Inclusion control method for ultrapure austenitic stainless steel for cold-rolled sheets

A technology of ultra-pure austenite and cold-rolled thin plate, which is applied in the field of stainless steel refining, can solve the problems of inclusion control process that the effect of inclusion control is not detailed, and achieve the effect of strong salt spray corrosion resistance

Inactive Publication Date: 2018-09-21
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese Patent Application No. 201110342002.5 discloses a method for manufacturing stainless steel thin strips for electronic product casings, emphasizing the control of aluminum content to reduce inclusions, but the specific inclusion control process and inclusion control effect are not described in detail

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Steel SUS304

[0022] In the AOD furnace, the stainless steel mother liquor is decarburized, blown and reduced, and then the slag alkalinity is adjusted to 2.0; the amount of molten steel for AOD tapping is 179t, and then the ladle slag is slag-slipped to 100mm;

[0023] LF enters the station and adds 200kg of Al pellets, 150kg of Al powder, 700kg of lime, and 200kg of fluorite for deep deoxidation and slag adjustment, and then heats up and stirs to make the composition of the slag uniform and the temperature of the molten steel suitable; feed pure Ca wire 1m / t of steel; 160L / min ladle bottom blowing argon gas flow and stirring for 20min; after calming down for 30min, the ladle was sent to the continuous casting platform to be cast into continuous casting slabs.

[0024] In this embodiment, the total oxygen content of the slab was sampled and analyzed to be 10ppm, and the metallographic analysis of the slab showed that the maximum size of inclusions was 12 μm;

[0025]...

Embodiment 2

[0027] Steel SUS304

[0028] In the AOD furnace, the stainless steel mother liquor is decarburized, blown and reduced, and then the slag alkalinity is adjusted to 2.2; the amount of molten steel for AOD tapping is 181t, and then the ladle slag is slag-slipped to 120mm;

[0029] LF enters the station and adds 260kg of Al pellets, 100kg of Al powder, 500kg of lime, and 200kg of fluorite for deep deoxidation and slag adjustment, and then heats up and stirs to make the slag composition uniform and the molten steel temperature suitable; feed pure Ca wire 2m / t steel; 160L / min ladle bottom blowing argon gas flow and stirring for 25min; after calming for 30min, the ladle is sent to the continuous casting platform to be cast into continuous casting slabs.

[0030] In this example, the total oxygen content of the slab was sampled and analyzed to be 8ppm, and the metallographic analysis of the slab showed that the maximum size of inclusions was 10 μm;

[0031] According to the GBT 10561...

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Abstract

The invention discloses an inclusion control method for ultrapure austenitic stainless steel for cold-rolled sheets. The preparation method comprises the following steps: I, performing decarburizationblowing, silicon iron reduction and preliminary dexidation on stainless steel mother liquid in an AOD furnace, and adjusting basicity of slag to 1.8 or higher; II, performing slagging-off treatment on ladle slag after tapping; III, performing refining treatment on an LF furnace; IV, performing continuous casting to obtain a continuous casting billet; V, performing hot rolling and cold rolling onthe continuous casting billet, thereby obtaining the stainless steel plate. According to the control method disclosed by the invention, deep deoxidization of aluminum is adopted, and the total oxygencontent is lower than 20 ppm; due to a small amount of inclusion, the prepared stainless steel is high in salt spray resistance and corrosion resistance; the inclusion type in the stainless steel prepared in the invention is mainly fine magnesium aluminate spinel, and the stainless steel does not extend in a rolling process and does not form defects on the cold drawing surface.

Description

technical field [0001] The invention relates to a deoxidation and inclusion control process for ultra-pure stainless steel, in particular to a method for controlling inclusions of ultra-pure austenitic stainless steel for cold-rolled sheets, and belongs to the technical field of stainless steel refining. Background technique [0002] Because stainless steel has the characteristics of corrosion resistance, beautiful appearance, and easy processing, it is currently being widely used in manufacturing fields such as decorative materials, brand logos, and electronic product casings. With the development of the times, the demand for stainless steel cold-rolled sheets in these fields is increasing, and the requirements are becoming more and more stringent. For example, some special industries require stainless steel to be rolled into a cold sheet of less than 0.5mm not only without defects, but also to maintain good corrosion resistance; in addition, some industries require stainle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 李建民郎炜昀翟俊
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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