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Heating method of preventing for high-carbon steel blank or steel ingot from decarbonizing

A heating method and billet technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as waste of energy, slow heating of billets, and insufficient oxygen, and achieve the effects of increased labor intensity, short heating time, and increased costs

Inactive Publication Date: 2003-08-27
攀枝花钢铁有限责任公司钢铁研究院
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of preventing decarburization with a reducing atmosphere in the soaking furnace is simple to operate, but the CO concentration in the furnace is high, which wastes energy. At this time, the amount of oxygen in the furnace is insufficient, and the air excess coefficient (air and fuel, such as gas, heavy oil etc.) is usually 0.9 to 1.2, which makes the heating of the billet slow, and the effect of preventing decarburization is not obvious; coating the surface of the billet with a protective coating has a good effect, but it is not suitable for large-scale production in the iron and steel industry, and increases Production costs and labor intensity of workers

Method used

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  • Heating method of preventing for high-carbon steel blank or steel ingot from decarbonizing
  • Heating method of preventing for high-carbon steel blank or steel ingot from decarbonizing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] When producing T11A (carbon range 1.05~1.14%) φ6.5mm wire rod figure 1 process flow.

[0024] heating furnace

Maximum furnace temperature °C

Maximum billet temperature ℃

Air excess coefficient

Total heating time (min)

Preheating section

Heating section

soaking section

1050～1100

1200～1250

1150～1200

≤700

700～1250

1150～1180

1.2～1.4

50～70

[0025] The specific description for the above table is as follows:

[0026] ①When the walking heating furnace heats a 110mm×110mm steel billet, in the three stages of preheating, heating period and holding period of the whole heating process, the strong oxidizing oxygen atmosphere of the method of the present invention is used for heating, and the air in the strong oxidizing atmosphere is excessive The coefficient (the ratio of air to gas) is controlled between 1.2 and 1.4.

[0027] ②When the 110mm×110mm billet is in the preheating period ...

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Abstract

The invention discloses heating method which can avoid decarbonization of high carbon billet or steel ingot. In the whole process of high carbon steel heating or preheating, heating, heat preservation period, it uses strong oxidizing gas to heat billet or steel ingot. The gas is controlled by air overplus coefficient, the coefficient (air and fuel, such as the ratio of coal gas, heavy oil) is 1.2-1.4.

Description

Technical field [0001] The invention belongs to a heat treatment method for steel, in particular to a method for preventing decarburization on the surface of a billet or an ingot during heating. Background technique [0002] In the heating process of high-carbon steel (such as heavy rail, carbon tool steel, bearing steel), preventing billet decarburization has always been an important issue that metallurgists need to solve. [0003] At present, the commonly used method is to control the atmosphere, heating time and heating temperature in the heating furnace. For example, according to the article "Research on Reducing the Decarburization Depth of Rails" in the second issue of "Steel, Vanadium and Titanium" in 2002, the longer the heating time and the higher the temperature, the deeper the decarburization layer of the rail. The reducing atmosphere in the soaking furnace is conducive to reducing the decarburization depth of the rail, and the decarburization depth of the rail c...

Claims

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Application Information

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IPC IPC(8): C21D1/74C21D9/70
Inventor 刘明姚永国陈小龙冯妍贾济海罗开金
Owner 攀枝花钢铁有限责任公司钢铁研究院
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