Control method for increasing painting performance and surface quality of cold rolling automobile sheet

A surface quality and control method technology, which is applied in the field of steel production, can solve the problems of low paintability and corrosion resistance, and achieve the effects of improving surface quality and production efficiency, improving reactivity and paintability, and improving quality

Active Publication Date: 2016-03-23
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of low paintability and low corrosion resistance of high cold-rolled automotive sheets

Method used

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  • Control method for increasing painting performance and surface quality of cold rolling automobile sheet
  • Control method for increasing painting performance and surface quality of cold rolling automobile sheet
  • Control method for increasing painting performance and surface quality of cold rolling automobile sheet

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The embodiment of the present invention provides a DC04 cold-rolled automobile steel sheet, whose chemical composition is shown in Table 1, and its surface quality control method includes the following steps:

[0021] 1. Heat the casting slab, in which the residual oxygen content of the heating furnace is 5%, the continuous casting slab is in the furnace for 230 minutes, and the furnace temperature is 1180°C.

[0022] 2. The heated cast slab undergoes rough rolling and finish rolling to obtain hot rolled plates, wherein the rough rolling outlet temperature is 1050°C, the final rolling temperature is 920°C, and the coiling temperature is 660°C; descaling process is used to control the scale.

[0023] 3. The hot-rolled coil is cold-rolled to obtain a chilled coil, the cold-rolling reduction rate is 82.5%, and the residual oil content on one side is 180mg / m 2 .

[0024] 4. Subjecting the chilled coil to continuous annealing treatment to obtain strip steel. During continuous anneal...

Embodiment 2

[0031] The embodiment of the present invention provides a DC04 cold-rolled automobile steel sheet, whose chemical composition is shown in Table 2, and its surface quality control method includes the following steps:

[0032] 1. Heat the casting slab, in which the residual oxygen content of the heating furnace is 6%, the continuous casting slab is in the furnace for 225 minutes, and the furnace temperature is 1180°C.

[0033] 2. The heated cast slab undergoes rough rolling and finish rolling to obtain hot-rolled plates, wherein the rough-rolling exit temperature is 1055°C, the final rolling temperature is 923°C, and the coiling temperature is 667°C; the descaling process is used to control the scale.

[0034] 3. The hot rolled coil is cold rolled to obtain a chilled coil, the cold rolling reduction ratio is 82.2%, and the residual oil content on one side is 160 mg / m2.

[0035] 4. Subjecting the chilled coil to continuous annealing treatment to obtain strip steel. During continuous anne...

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Abstract

The invention relates to a control method for increasing the painting performance and the surface quality of a cold rolling automobile sheet, which belongs to the technical field of steel production and is suitable for IF (Interstitial-Free) steel cold rolling automobile sheets. The control method comprises the steps of controlling components of continuous casting slabs; improving a reheating schedule of the continuous casting slabs, wherein the time inside a furnace is from 160 to 290 min, and the tapping temperature is from 1130 to 1220 DEG C; adjusting a dephosphorization process, wherein the pressure of each dephosphorization point is from 17 to 22 MPa; optimizing rolling temperature, wherein the outlet temperature for rough rolling is from 1020 to 1100 DEG C, and the final rolling temperature is from 900 to 940 DEG C; optimizing a continuous annealing process, wherein the O content of each zone of the furnace is from 0 to 20 ppm, the dew point temperature is from -70 to -40 DEG C, the H2 content is from 2% to 5%, the continuous annealing heating temperature is from 760 to 830 DEG C, an Ra value is from 0.7 to 1.3 mum after flattening, and an Rpc value is from 60 to 130. The control method has the advantages that existing equipment does not need to be upgraded, the components of the casting slabs are designed, and the processes are optimized, so that the surface quality and the painting performance of the cold rolling automobile sheet are effectively increased.

Description

Technical field [0001] The invention belongs to the technical field of steel production, and in particular relates to a control method for improving the surface quality of cold-rolled automobile plates that can be coated, and is suitable for IF steel cold-rolled automobile plates. Background technique [0002] The anti-corrosion of the car body is mainly achieved through painting. Therefore, painting is an important aspect of the car body manufacturing process. The quality of painting directly affects the corrosion resistance and decorative performance of the car body. During the painting process, a series of complex chemical reaction processes occur on the surface of the body material. As an important pretreatment method for painting, phosphating treatment has been widely used in the field of automobile production. Good quality of phosphating film is a favorable condition to ensure coating performance. [0003] The surface quality of cold-rolled automotive sheet is an important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/06C22C38/04C21D8/02C21D1/26
CPCC21D1/26C21D8/0226C21D8/0236C22C38/04C22C38/06C22C38/14
Inventor 杨建炜生海曹建平许静李涛刘立伟高立军郝玉林于东云
Owner SHOUGANG CORPORATION
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