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A method for increasing the molten iron ratio of converter and reducing smelting cost

A technology of molten iron ratio and converter, which is applied in the field of metallurgy, and can solve the problems of high price of purchased scrap steel and large fluctuations in the quality of scrap steel

Active Publication Date: 2017-12-01
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the molten steel ratio in converter smelting is about 80-85%. The converter uses a large amount of purchased steel scrap. The quality of scrap steel fluctuates greatly, and the price of purchased scrap steel is relatively high.

Method used

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  • A method for increasing the molten iron ratio of converter and reducing smelting cost
  • A method for increasing the molten iron ratio of converter and reducing smelting cost
  • A method for increasing the molten iron ratio of converter and reducing smelting cost

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with specific embodiments.

[0029] A process for reducing smelting costs by increasing the ratio of molten iron in the converter. By increasing the charging ratio of molten iron in the converter, the operation of slag retention and less slag can be realized by using the excess heat. At the same time, the excess heat is used to reduce the cost of converter steel material, slag material, and medium cost, and realize the purpose of negative energy steelmaking, energy saving and emission reduction.

[0030] In this embodiment, 14207054 heats and steel grade S355J-2 of a steel company are selected, and the entire converter smelting process is controlled as follows:

[0031] (1) Steel type converter target composition (%)

[0032]

[0033] (2) The charging system of the metal material into the converter and the composition of the molten iron

[0034] Due to the need to increase the molten iron ratio, a...

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Abstract

The invention discloses a method for reducing the smelting cost by improving the molten iron ratio of a converter. The advantages of low price and stable quality of molten iron are used, the total recovery amount of scrap steel self-made in a company is calculated and the steel making molten iron ratio of the converter is improved to reduce the cost of a metal material entering the converter, excess heat brought by the molten iron is used, and the appropriate proportion of the molten iron entering the converter, slag residual and reducing operation, converter heat balance, converter slagging auxiliary material substitution and smelting process dephosphorization control are researched to reduce the converter steel and slag cost and the medium cost in order to realize negative energy steel making, energy saving and emission reduction.

Description

technical field [0001] The invention belongs to a steelmaking process in the field of metallurgy, and in particular relates to a steelmaking method for reducing smelting costs. Background technique [0002] At present, the molten steel ratio of converters is about 80-85%. The converters use a large amount of purchased steel scrap. The quality of scrap steel fluctuates greatly, and the price of purchased scrap steel is relatively high. On the contrary, the price of iron ore continues to fall, and the price of molten iron is low and the quality is stable. According to the current market situation, how to make full use of the advantages of molten iron, avoid using a large amount of purchased scrap steel, ensure the stability of the process and reduce the cost of smelting, and become a steel mill. important research topic. Contents of the invention [0003] The purpose of the present invention is to provide a steelmaking method, fully utilizing the advantages of stable molten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30
CPCY02P10/20
Inventor 吴国平蔡可森王攀峰周桂成曹余良张小伟
Owner NANJING IRON & STEEL CO LTD
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