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Production method for IF steel for outer plates without inclusion defects, of automobiles

A production method and automobile technology, applied in the manufacture of converters, etc., can solve problems such as roll marks, scratches, thin specifications, etc., and achieve the effect of reducing inclusion defects and high yield

Inactive Publication Date: 2020-07-03
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As the most basic condition of cold-rolled automobile sheet, the steel quality is required to be pure. However, due to the long production process and thin specifications of the automobile outer sheet, various surface defects are prone to appear on the surface of the strip during the production process, such as roll marks, Scratches, inclusions and oxide scales, etc.
In particular, some inclusions will inevitably be brought during the smelting and casting process of steel grades. These inclusions mainly exist in the form of non-metallic compounds, and may aggregate into clusters or macroscopic inclusion defects, resulting in surface inclusion defects, and these defects Significantly affects the surface appearance and paintability of automotive panels

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A production method of IF steel for automobile outer panels without inclusion defects, which is produced by a double-blowing converter, specifically: converter blowing-RH refining-casting-continuous casting;

[0047] Wherein, the concrete process parameter control of each step is as follows:

[0048] 1) The amount of slag entering the molten iron in the converter is ≤20mm. To ensure the smooth progress of converter slagging is beneficial to control the end point (alkalinity, oxidation) of slag.

[0049] 2) Use slag reforming materials (deoxidation) to modify the top slag after tapping the converter to reduce the oxidizability of the slag to ΣFe≤7%.

[0050] 3) Control the oxygen content at the end of converter blowing to 400-600ppm.

[0051] 4) Control the slag amount of the converter to ensure that the slag before refining RH is not greater than 70mm.

[0052] 5) F·O before refining RH, 250ppm~600ppm.

[0053] 6) Oxygen supply during RH process≤30m 3 .

[0054] 7...

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Abstract

The invention discloses a production method for IF steel for outer plates without inclusion defects, of automobiles. According to the production method, key index control is carried out on a smeltingprocess for the outer plates of the automobiles, and the inclusion defects of the plates are greatly reduced through the implementation of the key index control, so that the advantages of high yield and the like are achieved.

Description

technical field [0001] The disclosure of the invention relates to the technical field of steelmaking, in particular to a production method of IF steel for automobile outer plates without inclusion defects. Background technique [0002] The panel materials for automobiles are mainly ultra-low carbon deep drawing steel represented by IF steel, which is the third-generation stamping steel with excellent deep drawing performance after boiling steel and aluminum killed steel, especially suitable for complex shapes and surface quality requirements Especially strict stamping parts, that is, the main requirements for the plate to have good formability, strength, elongation, dent resistance and corrosion resistance. [0003] As the most basic condition of cold-rolled automobile sheet, the steel quality is required to be pure. However, due to the long production process and thin specifications of the automobile outer sheet, various surface defects are prone to appear on the surface of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35C21C5/36C21C7/10B22D11/18
CPCB22D11/181C21C5/35C21C5/36C21C7/10
Inventor 于华财曹志众李明光黄健刘军周宏伟张兴国卢秉仲张霞
Owner BENGANG STEEL PLATES
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