CN112743071A - high-Cr alloy steel drainage sand and use method thereof - Google Patents
high-Cr alloy steel drainage sand and use method thereof Download PDFInfo
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- CN112743071A CN112743071A CN202011615328.6A CN202011615328A CN112743071A CN 112743071 A CN112743071 A CN 112743071A CN 202011615328 A CN202011615328 A CN 202011615328A CN 112743071 A CN112743071 A CN 112743071A
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- sand
- drainage sand
- drainage
- steel
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- 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
- B22D41/48—Meltable closures
Abstract
The high Cr alloy steel drainage sand and the adding method thereof are characterized in that: the weight percentage of the drainage sand is SiO2≥75%，H2O is less than or equal to 0.5 percent, the proportion of the granularity of 0.45-1.5 mm is more than 95 percent, and the refractoriness is more than or equal to 700 ℃; the refractory mortar comprises zirconium diversion sand Cr2O3=28% -32%, SiO2=24% -28%, ZrO2=10% -14%, H2O is less than or equal to 0.5%, and the refractoriness is greater than or equal to 1900 ℃; the ratio of the particle size of the chromium-silicon drainage sand to the particle size of 0.08-1.2 mm is more than 95 percent; the lower layer of the drainage sand is zirconium drainage sand, and the addition mass of the zirconium drainage sand is 28-42 Kg/heat; the upper layer of the drainage sand is siliceous drainage sand, and the mass of the drainage sand added is 9-16 kg/heat; the siliceous stuffing sand is contacted with the zircon stuffing sand, and the addition is based on the condition that the siliceous stuffing sand completely covers the zircon stuffing sand; the drainage sand is added within 30min before the steel ladle contains steel. The adding method has the advantages of simple operation, easily obtained materials and low cost, the automatic casting rate of the molten steel reaches 98-100%, inclusions in the molten steel are reduced, the purity of the molten steel is improved, and the modification loss of high-quality steel is reduced.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to high-Cr alloy steel drainage sand and an adding method thereof.
Background
In the steelmaking production, the drainage sand is used for plugging a flow injection hole at the bottom of a steel ladle at a drainage position and is an essential refractory material for the steel ladle. Generally, before the molten steel is poured into a ladle, the pouring hole is blocked by using the drainage sand, and then the molten steel is poured. The powdery stuffing sand filled in the upper nozzle of the ladle can become a two-layer structure under the condition of high-temperature contact of molten steel: the side close to the molten steel is a sintered layer, and the side far away from the molten steel is kept as the original shape and still is a powder layer. The sintered layer has certain strength, part of the molten steel enters into the gap of the sintered layer to be solidified, the sintered layer plays a role in sealing and blocking the molten steel, and the powder layer only plays a role in filling a water feeding port of the ladle. In the actual production process, in order to ensure the self-opening rate of the steel ladle, the commonly used drainage sand is mainly siliceous, chromic or zirconium.
At present, high-quality molten steel is almost poured after being refined in an LF furnace and in vacuum, but due to special requirements of molten steel components, the refining working conditions are complex, and the following problems can be caused: firstly, the refining time of molten steel is long, for example, smelting of special steel such as high Cr alloy steel and the like easily causes the sintered layer of the drainage sand to be too thick; secondly, the time of the molten steel in the ladle is long, and due to uncontrollable property, the time of partial molten steel in the steel grade is basically more than 4 hours, so that the sintered layer of the drainage sand is too thick. The problems are easy to influence the automatic casting rate of the ladle nozzle drainage sand.
Disclosure of Invention
The invention aims to provide the high-Cr alloy steel drainage sand and the adding method thereof, which can improve the automatic casting rate of the high-Cr alloy steel, reduce oxygen consumption and inclusions in molten steel, improve the purity of the molten steel and effectively ensure the safe and smooth operation of a continuous casting process.
The technical scheme for realizing the purpose is as follows:
the high Cr alloy steel drainage sand is prepared from (by weight) siliceous drainage sand SiO2 not less than 75, H2O not more than 0.5, granularity 0.45-1.5 mm more than 95%, and refractoriness not less than 700 deg.C; the refractory mortar is characterized in that the refractory mortar is prepared from zirconium diversion sand Cr2O3= 28-32, SiO2= 24-28, ZrO2= 10-14, H2O is less than or equal to 0.5, and the refractoriness is more than or equal to 1900 ℃; the ratio of the particle size of the chromium-silicon drainage sand to the particle size of 0.08-1.2 mm is more than 95 percent; the lower layer of the drainage sand is zirconium drainage sand, and the added mass is 28-42 kg/heat; the upper layer of the drainage sand is siliceous drainage sand, and the mass of the drainage sand added is 9-16 kg/heat; the siliceous stuffing sand is contacted with the zircon stuffing sand, and the addition is based on the condition that the siliceous stuffing sand completely covers the zircon stuffing sand; the drainage sand is added within 30min before the steel ladle contains steel.
The number of times of using the ladle nozzle
When the addition time is 15 times, the adding mass of the siliceous drainage sand is 9-11 kg; when the using times of the ladle top nozzle is more than 15 times, the adding mass of the siliceous drainage sand is 14-16 kg; the number of times of using the ladle nozzle
When the treatment is carried out for 10 times, the adding mass of the zirconium drainage sand is 28-32 kg; when the using times of the ladle top nozzle is 11-25 times, the adding mass of the zirconium drainage sand is 33-37 kg; when the using times of the ladle upper nozzle is more than 25, the adding mass of the zirconium drainage sand is 38-42 kg. The method for adding the high Cr alloy steel drainage sand comprises the step of adding the high Cr alloy steel drainage sand within 30min before steel is contained in a steel ladle.
The invention adopts double-layer flow guiding sand, the upper layer of which has less siliceous flow guiding sand directly contacts with the molten steel, the refractoriness is low, a thinner sintering layer is easily and rapidly formed in the tapping process, and the molten steel is prevented from further permeating into the lower layer of flow guiding sand. The lower layer of the zircon drainage sand has high refractoriness and good sintering resistance, the thickness of a sintering layer can be controlled in the subsequent smelting temperature rise process, the appropriate thickness of the sintering layer of the drainage sand is generally ensured, and when a ladle is opened for casting, the sintering layer is crushed under the action of hydrostatic pressure of molten steel, so that automatic drainage is realized. The adding method disclosed by the invention is simple to operate, the materials are easy to obtain, the cost is low, the automatic casting rate of the molten steel reaches 98-100%, inclusions in the molten steel are reduced, the purity of the molten steel is improved, and the judgment loss of high-quality steel is reduced.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example 1: smelting plate 12Cr2Mo1R steel drainage sand and adding method thereof
The steel comprises, by weight, C = 0.13-0.15%, Si = 0.04-0.08%, Mn = 0.40-0.60%, P ≤ 0.006%, Cr = 2.20-2.50%, Mo = 0.90-1.00%, and the balance trace elements and inevitable impurities. The steel smelting process flow comprises converter boiling tapping, LF dephosphorization, slagging, LF deoxidation slagging, alloying, RH furnace vacuum treatment and slab continuous casting.
The drainage sand and the adding method thereof are as follows: selecting a ladle with the number of times of feeding water gaps as 18, adding 35Kg of zircon stuffing sand containing SiO in percentage by weight into the feeding water gaps of the ladle when the distance between the ladle and the converter tapping is 15min2=26.22、Cr2O3=30.73、ZrO2=12.08、H2O =0.09, refractoriness 1732 ℃. Then adding 15kg of siliceous stuffing sand which comprises SiO in percentage by weight on the upper layer of the zirconia stuffing sand2=80.6、H2O =0.21, refractoriness 760 ℃. The furnace starts tapping from a converter to ladle casting, the duration of molten steel in the ladle is 4.6 hours, and the treatment temperature is 1540-1640 ℃.
When the ladle sliding plate is opened to prepare casting, the drainage sand which is not sintered at the lower layer flows downwards, the static pressure of molten steel crushes the sintered layer at the upper layer, the molten steel flows out smoothly, and automatic casting is realized.
Example 2: smelting plate 12Cr2Mo1R steel drainage sand and adding method thereof
The steel comprises the following chemical components, by weight, 0.13-0.15% of C = 0.13-0.15%, 0.04-0.08% of Si = 0.40-0.60%, 0.006% or less of P, 2.20-2.50% of Cr, 0.90-1.00% of Mo, and the balance of trace elements and inevitable impurities. The process flow comprises converter boiling tapping, LF dephosphorization, slagging, LF deoxidation slagging, alloying, RH furnace vacuum treatment and slab continuous casting.
The drainage sand and the adding method thereof are as follows: selecting a ladle with 32 times of water feeding holes, adding 40kg of zircon stuffing sand containing SiO in percentage by weight into the water feeding holes of the ladle when the distance between the ladle and the converter tapping is 22min2=25.62、Cr2O3=29.04、ZrO2=11.57、H2O =0.11, refractoriness 1956 ℃. Then continuously adding siliceous drainage on the upper layer of the zircon drainage sand15kg of sand containing SiO in percentage by weight2=81.38、H2O =0.13, refractoriness 754 ℃. The furnace starts tapping from a converter to ladle casting, the time of molten steel in the ladle is 5.2 hours, and the treatment temperature is 1540-1640 ℃.
When the ladle sliding plate is opened to prepare casting, the drainage sand which is not sintered at the lower layer flows downwards, the static pressure of molten steel crushes the sintered layer at the upper layer, the molten steel flows out smoothly, and automatic casting is realized.
Claims (2)
1. The high Cr alloy steel drainage sand and the adding method thereof are characterized in that: according to the weight percentage, the siliceous drainage sand SiO2 is not less than 75, the H2O is not more than 0.5, the proportion of the particle size of 0.45-1.5 mm is more than 95 percent, and the refractoriness is not less than 700 ℃; the refractory mortar is characterized in that the refractory mortar is prepared from zirconium diversion sand Cr2O3= 28-32, SiO2= 24-28, ZrO2= 10-14, H2O is less than or equal to 0.5, and the refractoriness is more than or equal to 1900 ℃; the ratio of the particle size of the chromium-silicon drainage sand to the particle size of 0.08-1.2 mm is more than 95 percent; the lower layer of the drainage sand is zirconium drainage sand, and the added mass is 28-42 kg/heat; the upper layer of the drainage sand is siliceous drainage sand, and the mass of the drainage sand added is 9-16 kg/heat; the siliceous stuffing sand is contacted with the zircon stuffing sand, and the addition is based on the condition that the siliceous stuffing sand completely covers the zircon stuffing sand; the drainage sand is added within 30min before the steel ladle contains steel.
2. The high Cr alloy steel drainage sand and the adding method thereof according to claim 1, wherein the high Cr alloy steel drainage sand comprises the following components in percentage by weight: the number of times of using the ladle nozzle
When the addition time is 15 times, the adding mass of the siliceous drainage sand is 9-11 kg; when the using times of the ladle top nozzle is more than 15 times, the adding mass of the siliceous drainage sand is 14-16 kg; the number of times of using the ladle nozzle
When the treatment is carried out for 10 times, the adding mass of the zirconium drainage sand is 28-32 kg; when the using times of the ladle top nozzle is 11-25 times, the adding mass of the zirconium drainage sand is 33-37 kg; when the using times of the ladle nozzle is more than 25, the zirconium drainage sandThe mass of the additive is 38-42 kg.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011615328.6A CN112743071A (en) | 2020-12-30 | 2020-12-30 | high-Cr alloy steel drainage sand and use method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114985718A (en) * | 2022-06-13 | 2022-09-02 | 首钢京唐钢铁联合有限责任公司 | Composite type drainage sand and use method thereof |
| TWI795099B (en) * | 2021-11-26 | 2023-03-01 | 中國鋼鐵股份有限公司 | Double-layer composite filler sand for well block of steel ladle |
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|---|---|---|---|---|
| JPH10128527A (en) * | 1996-10-31 | 1998-05-19 | Sumitomo Metal Ind Ltd | Plugging sand for opening hole at bottom part of molten steel vessel |
| JP2000317625A (en) * | 1999-05-06 | 2000-11-21 | Yamakawa Sangyo Kk | Plugging material for nozzle for steelmaking and production thereof |
| JP2001121256A (en) * | 1999-10-26 | 2001-05-08 | Nippon Thermochemical Kk | Nozzle filling material in slidingly opening/closing device for molten metal holding vessel |
| CN101579733A (en) * | 2009-06-11 | 2009-11-18 | 内蒙古第一机械制造（集团）有限公司 | Nozzle structure at bottom of refining furnace and nozzle filling method |
| CN100581683C (en) * | 2007-12-11 | 2010-01-20 | 河南通宇冶材集团有限公司 | Preparation method of drainage agent for refining in three phases |
| CN110423947A (en) * | 2019-09-02 | 2019-11-08 | 湖南华菱湘潭钢铁有限公司 | A kind of smelting process of the low boron steel of low-sulfur |
| CN111283181A (en) * | 2020-02-27 | 2020-06-16 | 北京首钢股份有限公司 | Filling method of double-layer drainage sand and application thereof |
| CN111545738A (en) * | 2020-05-18 | 2020-08-18 | 西峡龙成冶金材料有限公司 | Drainage sand and preparation method and application thereof |
| CN111906290A (en) * | 2020-07-20 | 2020-11-10 | 东北大学 | Special drainage sand for high-manganese high-aluminum steel and use method |
-
2020
- 2020-12-30 CN CN202011615328.6A patent/CN112743071A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10128527A (en) * | 1996-10-31 | 1998-05-19 | Sumitomo Metal Ind Ltd | Plugging sand for opening hole at bottom part of molten steel vessel |
| JP2000317625A (en) * | 1999-05-06 | 2000-11-21 | Yamakawa Sangyo Kk | Plugging material for nozzle for steelmaking and production thereof |
| JP2001121256A (en) * | 1999-10-26 | 2001-05-08 | Nippon Thermochemical Kk | Nozzle filling material in slidingly opening/closing device for molten metal holding vessel |
| CN100581683C (en) * | 2007-12-11 | 2010-01-20 | 河南通宇冶材集团有限公司 | Preparation method of drainage agent for refining in three phases |
| CN101579733A (en) * | 2009-06-11 | 2009-11-18 | 内蒙古第一机械制造（集团）有限公司 | Nozzle structure at bottom of refining furnace and nozzle filling method |
| CN110423947A (en) * | 2019-09-02 | 2019-11-08 | 湖南华菱湘潭钢铁有限公司 | A kind of smelting process of the low boron steel of low-sulfur |
| CN111283181A (en) * | 2020-02-27 | 2020-06-16 | 北京首钢股份有限公司 | Filling method of double-layer drainage sand and application thereof |
| CN111545738A (en) * | 2020-05-18 | 2020-08-18 | 西峡龙成冶金材料有限公司 | Drainage sand and preparation method and application thereof |
| CN111906290A (en) * | 2020-07-20 | 2020-11-10 | 东北大学 | Special drainage sand for high-manganese high-aluminum steel and use method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI795099B (en) * | 2021-11-26 | 2023-03-01 | 中國鋼鐵股份有限公司 | Double-layer composite filler sand for well block of steel ladle |
| CN114985718A (en) * | 2022-06-13 | 2022-09-02 | 首钢京唐钢铁联合有限责任公司 | Composite type drainage sand and use method thereof |
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