Heating method for preventing high carbon belt steel bloom decarburization

A heating method and billet technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as the reduction of steel yield and achieve the effects of improving recovery rate, reducing residence time, and reducing fuel consumption

Inactive Publication Date: 2008-06-11
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method produces a large amount of oxide scale on the surface of the billet or ingot, resulting in a reduction in the yield of steel

Method used

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  • Heating method for preventing high carbon belt steel bloom decarburization

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Adopt the technological process of accompanying drawing 1 when producing 65Mn (0.62~0.70% of carbon range) thickness to be 3.3mm * 325mm steel strip.

[0032] In the process step shown in Fig. 1, the walking beam type heating furnace heats a 120mm×360mm 65Mn high-quality carbon structural steel billet, and the method of the present invention is adopted. The billet is charged into the furnace by hot charging, and the temperature of the billet into the furnace is 500-550°C. In order to prevent severe decarburization on the surface of the 65Mn steel strip, the heating process parameters of the walking beam heating furnace are as follows:

[0033] heating furnace

[0034] During the heating process, a slight positive pressure (pressure of 10-40 Pa (gauge pressure)) and a weakly oxidizing atmosphere (mixed atmosphere of coke oven gas, blast furnace gas and air) are used, and the ratio of coke oven gas and blast furnace gas is 1:1. The excess air coefficient is 1.0...

Embodiment 2

[0036] Adopt the technological process of accompanying drawing 1 when producing 65Mn (0.62~0.70% of carbon range) thickness to be 3.3mm * 325mm steel strip.

[0037] In the process step shown in Fig. 1, the walking beam type heating furnace heats a 120mm×360mm 65Mn high-quality carbon structural steel billet, and the method of the present invention is adopted. The billet is charged into the furnace by cold charging, and the temperature of the billet into the furnace is 150-200°C. In order to prevent severe decarburization on the surface of the 65Mn steel strip, the heating process parameters of the walking beam heating furnace are as follows:

[0038] heating furnace

[0039] During the heating process, a slight positive pressure (pressure of 10-40 Pa (gauge pressure)) and a weakly oxidizing atmosphere (mixed atmosphere of coke oven gas, blast furnace gas and air) are used, and the ratio of coke oven gas and blast furnace gas is 1:1. The excess air coefficient is 1....

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Abstract

The invention discloses a heating method used for preventing the high carbon strip billet from decarburizing. The strip billet is heated in the heating furnace, and the heating process comprises the preheating period, heating period, and heat soaking period. The invention is characterized in that the micro positive pressure and the weak oxidizability environment are adopted during the heating process to heat the strip billet. In the invention method, the heating time is reduced, the standing time of the billet in the high temperature area is reduced, the depth of the decarburizing layer on the surface of the billet can be controlled in a shallow scope, the metal recovery ratio is enhanced; the fuel consumption is reduced, the energy is economized; and compared with the method of coating a protecting layer on the surface of the billet, the cost and the labor intensity are reduced.

Description

technical field [0001] The invention belongs to a method for preventing surface decarburization when a billet is heated. Background technique [0002] During the heating process of high carbon steel, preventing billet decarburization has always been an important issue that metallurgists need to solve. Some metallurgists apply a protective coating to the surface of high carbon steel to prevent billet decarburization. For example, according to the article "Research on Anti-Decarburization Protective Coating of High Carbon Steel" in the fourth issue of "Rolling Steel" in 1996, coating the surface of bearing steel with a protective layer can increase the qualified rate of decarburization by 20%. [0003] CN1127789 discloses a coating for preventing heating and oxidation of iron and steel materials, which is especially suitable for preventing high-carbon steel slabs from heating and oxidation and decarburization. It is composed of carbon-containing silica gel salt ore, glass, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/74C21D9/70
Inventor 亓伟伟周平汤化胜王奉县霍孝新王腾飞于全成
Owner LAIWU IRON & STEEL GRP
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