CN103880442B - Corundum-spinel pouring material and prepare the method for RH tubular stinger prefabricated component inner core - Google Patents
Corundum-spinel pouring material and prepare the method for RH tubular stinger prefabricated component inner core Download PDFInfo
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Abstract
The invention discloses a kind of unburned one-tenth Sialon combined corundum-spinel mould material and prepare the method for RH tubular stinger prefabricated component inner core.The raw material of this mould material consists of: fused white corundum 50 ~ 72%, spinel 8 ~ 21%, metallic silicon power 2 ~ 9%, 200 order fused white corundums 3 ~ 11%, Alpha-alumina 2 ~ 6% and ρ-aluminum oxide 3 ~ 7%; Add the additive FS60 accounting for various raw material gross weight 0.04 ~ 0.13% in addition.Mould material of the present invention adopts match dragon to combine, and the existence overcoming CaO in existing traditional mould material cement on the impact of prefabricated component high-temperature behavior and erosion-resisting characteristics, thus drastically increases hot strength and the thermal shock resistance of mould material of the present invention.And in conjunction with 1700 DEG C of working conditionss of this product, realize Sialon generation in use, effectively reduce production cost, make improve 30 ~ 50% the work-ing life of product.
Description
Technical field
The present invention relates to a kind of mould material, belong to fire resisting material field, be specifically related to a kind of corundum-spinel pouring material and prepare the method for RH tubular stinger prefabricated component inner core.
Background technology
Along with the development of smelting new technology (as Clean Steel production, ladle refining technique and continuous casting technology), more harsh requirement is proposed to the work-ing life of refractory materials.
RH vacuum degassing furnace is a liquid steel refining equipment between steel-making and continuous casting, its effect improves steel quality, meet and produce that IF steel etc. is highly difficult, the needs of high value added product in enormous quantities, major function has decarburization, deoxidation, degassed, desulfurization, alloying and composition adjustment, temperature adjustment etc.RH treatment process has the series of advantages such as refining efficiency is high, adaptation batch processing, equipment investment are few, easy to operate, is applied widely and remarkable break-throughs in STEELMAKING PRODUCTION.It can not only improve output of steel, improves steel product quality, increases kind, reduces costs, increase economic efficiency, and greatly optimize modern process for making.The eighties in 20th century, along with automotive industry is to the requirement increasingly stringent of steel quality, RH technology is developed rapidly.
The inwall lining brick of refining process RH tubular stinger is subject to the turbulent erosion of high velocity air and molten steel, and the mould material of outer wall is then by the harsh chemical effect of slag corrosion, alloying constituent, and mechanical force during scarfing cinder; Simultaneously the lining brick of soaking tub and mould material bear the stress impact of rapid heat cycle again, become the weak link of refining furnace.
And the interior pipe of RH soaking tub generally adopts accurate in size magnesia chrome brick to build by laying bricks or stones at present, fill with self-flowing material between magnesia chrome brick and steel construction, be welded with anchoring piece outside steel construction and pour into a mould corundum based refractory materials protected.Chromium sesquioxide in the impregnated tube liner magnesia chrome brick of soaking tub is not only expensive and have severe toxicity, all can cause serious harm to environment and human body, and its in use brickwork joint become weak link, easily corrode and come off; Building construction length consuming time.Therefore, the application of magnesia chrome brick does not also meet refractory materials sustainable development direction, constantly finds the focus that alternative refractory materials is industry research and concern always.
Wherein spinel becomes the first-selection of tubular stinger inner core material due to the high-temperature behavior of its excellence and thermal shock resistance, and domestic paid pilot production corundum spinel Chrome-free mould material and prefabricated component replace the research of magnesia chrome brick.Spinel in existing research technique has generated in-situ, has and directly adds electric smelting spinel fine powder.But at present general problems faced is poor containing its resistance to slag corrosion of mould material of chromium, thermal shock resistance, and the life-span is short, changes frequently, thus makes cost increase.
Meanwhile, in decades, the refractory materialss such as silicon nitride combined silicon carbide, Sialon silicon carbide and corundum brick are exhibited one's skill to the full in Iron And Steel Industry, imply that nitride ceramics has broad application prospects at fire resisting material field.But non-oxidized substance formation condition is harsh, the high cost caused, high energy consumption but affect its use at refractories industry.
At present, the bibliographical information in RH vacuum oven tubular stinger mould material used is also had.Such as: 1, application number is 201110441219.1, denomination of invention is " RH vacuum oven tubular stinger corundum pouring material and preparation method thereof ".Corundum pouring material disclosed in this patent of invention is made up of the component of following weight ratio: compact alumina 10 ~ 20 parts, white fused alumina 45 ~ 60 parts, white fused alumina micro mist 10 ~ 25 parts, 4 ~ 6 parts, electric molten magnesite powder, a-aluminum oxide powder 1 ~ 4 part, silicon powder 1 ~ 2 part, water reducer 0.2 part, additive 1 ~ 2 part, described additive is stainless steel steel fiber.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of corundum-spinel pouring material and prepare the method for RH tubular stinger prefabricated component inner core.Corundum-spinel pouring material of the present invention adopts Sialon to combine, and the existence overcoming CaO in existing traditional mould material cement on the impact of prefabricated component high-temperature behavior and erosion-resisting characteristics, thus drastically increases hot strength and the thermal shock resistance of material of the present invention.And in conjunction with 1700 DEG C of working conditionss of this product, realize Sialon generation in use, effectively reduce production cost, make improve 30 ~ 50% the work-ing life of product.
In order to solve the problem, the technical solution used in the present invention is:
The invention provides a kind of corundum-spinel pouring material, represent with weight percentage, the raw material of described corundum-spinel pouring material consists of: fused white corundum 50 ~ 72%, spinel 8 ~ 21%, metallic silicon power 2 ~ 9%, 200 order fused white corundums 3 ~ 11%, Alpha-alumina 2 ~ 6% and ρ-aluminum oxide 3 ~ 7%; Add additive FS60 in addition, the add-on of described additive FS60 accounts for above-mentioned various raw material gross weight 0.04 ~ 0.13%.
According to above-mentioned corundum-spinel pouring material, represent with weight percentage, described fused white corundum 50 ~ 72% is made up of 10 ~ 6mm fused white corundum 18 ~ 22%, 6 ~ 3mm fused white corundum 16 ~ 22%, 3 ~ 1mm fused white corundum 12 ~ 19% and 1 ~ 0mm fused white corundum 4 ~ 9%.
According to above-mentioned corundum-spinel pouring material, represent with weight percentage, described spinel 8 ~ 21% is made up of 1 ~ 0mm spinel 3 ~ 8%, 320 order spinel 3 ~ 7% and 5 μm of spinels 2 ~ 6%.
According to above-mentioned corundum-spinel pouring material, the granularity of described metallic silicon power is 0.074mm, and the granularity of described Alpha-alumina is 5 μm.
According to above-mentioned corundum-spinel pouring material, described additive FS60 is the polymer efficient additive produced by German BASF stock company, and its trade mark is FS60.
Utilize above-mentioned corundum-spinel pouring material to prepare a method for RH tubular stinger prefabricated component inner core, described preparation method is:
Various raw material is taken according to the ratio of above-mentioned mould material, various raw material is placed in stirrer for mixing even, add water in whipping process, the add-on of water accounts for 3.5 ~ 4.0% of each raw material gross weight, and after mixing, gained mould material being placed in grinding tool, to carry out vibrating casting shaping; After casting under 25 DEG C of conditions natural curing 48h, the demoulding, places 48h after the demoulding under 25 DEG C of conditions; Then under 250 ~ 280 DEG C of conditions, dry 24h, burnt till in nitriding furnace by the product obtained after oven dry, firing temperature is 1420 DEG C, and firing time is 35h; Be cooled to room temperature after burning till end to come out of the stove, obtain RH tubular stinger prefabricated component inner core.
Prepare the method for RH tubular stinger prefabricated component inner core according to the above-mentioned corundum-spinel pouring material that utilizes, described time of vibration is 25 ~ 35min.
positive beneficial effect of the present invention:
1, the present invention builds by laying bricks or stones on the basis of inner core application conditions and Wear cause according to current RH tubular stinger magnesia chrome brick, the excellent properties of comprehensive nitride, and adopt building construction easier, the more excellent prefabricated component of anti-erosion, antistrip performance is as inner core.Thus, the present invention improves by introducing nitride in mould material the technical recipe making prefabricated component corundum spinel castable used further, thus improve the thermal shock resistance of mould material of the present invention, high-temperature mechanical property and slag corrosion resistance and penetrating quality by means of the high heat conductance of nitride, low-expansion coefficient, higher toughness and the wettability difference to oxide slag, thus improve the work-ing life of product.
2, corundum-spinel pouring material of the present invention adopts match dragon to combine, the existence overcoming CaO in existing traditional mould material cement on the impact of prefabricated component high-temperature behavior and erosion-resisting characteristics, thus drastically increases hot strength and the thermal shock resistance of mould material of the present invention.And in conjunction with 1700 DEG C of working conditionss of this product, realize Sialon generation in use, effectively reduce production cost, make improve 30 ~ 50% the work-ing life of product.
3, different grain size (1-0mm is added in corundum-spinel pouring material formula of the present invention, 320 orders, 5 μm) electric smelting spinel, thus strengthen solid molten, the aluminum oxide of aluminum oxide and spinel and the solid molten and spinel of Sialon and the solid molten effect of Sialon, to improve the medium and high temperature strength of corundum-spinel pouring material further.
4, the present invention is in the formula of corundum-spinel pouring material, completely eliminated cement, silicon powder, ensureing wherein, on the basis of low temperature, achieves the High Purity of this system, overcomes CaO, SiO
2generate the composition of eutectic to the impact of its use properties Deng easily, effectively improve the resistance to slag corrosion of goods, perviousness and thermal shock performance.
5, technical solution of the present invention adopts ρ-Al respectively at normal temperature, middle temperature, high temperature
2o
3, alumina powder and Spinel micropowder the keying action of solid molten and Sialon, thus have effectively achieved corundum-spinel castable non-cement and without silicon powder.The more important thing is the environment for use condition by RH soaking tub uniqueness, by goods under the condition of 1420 DEG C of pre-nitriding process, achieve the generation of Sialon in conjunction with phase under working conditions, in the process used, product properties is not fallen to be increased on the contrary.And decrease the energy consumption of twice firing, significantly reduce the impact of Sialon combined fireproof material product energy consumption, cost.
Add the macromolecule dispersing agent FS60 that a kind of German BASF stock company produces in the formula of 6, corundum-spinel pouring material of the present invention, effectively improve mobility and the amount of water of mould material, thus eliminate ρ-Al
2o
3increase as the common amount of water of bonding agent, impact that the high and intensity of goods void content reduces.
embodiment:
Embodiment 1:
Corundum-spinel pouring material of the present invention, represent with weight percentage, raw material consists of: fused white corundum 62%, spinel 14%, metallic silicon power 3%, 200 order fused white corundums 11%, Alpha-alumina 3% and ρ-aluminum oxide 7%, add additive FS60 in addition, the add-on of additive FS60 accounts for 0.1% of above-mentioned various raw material gross weight.
Described fused white corundum 62% is made up of 10 ~ 6mm fused white corundum 18%, 6 ~ 3mm fused white corundum 22%, 3 ~ 1mm fused white corundum 16% and 1 ~ 0mm fused white corundum 6%;
Described spinel 14% is made up of 1 ~ 0mm spinel 5%, 320 order spinel 7% and 5 μm of spinels 2%; The granularity of described metallic silicon power is 0.074mm, and the granularity of described Alpha-alumina is 5 μm.
Embodiment 2:
The present invention utilizes corundum-spinel pouring material described in embodiment 1 to prepare the method for RH tubular stinger prefabricated component inner core, and described preparation method is:
Various raw material is taken according to the ratio of mould material described in embodiment 1, various raw material is placed in stirrer for mixing even, water is added in whipping process, the add-on of water accounts for 3.5 ~ 4.0% of each raw material gross weight, after mixing, gained mould material being placed in grinding tool, to carry out vibrating casting shaping, and time of vibration is 30min; After casting under 25 DEG C of conditions natural curing 48h, the demoulding, places 48h after the demoulding under 25 DEG C of conditions; Then under 260 DEG C of conditions, dry 24h, burnt till in nitriding furnace by the product obtained after oven dry, firing temperature is 1420 DEG C, and firing time is 35h; Be cooled to room temperature after burning till end to come out of the stove, obtain RH tubular stinger prefabricated component inner core.
The related performance indicators of the present embodiment products obtained therefrom: apparent porosity is 14.3%; Volume density is 3.19g.cm
-3; Linear change rate (1420 DEG C of nitrogenize 1h) is-0.25%; The anti-folding of normal temperature (110 DEG C) is 7.5MPa; Normal temperature is withstand voltage, and (110 DEG C) are 50.3MPa; The anti-folding of normal temperature (1200 DEG C) is 7.8MPa; Normal temperature is withstand voltage, and (1200 DEG C) are 52.4MPa; Hot anti-folding (1420 DEG C, nitrogenize 1h) is 22.0MPa; Hot withstand voltage (1420 DEG C, nitrogenize 1h) are 306MPa; Product work-ing life: 75 times.
The working conditions of product of the present invention:
Temperature: 1680-1720 DEG C, life requirements: > 60 times, refining time: 60-80min, produces steel grade: pipe line steel, manganese steel, axle steel.
Embodiment 3: substantially the same manner as Example 1, difference is:
Corundum-spinel pouring material of the present invention, represent with weight percentage, raw material consists of: fused white corundum 66%, spinel 12%, metallic silicon power 5%, 200 order fused white corundums 9%, Alpha-alumina 3% and ρ-aluminum oxide 5%, add additive FS60 in addition, the add-on of additive FS60 accounts for 0.08% of above-mentioned various raw material gross weight.
Described fused white corundum 66% is made up of 10 ~ 6mm fused white corundum 22%, 6 ~ 3mm fused white corundum 20%, 3 ~ 1mm fused white corundum 19% and 1 ~ 0mm fused white corundum 5%;
Described spinel 12% is made up of 1 ~ 0mm spinel 4%, 320 order spinel 4% and 5 μm of spinels 4%.
Embodiment 4: substantially the same manner as Example 2, difference is:
The present invention utilizes corundum-spinel pouring material described in embodiment 3 to prepare the method for RH tubular stinger prefabricated component inner core, identical with embodiment 2.
The related performance indicators of the present embodiment products obtained therefrom: apparent porosity is 14.0%; Volume density is 3.22g.cm
-3; Linear change rate (1420 DEG C of nitrogenize 1h) :-0.12%, the anti-folding of normal temperature (110 DEG C): 5.6MPa; Normal temperature is withstand voltage (110 DEG C): 42.5MPa; The anti-folding of normal temperature (1200 DEG C): 8.6MPa; Normal temperature is withstand voltage (1200 DEG C): 65.2MPa; Hot anti-folding (1420 DEG C, nitrogenize 1h): 26.5MPa; Hot withstand voltage (1420 DEG C, nitrogenize 1h): 324MPa; Product work-ing life: 82 times.
The working conditions of the present embodiment product:
Temperature: 1680-1720 DEG C, life requirements: > 60 times, refining time: 60-80min, produces steel grade: pipe line steel, manganese steel, axle steel.
Embodiment 5: substantially the same manner as Example 1, difference is:
Corundum-spinel pouring material of the present invention, represent with weight percentage, raw material consists of: fused white corundum 61%, spinel 17%, metallic silicon power 7%, 200 order fused white corundums 7%, Alpha-alumina 4% and ρ-aluminum oxide 4%, add additive FS60 in addition, the add-on of additive FS60 accounts for 0.06% of above-mentioned various raw material gross weight.
Described fused white corundum 61% is made up of 10 ~ 6mm fused white corundum 20%, 6 ~ 3mm fused white corundum 17%, 3 ~ 1mm fused white corundum 15% and 1 ~ 0mm fused white corundum 9%;
Described spinel 17% is made up of 1 ~ 0mm spinel 7%, 320 order spinel 4% and 5 μm of spinels 6%.
Embodiment 6: substantially the same manner as Example 2, difference is:
The present invention utilizes corundum-spinel pouring material described in embodiment 5 to prepare the method for RH tubular stinger prefabricated component inner core, identical with embodiment 2.
The related performance indicators of the present embodiment products obtained therefrom:
Apparent porosity: 13.4%, volume density: 3.28g.cm
-3linear change rate (1420 DEG C of nitrogenize 1h): 0.15%, the anti-folding of normal temperature (110 DEG C): 5.2MPa, normal temperature is withstand voltage (110 DEG C): 38.9MPa, the anti-folding of normal temperature (1200 DEG C): 8.9MPa, normal temperature is withstand voltage (1200 DEG C): 68.8MPa, hot anti-folding (1420 DEG C, nitrogenize 1h): 29.3MPa, hot withstand voltage (1420 DEG C, nitrogenize 1h): 352MPa, product work-ing life: 88 times.
The working conditions of product of the present invention:
Temperature: 1680-1720 DEG C, life requirements: > 60 times, refining time: 60-80min, produces steel grade: pipe line steel, manganese steel, axle steel.
Embodiment 7: substantially the same manner as Example 1, difference is:
Corundum-spinel pouring material of the present invention, represent with weight percentage, raw material consists of: fused white corundum 64%, spinel 14%, metallic silicon power 9%, 200 order fused white corundums 3%, Alpha-alumina 5% and ρ-aluminum oxide 5%, add additive FS60 in addition, the add-on of additive FS60 accounts for 0.04% of above-mentioned various raw material gross weight.
Described fused white corundum 64% is made up of 10 ~ 6mm fused white corundum 20%, 6 ~ 3mm fused white corundum 20%, 3 ~ 1mm fused white corundum 18% and 1 ~ 0mm fused white corundum 6%;
Described spinel 14% is made up of 1 ~ 0mm spinel 3%, 320 order spinel 6% and 5 μm of spinels 5%.
Embodiment 8: substantially the same manner as Example 2, difference is:
The present invention utilizes corundum-spinel pouring material described in embodiment 7 to prepare the method for RH tubular stinger prefabricated component inner core, identical with embodiment 2.
The related performance indicators of the present embodiment products obtained therefrom:
Apparent porosity: 14.2%, volume density: 3.18g.cm
-3, Linear change rate (1420 DEG C of nitrogenize 1h): 0.20%; The anti-folding of normal temperature (110 DEG C): 5.7MPa, normal temperature is withstand voltage (110 DEG C): 42.8MPa, the anti-folding of normal temperature (1200 DEG C): 9.1MPa, normal temperature is withstand voltage (1200 DEG C): 71.3MPa, hot anti-folding (1420 DEG C, nitrogenize 1h): 33.5MPa, hot withstand voltage (1420 DEG C, nitrogenize 1h): 371MPa, product work-ing life: 95 times.
The working conditions of product of the present invention:
Temperature: 1680-1720 DEG C, life requirements: > 60 times, refining time: 60-80min, produces steel grade: pipe line steel, manganese steel, axle steel.
Claims (5)
1. a corundum-spinel pouring material, it is characterized in that, represent with weight percentage, the raw material of described corundum-spinel pouring material consists of: fused white corundum 50 ~ 72%, spinel 8 ~ 21%, metallic silicon power 2 ~ 9%, 200 order fused white corundums 3 ~ 11%, Alpha-alumina 2 ~ 6% and ρ-aluminum oxide 3 ~ 7%; Add additive FS60 in addition, the add-on of described additive FS60 accounts for above-mentioned various raw material gross weight 0.04 ~ 0.13%;
Represent with weight percentage, described fused white corundum 50 ~ 72% is made up of 10 ~ 6mm fused white corundum 18 ~ 22%, 6 ~ 3mm fused white corundum 16 ~ 22%, 3 ~ 1mm fused white corundum 12 ~ 19% and 1 ~ 0mm fused white corundum 4 ~ 9%;
Represent with weight percentage, described spinel 8 ~ 21% is made up of 1 ~ 0mm spinel 3 ~ 8%, 320 order spinel 3 ~ 7% and 5 μm of spinels 2 ~ 6%.
2. corundum-spinel pouring material according to claim 1, is characterized in that: the granularity of described metallic silicon power is 0.074mm, and the granularity of described Alpha-alumina is 5 μm.
3. corundum-spinel pouring material according to claim 1, is characterized in that: described additive FS60 is the polymer efficient additive produced by German BASF stock company, and its trade mark is FS60.
4. utilize corundum-spinel pouring material described in claim 1 to prepare a method for RH tubular stinger prefabricated component inner core, it is characterized in that, described preparation method is:
Various raw material is taken according to the ratio of mould material described in claim 1, various raw material is placed in stirrer for mixing even, water is added in whipping process, the add-on of water accounts for 3.5 ~ 4.0% of each raw material gross weight, and after mixing, gained mould material being placed in grinding tool, to carry out vibrating casting shaping; After casting under 25 DEG C of conditions natural curing 48h, the demoulding, places 48h after the demoulding under 25 DEG C of conditions; Then under 250 ~ 280 DEG C of conditions, dry 24h, burnt till in nitriding furnace by the product obtained after oven dry, firing temperature is 1420 DEG C, and firing time is 35h; Be cooled to room temperature after burning till end to come out of the stove, obtain RH tubular stinger prefabricated component inner core.
5. the method utilizing corundum-spinel pouring material described in claim 1 to prepare RH tubular stinger prefabricated component inner core according to claim 4, is characterized in that: described time of vibration is 25 ~ 35min.
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| CN104496504B (en) * | 2015-01-06 | 2016-11-30 | 北京科技大学 | Cement rotary kiln matches grand combination fireproof magnesia alumina spinel material and preparation method |
| CN106365645A (en) * | 2015-02-11 | 2017-02-01 | 汤炼芳 | Burner prefab for calcining kiln and preparation method thereof |
| CN108373278B (en) * | 2018-01-29 | 2020-11-17 | 郑州市裕丰耐火材料有限公司 | Rod-shaped aggregate for lightweight castable and preparation method thereof |
| CN108911767B (en) * | 2018-07-27 | 2021-04-09 | 北京金隅通达耐火技术有限公司 | Corundum system unburned brick for key parts of RH refining furnace and preparation method thereof |
| CN112047747A (en) * | 2020-08-25 | 2020-12-08 | 贵阳明通炉料有限公司 | High-performance sialon corundum composite silicon carbide plastic and preparation method thereof |
| CN112028647A (en) * | 2020-08-25 | 2020-12-04 | 贵阳明通炉料有限公司 | High-performance sialon corundum plastic material and preparation method thereof |
| CN113943167B (en) * | 2021-12-02 | 2022-12-27 | 湖南湘钢瑞泰科技有限公司 | RH dip pipe castable and preparation method thereof |
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