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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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...

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.

Application Domain

Furnace typesHeat treatment furnaces

Technology Topic

Carbon steelFuel oil +5

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Experimental program(1)

Example Embodiment

[0022] Example:

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

[0024] heating furnace

[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 of the walking heating furnace, the temperature of the billet is about 700°C or less, the maximum furnace temperature in the preheating section is controlled between 1050 and 1100°C, and the excess air coefficient in the furnace is controlled at Between 1.2 and 1.4. At this time, the original oxide layer on the surface of the billet is broken first, and a small part falls off.

[0028] ③When the 110mm×110mm billet is in the heating period of the walking furnace, the temperature of the billet is about 700-1250°C, the maximum furnace temperature is controlled between 1200-1250°C, and the excess air coefficient in the furnace is controlled between 1.2-1.4 between.

[0029] ④When the 110mm×110mm billet is in the heat preservation period of the walking heating furnace, the temperature of the billet is about 1150-1180°C, the maximum furnace temperature is controlled between 1150-1200°C, and the excess air coefficient in the furnace is controlled between 1.2-1.4 between.

[0030] The total heating time is 50-70 minutes.

[0031] After the steel billet heated by the above heating process is rolled into a φ6.5mm wire rod, the decarburization layer of the T11A steel is tested to be between 0.037mm and 0.097mm, with an average of 0.061mm.

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Classification and recommendation of technical efficacy words

short heating time
Energy saving

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

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Description & Claims & Application Information

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