High-efficiency descaling method for iron oxide scale generated by hot-rolled short-process production line heating furnace

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

Active Publication Date: 2019-05-07
NORTHEASTERN UNIV
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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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  • High-efficiency descaling method for iron oxide scale generated by hot-rolled short-process production line heating furnace
  • High-efficiency descaling method for iron oxide scale generated by hot-rolled short-process production line heating furnace
  • High-efficiency descaling method for iron oxide scale generated by hot-rolled short-process production line heating furnace

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Experimental program
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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 set of air mist spraying devices are installed on the upper and lower sides of the roller table between the scale boxes. The number of spray heads is 25, and the angle of the air spray heads is 0°. The gas / water ratio in the device is 1:0, the gas flow rate of the nozzle is 350L / min, a...

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 set of air mist spraying devices are installed on the upper and lower sides of the roller table between the scale boxes. The number of spray heads is 50, and the angle of the air spray heads is 30°. The height of the device is 50mm from the billet surface and 3m from the ...

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 set of air mist spraying devices are installed on the upper and lower sides of the roller table between the scale boxes. The number of spray heads is 40, and the angle of the air spray heads is 15°. The height of th...

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Abstract

The invention provides a high-efficiency descaling method for an iron oxide scale generated by a hot-rolled short-process production line heating furnace, the method is used for realizing the completeremoval of the iron oxide scale in the heating furnace in the short-process production process through aerosol spraying and high-pressure water descaling. The method is based on the components of thehot-rolled steel plate, the heating system, the thickness of the furnace-generated iron oxide scale and the temperature range to adjust the gas-water ratio of a gas-mist spraying device, the height between the device and the steel plate and the distance between the device and the high-pressure descaling device, on the basis of the high-temperature plastic change interval of the iron oxide scale,huge heat stress is generated in the iron oxide scale in the rapid temperature change process is utilized, the integrity of the iron oxide scale can be rapidly dissociated in the non-plastic area of the iron oxide scale, the descaling efficiency of the iron scale of the short-process tunnel type heating furnace is improved by matching with the subsequent high-pressure water descaling, so that thepressing-in defects of the iron oxide skin are reduced, and the surface quality of the rolled steel produced by the hot-rolling short process is improved.

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 Applications(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
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