Method for reducing chromatic aberration of cold rolled dual-phase steel

A dual-phase steel, color difference technology, applied in metal rolling, temperature control and other directions, can solve the problems of cold-rolled dual-phase steel color difference, etc., to achieve the effect of low strip temperature, reduced color difference, and optimized cold rolling reduction rate

Active Publication Date: 2017-05-31
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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  • Method for reducing chromatic aberration of cold rolled dual-phase steel
  • Method for reducing chromatic aberration of cold rolled dual-phase steel
  • Method for reducing chromatic aberration of cold rolled dual-phase steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Take the production of galvanized DP780 with a specification of 0.8mm*1480mm as an example. The smelting components for producing DP780 are specifically carbon C with a mass ratio of 0.145% to 0.165%, silicon Si at 0.45% to 0.55%, manganese Mn at 1.85% to 1.95%, phosphorus P less than or equal to 0.015%, and phosphorus P 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 less than or equal to 0.005% of nitrogen N.

[0067] Set the thickness of the hot-rolled sheet to 2.75mm. After the hot-rolled sheet is rolled to 2.75mm, the temperature compensation of the 30m part of the hot head and the 70m part of the hot tail is carried out at 30°C in the layer cooling equipment, and then the coiler is coiled The temperature is 550°C and coiled into rolls. Finally, galvanized DP780 is finally obtained through cold rolling process. image 3 shows a prior art galvanized DP780 surface, Figure 4 The surface of galvanized DP780 i...

Embodiment 2

[0069] Take the continuous retreat HC380 / 700DP with a production specification of 2.0mm*1048mm as an example. The smelting components for the production of continuous annealing HC380 / 700DP are specifically 0.08% to 0.10% C by mass ratio, 1.10% to 1.20% Si, 1.9% to 2.0% Mn, less than or equal to 0.020% of P, and less than or equal to 0.007% of 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. After the hot-rolled sheet is rolled to 4mm, the temperature compensation of the 30m part of the hot head and the 70m part of the hot tail is performed at 30°C in the layer cooling equipment, and then the coiling temperature is 520°C after passing through the coiler. ℃ coiled into rolls. Finally, the continuous annealing HC380 / 700DP is finally obtained through the cold rolling process. Figure 5 Shows the prior art continuous retreat HC380 / 700DP surface, Image 6 The surface of the continu...

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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 color difference of cold-rolled dual-phase steel. Background technique [0002] Cold-rolled dual-phase steel has the advantages of low yield point, high tensile strength, high initial work hardening rate, high elongation and smooth stress-strain curve, etc., and is often used in automobiles to reduce the weight of the car body. [0003] However, the cold-rolled dual-phase steel produced in the prior art often has color difference defects on the surface. Specifically, in the width direction, the color difference mainly exists in the strip, and there is no color difference on the surface of 0-350mm on both sides of the strip; in the length direction, the color difference is relatively light at about 200m from the head and tail of the strip, and the color difference in the middle is more serious. [0004] Therefore, there is a technical problem of how to re...

Claims

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Application Information

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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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