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Heating method for controlling decarburization in heavy rail billet furnace

A heating method and billet technology, applied in furnaces, heat treatment furnaces, manufacturing tools, etc., can solve the problems of increased oxidative burning loss of steel billets or ingots, increased production costs, labor intensity, and not very obvious application results, and achieves low production costs. The effect of high furnace energy utilization and reduction of pollutant emissions

Inactive Publication Date: 2011-02-09
武钢集团有限公司
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AI Technical Summary

Problems solved by technology

The method of preventing decarburization with a weak oxidizing atmosphere in the soaking furnace is simple to operate, but due to insufficient combustion air, the fuel cannot be completely combusted, resulting in energy waste, and the exhaust gas discharged into the atmosphere has a high CO content, polluting the environment
The heating method using a strong oxidizing atmosphere in the furnace has caused an increase in oxidation and burning of the billet or ingot, reducing the yield of the product
Applying a protective coating on the surface of the steel billet has a good effect, but it increases the production cost and labor intensity of the workers, and is not suitable for large-scale production in the steel industry.
[0008] In addition, these three methods of preventing decarburization are mainly developed for the heating mode of traditional heating furnaces, and the application effect is not very obvious for the recently emerging energy-saving regenerative heating furnaces

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0021] When producing 50Kg / m grade U71Mn high-speed heavy rail (carbon content 0.68-0.74%), the rolling line method flow is: continuous casting slab raw material weighing → heating in the regenerative walking beam heating furnace → high pressure water descaling → BD1 blanking→BD2 special-shaped rolling→UEU tandem universal rolling→thermal printing→hot saw cutting head→stepping cooling bed cooling. The bloom (section size 380×280mm) coming from the continuous casting machine is heated in the regenerative walking beam heating furnace. Firstly, the heated steel billets are placed horizontally and loaded into the furnace, the wide side (where the side is 380mm) is horizontal, the narrow side (where the side is 280mm) is vertical, and the steel billets in the furnace are arranged with the minimum distance. Because the distribution of the decarburized layer on the surface of the billet is not evenly distributed during the heating process in the furnace, but shows a tendency that the...

Embodiment 2

[0024] During the heating process of the billet, the whole furnace maintains a positive pressure, and the furnace pressure measuring point is arranged in the middle of the furnace roof in the preheating section, and the furnace pressure control value is kept between 10-30Pa. The atmosphere in the furnace is adjusted by controlling the total air consumption coefficient of the whole furnace, and the control value is kept between 1.0-1.05. The section (when the billet temperature is ≥1000°C) is in a weakly reducing atmosphere, and the air consumption coefficient is controlled at about 1.0. The measured oxygen content of the comprehensive atmosphere in the furnace is between 0-2%. This atmosphere state ensures that the depth of the decarburization layer on the surface of the heated billet is controlled within the shallowest range, and at the same time ensures the complete combustion of fuel and improves energy utilization. and reduce pollutant emissions. During the heating proces...

Embodiment 3

[0026]During the heating process of the billet, the whole furnace maintains a positive pressure, and the furnace pressure measuring point is arranged in the middle of the furnace roof in the preheating section, and the furnace pressure control value is kept between 10-30Pa. The atmosphere in the furnace is adjusted by controlling the total air consumption coefficient of the whole furnace. The control value is kept between 1.0-1.05. The section (when the billet temperature is ≥1000°C) is under a weakly reducing atmosphere, and the air consumption coefficient is controlled at about 0.95. The measured oxygen content of the comprehensive atmosphere in the furnace is between 0-2%. This atmosphere state ensures that the depth of the decarburization layer on the surface of the heated billet is controlled within the shallowest range, and at the same time ensures the complete combustion of fuel and improves energy utilization. and reduce pollutant emissions. During the heating process...

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Abstract

The invention provides a heating method for controlling decarburization in a heavy rail billet furnace in a heat accumulation heating mode. The heating process comprises a pre-heating section, a heating section and a soaking section. A furnace pressure measurement point is positioned at the pre-heating section; the full furnace is controlled at positive pressure; when the billet temperature is controlled to be less than 1,000 DEG C, the atmosphere in the furnace is oxidizing atmosphere, and the air consumption coefficient is between 1.05 and 1.25; and when the billet temperature is controlledto be more than or equal to 1,000 DEG C, the atmosphere in the furnace is weak reducing atmosphere, the air consumption coefficient is between 0.9 and 1.0. Aiming at the operation and decarburizationcharacteristics of the heat accumulation heating furnace different from the traditional heating furnace, the segment control method is adopted on the control aspects of atmosphere in the furnace and temperature, and a limit low-oxygen concentration burning process is realized. The method has the advantages of low heated billet surface decarburization, low oxidized burning loss, high furnace energy utilization, low pollutant discharge, low production cost and the like, is simple, convenient and feasible, and can achieve good effect of saving materials and energy at the same time of improving the heating quality of products.

Description

technical field [0001] The invention belongs to the technical field of material heat treatment, and specifically refers to a heating method for controlling decarburization in a heavy rail billet furnace. Background technique [0002] Due to the high carbon content of heavy rail steel, it is easy to oxidize and decarburize during the heating process before rolling. The decarburization of the rail surface will cause the hardness of the rail surface to decrease, and at the same time, the wear resistance and peeling resistance will decrease, and the fatigue strength will also decrease. Therefore, how to effectively control the decarburization depth of heavy rail products has always been a technical difficulty in rail production. [0003] The main influencing factors for the formation of the surface decarburization layer during the heating process of the billet in the furnace are the atmosphere in the heating furnace, the heating time and the heating temperature. The longer the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D3/04C21D9/04
Inventor 丁翠娇周意平刘占增蒋扬虎黄浩宋中华陈超吉玉吴杰欧阳德刚陈胜杨超董茂松孙丽萍
Owner 武钢集团有限公司
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