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Method for improving castability of ultra-low carbon steel

A technology of ultra-low carbon steel and castability, which is applied in the field of molten steel refining, can solve problems such as difficulty in improving the castability of molten steel, and achieve the effects of effective treatment, promotion of collision growth, and improvement of castability

Pending Publication Date: 2022-07-22
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides a method for improving the castability of ultra-low carbon steel, in order to solve the technical problem that the castability of molten steel in the prior art is difficult to improve

Method used

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  • Method for improving castability of ultra-low carbon steel
  • Method for improving castability of ultra-low carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] like figure 1 and figure 2 As shown, a method for improving the castability of ultra-low carbon steel is provided, the method comprising:

[0067] S11. Obtain the incoming molten steel from RH refining to the station;

[0068] S12. Perform the second oxygen determination and temperature determination on the incoming molten steel to obtain the second oxygen content and temperature of the incoming molten steel;

[0069] S13. Obtain the target value of carbon content according to the second oxygen content and the temperature of the incoming molten steel;

[0070] S14. Carry out cyclic decarburization according to the target value of carbon content to obtain decarburized molten steel after RH refining cyclic decarburization;

[0071] S2. The first oxygen determination is performed on the decarburized molten steel to obtain the first oxygen content;

[0072] S3. according to the first oxygen content, obtain the required addition of aluminum-containing deoxidizer for deo...

Embodiment 2

[0086] Comparing Example 2 with Example 1, the difference between Example 2 and Example 1 is:

[0087] The first oxygen content was 350 ppm.

[0088] The conversion rate was taken as 94%.

[0089] In terms of mass fraction, the chemical composition of the high calcium aluminum slag ball includes: Ca: 25%, Al: 48%, and the rest are inevitable impurities.

[0090] The added amount of high calcium aluminum slag ball is 150kg.

[0091] The flow rate of bottom blowing is 40L / min, and the time of bottom blowing is 10min.

[0092] The second oxygen content was 550 ppm.

[0093] The temperature of the incoming molten steel was 1620°C.

Embodiment 3

[0095] Comparing Example 3 with Example 1, the difference between Example 3 and Example 1 is:

[0096] The first oxygen content was 450 ppm.

[0097] The conversion rate was taken as 92%.

[0098] In terms of mass fraction, the chemical composition of the high calcium aluminum slag ball includes: Ca: 25%, Al: 48%, and the rest are inevitable impurities.

[0099] The added amount of high calcium aluminum slag ball is 200kg.

[0100] The flow rate of bottom blowing is 100L / min, and the time of bottom blowing is 15min.

[0101] The second oxygen content was 750 ppm.

[0102] The temperature of the incoming molten steel was 1630°C.

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Abstract

The invention relates to the technical field of molten steel refining, in particular to a method for improving the castability of ultra-low carbon steel, and the method comprises the following steps: obtaining decarburized molten steel after RH refining cycle decarburization; carrying out first oxygen determination on the decarburized molten steel to obtain a first oxygen content; according to the first oxygen content, the adding amount of an aluminum-containing deoxidizing agent needed by deoxidization is obtained; according to the adding amount of the aluminum-containing deoxidizer, the decarbonized molten steel is added with the aluminum-containing deoxidizer for deoxidation, and deoxidized molten steel containing Al2O3 cluster-shaped inclusions is obtained; alloying the deoxidized molten steel, then finishing RH refining, and carrying out bottom blowing and impurity removal to obtain impurity-removed clean molten steel; the oxygen content of the decarburized molten steel is controlled, an aluminum-containing deoxidizing agent is added for deoxidization, and bottom blowing is performed after RH refining is finished, so that the inclusion is further promoted to collide and grow up, the Al2O3 inclusion can conveniently float upwards and be removed, the clean molten steel is obtained, and the castability of the ultra-low carbon steel is improved.

Description

technical field [0001] The present application relates to the technical field of molten steel refining, and in particular, to a method for improving the castability of ultra-low carbon steel. Background technique [0002] In production, the pourability of molten steel is often used to characterize the influence of molten steel cleanliness on pouring, and molten steel cleanliness has a great influence on whether continuous casting is forward or not. Especially in the constant pulling speed stage, the opening of the stopper during continuous casting can be To a certain extent, it reflects the pourability of molten steel, especially when there are inclusion deposits in the bowl of the upper nozzle, the greater the change in opening degree, the worse the pourability of molten steel. In addition, in the process of producing ultra-low carbon steel, the Al contained in molten steel 2 O 3 Inclusions are easy to form nodules at the submerged nozzle, and the formed nodules change th...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/06C21C7/068
CPCC21C7/10C21C7/06C21C7/068Y02P10/20
Inventor 罗衍昭季晨曦陈斌王少军温瀚何文远关顺宽董文亮贾刘兵张聪聪肖华生刘金刚徐海卫赵长亮
Owner SHOUGANG CORPORATION
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