CN108300850B - Composite steel tapping furnace kang structure for heating furnace and construction method thereof - Google Patents
Composite steel tapping furnace kang structure for heating furnace and construction method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/70—Furnaces for ingots, i.e. soaking pits
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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
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Abstract
The invention relates to a composite steel tapping furnace kang structure for a heating furnace and a construction method thereof, wherein the composite steel tapping furnace kang structure comprises a wear-resistant layer and a base layer arranged on the lower layer of the wear-resistant layer, the wear-resistant layer is formed by alternately building zirconium corundum bricks and chromium corundum bricks, and the brick number ratio of the chromium corundum bricks to the zirconium corundum bricks is 8: 2, the base layer is made of high-strength wear-resistant castable. The structure of the heated brick bed disclosed by the invention has the characteristics of high temperature resistance, high corrosion resistance, high wear resistance, high slag corrosion resistance, high thermal shock stability, high temperature, low creep property and the like, and good rapid cooling and rapid heating performance, can better meet the basic requirement of measuring the heating furnace at the high yield end, and the construction method of the heated brick bed structure has the advantages of simple structure, convenience in construction, simplicity and easiness in assembly and disassembly and lower maintenance cost.
Description
Technical Field
The invention relates to a composite steel tapping stove kang structure for a heating stove and a construction method thereof, which are applicable to the technical field of heating stove structural materials.
Background
The end-in side-out steel-pushing type heating furnace is the most main thermal equipment in the steel rolling process of the current steel manufacturing enterprises. The heating furnace is a continuous production, which puts high requirements on the performance of refractory materials. Particularly, on the steel tapping side, the working environment of the structural material of the heated brick bed of the steel tapping furnace is particularly severe, and the material is required to have the material characteristics of high temperature resistance, high corrosion resistance, high abrasion resistance, high slag corrosion resistance, high thermal shock stability, high temperature and low creep property and the like and better quenching and rapid heating performance. The traditional steel-tapping side furnace hearth structure generally adopts heat-resistant and wear-resistant steel, common chrome corundum bricks, high-strength wear-resistant castable and the like as furnace hearth materials. But with the continuous progress of the furnace type of the heating furnace, the furnace type is continuously increased; the size of the steel billet is continuously increased, the weight of the steel billet is continuously increased, and the traditional common furnace kang structure and application materials cannot meet the use requirements of the heating furnace.
Aiming at the problems of the structure of the steel tapping furnace kang of the end-in side-out push-steel type heating furnace, a large amount of research is carried out by enterprises and research institutions in China, and research results are provided from the material field and the furnace kang structure field respectively. The invention discloses a chromium corundum titanium brick and a production method thereof, wherein the invention aims to improve the slag corrosion resistance and the thermal shock stability of the material by adding titanium dioxide on the basis of the formula of the traditional chromium corundum brick from the material perspective. However, the invention does not consider the service life of the material from the viewpoint of wear resistance and structure. Meanwhile, a steel enterprise provides a composite steel tapping channel of a heat-resistant cast steel semi-hot plate and a cast iron water-cooled plate, the steel tapping channel is used as a heated brick bed, and has the advantages of long service life, convenience in replacement, simplicity in maintenance and the like. Is not suitable for large-scale popularization and application. Therefore, the steel tapping hearth structure of the domestic end-in side-out push-type heating furnace mainly adopts refractory materials with high wear resistance, and the main research direction is to adopt a composite steel tapping structure and a composite refractory material.
Disclosure of Invention
The invention provides a composite steel tapping hearth structure for a heating furnace, which has the material characteristics of high temperature resistance, high corrosion resistance, high wear resistance, high slag corrosion resistance, high thermal shock stability, high temperature and low creep property, better quenching and quick heating performance and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a heating furnace is with compound tapping stove heatable brick bed structure, includes wearing layer and the basal layer of setting in wearing layer lower floor, the wearing layer is alternately built by laying bricks or stones by zirconium corundum brick and chromium corundum brick and is formed, the brick number proportion of chromium corundum brick and zirconium corundum brick is 8: 2, the base layer is made of high-strength wear-resistant castable.
Furthermore, the hearth structure is positioned at the steel tapping side of the heating furnace, the total width of the hearth structure is 500-700 mm, the length of the hearth structure is 7000-10000 mm, the thickness of the hearth structure is 1000-1200 mm, the working temperature range is 1150-1450 ℃, and the volume density of the hearth structure is 2.4-4.1 cm3The Mohs hardness is 6.5-9.0, and the abrasion loss is 0.05-0.1 square meter per kg.
Further, the thickness of the wear-resistant layer is 260-320 mm, the length is 7000-10000 mm, the working temperature range is 1150-1450 ℃, and the volume density is 3.2-4.1 cm3The Mohs hardness is 8.5-9.0, the abrasion loss is 0.05 square meter per kg, and the compressive strength is 140-200 Mpa.
Further, the thickness of the base layer is 680-980 mm, the length is 7000-10000 mm, the tolerance temperature range is 650-950 ℃, and the volume density is2.5—2.7cm3The Mohs hardness is 5.5-6.0, the abrasion loss is 0.08 square meter per kg, and the compressive strength is 50-70 Mpa.
Furthermore, the zirconia corundum brick is an electric melting-casting zirconia corundum brick, is manufactured by adopting a non-shrinkage-seam casting technology, and is mainly formed by uniformly mixing alumina powder, zirconia powder and silicon dioxide, melting by using an electric melting furnace, injecting into a model, and cooling.
Furthermore, the volume density of the zirconia-corundum brick is 3.75-4.1 cm3the Mohs hardness is not less than 9.0, the abrasion loss is 0.05 square meter per kg, and the compressive strength is 180-200 Mpa.
Furthermore, the chrome corundum brick is an electric smelting-reburning chrome corundum brick, which is prepared by taking alpha-Al 2O3 powder, electric smelting white corundum and electric smelting brown corundum as basic raw materials, adding chromium oxide powder and bauxite clinker fine powder, pressing and molding through a 1200-ton press, and then firing at 1780 ℃ at high temperature.
Furthermore, the volume density of the chromium corundum brick is 3.2-3.4 cm3The Mohs hardness is 8.5-9.0, the abrasion loss is 0.05 square meter per kg, and the compressive strength is 140-160 Mpa.
Further, the high-strength wear-resistant castable is composed of a high-strength magnesium-chromium mineral aggregate, bauxite powder and a high polymer, wherein the grain size of the high-strength magnesium-chromium mineral aggregate is 5-8 mm, and the grain size of the bauxite powder is 30-50 meshes.
The invention also provides a construction method of the composite steel tapping hearth structure for the heating furnace, and the construction method of the hearth structure has the comprehensive advantages of low labor cost, low management cost, simple and quick construction process, easy purchase of construction materials, low maintenance cost and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows: a construction method of a composite steel tapping stove kang structure for a heating furnace mainly comprises the following steps:
(1) Integral casting: taking the concrete at the bottom of the heating furnace as a base layer and taking the kiln wall of the heating furnace as a lateral mold, and integrally pouring the high-strength wear-resistant castable for the base layer;
(2) and (4) heat preservation and maintenance: after pouring, carrying out heat preservation maintenance on the foundation layer, wherein the maintenance temperature is 5-30 ℃, and the maintenance time is 10-15 days;
(3) Horizontal adjustment: after the base layer is hardened, the high-strength wear-resistant castable micro powder is used for horizontal adjustment, so that the integral height difference of the upper surface of the base layer is less than or equal to 1 mm;
(4) Building a wear-resistant layer: and building the zirconium corundum bricks and the chromium corundum bricks on the foundation layer to form a wear-resistant layer.
By adopting the technical scheme, the furnace kang structure disclosed by the invention has the characteristics of high temperature resistance, high corrosion resistance, high wear resistance, high slag corrosion resistance, high thermal shock stability, high temperature and low creep property and other materials and better quenching and quick heating performance, and can better meet the basic requirements of high-yield end-to-end measurement of the heating furnace. The service life of the furnace kang structure is far longer than that of any existing tapping furnace kang structure, and the design basic service life is 18-24 months. In particular, the foundation layer of the oven bed structure is a permanent layer, which usually does not need to be replaced. And the change of abrasive brick only need put tapping hole one side down, by the pusher with zirconia corundum brick and chrome corundum brick release in proper order can, when reinstalling, with two kinds of bricks push in proper order can, have simple structure, construction convenience, dismouting simple and easy, the lower advantage of maintenance cost.
drawings
FIG. 1 is a front sectional view of a composite steel tapping heated brick bed structure for a heating furnace according to the present invention;
FIG. 2 is a sectional top view of a composite steel tapping heated brick bed structure for a heating furnace according to the present invention;
FIG. 3 is a sectional side view of a composite steel tapping heated brick bed structure for a heating furnace according to the present invention;
In the figure: 1. the steel plate comprises a wear-resistant layer, 2 a base layer, 3 zirconium corundum bricks, 4 chromium corundum bricks, 5 steel billets, 6 steel tapping holes, 7 and a heating furnace kiln wall.
Detailed Description
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
Example 1:
As shown in fig. 1-3, a composite steel tapping hearth structure for a heating furnace comprises a wear-resistant layer 1 and a base layer 2 arranged on the lower layer of the wear-resistant layer 1, wherein the wear-resistant layer 1 is formed by alternately building zirconium corundum bricks 3 and chromium corundum bricks 4, and the brick number ratio of the chromium corundum bricks 3 to the zirconium corundum bricks 4 is 8: 2, the base layer 2 is made of high-strength wear-resistant castable.
The structure of the furnace kang is positioned at the steel tapping side of the heating furnace, the total width of the structure is 500-700 mm, the length is 7000-10000 mm, the thickness is 1000-1200 mm, the working temperature range is 1150-1450 ℃, and the volume density is 2.4-4.1 cm3the Mohs hardness is 6.5-9.0, and the abrasion loss is 0.05-0.1 square meter per kg.
The thickness of the wear-resistant layer 1 is 260-320 mm, the length is 7000-10000 mm, the working temperature range is 1150-1450 ℃, and the volume density is 3.2-4.1 cm3The Mohs hardness is 8.5-9.0, the abrasion loss is 0.05 square meter per kg, and the compressive strength is 140-200 Mpa.
Specifically, the wear-resistant layer 1 is a steel layer, the steel billets 5 of all heating furnaces are laterally scratched into the layer after retreating, and then are axially pushed out of the furnace body through the layer, and the layer is in direct contact with the steel billets 5, so that the wear-resistant layer has the basic characteristics of high temperature, high pressure, high wear resistance and the like. The wear-resistant layer 1 is slightly higher than the level of the steel tapping hole 6, and the height difference is preferably 3-5 mm.
The thickness of the base layer 2 is 680-980 mm, the length is 7000-10000 mm, the tolerance temperature range is 650-950 ℃, and the volume density is 2.5-2.7 cm3The Mohs hardness is 5.5-6.0, the abrasion loss is 0.08 square meter per kg, and the compressive strength is 50-70 Mpa.
Specifically, the base layer 2 is a structural load-bearing layer which is required to bear the sum of the weights of the steel billet 5 and the wear-resistant layer 2, and has high compressive strength and low linear shrinkage ratio.
The zirconia corundum brick 3 is an electric melting-casting zirconia corundum brick, the zirconia corundum brick 3 is manufactured by adopting a non-shrinkage-seam casting technology, and is mainly formed by uniformly mixing alumina powder, zirconia powder and silicon dioxide, melting by using an electric melting furnace, injecting into a model and cooling.
the zircon corundum block 3 is a white solid refractory material, and the rock phase structure thereof consists of eutectoid bodies of corundum and baddeleyite and a glass phase, namely eutectoid bodies of corundum phase and baddeleyite phase, and the glass phase is filled between crystals of the corundum phase and the baddeleyite phase. The brick has high compactness, glass phase surface and low friction coefficient, and mainly plays a role in assisting sliding.
The volume density of the zirconia-corundum brick 3 is 3.75-4.1 cm3The Mohs hardness is not less than 9.0, the abrasion loss is 0.05 square meter per kg, and the compressive strength is 180-200 Mpa.
The chrome corundum brick 4 is an electric smelting-reburning chrome corundum brick, and the chrome corundum brick 4 is prepared by using alpha-Al 2O3 powder, electric smelting white corundum and electric smelting brown corundum as basic raw materials, adding chromium oxide powder and bauxite clinker fine powder, pressing and molding through a 1200-ton press, and then firing at 1780 ℃ at high temperature.
The chromium corundum brick 4 is a solid refractory material with a brick body in a dark purple color, and the rock phase structure of the brick is composed of eutectoid of corundum and chromium oxide powder and a vitreous phase, namely eutectoid of corundum phase and chromium oxide powder phase. The brick has higher density and mainly plays a role in resisting wear in the structure of the heated brick bed.
the volume density of the chromium corundum brick 4 is 3.2-3.4 cm3the Mohs hardness is 8.5-9.0, the abrasion loss is 0.05 square meter per kg, and the compressive strength is 140-160 Mpa.
The high-strength wear-resistant castable is composed of a high-strength magnesia-chrome mineral aggregate, bauxite powder and a high polymer, wherein the grain size of the high-strength magnesia-chrome mineral aggregate is 5-8 mm, and the grain size of the bauxite powder is 30-50 meshes. The high-strength wear-resistant castable has the advantages of minimum wear-resistant loss, high strength, randomly controllable shape, strong integrity, simple loading and unloading, simple construction, good construction performance and the like.
Specifically, the high molecular polymer is phosphate.
Example 2:
A construction method of a composite steel tapping stove kang structure for a heating furnace mainly comprises the following steps:
(1) integral casting: taking the concrete at the bottom of the heating furnace as a bottom and the kiln wall 7 of the heating furnace as a lateral mold, and integrally pouring the high-strength wear-resistant castable for the foundation layer;
(2) And (4) heat preservation and maintenance: after pouring is finished, carrying out heat preservation maintenance on the foundation layer 2, wherein the maintenance temperature is 5-30 ℃, and the maintenance time is 10-15 days;
(3) Horizontal adjustment: after the base layer 2 is hardened, the high-strength wear-resistant castable micro powder is used for horizontal adjustment, so that the integral height difference of the upper surface of the base layer 2 is less than or equal to 1 mm;
(4) Building a wear-resistant layer 1: and building the zirconium corundum bricks 3 and the chromium corundum bricks 4 on the foundation layer 2 to form the wear-resistant layer 1.
In the step (3), the high-strength wear-resistant castable micropowder comprises silica micropowder with the particle size of 100-150 meshes and alumina micropowder with the particle size of 200-300 meshes.
In the step (4), the inter-building method adopted by the wear-resistant layer 1 is dry pendulum building, refractory slurry is not used, the wear-resistant layer 1 mainly comprises the chromium corundum bricks 4, the zirconium corundum bricks 3 are used as accessories, and the brick number ratio of the chromium corundum bricks 4 to the zirconium corundum bricks 3 is 8: 2, wherein the zirconia-corundum bricks 3 are separately placed, and the total span is more than or equal to the length of the steel billet 5.
Particularly, 1-2 chromium corundum bricks 4 are built at the central line position in the length direction of the heated brick bed structure.
In particular, 1-2 blocks of the wear-resistant layer 1 adjacent to the steel outlet are made of chromium corundum bricks 4.
Example 3:
taking the width direction of the steel billet 5 as the longitudinal direction and the length direction of the steel billet 5 as the axial direction, the length and width dimensions of the oven hearth structure are all larger than the dimensions of the steel billet 5, in this embodiment, a heating furnace for producing a carbon steel square billet of 140 × 140 × 6000 mm is taken as an implementation object, and the dimension of the oven hearth structure itself is preferably 1000 mm (height) × 580 mm (width) × 7000 mm (length).
In this embodiment, preferably, the thickness of the wear-resistant layer 1 of the oven hearth structure is 280 mm, the thickness of the base layer 22 is 720 mm, and the total thickness of the oven hearth is equal to 1000 mm of the total height of the oven hearth. Wherein the wear-resistant layer 1 is formed by building chrome corundum bricks 4 and zirconium corundum bricks 3 in blocks, and the foundation layer 2 is integrally cast by high-strength casting materials.
In this embodiment, when the carbon steel square billet arrived stove heatable brick bed structure position, its steel billet 5 self temperature was about 1200 ℃, and furnace ambient temperature is more than 1000 ℃, and chromium corundum brick 4 and the zirconia corundum brick 3 that this embodiment wearing layer 1 adopted endure the temperature and are more than 1650 ℃, have good soft performance of resistance to loading and high temperature low creep property, can satisfy the production demand completely, be this embodiment preferred scheme.
In this embodiment, the sizes of the zirconia corundum brick 3 and the chrome corundum brick 4 of the wear-resistant layer 1 of the oven hearth structure are consistent, and according to the size of the oven hearth structure, the sizes of the zirconia corundum brick 3 and the chrome corundum brick 4 are preferably 280 mm (high) x 580 mm (wide) x 348 mm (long), the height of the brick is preferably equal to the thickness of the wear-resistant layer of the oven hearth structure, and the width of the brick is equal to the width of the wear-resistant layer of the oven hearth structure. Preferably, the total quantity of the zirconia-corundum bricks 3 and the chrome-corundum bricks 4 is 20, and the total length of the brick body is 6960 mm. In consideration of the thermal expansion and cold contraction performance of the material, the expansion joint between the brick bodies is preferably 21, the total thickness is 40 mm, the expansion coefficient is 0.5%, and the sum of the length of the brick bodies and the length of the expansion joint is equal to the length of the heated brick bed structure.
in the embodiment, the method for building the zirconium corundum bricks 3 and the chromium corundum bricks 4 of the wear-resistant layer 1 of the oven kang structure is to separately and indirectly build two brick types, 6 zirconium corundum bricks 3 and 14 chromium corundum bricks 4 are preferably selected in the embodiment of the scheme. In the aspect of building, considering that the density of the chromium steel jade brick 4 is smaller, the quenching and quick heating performance is better than that of the chromium steel jade brick 4, and the temperature difference between the two furnace door openings of the heating furnace is larger, the chromium steel jade brick 4 is preferably built by using bricks for a furnace hearth structure close to the furnace door opening, and in the embodiment, the furnace hearth structure with the length of 700mm from the two furnace door openings to the center in the furnace is preferably built by respectively building 2 chromium steel jade bricks 4, and the total length is 1400 mm. The rest 5600 mm furnace hearth structure length is slightly shorter than the billet 5 length, 2 zirconium corundum bricks are preferably respectively built at the edge positions and the center line position of the two sides of the furnace hearth structure length, and the total length is 2100 mm. And the rest of the furnace kang structure is partially built with chrome corundum bricks 4.
In the embodiment, considering the problems of small size, light weight and comprehensive cost of the billet 5, the zirconium corundum brick 3 with the trademark of AZS-36Y is preferably manufactured by a seamless casting technology, has the Mohs hardness of more than or equal to 9.0, the abrasion loss of 0.05 square meters per kg and the compressive strength of more than 180, can meet the requirement of long-term abrasion of the billet 5, but has the volume density which is about 10 percent lighter than that of AZS-41Y, and has good economical efficiency and low energy consumption.
In the present embodiment, considering the problems of small size, light weight and comprehensive cost of the billet 5, the billet is preferably formed by pressing through a 1200 ton press and sintered at 1780 ℃ under the brand nameGGZ-12 chromium corundum brick 4 with volume density of 3.2cm3The steel billet has the advantages that the steel billet can meet the requirement of long-term abrasion of the steel billet 5, the volume density is about 8.5 percent lighter than GGZ-20, and the steel billet has good economical efficiency and low energy consumption.
In the embodiment, under the condition of producing 140 square billets, the zirconium corundum bricks 3 and the chromium corundum bricks 4 with lighter body density are adopted, and the total weight is relatively reduced by about 9 percent. But the service life is not changed, and the longest service life can reach about 24 months.
In this embodiment, the preferred grain size formula of the high-strength wear-resistant castable used for the hearth structure foundation layer is 8mm of the grain size of the high-strength magnesium-chromium mineral aggregate, 30 meshes of the bauxite powder, 150 meshes of the silica powder and 220 meshes of the alumina powder. It can withstand temperature above 750 deg.C, and has volume density of 2.7cm3More than g, the Mohs hardness is about 6.0, the abrasion loss is about 0.08 square meter per kg, and the compressive strength is about 65 Mpa.
In this embodiment, the preferable construction foundation of the oven kang structure is a hard soil layer or a concrete layer with a designation of C45 or more, wherein the thickness of the hard soil layer is not less than 3 m, and the thickness of the concrete layer is not less than 1.5 m. Further, the preferred embodiment of the present invention is a concrete foundation with a thickness of 1.5 m.
in this embodiment, the preferable construction stage of the furnace kang structure is that after the furnace wall structure and the furnace body foundation are completed, the furnace wall structure and the furnace body foundation structure can be used as a pouring bottom mold and a side mold without re-molding.
In this embodiment, the preferable construction season of the oven kang structure is autumn and winter, and the dry weather is easy for the base layer to harden, but considering the temperature problem in winter, the preferable construction temperature range is 5-30 ℃.
In this embodiment, the wear-resistant layer of the heated brick bed structure is slightly higher than the steel-tapping hole by 6, and preferably, the higher positive tolerance is 5mm, so that the overall service life of the heated brick bed structure can be prolonged, the base layer 2 can be settled to a certain extent under the conditions of high temperature and high pressure, the overall settlement height is about 6-8 mm, and the higher positive tolerance can just compensate the settlement height.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The utility model provides a heating furnace is with compound tapping stove heatable brick bed structure which characterized in that: including wearing layer and the basal layer of setting in wearing layer lower floor, the wearing layer is built by laying bricks or stones alternately by zirconium corundum brick and chromium corundum brick and is formed, the brick number proportion of chromium corundum brick and zirconium corundum brick is 8: 2, the basic layer is made of high-strength wear-resistant castable, the hearth structure is positioned on the steel tapping side of the heating furnace, the overall width of the hearth structure is 500-700 mm, the length of the hearth structure is 7000-10000 mm, the thickness of the hearth structure is 1000-1200 mm, the working temperature range is 1150-1450 ℃, and the volume density of the hearth structure is 2.4-4.1 cm3g, Mohs hardness of 6.5-9.0, abrasion loss of 0.05-0.1 m2The thickness of the wear-resistant layer is 260-320 mm, the length is 7000-10000 mm, the working temperature range is 1150-1450 ℃, and the volume density is 3.2-4.1 cm3(ii) a Mohs hardness of 8.5 to 9.0 and an abrasion loss of 0.05m2Kg, 140-200 Mpa of compressive strength, 680-980 mm of thickness of the base layer, 7000-10000 mm of length, 650-950 ℃ of temperature tolerance range and 2.5-2.7 cm of bulk density3(ii) g, Mohs hardness of 5.5-6.0, and abrasion loss of 0.08 m2The zirconia corundum brick is an electrofusion-casting zirconia corundum brick, is manufactured by adopting a non-shrinkage-seam casting technology, is mainly prepared by uniformly mixing alumina powder, zirconia powder and silicon dioxide, is melted by an electric smelting furnace and then is injected into a model for cooling, and has the volume density of 3.75-4.1 cm3G, Mohs hardness is more than or equal to 9.0, and abrasion loss is 0.05m2Kg, compressive strength of 180-200 MPa, the chromium corundum brick is an electric melting-reburning chromium corundum brickThe chromium corundum brick is prepared by using alpha-Al 2O3 powder, electric smelting white corundum and electric smelting brown corundum as basic raw materials, adding chromium oxide powder and bauxite clinker fine powder, pressing and molding by a 1200-ton press, and firing at 1780 ℃ at high temperature, wherein the volume density of the chromium corundum brick is 3.2-3.4 cm3(ii) g, Mohs hardness of 8.5-9.0, and abrasion loss of 0.05m2The high-strength wear-resistant castable is composed of high-strength magnesium-chromium mineral aggregate, bauxite powder and a high polymer, wherein the grain diameter of the high-strength magnesium-chromium mineral aggregate is 5-8 mm, and the grain diameter of the bauxite powder is 30-50 meshes.
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