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A smelting method for stable control of carbon content in low carbon steel

A technology of stable control and smelting methods, applied in the manufacture of converters, etc., can solve the problems of inclusion hazards, high deoxidation products, and high FeO, and achieve stable carbon control of finished products, stable product quality, and small fluctuations in carbon content.

Active Publication Date: 2020-08-07
ZENITH STEEL GROUP CORP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the traditional process, it is difficult to prepare low-carbon steel by using converter-LF refining-continuous casting, and the process of smelting low-carbon steel will bring high oxygen content, many deoxidized products, and high FeO in slag. The medium slagging process and the inclusions in the steel all bring great harm

Method used

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  • A smelting method for stable control of carbon content in low carbon steel
  • A smelting method for stable control of carbon content in low carbon steel
  • A smelting method for stable control of carbon content in low carbon steel

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Embodiment Construction

[0041] The smelting process of the present invention is briefly described as follows: converter smelting → LF refining → continuous casting

[0042] traditional craft

[0043] (1) Converter

[0044] Tapping target carbon control is 0.03% to 0.045%, tapping temperature ≥ 1600°C, the actual control of tapping carbon is high, and the instability of end point carbon increases the difficulty of refining control; low tapping temperature increases the range and duration of refining temperature rise, This leads to carbonization of the electrode.

[0045] (2) LF refining

[0046] Aluminum particles and calcium carbide are used for deoxidation. Calcium carbide is a carbon-containing material, and the deoxidizer brings a certain amount of carbon increase; the refining time is 40 to 65 minutes, and a long refining time will easily lead to carbonization of the electrode; the soft blowing process uses carbonized rice husks, resulting in a certain degree of carbon increase.

[0047] (3) ...

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Abstract

The invention discloses a smelting method for stably controlling the carbon content of low-carbon steel. The smelting methods are converter smelting, LF refining and continuous casting. In the present invention, by rationally optimizing process parameters and strengthening process capability control, the carbon content can be stably controlled within 0.05% without RH vacuum treatment, and the carbon fluctuation range of the finished product is small, controlled at 0.03-0.05%, and the target value hits The high rate is conducive to the stability of product quality and reduces the change of judgment or scrapping caused by out-of-standard ingredients. The invention does not require the RH decarburization process, and through the adjustment and mutual coordination of the conditions of each step, the carbon content of the low-carbon steel is stably controlled at 0.03-0.05%, and the inclusion content is low, which is comparable to the common smelting process converter-RH decarburization-LF treatment- Compared with continuous casting, the operation is simple, the production efficiency is high, and the cost per ton of steel is effectively reduced.

Description

technical field [0001] The invention relates to the technical field, in particular to a smelting method for stably controlling the carbon content of low-carbon steel. Background technique [0002] Low-carbon steel is smelted by converter ([C]≤0.08%). The traditional low-carbon steel smelting process is converter-LF refining-continuous casting. If it is out of line, it will affect the use and production of customers; another smelting process for low carbon steel is converter-RH decarburization-LF treatment-continuous casting. , to achieve low-carbon control, however, the application of the RH vacuum treatment process directly leads to a substantial increase in cost, a decrease in production efficiency, and a reduction in the competitive advantage of the product under the same quality conditions. [0003] When using traditional low-carbon smelting process conditions (converter-LF refining-continuous casting) to produce low-carbon steel with [C]≤0.08%, there is a large fluctua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C33/06C21C7/06C21C5/34
CPCC21C5/34C21C7/06C22C33/06C22C38/002C22C38/02C22C38/04C22C38/42
Inventor 沙鹏飞莫秉干孙光涛张正林沈艳
Owner ZENITH STEEL GROUP CORP CO LTD
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