A method for reducing the color difference of cold-rolled dual-phase steel

A dual-phase steel and color difference technology, applied in metal rolling, temperature control, etc., can solve the problems of cold-rolled dual-phase steel color difference, etc., and achieve the effect of low strip temperature, reduced transverse shear force, and reduced color difference

Active Publication Date: 2019-03-05
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the cold-rolled dual-phase steel produced in the prior art often has chromatic aberration defects on the surface

Method used

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  • A method for reducing the color difference of cold-rolled dual-phase steel
  • A method for reducing the color difference of cold-rolled dual-phase steel
  • A method for reducing the color difference of cold-rolled dual-phase steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Take galvanized DP780 with a production specification of 0.8mm*1480mm as an example. The smelting composition for producing DP780 is specifically carbon C with a mass ratio of 0.145% to 0.165%, silicon Si of 0.45% to 0.55%, manganese Mn of 1.85% to 1.95%, phosphorus P of less than or equal to 0.015%, and phosphorus of less than or equal to 0.007%. Sulfur S, 0.02% to 0.07% of aluminum Al, 0.25% to 0.35% of chromium Cr and 0.005% or less of nitrogen N.

[0067] The thickness of the hot-rolled sheet is set to 2.75mm, and after rolling the hot-rolled sheet to 2.75mm, the temperature compensation of 30°C is performed on the 30m part of the hot head and the 70m part of the hot tail in the layer cooling equipment, and then the coil is passed through the coiler to coil. The temperature is 550°C and coiled into rolls. Finally, the galvanized DP780 is finally obtained through the cold rolling process. image 3 A prior art galvanized DP780 surface is shown, Figure 4 The galvan...

Embodiment 2

[0069] Take the continuous retreat HC380 / 700DP with a production specification of 2.0mm*1048mm as an example. The smelting composition of HC380 / 700DP in production continuous retreat is 0.08%-0.10% C, 1.10%-1.20% Si, 1.9%-2.0% Mn, 0.020% or less P, and 0.007% or less S. , 0.020% to 0.060% of Al, 0.020% to 0.060% of Cr and less than or equal to 0.005% of N.

[0070] Set the thickness of the hot-rolled sheet to 4mm, and after rolling the hot-rolled sheet to 4mm, the temperature compensation of 30 m of the hot head and 70 m of the hot tail is carried out in the layer cooling equipment, and then the coiling temperature is 520 °C after passing through the coiling machine. ℃ Coiled into rolls. Finally, through the cold rolling process, the continuous withdrawal HC380 / 700DP is finally obtained. Figure 5 Shows the prior art continuation HC380 / 700DP surface, Image 6 The second embodiment shows that the surface of HC380 / 700DP is continuously retreated. It can be seen that the color...

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Abstract

The embodiment of the invention provides a method for reducing chromatic aberration of cold rolled dual-phase steel. The method is used for reducing chromatic aberration of the surface of the cold rolled dual-phase steel and comprises the steps that according to the needed thickness of a cold-rolled sheet, the thickness of a hot-rolled sheet is determined; according to the thickness of the hot-rolled sheet, a sheet blank is hot-rolled through a hot mill, and the hot-rolled sheet is obtained; the hot-rolled sheet is cooled in layer cooling equipment, and temperature compensation is conducted on at least one part in the hot head and a hot tail of the hot-rolled sheet; and the hot-rolled sheet is reeled into strip steel in a reeling machine.

Description

technical field [0001] The invention relates to the field of metal processing, in particular to a method for reducing the chromatic aberration of cold-rolled dual-phase steel. Background technique [0002] Cold-rolled dual-phase steels are often used in automobiles to reduce body weight due to their low yield point, high tensile strength, high initial work hardening rate, high elongation, and smooth stress-strain curve. [0003] However, the cold-rolled dual-phase steel produced in the prior art often has surface chromatic aberration defects. Specifically, in the width direction, the chromatic aberration mainly exists in the strip, and there is no chromatic aberration on the two sides of the strip at 0-350mm; in the length direction, the chromatic aberration is relatively light at about 200m from the head and tail of the strip, and the chromatic aberration in the middle is more serious. [0004] Therefore, the prior art has the technical problem of how to reduce the color d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/74
CPCB21B37/74B21B2261/20
Inventor 夏银锋艾矫健王晓东周旬王建功赵虎齐达李悦刘鸿明毕国喜范红妹林悦赵文姣
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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