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Production device, preparation method and use method of low-nitrogen carburant for clean steel refining

A technology of nitrogen recarburizer and production equipment, which is applied in the fields of carbon and iron and steel metallurgy, can solve the problems of limited sources, high price, and cannot meet the needs of high-quality low-nitrogen steel production, and achieves improved steel quality, low price, and calcination. good effect

Inactive Publication Date: 2013-06-19
BEIJING SINOSLAG METALLURGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The source of this raw material is limited and expensive, which is far from meeting the demand for high-quality low-nitrogen steel production.

Method used

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  • Production device, preparation method and use method of low-nitrogen carburant for clean steel refining
  • Production device, preparation method and use method of low-nitrogen carburant for clean steel refining

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] Example 1 In order to reduce the nitrogen content of GCr15 bearing steel, when smelting bearing steel (GCr15) in a 60t converter, 10 heats were used to replace ordinary carburizers with low-nitrogen carburizers to increase the carburization of molten steel. The carbon in the steel was changed from the average 0.14% is increased to 0.88%, and 6.36 kg of low-nitrogen recarburizer needs to be added per ton of molten steel. The test results show that the nitrogen content in bearing steel can be reduced by 50ppm from the level of nearly 100ppm by using low-nitrogen carburizer.

example 2

[0037] Another test was carried out on a 100t converter. The smelting steel was No. 45 high-quality carbon structural steel. The test furnace was 12 furnaces. The amount of steel added per ton was 5kg. Reduce nitrogen content by 31ppm, a drop of 54%.

example 3

[0039] The third example test was carried out on a 100t converter, the smelting steel type was No. 75 hard wire steel, the test furnace was 8 furnaces, and the amount of steel added per ton was 7kg. Nitrogen levels dropped by 54% to the ideal level of 44ppm.

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Abstract

The invention discloses a production device, a preparation method and a use method of a low-nitrogen carburant for clean steel refining, belongs to the field of carbon and ferrous metallurgy, and relates to a method for reducing nitrogen content in steel and improving molten steel quality. The preparation method of the low-nitrogen carburant for clean steel refining is characterized in that according to the Henry's law (which is a theory related to solubility of gas in solid), nitrogen is removed from petroleum tar coke by a high temperature and then the petroleum tar coke is cooled to a natural temperature by a quenching method so that carburant nitrogen content is reduced and the excellent low-nitrogen carburant for clean steel refining is obtained. Compared with the common carburant, the low-nitrogen carburant for clean steel refining has very low nitrogen content and thus the low-nitrogen carburant can carry a small amount of nitrogen into steel so that steel nitrogen content is reduced. The low-nitrogen carburant for clean steel refining has fixed carbon content more than 97wt%, ash content less than 1.5wt%, volatile content less than 1.0wt%, sulfur content of 0.3wt% and nitrogen content less than 0.02wt%.

Description

technical field [0001] The invention belongs to the field of carbon and iron and steel metallurgy, and particularly relates to a carburizer material for producing pure steel grades with extremely low nitrogen content in the steelmaking process of iron and steel enterprises. Compared with it, it has the effect of greatly reducing the nitrogen content in steel. technical background [0002] Carburizer is one of the essential auxiliary materials in steelmaking production. Ordinary carburizers have a high nitrogen content (1.0-3.0%wt), so they can complete the task of carburizing molten steel during the steelmaking process and meet the requirements of qualified molten steel. At the same time, it also brings a large amount of harmful element nitrogen into the steel, which seriously affects the quality of the steel. [0003] At present, the recarburizers used by manufacturers of high-quality carbon steel and low-nitrogen steel in the world are formed by crushing the debris genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00
Inventor 牛四通牛士珍
Owner BEIJING SINOSLAG METALLURGICAL TECH
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