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Decarburizing process for waste steel resmelting

A technology for re-smelting and scrap steel, which is applied in the field of steelmaking, can solve the problems of material waste, cost increase of castings, time-consuming and other problems, and achieve the effect of optimizing decarburization process, reducing raw material cost and improving decarburization effect

Inactive Publication Date: 2017-06-13
SHENYANG ZHUMENG HEAVY IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is time-consuming and material-intensive, and the casting cost increases

Method used

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  • Decarburizing process for waste steel resmelting

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Embodiment Construction

[0017] In order to further illustrate the technical means adopted by the present invention and its effects, the following describes in detail in conjunction with preferred embodiments of the present invention and accompanying drawings.

[0018] see figure 1 , the decarburization process of scrap steel melting again, it is characterized in that, the step comprises:

[0019] Step 1. According to the composition of the furnace charge, calculate the amount of furnace charge;

[0020] Step 2. After the charge is melted, take a sample and analyze whether the carbon content exceeds the standard;

[0021] Step 3, the carbon content exceeds the standard, and calculate the amount of gas cutting slag according to the amount of carbon that can be removed by 0.03-0.05 per kilogram of gas cutting slag;

[0022] Step 4. When the temperature of molten steel in the furnace reaches above 1550 degrees, add gas cutting slag in batches and stir at the same time to avoid violent boiling;

[0023...

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Abstract

The invention discloses a decarburizing process for waste steel resmelting. The process comprises the following steps: (1) a burden feeding quantity is calculated according to components of a prepared burden; (2) the burden is sampled to analyze if the carbon content is excessive after melting down; (3) if the carbon content is excessive, the quantity of gas cutting slag is calculated according to removal of 0.03-0.05 of carbons in each kg of gas cutting slag; (4) when the temperature of molten steel in a furnace reaches above 1550 DEG C, the gas cutting slag is fed in batches for synchronously stirring to prevent acute boiling; (5) when the carbon content in the molten steel is still not lower than 0.090 wt%, and the oxygen content is not beyond 350 ppm, the top gun oxygen blowing is performed for the molten steel to forcedly decarburize; (6) the molten steel is naturally decarburized by 15-17 min; and (7) after the carbon content of the molten steel is qualified, broken glass is added to cover the molten steel; and after the temperature of the molten steel is lowered to reach the pouring requirements, the tapping is performed. The decarburizing process for waste steel resmelting performs decarburization by different modes according to the carbon content of the molten steel, is optimized, improves the decarburizing effect, and cannot increase the deoxidation burden.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a carbon removal process for remelting scrap steel. Background technique [0002] Usually, scrap steel needs to be smelted and then remade. In the past, when the intermediate frequency furnace was used to smelt steel, it was necessary to calculate the molten steel fed into the furnace. However, in recent years, the source of steel scrap has been complicated and the mixture has been serious. Although it has been calculated before smelting, after melting, the carbon content exceeds the standard. When the carbon content exceeds the standard, in order to reduce the carbon content, part of the molten steel should be poured out, and then low-carbon scrap steel should be added for remelting. This method is time-consuming and material-intensive, and the casting cost increases. After a period of experimental research, we have found a new method of using carbon steel gas cutting slag...

Claims

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Application Information

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IPC IPC(8): C21C7/068
CPCY02P10/20
Inventor 许广旭
Owner SHENYANG ZHUMENG HEAVY IND CO LTD
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