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A kind of modification method of cold-rolled sheet steel slag

A cold-rolled thin plate and steel slag technology, which is applied in the manufacture of converters, etc., can solve the problems of unstable oxidation control of steel slag, and achieve the effects of solving unstable steel slag modification, reducing the degree of oxygen transfer, and reducing the number of non-metallic inclusions

Active Publication Date: 2017-12-22
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for upgrading cold-rolled steel slag, which solves the problem in the prior art that the oxidation control of steel slag is not stable after being modified with a modifier

Method used

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  • A kind of modification method of cold-rolled sheet steel slag

Examples

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Effect test

example 1

[0040] Applied to 300t ladle smelting steel type DC04, at the end of converter tapping: the oxygen content at the end of the converter is 780ppm, and the tapping temperature is 1685°C. Immediately add 355 kg of Al-based modifier at the end of converter tapping, and control the continuous swing of the feeding arm to even out the Al-based modifier. When the RH refining enters the station, it is found from the test: "Fe in the steel slag tThe O+MnO" content is 8.3%, the incoming oxygen content is 507ppm, the incoming temperature is 1620°C, and there is no temperature rise and blowing oxygen. After the RH refining is completed, 90kg of Al-based modifier is added to the slag hole after the RH dipping tube is lifted. The heat of molten steel melts the Al-based modifier and floats into the slag to deoxidize the steel slag. The "Fe t The content of O+MnO” was 4.5%. Following the subsequent continuous casting process, the rod position of the 6th continuous casting furnace was stable. ...

example 2

[0042] Applied to 300t ladle smelting steel type SPHC. At the end of the converter tapping: the oxygen content at the end of the converter is 897ppm, and the tapping temperature is 1713°C. Immediately add 425kg of Al-based modifier at the end of the converter tapping, and control the continuous swing of the feeding arm. Use a uniform Al-based modifier. When the RH refining enters the station, it is found from the test: "Fe in the steel slag t The content of O+MnO” is 7.3%, the incoming oxygen content is 475ppm, the incoming temperature is 1637°C, and there is no temperature rise and oxygen blowing. After the RH refining is completed, 90kg of Al-based modifier is added to the slag hole after the RH dipping tube is lifted. The heat of molten steel melts the Al-based modifier and floats into the slag to deoxidize the steel slag. The "Fe t The content of O+MnO” is 6.0%. Following the follow-up continuous casting process, 10 furnaces were continuously cast in this pouring time, an...

example 3

[0044] Applied to 300t ladle smelting steel DX54D. At the end of the converter tapping: the oxygen content at the end of the converter is 641ppm, and the tapping temperature is 1692°C. Immediately add 362kg of Al-based modifier at the end of the converter tapping, and control the continuous swing of the feeding arm to Uniform Al-based modifier. When RH refining enters the station: "Fe in steel slag t The content of O+MnO” is 5.2%, the incoming oxygen content is 477ppm, the incoming temperature is 1610°C, and the temperature rises and blows oxygen at 152m 3 , after RH refining, add 140kg of Al-based modifier to the slag hole after the RH dipping tube is lifted, use the heat of molten steel to melt the Al-based modifier, and then float up into the slag to deoxidize the steel slag. In the composition of steel slag, "Fe t The content of O+MnO” was 4.0%. Following the follow-up continuous casting process, no nozzles were replaced in the 7 furnaces of this pouring time. Further tr...

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Abstract

The invention discloses a modification method for cold-rolled sheet steel slag. The modification method comprises the following steps: when converter tapping is over, adding an Al-based modifier into a ladle to deoxidize the steel slag; and after RH refining is over, adding the Al-based modifier again to deoxidize the steel slag. In the step of adding the Al-based modifier again to deoxidize the steel slag after RH refining is over, the corresponding relationship between the adding amount of the Al-based modifier and a heating oxygen blowing amount is as follows: when the heating oxygen blowing amount is less than 0.3 m<3> / t, the adding amount of the Al-based modifier is 0.3 kg / t; when the heating oxygen blowing amount is 0.3-0.8 m<3> / t, the adding amount of the Al-based modifier is 0.3-0.8 kg / t; and when the heating oxygen blowing amount is greater than 0.8 m<3> / t, the adding amount of the Al-based modifier is 0.8-1.0 kg / t. According to the modification method,the problem of unstable deoxidation modification of steel slag in the prior artissolved, the quantity of non-metallic inclusions in steel is reduced, and the purity of molten steel and the surface quality of a cold-rolled sheet are improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for modifying steel slag from cold-rolled sheets. Background technique [0002] Cold-rolled sheet steel is widely used in fields such as automobiles and home appliances. Cold-rolled thin-plate steel grades are generally thinner (<2mm) due to the cold-rolling process. In addition to requiring good mechanical properties, the steel plate is also required to have excellent surface quality. In recent years, downstream customers have almost strict requirements on the surface quality of cold-rolled sheets, especially automotive outer sheets, and even require "zero defects". The large-size non-metallic inclusions in the steel plate, such as clustered alumina, are the main cause of these surface defects. Therefore, controlling the cleanliness of molten steel to reduce large-size inclusions in steel has always been the relentless pursuit of metallurgists. [0003] Studie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21C7/06
CPCC21C5/36C21C7/0006C21C7/06
Inventor 邓小旋季晨曦崔阳田志红邵肖静潘宏伟赵长亮董文亮关顺宽李一丁唐德池曾智张宏艳
Owner SHOUGANG CORPORATION