A high-efficiency descaling method for hot-rolled short-process production line furnace scale

A technology of iron oxide scale and process production line, which is applied in metal rolling, metal rolling, tool manufacturing, etc., and can solve the problems of difficulty in transforming the descaling system and low pressure of descaling water

Active Publication Date: 2021-04-06
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the hot rolling line is limited by the capacity of the existing pumping stations, there is little potential to increase the descaling water pressure
In addition, limited by the site and investment cost, it is difficult to upgrade the descaling system by adding pumping stations

Method used

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  • A high-efficiency descaling method for hot-rolled short-process production line furnace scale
  • A high-efficiency descaling method for hot-rolled short-process production line furnace scale
  • A high-efficiency descaling method for hot-rolled short-process production line furnace scale

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Effect test

Embodiment 1

[0059] A high-efficiency descaling method for hot-rolled short-flow production line furnace oxide scale. In the short-flow production line, an aerosol spraying device is installed between the heating furnace and the descaling box, and the composition of the billet is calculated by weight. The percentage contains C: 0.03%, Si: 1.5%, Mn: 2.5%, S: 0.015%, P: 0.019%, Als: 0.045%, the rest is Fe and unavoidable impurities during smelting, the thickness of the billet is 60mm, descaled The method specifically includes the following steps:

[0060] The steel billet is transported by rollers and heated in the tunnel heating furnace. The heating temperature is 1100°C and the heating time is 15 minutes. A group of aerosol spraying devices are installed on the upper and lower sides of the roller table between the scale boxes. The number of nozzles is 25, and the angle of the nozzles is 0°. The gas / water ratio in the device is 1:0, the gas flow rate of the nozzle is 350L / min, and the cool...

Embodiment 2

[0065] A high-efficiency descaling method for hot-rolled short-flow production line furnace oxide scale. In the short-flow production line, an aerosol spraying device is installed between the heating furnace and the descaling box, and the composition of the billet is calculated by weight. Percent contains C: 0.10%, Si: 1.5%, Mn: 0.15, S: 0.010%, P: 0.009%, Als: 0.015%, Ti: 0.08%, Nb: 0.08%, the rest is Fe and unavoidable during smelting Impurities. The billet thickness is 110mm, and the descaling method specifically includes the following steps:

[0066] The steel billet is transported by rollers and heated in the tunnel heating furnace. The heating temperature is 1250°C and the heating time is 60 minutes. A group of aerosol spraying devices are installed on the upper and lower sides of the roller table between the scale boxes. The number of nozzles is 50, and the angle of the nozzles is 30°. The height of the device is 50mm from the billet surface and 3m from the descaling b...

Embodiment 3

[0069] A high-efficiency descaling method for hot-rolled short-flow production line furnace oxide scale. In the short-flow production line, an aerosol spraying device is installed between the heating furnace and the descaling box, and the composition of the billet is calculated by weight. Percent contains C: 0.05%, Si: 1.0%, Mn: 1.5%, S: 0.013%, P: 0.015%, Als: 0.03%, Ti: 0.015%, Nb: 0.025%, the rest is Fe and unavoidable during smelting of impurities. The billet thickness is 80mm, and the descaling method specifically includes the following steps:

[0070] The steel billet is transported by rollers and heated in the tunnel-type heating furnace. The heating temperature is 1200°C and the heating time is 30 minutes, and then continues to be transported by rollers. A group of aerosol spraying devices are installed on the upper and lower sides of the roller table between the scale boxes. The number of nozzles is 40, and the angle of the nozzles is 15°. The height of the device is...

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Abstract

The invention relates to an efficient descaling method for furnace-grown scale in a short-flow hot-rolling production line. The method realizes the complete removal of furnace-grown scale in the short-flow production process through aerosol spraying and high-pressure water descaling. The method of the present invention is to adjust the gas / water ratio of the aerosol spray device, the height of the device from the steel plate and the distance between the device and the high-pressure descaling device according to the composition of the hot-rolled steel plate, the heating system, the thickness of the furnace oxide scale and the temperature range. and other parameters, based on the high-temperature plastic change range of the oxide scale, using the huge thermal stress generated by the oxide scale during the rapid temperature change process, the integrity of the oxide scale is quickly dissociated in the non-plastic zone of the oxide scale, and the subsequent high-pressure water descaling is used to improve the short process The descaling efficiency of the raw oxide scale in the tunnel heating furnace reduces the pressing defects of the oxide scale and improves the surface quality of the steel produced by the short process of hot rolling.

Description

Technical field: [0001] The invention belongs to the technical field of hot-rolled steel production, and in particular relates to an efficient descaling method for hot-rolled short-flow production line furnace-generated scale. Background technique: [0002] The short-process hot-rolled steel production line has advantages in the production of thin-gauge products, but the descaling performance is reduced due to low heating temperature and short time, and the number of descaling passes is less, which restricts the improvement of product surface quality. The surface defect rate of thin-gauge pickling board is even as high as nearly 90%, and downstream users refuse to use it. Therefore, it is a difficult problem in the industry to produce hot-rolled pickled plates with qualified surface quality in a short process. The continuous casting slab on the short-flow production line needs to be heated in a tunnel-type heating furnace before hot rolling. The heating temperature is 1100-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B45/04C22C38/02C22C38/04C22C38/06C22C38/14C22C38/12
Inventor 曹光明李志峰刘振宇崔春圆王皓于聪
Owner NORTHEASTERN UNIV LIAONING
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