salt;

[0026] Through a large number of experiments, the inventors further preferably, by weight, the antioxidant composition for centrifugally cast alloy rolls includes 8 parts of zircon, 5 parts of ulexite, 5 parts of sodium hexafluoroaluminate, 3 parts of sodium borate, and 3 parts of sodium carbonate; or, by weight, the antioxidant composition for centrifugally cast alloy rolls includes 10 parts of zircon, 4 parts of ulexite, 4 parts of sodium hexafluorosilicate, 3 parts of sodium decaborate, and 3 parts of sodium bicarbonate; or, by weight, the antioxidant composition for centrifugally cast alloy rolls includes 10 parts of zircon, 4 parts of ulexite, 4 parts of sodium hexafluorophosphate, 3 parts of sodium hexafluorozirconate, and 3 parts of sodium carbonate. Under the above three specific component formulation conditions, centrifugal casting is carried out using the corresponding antioxidant composition, and the surface oxide layer of the obtained casting reaches the minimum, and the uniformity of the internal structure is significantly improved, and the comprehensive performance of the alloy roll casting is better.

[0027] In order to strengthen the uniform coating effect of the provided antioxidant composition in the centrifugal casting environment, that is, under high-speed rotation, so as to more significantly enhance its anti-oxidation effect on the alloy melt during centrifugal casting, further preferably, the particle size of the antioxidant composition for centrifugally cast alloy rolls is 20-100 mesh, and more preferably 50-100 mesh.

[0028] The second aspect of the present invention provides an application of the above antioxidant composition for centrifugally cast alloy rolls in the preparation process of alloy rolls. The preparation process of the alloy rolls includes a step of centrifugally casting a melt containing an antioxidant, and the antioxidant is the above antioxidant composition for centrifugally cast alloy rolls. The alloy rolls obtained by centrifugal casting using the antioxidant composition provided by the present invention have more excellent properties, including more superior surface quality and more superior mechanical property performance.

[0029] Further, calculated based on the total weight of the melt being 100%, the content of the antioxidant composition for iron-containing centrifugally cast alloy rolls is 10% - 15%. By adding a specific proportion of the antioxidant composition to the melt in the present invention, a thicker and more stable protective layer can be formed when the final casting is obtained, effectively isolating the oxygen in the air from contacting the hot alloy, significantly reducing the formation of the oxide layer, and thereby improving the surface quality of the casting.

[0030] Further, the preparation method of the alloy roll includes: Step S1, melting alloy raw materials to obtain a first melt; Step S2, adding the antioxidant composition for centrifugally cast alloy rolls to the first melt to obtain a second melt; Step S3, subjecting the second melt to centrifugal casting and cooling treatment in sequence to obtain the alloy roll. During this process, the alloy raw materials are melted to obtain the first melt, and then the antioxidant composition is added to the first melt to obtain the second melt. The above antioxidant composition provided by the present invention reacts with the surface of the melt at high temperature to form a protective film to isolate oxygen. At the same time, specific components in the composition can remove impurities in the melt, improve the fluidity of the melt, thereby promoting the uniform distribution and rapid cooling of the metal under the action of centrifugal force, and avoiding the formation of the oxide layer. By the above method of introducing the antioxidant composition and the method of preparing the alloy roll, it is possible to efficiently and reliably prevent the oxidation of the alloy during centrifugal casting, and significantly improve the surface quality and mechanical properties of the roll casting.

[0031] In order to achieve a more effective antioxidant protection effect and obtain alloy rolls with more excellent mechanical properties and surface quality, the temperature of the first melt is 1300°C - 1500°C. And more preferably, when the temperature is 1350 ± 10°C, it can promote the full melting of the antioxidant and the uniform mixing with the alloy melt, reduce the premature solidification or local accumulation of the antioxidant, and thus more significantly optimize the protection effect.

[0032] In several typical embodiments, in order to further improve the mechanical property performance of the alloy roll after forming, in Step S3, it is preferred that the rotation speed used for centrifugal casting is 800 rpm - 1000 rpm, so as to promote the more uniform distribution of the alloy melt in the centrifugal casting mold and form a denser and higher surface quality casting structure.

[0033] For the cooling stage of the casting, in several more typical embodiments, the cooling rate of the cooling treatment is 30°C / min to 50°C / min. The above-mentioned preferred and more preferred cooling rate ranges help to further optimize the microstructure of the casting, reduce the crack formation caused by rapid cooling, while reducing the oxidation risk caused by slow cooling, and ultimately more significantly improve the integrity and various properties of the casting obtained by centrifugal casting.

[0034] The following further describes the present application in detail with specific embodiments, and these embodiments should not be construed as limiting the scope claimed by the present application.

[0035] Unless otherwise defined, all professional terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present invention.

[0036] Example 1

[0037] An antioxidant composition for centrifugal casting alloy rolls:

[0038] Weigh industrial-grade raw materials respectively: 80 g of zircon (ZrSiO4), 50 g of ulexite (Ca2B2O5), 50 g of cryolite (Na3AlF6), 30 g of sodium borate (Na2B2O4), 30 g of sodium carbonate (Na2CO3) (this raw material ratio is the same as shown in Table 1), to obtain a total of 240 g of the antioxidant composition for centrifugal casting alloy rolls, and its particle size is 20 - 100 mesh.

[0039] A centrifugal casting method for ferroalloy rolls:

[0040] (1) Take a 2 L plain porcelain crucible and wrap it with a crucible sleeve made of clay with a height close to that of the plain porcelain crucible for heat preservation. After pre-burning at 1360°C, melt 24 pieces of high-chromium iron with a diameter of φ30 * 30 mm at 1360°C for 60 min to obtain a first melt. When the surface of the melted and clarified melt has a slightly oxidized skin but not seriously, in the plain porcelain crucible, directly add the prepared above-mentioned antioxidant composition powder to the first melt at a temperature of 1360°C to obtain a second melt, and the melting time of the antioxidant composition is 59 s; in the second melt, the content of the antioxidant composition used is 10%;

[0041] (2) Carry out centrifugal casting on the obtained second melt at a rotational speed of 800 rpm, and then carry out cooling treatment at a cooling rate of 50°C / min to obtain a ferroalloy roll.

[0042] Example 2

[0043] An antioxidant composition for centrifugal casting alloy rolls:

[0044] Weigh industrial-grade raw materials separately: 100 g of zircon (ZrSiO4), 40 g of ulexite (CaSiO3), 40 g of sodium hexafluorosilicate (Na2SiF6), 30 g of disodium tetraborate (Na2B4O7), and 30 g of sodium bicarbonate (NaHCO3), shake well and set aside (the same raw material ratio is shown in Table 1), to obtain a total of 240 g of antioxidant composition for centrifugal casting alloy rolls, with a particle size of 20 - 100 mesh.

[0045] A centrifugal casting method for ferroalloy rolls:

[0046] (1) Take a 2 L porcelain crucible, wrap it with a crucible sleeve made of clay that is approximately the same height as the porcelain crucible for heat preservation. After pre-burning at 1360 °C, melt 24 pieces of high-chromium iron with a size of φ30*30 mm at 1360 °C for 60 min to obtain a first melt. When the surface of the melt is slightly oxidized but not severely oxidized, directly add the prepared antioxidant composition powder to the first melt at a temperature of 1360 °C in the porcelain crucible to obtain a second melt, and the melting time of the antioxidant composition is 62 s; in the second melt, the content of the antioxidant composition used is 15%.

[0047] (2) Conduct centrifugal casting on the obtained second melt at a rotational speed of 900 rpm, and then perform a cooling treatment at a cooling rate of 40 °C / min to obtain a ferroalloy roll.

[0048] Example 3

[0049] An antioxidant composition for centrifugal casting alloy rolls:

[0050] Weigh industrial-grade raw materials separately: 100 g of zircon (ZrSiO4), 40 g of ulexite (CaSiO3), 40 g of sodium hexafluorophosphate (NaPF6), 30 g of sodium zirconium fluoride, and 30 g of sodium carbonate (Na2CO3), shake well and set aside (the same raw material ratio is shown in Table 1), to obtain a total of 120 g of antioxidant composition for centrifugal casting alloy rolls, with a particle size of 50 - 100 mesh.

[0051] A centrifugal casting method for ferroalloy rolls:

[0052] (1) Take a 2 L porcelain crucible, wrap it with a crucible sleeve made of clay that is approximately the same height as the porcelain crucible for heat preservation. After pre-burning at 1360 °C, melt 24 pieces of high-chromium iron with a size of φ30*30 mm at 1360 °C for 60 min to obtain a first melt. When the surface of the melt is slightly oxidized but not severely oxidized, directly add the prepared antioxidant composition powder to the first melt at a temperature of 1360 °C in the porcelain crucible to obtain a second melt, and the melting time of the antioxidant composition is 45 s; in the second melt, the content of the antioxidant composition used is 10%.

[0053] (2) Centrifugally cast the obtained second melt at a rotational speed of 1000 rpm, and then perform a cooling treatment at a cooling rate of 30 °C / min to obtain an iron alloy roll.

[0054] Examples 4 to 6

[0055] The differences between Examples 4 to 6 and Example 1 are only in the contents of the raw material components of the antioxidant composition. See Table 1 for details.

[0056] Example 7

[0057] An antioxidant composition for centrifugally cast alloy rolls:

[0058] The difference between this example and Example 1 is only that the particle size of the obtained antioxidant composition for centrifugally cast alloy rolls is changed to 10 - 20 mesh.

[0059] A centrifugal casting method for an iron alloy roll: The same as Example 1.

[0060] Example 8

[0061] An antioxidant composition for centrifugally cast alloy rolls: The same as Example 1.

[0062] A centrifugal casting method for an iron alloy roll:

[0063] The difference between this example and Example 1 is only that the content of the antioxidant composition used in the second melt obtained in step (1) is changed to 5%.

[0064] Example 9

[0065] An antioxidant composition for centrifugally cast alloy rolls: The same as Example 1.

[0066] A centrifugal casting method for an iron alloy roll:

[0067] The difference between this example and Example 1 is only that in step (1), the temperature of the first melt when adding the antioxidant composition powder is changed to 1300 °C, and the second melt is obtained therefrom.

[0068] Example 10

[0069] An antioxidant composition for centrifugally cast alloy rolls: The same as Example 1.

[0070] A centrifugal casting method for an iron alloy roll:

[0071] The difference between this example and Example 1 is only that in step (1), the temperature of the first melt when adding the antioxidant composition powder is changed to 1500 °C, and the second melt is obtained therefrom.

[0072] Example 11

[0073] An antioxidant composition for centrifugally cast alloy rolls: the same as in Example 1.

[0074] A centrifugal casting method for ferroalloy rolls:

[0075] The difference between this example and Example 1 is only that: in step (2), the rotation speed of centrifugal casting is changed to 500 rpm, and the cooling rate during cooling is changed to 20 °C / min.

[0076] Example 12

[0077] An antioxidant composition for centrifugally cast alloy rolls: the same as in Example 1.

[0078] A centrifugal casting method for ferroalloy rolls:

[0079] The difference between this example and Example 1 is only that: in step (2), the rotation speed of centrifugal casting is changed to 1500 rpm, and the cooling rate during cooling is changed to 80 °C / min.

[0080] Comparative Example 1 and Comparative Example 2

[0081] The difference between Comparative Example 1 and Comparative Example 2 and Example 1 is only that the content of the raw material components of the antioxidant composition is different, as shown in Table 1 for details.

[0082] Table 1

[0083] parts by weight zircon ulexite first sodium salt second sodium salt third sodium salt Example 1 8 5 5 3 3 Example 2 10 4 4 3 3 Example 3 10 4 4 3 3 Example 4 15 10 5 5 5 Example 5 20 2 2 2 2 Example 6 5 15 15 10 10 Comparative Example 1 2 20 1 1 11 Comparative Example 2 25 1 1 15 15

[0084] Test indicators and methods

[0085] Oxidation weight gain test: Under high-temperature conditions, the mass change of the roll surface due to oxidation is used to evaluate the antioxidant ability of the protective agent. Test method: At the simulated casting temperature (1400 °C), use a thermogravimetric analyzer to measure the mass change of the roll sample; calculate the oxidation weight gain rate ΔW = (mass of the sample after oxidation - mass of the sample before oxidation) / mass of the sample before oxidation × 100%, and the lower the value, the better the anti-oxidation effect.

[0086] Measurement of the thickness of the oxide layer: Measure the thickness of the oxide layer on the roll surface. The thinner the oxide layer, the better the protection effect. Test method: Use a metallurgical microscope to measure the thickness of the oxide layer, and then compare the effects of different antioxidants. Reference standard: Generally, the oxide layer thickness is required to be ≤ 100 μm.

[0087] Surface structure analysis: Detect the surface quality of the roll casting obtained by centrifugal casting and determine whether obvious oxidation defects appear on its surface. Test method: Use a scanning electron microscope (SEM) to observe whether there are defects such as scale, blisters, cracks, etc. on the roll surface.

[0088] Surface hardness HSD test: Obtained according to GB / T 4340.1. For ferroalloy rolls, generally, the required hardness HSD is 45 - 80. The larger the value, the greater the hardness.

[0089] The above test results are all shown in Table 2.

[0090] Table 2

[0091]

[0092]

[0093] From the above description, it can be seen that the above embodiments of the present invention achieve the preparation of an antioxidant composition for centrifugally cast alloy rolls with excellent performance. The obtained antioxidant composition can effectively prevent the oxidation of alloy materials during the centrifugal casting process, thereby improving the surface quality, structural uniformity, and various performance performances of the obtained castings, especially alloy rolls.

[0094] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order other than those described here, for example.

[0095] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An antioxidant composition for centrifugal casting alloy roll, characterized in that: The antioxidant composition for centrifugally cast alloy rolls comprises, by weight, 5 to 20 parts of zircon, 2 to 15 parts of colemanite, 2 to 15 parts of a first sodium salt, 2 to 10 parts of a second sodium salt, and 2 to 10 parts of a third sodium salt; The first sodium salt is a fluorine-containing sodium salt; The second sodium salt is a boron-containing sodium salt; The third sodium salt is selected from one or more of sodium carbonate, sodium hydroxide, sodium bicarbonate, sodium oxide and sodium chloride.

2. The antioxidant composition for centrifugally cast alloy roll according to claim 1, characterized in that: In parts by weight, the antioxidant composition for centrifugally cast alloy rolls comprises 5 to 15 parts of zircon, 2 to 10 parts of colemanite, 2 to 5 parts of the first sodium salt, 2 to 5 parts of the second sodium salt and 2 to 5 parts of the third sodium salt.

3. The antioxidant composition for centrifugally cast alloy roll according to claim 1 or 2, characterized in that: The fluorine-containing sodium salt is selected from one or more of sodium fluoride, sodium fluorosilicate, sodium fluoroaluminate, sodium fluorozirconate, sodium fluorotitanate and sodium hexafluorophosphate; and / or, The boron-containing sodium salt is selected from one or more of anhydrous borax, borax decahydrate, borax pentahydrate, sodium metaborate, sodium borate and sodium borosilicate.

4. The antioxidant composition for centrifugally cast alloy roll according to any one of claims 1 to 3, characterized in that: In parts by weight, the antioxidant composition for centrifugally cast alloy rolls comprises 8 to 10 parts of zircon, 4 to 5 parts of colemanite, 4 to 5 parts of the first sodium salt, 2 to 3 parts of the second sodium salt and 2 to 3 parts of the third sodium salt.

5. The antioxidant composition for centrifugally cast alloy roll according to any one of claims 1 to 4, characterized in that: The particle size of the antioxidant composition for centrifugally cast alloy rolls is 20 to 100 meshes.

6. Use of the antioxidant composition for centrifugally cast alloy rolls according to any one of claims 1 to 5 in a process for preparing alloy rolls, characterized in that: The alloy roll preparation process comprises the step of centrifugally casting a melt containing an antioxidant, wherein the antioxidant is an antioxidant composition for the centrifugally cast alloy roll.

7. The use according to claim 6, characterized in that: Calculated based on the total weight of the melt as 100%, the content of the antioxidant composition for the iron-containing centrifugal casting alloy roll is 10% to 15%.

8. The use according to claim 6 or 7, characterized in that: The preparation method of the alloy roll comprises: Step S1, melting alloy raw materials to obtain a first melt; Step S2, adding the antioxidant composition for centrifugally cast alloy roll into the first melt to obtain a second melt; Step S3, the second melt is subjected to centrifugal casting and cooling treatment in sequence to obtain the alloy roll.

9. The use according to claim 8, characterized in that: The temperature of the first melt is 1300°C to 1500°C.

10. The use according to claim 8 or 9, characterized in that: In the step S3, the rotation speed of the centrifugal casting is 800 rpm to 1000 rpm; and / or the cooling rate of the cooling treatment is 30° C. / min to 50° C. / min.

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