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Low-carbon steel carbon content stably-controlled smelting method

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: 2019-11-19
ZENITH STEEL GROUP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Low-carbon steel carbon content stably-controlled smelting method
  • Low-carbon steel carbon content stably-controlled smelting method
  • Low-carbon steel carbon content stably-controlled smelting method

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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 crafts

[0043] (1) Converter

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

[0045] (2) LF refining

[0046] Deoxidation using aluminum particles and calcium carbide, calcium carbide is a carbon-containing material, and the deoxidizer brings a certain amount of carbon increase; the refining time is 40-65min, and the long refining time will easily cause the electrode to increase carbon; the soft blowing process uses all carbonized rice husks, resulting in a certain degree Carbon increase.

[0047] (3) Continuous casti...

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Abstract

The invention discloses a low-carbon steel carbon content stably-controlled smelting method. The smelting method includes converter smelting, LF refining and continuous casting. According to the method, by reasonably optimizing process parameters and enhancing process capability control, the carbon content can also be stably controlled within 0.05% without RH vacuum processing, the finished product carbon fluctuation range is small and is controlled at 0.03%-0.05%, the target value hit rate is high, product quality stability is facilitated, and judgement amending or scrapping caused by errantcomponents is reduced. The RH decarburization working procedure is not needed; by means of regulation and cooperation of all step conditions, the carbon steel carbon content is stably controlled at 0.03%-0.05%, and the inclusion content is low; and compared with frequently-used smelting process converter-RH decarburization-LF treatment-continuous casting, operation is easy, the production efficiency is high, and the cost of each ton of steel is effectively reduced.

Description

Technical field [0001] The invention relates to the technical field, and more specifically, to a smelting method for stably controlling the carbon content of low-carbon steel. Background technique [0002] Converter smelting low-carbon steel ([C]≤0.08%), the traditional low-carbon steel smelting process is converter-LF refining-continuous casting. This process may lead to high carbon content in the finished product, and the carbon fluctuates in a large range, and the carbon content is easy Extraordinary, which affects the use and production of customers; another smelting process of low-carbon steel is converter-RH decarburization-LF treatment-continuous casting. After the converter is tapped, the RH is directly applied to reduce the carbon content in the steel. , To achieve low-carbon control, but the use of RH vacuum treatment process directly led to a substantial increase in costs, resulting in a decline in production efficiency, and reduced the competitive advantage of product...

Claims

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Application Information

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Patent Type & Authority Applications(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
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