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Method for controlling occurrence rate of strip-shaped chromatic aberration on surface of pickled low-carbon aluminum killed steel

An aluminum-killed steel acid and rear surface technology, applied in metal rolling and other directions, can solve problems such as strip-shaped chromatic aberration, and achieve the effects of controlling grain coarsening, reducing the generation of mixed grain structure, and increasing the melting range.

Active Publication Date: 2021-08-17
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem of striped color difference on the surface of low-carbon aluminum-killed steel after hot rolling and pickling, the present invention provides a method to control the low-carbon aluminum-killed steel A method for the occurrence rate of banded color difference on the surface after pickling, which can effectively reduce the incidence rate of banded color difference on the surface of hot-rolled pickled low-carbon aluminum-killed steel, and improve the surface quality of hot-rolled pickled low-carbon aluminum-killed steel

Method used

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  • Method for controlling occurrence rate of strip-shaped chromatic aberration on surface of pickled low-carbon aluminum killed steel
  • Method for controlling occurrence rate of strip-shaped chromatic aberration on surface of pickled low-carbon aluminum killed steel
  • Method for controlling occurrence rate of strip-shaped chromatic aberration on surface of pickled low-carbon aluminum killed steel

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Embodiment

[0081] This embodiment is a method for controlling the occurrence rate of banded color difference on the surface of low-carbon aluminum-killed steel after pickling, which specifically includes:

[0082] (1) Molten steel smelting: The mass fractions of C, Al, Mn, Si and B in molten steel obtained from smelting are respectively:

[0083] C: 0.03%, Al: 0.02%, Mn: 0.2%, Si: 0.05%, B: 0.005%.

[0084] (2) Continuous casting of molten steel: During the continuous casting process, the insertion depth of the nozzle is 100-150cm, and the casting speed of the casting machine is 1.5-1.7m / min;

[0085] The mass fraction of C in continuous casting mold flux is 2.7-3.3%, Na 2 The mass fraction of O is 7-8%, the melting range of the mold flux is 45-60° C., and the thickness of the liquid slag layer of the mold flux is 4-5 mm.

[0086] (3) Surface cleaning: the slab obtained in step (2) is surface-cleaned, and the cleaning depth of the surface cleaning is 2-3mm to ensure that there is no ob...

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Abstract

The invention provides a method for controlling occurrence rate of a strip-shaped chromatic aberration on surface of a pickled low-carbon aluminum killed steel, and belongs to the technical field of steel rolling. The method comprises the steps that molten steel is subjected to continuous casting, and a plate blank is obtained; the plate blank is subjected to surface cleaning, heating before rolling, rough rolling, finish rolling, cooling after rolling and coiling, and the low-carbon aluminum killed steel is obtained; the mass fraction of B in the molten steel is controlled to range from 0.001% to 0.005%; in the continuous casting process, the mass fraction of C in the casting powder is 2.7-3.3%, and the mass fraction of Na2O is 7-8%; the temperature of a soaking zone for heating before rolling is controlled to be 1250-1260 DEG C, the time of the soaking zone is controlled to be 30-40 min, and the total in-furnace time is controlled to be 160-200 min. The method can effectively reduce occurrence rate of strip-shaped chromatic aberration on the surface of the hot-rolled and pickled low-carbon aluminum killed steel, and improves surface quality of the hot-rolled and pickled low-carbon aluminum killed steel.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a method for controlling the occurrence rate of striped color difference on the surface of low-carbon aluminum-killed steel after pickling. Background technique [0002] As a new type of plate and strip production and development, pickling plate uses high-quality hot-rolled thin plate as raw material, and is used as a finished product after the oxide layer is removed by the pickling unit, trimmed, and finished. Its surface quality and use requirements are between hot-rolled plate Between and cold-rolled sheets, it is an ideal substitute for some cold-rolled sheets. The main uses of domestic hot-rolled pickling plates are: motorcycle body and structural parts, compressor shells in the home appliance industry, wheels, chassis and structural parts of passenger cars and cars, etc. Product features include: 1) Make up for the thick-gauge products that are difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111B22D11/16C22C38/02C22C38/04C22C38/06B21B1/22
CPCB22D11/111C22C38/02C22C38/04C22C38/06C22C38/002B22D11/16B21B1/22B21B2001/225B21B2261/20Y02P10/20
Inventor 王畅王林于洋刘珂郭子峰张亮亮高小丽刘文鑫王泽鹏张栋李高峰王鑫鑫陈瑾吴耐焦会立
Owner SHOUGANG CORPORATION
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