Submerged nozzle for continuous casting, manufacturing method thereof, and continuous casting method using the submerged nozzle for continuous casting
A manufacturing method, nozzle technology, applied in the direction of manufacturing tools, casting equipment, casting melt containers, etc.
Active Publication Date: 2016-07-06
JFE STEEL CORP
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- Abstract
- Description
- Claims
- Application Information
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Embodiment 1～3、 comparative example 1～5
[0086] Among the various materials described in Table 1 above, the materials shown in Table 2 below were used to produce submerged nozzles of the sizes shown below. In addition, the part (region A) other than the region B formed of the material B is formed of the material A.
[0087] ·Wall thickness of submerged nozzle: 20mm
[0088] ·The length of the cylindrical flow path of the submerged nozzle: 600mm
[0089] ·The thickness of material A (area A): 5mm
[0090] ·The thickness of material B (area B): 20mm
[0091] ·The arrangement length of material A (area A) in the height direction (mm): Refer to the parentheses in the material column in Table 2 below
[0092] ·The arrangement length of material B (area B) in the height direction (mm): Refer to the parentheses in the material column in Table 2 below
[0093]
[0094] For each submerged nozzle manufactured, the average value of the thermal expansion coefficient of the inner wall surface of the submerged nozzle in the height direction ...
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Abstract
An object of the present invention is to provide a continuous casting submerged nozzle excellent in both spalling resistance and alumina low-adhesion property, and a continuous casting method using the continuous casting submerged nozzle. The submerged nozzle for continuous casting according to the present invention is a submerged nozzle for continuous casting provided with a pair of discharge holes symmetrical to the left and right with respect to the axis on the side surface near the bottom of the inner wall surface constituting the cylindrical flow path of molten metal, wherein the submerged The nozzle is continuously composed of material B over the entire length in the height direction, and the above-mentioned inner wall surface is composed of a region B formed of the above-mentioned material B and a region A formed of a material different from the above-mentioned material B, and the material constituting the above-mentioned region A is 1500 The linear expansion coefficient of ℃ is larger than the linear expansion coefficient of the above-mentioned material B at 1500 ℃, the average value of the linear expansion coefficient of the above-mentioned inner wall surface at 1500 ℃ in the height direction and the average value of the linear expansion coefficient of the above-mentioned inner wall surface at 900 ℃ in the height direction The difference in value is 0.40% to 0.60%.
Description
Technical field [0001] The present invention relates to a submerged nozzle for continuous casting and a continuous casting method using the submerged nozzle for continuous casting. Background technique [0002] In continuous casting, when injecting molten metal from a ladle into a tundish, and when injecting molten metal from a tundish into a mold, nozzles made of refractory materials such as long nozzles, submerged nozzles, and sliding nozzles are used. [0003] These nozzles are used to prevent the molten metal from being oxidized by the air and to ensure stable injection into the mold. In order to make the molten metal excellent in dissolution resistance, abrasion resistance, and spalling resistance, they are mostly made of alumina-carbon 的Refractory composition. [0004] However, since alumina-carbonaceous refractories are easy to adhere to the alumina in the molten metal, when a nozzle composed of alumina-carbonaceous refractories is used, there are the following situations: alu...
Claims
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IPC IPC(8): B22D11/10B22D41/50
CPCB22D41/505
Inventor 淡路谷浩久保田淳
Owner JFE STEEL CORP