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Heat treatment method of ahss hot-rolled coil, cold rolling method and heat treatment device using the same

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, and achieve the effect of smooth circulation, maintaining flow rate, and uniform heating

Active Publication Date: 2019-12-24
浦项股份有限公司
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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 of ahss hot-rolled coil, cold rolling method and heat treatment device using the same
  • Heat treatment method of ahss hot-rolled coil, cold rolling method and heat treatment device using the same
  • Heat treatment method of ahss hot-rolled coil, cold rolling method and heat treatment device using the same

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Experimental program
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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 of the AHSS hot-rolled coil according to the embodiment of the present invention includes: a hot-rolled coil generation step, hot-rolling and cooling the rolled material, and then coiling to prepare the hot-rolled coil; the first cooling step , cooled to the temperature at which the phase transformation is completed, so as to generate a hard phase at the edge of the hot-rolled coil; in the step of weakening the edge of the hot-rolled coil, only the edge of the hot-rolled coil is heated and heated to the tempering temperature, The heat treatment is then maintained at the tempering temperature for a predetermined time so that the edge portion of the hot-rolled coil subjected to the first cooling step has a strength similar to that of the central portion of the hot-rolled coil; the second cooling step, The hot-rolled coil subjected to the step of weakening the edge strength of the hot-rolled coil is cooled.

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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Patent Type & Authority Patents(China)
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 浦项股份有限公司
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