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Steel slag modification method and device of ultra-low carbon steel

A technology of ultra-low carbon steel and steel slag, which is applied in the field of refining and can solve the problems of low efficiency of steel slag modification and affecting the quality of steel plates, etc.

Active Publication Date: 2021-04-13
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the embodiment of the present invention provides a method and device for upgrading ultra-low carbon steel with steel slag, which is used to solve the problems in the prior art When smelting ultra-low carbon steel, the efficiency of steel slag modification is low, which affects the technical problem of steel plate quality

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  • Steel slag modification method and device of ultra-low carbon steel
  • Steel slag modification method and device of ultra-low carbon steel

Examples

Experimental program
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Embodiment 1

[0042] This embodiment provides a steel slag modification method for ultra-low carbon steel, such as figure 1 As shown, the methods include:

[0043] S110, at the end of the converter steelmaking tapping, obtain the first added weight of the modifier, and add the modifier of the first added weight to the slag surface; the modifier includes: aluminum, lime particles and impurities , the mass fraction of the aluminum is 50-70%, the mass fraction of the lime particles is 20-30%, and the particle diameter of the lime particles is 5-20mm;

[0044]At the end of converter steelmaking and tapping, the steel slag on the molten steel surface needs to be modified to reduce FeO and MnO in the steel slag to ensure the cleanliness of the molten steel. Then it is necessary to obtain the first added weight of the modifier. The modifier includes: aluminum, lime grains and impurities, the mass fraction of aluminum is 50-70%, the mass fraction of lime grains is 20-30%, and the particle size of ...

Embodiment 2

[0069] This embodiment provides a steel slag reforming device for ultra-low carbon steel, such as figure 2 As shown, the device includes: a first determining unit 21, a second determining unit 22, and a third determining unit 23; wherein,

[0070] The first determination unit 21 is used to obtain the first added weight of the modifier at the end of converter steelmaking and tapping, and add the modifier of the first added weight to the slag surface; the modifier includes : aluminum, lime grains and impurities, the mass fraction of the aluminum is 50-70%, the mass fraction of the lime grains is 20-30%, and the particle diameter of the lime grains is 5-20mm;

[0071] The second determining unit 22 is used to obtain a flow rate of argon bottom blowing before the RH vacuum treatment, blow the primary argon gas into the ladle through the bottom blow hole of the ladle, and maintain the first preset time;

[0072] The third determining unit 23 is used to obtain the second addition ...

Embodiment 3

[0096] In practical application, when using the upgrading method provided in Example 1 and the upgrading device provided in Example 2 to upgrade steel slag in a certain refining process, the specific implementation is as follows:

[0097] Combined blowing converter-RH-continuous casting is used to smelt ultra-low carbon steel, and the ladle capacity is 300t.

[0098] At the end of converter tapping and blowing, the oxygen activity was determined to be 550ppm. At the end of tapping, an aluminum-containing modifier was added to the slag surface. The mass fraction of aluminum in the modifier was 55%, and the average particle size of lime was 15mm. The amount of modifier added The slag layer thickness of steel slag top slag was determined to be 110mm.

[0099] When the RH enters the station to place the ladle, the argon bottom blowing is turned on for the first time, and the flow rate of the argon bottom blowing is set to 890L / min; the bottom blowing is turned off after maintainin...

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Abstract

The invention provides a steel slag modification method and device of ultra-low carbon steel. The steel slag modification method of the ultra-low carbon steel comprises the following steps: determining a first adding weight of a modifier before RH vacuum treatment; blowing primary argon into the steel ladle, and maintaining for a first preset time; and determining a second adding weight of the modifier when RH refining is finished, determining a secondary argon bottom blowing flow, blowing secondary argon is into the steel ladle, and maintaining for a second preset time. Thus, argon is blown into the steel ladle before the RH vacuum treatment, so that the oxygen content in the molten steel can be reduced, and the steel slag is prevented from being further oxidized; argon is blown from the bottom of the steel ladle after RH vacuum breaking, so that the activity of a steel slag interface is ensured, the utilization efficiency of the modifier is improved, and steel slag crusting is prevented; in addition, due to the fact that the mass fraction of aluminum in the modifier is high, FeO and MnO in the steel slag can be fully reduced, and therefore, the oxidability of the top of the steel slag is reduced, the modification effect of the steel slag is ensured, molten steel is prevented from being secondarily oxidized by the steel slag, and the surface quality of a steel plate is ensured.

Description

technical field [0001] The invention belongs to the technical field of refining, and in particular relates to a steel slag modification method and device for ultra-low carbon steel. Background technique [0002] Ultra-low carbon steel is widely used in industries such as automobiles and home appliances, and has extremely strict requirements on surface quality. Since this steel type needs to be deeply decarburized in RH refining, non-killed tapping is generally used, and it is very difficult to control the oxidation of steel slag. It is generally believed that the oxidation of steel slag (evaluated by the content of FeO+MnO) has a great influence on the cleanliness of molten steel. Therefore, in the production of ultra-low carbon steel, how to reduce the oxidation of top slag efficiently and at low cost is a problem for steelmakers. A big problem. [0003] In the prior art, when smelting ultra-low carbon steel, the general process adopted is combined blowing converter-RH re...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/00C21C7/072C21C5/36C21C5/46
CPCC21C7/10C21C7/0087C21C7/0006C21C7/0037C21C7/072C21C5/36C21C5/4673C21C2007/0093Y02P10/20
Inventor 邓小旋李海波朱国森马文俊初仁生季晨曦刘柏松潘宏伟邵肖静刘国梁吕迺冰
Owner SHOUGANG CORPORATION
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