CN217798934U - Continuous casting immersion type water gap for steelmaking - Google Patents
Continuous casting immersion type water gap for steelmaking Download PDFInfo
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- CN217798934U CN217798934U CN202221748083.9U CN202221748083U CN217798934U CN 217798934 U CN217798934 U CN 217798934U CN 202221748083 U CN202221748083 U CN 202221748083U CN 217798934 U CN217798934 U CN 217798934U
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Abstract
The utility model discloses a continuous casting submerged nozzle for steelmaking, which has a hollow structure and comprises a horn-shaped inlet section and a cylindrical outlet section which are integrally connected; the outlet section is of a double-layer structure and comprises an inner-layer rare earth aluminate carbon layer, an outer-layer integrally-connected body aluminum carbon layer and a slag line zirconium carbon layer. The utility model provides a mouth of a river of steel-making in-process can be avoided to continuous casting immersion nozzle for steelmaking and block up.
Description
Technical Field
The utility model belongs to the technical field of metallurgical refractory material, concretely relates to immersion nozzle for steelmaking.
Background
The smelting of the rare earth steel is beneficial to improving the quality level of steel materials, and reaches or exceeds the product quality level of foreign advanced enterprises. With the continuous and intensive research, researchers find that the addition of rare earth into steel has various beneficial effects, including purification, modification, microalloying, hydrogen capture and the like, and the rare earth can improve the structure, and improve the tensile strength, wear resistance, drawing property and fatigue resistance of steel. However, the production of rare earth has a plurality of bottleneck problems, and under the high-temperature state of continuous casting, the Rare Earth (RE) in the molten steel is very active and can react with magnesium, high-alumina and silicate refractory materials as follows:
4RE+3SiO 2 ＝2RE 2 O 3 +3Si
2RE+Al 2 O 3 ＝RE 2 O 3 +2Al
2RE+3MgO＝RE 2 O 3 +3Mg
further leading to the plug rod out of control, the nozzle blockage and in severe cases to the pouring interruption or production accident. The above reactions occur in the covering agent, dry material, crystallizer casting powder and the like in the tundish, and the quality of the inner part and the outer part of the casting blank is widely influenced.
The technology of applying rare earth oxide to improve refractory materials in the field of refractory materials is still in the exploration stage, at present, rare earth oxide is usually added into basic refractory materials such as magnesium refractory materials, magnesium spinel refractory materials and the like to reduce the apparent porosity of the refractory materials, improve the compactness, high-temperature breaking strength, thermal shock resistance and the like of the refractory materials, but the refractory materials still have the phenomena of water gap blockage and plug rod runaway.
SUMMERY OF THE UTILITY MODEL
Aiming at one or more problems in the prior art, the utility model provides a continuous casting immersion nozzle for steelmaking, which is of a hollow structure and comprises a horn-shaped inlet section and a cylindrical outlet section which are connected integrally; wherein:
the external diameter of the bell mouth of the inlet section is 115-130mm, and the internal diameter is 80-90mm;
the export section is bilayer structure, including inlayer and skin, wherein the inlayer is the aluminate rare earth carbon-layer, outer body aluminium carbon-layer and the slag line zirconium carbon-layer as an organic whole connection, slag line zirconium carbon-layer is located and is close to the one end in the exit of export section, body aluminium carbon-layer is located and is close to the one end of import section.
In some embodiments, the bulk aluminum carbon layer and slag line zirconium carbon layer are joined at a location 120mm from the outlet of the outlet section.
In some embodiments, the hollow structure of the outlet section has a diameter of 30-50mm.
In some embodiments, the rare earth aluminate carbon layer has a thickness of 4 to 6mm.
In some embodiments, the bulk aluminum carbon layer and the slag line zirconium carbon layer each have a thickness of 20 to 25mm.
In some embodiments, the bulk aluminum carbon layer and the slag line zirconium carbon layer are the same thickness.
The submerged nozzle for steelmaking provided by the utility model comprises a horn-shaped inlet section and a cylindrical outlet section which are integrally connected; wherein the outlet section is bilayer structure, including the aluminic acid tombarthite carbon-coated and outer body aluminum carbon-coated and slag line zirconium carbon-coated of body coupling of inlayer, wherein when using this continuous casting immersion nozzle, the reaction of tombarthite carbon-coated and molten steel direct contact of the aluminic acid tombarthite carbon-coated and the molten steel in can effectively avoiding the molten steel and magnesium matter, high alumina matter, silicate refractory material etc. and then can effectively avoid the mouth of a river blocking phenomenon in the tombarthite steel production process.
Drawings
Fig. 1 is a schematic structural view of a continuous casting submerged nozzle for steelmaking according to the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples, which are provided to facilitate understanding of the present invention and are not intended to limit the present invention.
Example 1: continuous casting immersion type water gap for steel making
As shown in fig. 1, there is shown a schematic structural view of a continuous casting submerged entry nozzle for steel making according to this embodiment, which has a hollow structure, an inlet section 10 having a bell shape at one end and an outlet section 11 having a cylindrical shape at the other end, wherein the bell mouth of the inlet section 10 has an outer diameter of 115-130mm and an inner diameter of 80-90mm, and the hollow diameter of the outlet section 11 is 30-50mm; in the cylindrical outlet section 11, the inner layer (i.e., the layer in direct contact with the hollow) is a rare earth aluminate carbon layer 12 having a thickness in the range of 4-6mm, and the outer side of the rare earth aluminate carbon layer 12 is a bulk aluminum carbon layer 13 (having a thickness in the range of 20-25 mm), or a slag line zirconium carbon layer 14 (having a thickness in the range of 20-25mm, preferably the same as the thickness of the bulk aluminum carbon layer 13 of the outlet section 11), wherein the bulk aluminum carbon layer 13 is integrally connected with the slag line zirconium carbon layer 14, preferably both are connected at a position 120mm from the outlet of the outlet section 11.
Example 2: preparation of continuous casting submerged nozzle for steelmaking
(1) Preparation of rare earth raw material for producing continuous casting submerged nozzle for steelmaking
1.1 Uniformly mixing rare earth powder (which can be rare earth cerium powder, rare earth lanthanum powder, rare earth neodymium powder, rare earth yttrium powder or a mixture thereof) with the purity of more than or equal to 99.0 percent (the granularity is less than 325 meshes) and aluminum powder with the purity of more than or equal to 99.0 percent (the granularity is less than 325 meshes) according to the molar ratio of the rare earth to the Al (0.5-3) to 1 to obtain an intermediate;
1.2 Loading the intermediate obtained in the step 1) into a shuttle kiln, heating to 1500-1700 ℃, keeping for 3.5-4.5 hours, firing to obtain a rare earth and aluminum composite oxide, cooling along with the kiln, crushing, screening and grinding, and selecting composite oxide powder with the granularity of less than 0.5mm as a rare earth raw material for producing a continuous casting submerged nozzle for steelmaking.
(2) Preparation of continuous casting submerged nozzle composite pug for steelmaking
The method for producing the continuous casting submerged nozzle composite mud material for steelmaking by using the rare earth raw material prepared in the step (1) comprises the following steps of material preparation and granulation:
2.1 Putting the rare earth raw material (the addition amount is 90 percent of the total weight of the refractory pug) prepared in the step (1) into a granulator, adding crystalline flake graphite (purchased from Qingdao Mingsheng, the addition amount is 4 percent of the total weight of the refractory pug), boron carbide (purchased from peony Jiang boron carbide Co., ltd, the addition amount is 1 percent of the total weight of the refractory pug) and phenolic resin (the addition amount is 5 percent of the total weight of the refractory pug) as a bonding agent, and mixing for 15-30 minutes to prepare the composite pug.
(3) Preparation of continuous casting submerged nozzle for steelmaking
The method for preparing the continuous casting submerged nozzle by using the composite pug obtained in the step (2) comprises the following steps of: filling a mold → isostatic pressing → curing → sintering → processing → glazing → flaw detection → packaging, which specifically comprises the following operations:
3.1 According to the schematic structural diagram of the continuous casting submerged nozzle shown in fig. 1, the composite pug obtained in step (2), the bulk aluminum carbon layer pug (pug made of brown fused alumina and flake graphite), and the slag line zirconium carbon layer pug (pug made of zirconia and flake graphite) are filled into a mold, and then the qualified continuous casting submerged nozzle is finally obtained through the procedures of molding, curing (drying the pug at 100-120 ℃ for 5-7 hours), firing (keeping the temperature of the cured pug at 1500-1700 ℃ for 2-4 hours), processing, glazing, X-ray flaw detection and the like.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The continuous casting submerged nozzle for steelmaking is characterized by being of a hollow structure and comprising a horn-shaped inlet section 10 and a cylindrical outlet section 11 which are integrally connected; wherein:
the external diameter of the bell mouth of the inlet section 10 is 115-130mm, and the internal diameter is 80-90mm;
the outlet section 11 is of a double-layer structure and comprises an inner layer and an outer layer, wherein the inner layer is a rare earth aluminate carbon layer 12, the outer layer is a body aluminum carbon layer 13 and a slag line zirconium carbon layer 14 which are integrally connected, the slag line zirconium carbon layer 14 is positioned at one end close to the outlet of the outlet section 11, and the body aluminum carbon layer 13 is positioned at one end close to the inlet section 10.
2. The continuous casting submerged nozzle for steelmaking as set forth in claim 1, wherein the body aluminum carbon layer 13 and the slag line zirconium carbon layer 14 are connected at a position 120mm from the outlet of the outlet block 11.
3. The continuous casting submerged nozzle for steelmaking according to claim 1, wherein the hollow structure of the outlet section 11 has a diameter of 30-50mm.
4. The continuous casting submerged nozzle for steelmaking as claimed in claim 1, wherein the rare earth carbon aluminate layer 12 has a thickness of 4-6mm.
5. The continuous casting submerged nozzle for steelmaking as set forth in claim 1, wherein the bulk aluminum carbon layer 13 and the slag line zirconium carbon layer 14 each have a thickness of 20-25mm.
6. The continuous casting submerged nozzle for steelmaking as set forth in claim 5, wherein said bulk aluminum carbon layer 13 and said slag line zirconium carbon layer 14 have the same thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221748083.9U CN217798934U (en) | 2022-07-06 | 2022-07-06 | Continuous casting immersion type water gap for steelmaking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221748083.9U CN217798934U (en) | 2022-07-06 | 2022-07-06 | Continuous casting immersion type water gap for steelmaking |
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| Publication Number | Publication Date |
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| CN217798934U true CN217798934U (en) | 2022-11-15 |
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| CN202221748083.9U Active CN217798934U (en) | 2022-07-06 | 2022-07-06 | Continuous casting immersion type water gap for steelmaking |
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2022
- 2022-07-06 CN CN202221748083.9U patent/CN217798934U/en active Active
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