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Heat treatment method for AHSS hot rolled coils, and cold rolling method using same and heat treatment apparatus

A heat treatment method and heat treatment device technology, applied in heat treatment furnaces, heat treatment equipment, workpiece cooling devices, etc., can solve the problems of inaccessible hot gas and scarce hot gas, achieve smooth circulation, maintain flow rate, and prevent wrinkles and poor shape.

Active Publication Date: 2016-09-07
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in this type of coil heating equipment, most of the hot air flows outside the sides and outer peripheral surfaces of the coil, so that the hot air flowing into the hollow portion of the coil is relatively scarce.
Additionally, the lower face of the coil is shielded by the coil saddle so hot air cannot reach it
Therefore, it is difficult to heat the coil uniformly as a whole, and there is a limitation in obtaining a uniform heat treatment effect as a whole

Method used

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  • Heat treatment method for AHSS hot rolled coils, and cold rolling method using same and heat treatment apparatus
  • Heat treatment method for AHSS hot rolled coils, and cold rolling method using same and heat treatment apparatus
  • Heat treatment method for AHSS hot rolled coils, and cold rolling method using same and heat treatment apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0107] Figure 11 It is a graph which compares and displays the material variation in the width direction of the hot-rolled coil heat-treated according to the examples of the present invention and the conventional situation. The steel type of the hot-rolled coil 20 is high tensile 980DP, and the size is 2150 mm in outer diameter, 762 mm in inner diameter, and 1200 mm in width. The applied heat treatment conditions are: cooling at room temperature for more than 48 hours after rolling, then reheating, and rapid cooling after holding at 550°C for 4 hours. The air-cooled material without any treatment after rolling has a material deviation of about 250 MPa or more between the edge and the center. When the conventional annealing box (box) is applied, the material deviation in the width direction is reduced to less than 150 MPa. Furthermore, it was confirmed that when the present invention was applied, material softening occurred at large edge portions, and therefore, the material ...

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Abstract

A heat treatment method for AHSS hot rolled coils is disclosed. The heat treatment method for the AHSS hot rolled coils, according to one embodiment of the present invention, comprises: a hot rolled coil production step of manufacturing a hot rolled coil by hot rolling a material to be rolled, cooling the same, and then winding the same; a first cooling step of cooling the hot rolled coil to a temperature at which the phase transformation thereof is completed, such that an edge portion of the hot rolled coil becomes hard; a hot rolled coil edge-strength softening step of heating only the edge portion of the hot rolled coil to a tempering temperature so as to raise the temperature thereof, and then maintaining the hot rolled coil at the tempering temperature for a predetermined time so as to thermally treat the hot rolled coil such that the edge portion of the hot rolled coil, having passed through the first cooling step, has strength similar to the strength of a center portion of the hot rolled coil; and a second cooling step of cooling the hot rolled coil having passed through the hot rolled coil edge-strength softening step.

Description

technical field [0001] The present invention relates to a heat treatment method for a hot-rolled coil and a heat treatment device for performing heat treatment by heating a wound coil. Background technique [0002] The hot rolling process implemented in the iron and steel preparation process is to reheat the slab prepared in the blast furnace to a temperature suitable for rolling in a heating furnace, and then pass it through a rough rolling mill (Roughing Mill) and a finishing mill (Finishing Mill). The series of rolling devices are used to roll hot-rolled steel plates in the form of strips, and after being cooled by cooling equipment, they are wound into coils by winders. Furthermore, the wound hot-rolled coils are stacked in a yard and air-cooled, and then transported to a cold-rolling factory or shipped as a product. [0003] In the air cooling process, the edge of the hot-rolled coil in contact with the atmosphere and the inside of the hot-rolled coil have material dev...

Claims

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Application Information

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IPC IPC(8): B21B37/74B21B45/02C21D9/56
CPCB21B37/74B21B45/0203C21D9/562B21C47/26C21D1/25C21D2221/02C21D2221/10C21D9/46C21D8/0205C21D11/00C21D1/767C21D9/0006C21D9/0056
Inventor 郑昌规金亨田刘智元
Owner POHANG IRON & STEEL CO LTD
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