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Control method for edge quality of interstitial free (IF) steel and IF steel

A technology with no interstitial atoms and a control method, applied in the control of edge quality, in the field of IF steel, can solve problems such as edge defects

Active Publication Date: 2021-03-09
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method for controlling the edge quality of interstitial-free IF steel and IF steel to solve or partially solve the problem of easy generation of hot-rolled coils of IF steel Technical issues with edge defects

Method used

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  • Control method for edge quality of interstitial free (IF) steel and IF steel

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Effect test

Embodiment

[0054] The technical solution of the present invention is applied on the 2250 hot rolling production line of a certain steel factory, and the production data of 1045 coils of IF steel have been tracked, and its control process is as follows:

[0055] 1. Billet quality assurance

[0056] 1) The four corners of the slab are chamfered, and the lengths of the two right-angled sides of the chamfer are 30 and 35 respectively;

[0057] 2) The slab is machine-cleaned off the production line, and the surface layer of the 6 surfaces is removed by 3mm;

[0058] 3) Check the slab after machine cleaning, and the intersection edge is not allowed;

[0059] 4) Check the slab after machine cleaning, and the pinch depth of the crane on the side of the slab should not exceed 3mm;

[0060] 2. Heating process control

[0061] The furnace loading temperature is controlled at 425-636°C, the average furnace loading temperature is 473°C, the actual control range of the secondary heating temperature...

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Abstract

The invention discloses a control method for the edge quality of interstitial free (IF) steel. The control method comprises the steps that continuous casting is carried out on the IF steel, and this step comprises the following steps of chamfering a casting blank of the IF steel, and carrying out surface cleaning after the casting blank is taken off a production line; heating is carried out on thecasting blank of the IF steel, and this step comprises the following steps of controlling the temperature of the casting blank in a secondary heating section to be 1140-1170 DEG C and the temperatureof the casting blank in a soaking section to be 1160-1200 DEG C, and controlling the excess air coefficient of the soaking section to be 1.15-1.25; descaling is carried out on the casting blank of the IF steel, and this step comprises the following steps of putting a small-flow nozzle into use; rough rolling is carried out on the IF steel, and this step comprises the steps of carrying out purgingby using compressed air in the rough rolling process, and putting a roughing mill vertical roll into use for lubrication; and finish rolling is carried out on the IF steel, and this step comprises the steps of controlling the temperature difference between the two sides and the middle of an IF steel strip steel be within 10 DEG C, and controlling the reduction rate of an F1 rack to be 35%-45%. Bymeans of the control method, the defects of the hot-rolled edge of the IF steel are remarkably reduced, and the edge quality is guaranteed.

Description

technical field [0001] The present application relates to the technical field of hot-rolled strip steel, in particular to a method for controlling edge quality of interstitial-free IF steel and IF steel. Background technique [0002] With the rapid development of the automobile industry and the improvement of automobile quality requirements, the demand for interstitial atom-free IF steel for automobile outer panels is increasing, and the requirements for its surface quality are also getting higher and higher. Because of the extremely low carbon content and soft texture of IF steel, and the high austenite transformation temperature, edge defects are prone to occur. At present, edge defects are the largest defect affecting the quality improvement of the outer plate in the hot rolling process. Therefore, eliminating such defects is of great significance for improving product quality and meeting the requirements of automobile manufacturers. Contents of the invention [0003] ...

Claims

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Application Information

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IPC IPC(8): B21B1/46B21B1/26B21B37/22B21B45/08B21B45/02
CPCB21B1/463B21B1/26B21B37/22B21B45/08B21B45/0209
Inventor 焦会立辛艳辉罗旭烨刘丰李树强徐伟
Owner BEIJING SHOUGANG CO LTD
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