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A Method for Reducing Large Size Calcium Aluminate Inclusions in Steel

A calcium aluminate, large-scale technology, used in casting melt containers, manufacturing tools, casting equipment, etc., can solve the problems of elaboration, difficult to float and remove, and achieve the effect of reducing the number of

Active Publication Date: 2020-10-30
ZENITH STEEL GROUP CORP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In "Influence and Optimization of Ladle Refractories on Inclusions in Steel", the influence of refractory materials on inclusions in steel was studied, but mainly focused on oxygen content, sulfide inclusions, silicate inclusions, and alumina inclusions in steel In the above, there is no elaboration on the large-sized calcium-aluminate inclusions in the molten steel. On the other hand, the large-sized inclusions produced in the refining process will be quickly removed during the smelting process and the subsequent soft blowing process, and will not be removed in the smelting process. This process produces a large number of large-sized inclusions that are left in subsequent products. The large-sized calcium-aluminate inclusions involved in this paper are generated in the nozzle of the tundish, and soon enter the crystallizer and are captured by the solidified shell. It is difficult to remove by floating, so it needs to focus on control

Method used

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  • A Method for Reducing Large Size Calcium Aluminate Inclusions in Steel
  • A Method for Reducing Large Size Calcium Aluminate Inclusions in Steel
  • A Method for Reducing Large Size Calcium Aluminate Inclusions in Steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1

[0030] Choose 8 machines and 8 streams tundish separated on the left and right sides (4 streams on the left and right sides, that is, the left and right tundish have 4 tundish immersion nozzles (Al 2 O 3 -C quality)), under the condition that other process parameters remain unchanged, the left and right tundish immersion nozzles use the same manufacturer (for example, Vesuvius), and the chemical composition of the refractory material is similar to meet the requirements of Al 2 O 3 ≥50%, C≥1% requirements.

Embodiment 1

[0031] Example 1: During the test, the total baking time of the left tundish is required to be 5h, first bake for about 1h, and it is required that the temperature of the immersion nozzle of the tundish be maintained at about 100°C within this 1h; then the temperature is rapidly raised to 700°C, and the temperature is increased. Speed ​​30℃ / min, keep it at 700℃ for 3h; then heat up to 900℃, keep it for about 1h;

Embodiment 2 and comparative example 2

[0037] Use 8 machines and 8-stream tundish separated on the left and right sides (4 streams on the left and right sides, that is, the left and right tundish have 4 tundish immersion nozzles). Under the condition of other process parameters unchanged, the left and right sides are in the middle The package immersion nozzle uses the same manufacturer (for example, Vesuvius), and the chemical composition of the refractory material is similar to meet the requirements of Al 2 O 3 ≥50%, C≥1% requirements.

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Abstract

The invention discloses a method for reducing large-scale calcium-aluminate inclusions in steel. The method is to control Al 2 o 3 ‑Decarburization depth of C-quality submerged nozzle refractory material, to achieve the purpose of reducing large-scale calcium-aluminate inclusions; the continuous casting refractory involved is a tundish submerged nozzle, and the main component of the submerged nozzle refractory material is oxidation Aluminum and carbon; in steelmaking production, by controlling Al 2 o 3 ‑Decarburization depth of C-quality submerged nozzle refractory materials to reduce large-scale calcium-aluminate inclusions. The steel type produced by the method of the invention can greatly reduce the quantity of large-size calcium-aluminate and improve the quality of steel products.

Description

Technical field [0001] The invention relates to a method for reducing large-size calcium aluminate inclusions in steel. Background technique [0002] Large-size calcium aluminate inclusions in steel have an impact on many steel products. Therefore, bearing steel, pipeline steel, etc. have put forward technical requirements for calcium aluminate inclusions in steel. In order to reduce or even eliminate large-size calcium aluminate, many metallurgical workers have carried out related work. [0003] After searching, domestic and foreign patents on reducing large-size calcium aluminate inclusions in steel mainly focus on the method of controlling the deoxidation of molten steel, such as "a control method for deoxidation of bearing steel without Ds inclusions", "a Bearing steel smelting process that is beneficial to control inclusions "Selected to change the conventional aluminum deoxidation process to silicon deoxidation process to reduce the size and number of calcium aluminate inclu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/54C21C7/00
CPCB22D41/54C21C7/00
Inventor 屈志东孟晓玲谢有王昆鹏屠兴圹徐建飞许加陆林俊沈艳
Owner ZENITH STEEL GROUP CORP CO LTD
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