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Two-step blowing furnace outer refining process

An off-furnace refining and process technology, applied in the field of methods and powder injection, off-furnace refining, can solve the problems of high cost, limitation, silicon addition, etc., and achieve the effects of short process, saving operation time, and easy operation.

Inactive Publication Date: 2008-04-16
INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The efficiency of ladle feeding line is low, and the yield of alloy is low
The ladle is sprayed with CaSi, because CaSi contains a lot of silicon, which will increase the silicon in the steel, and the cost of CaSi is also high, so it is limited in the production of many steel types

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In a 150-ton ladle in a steel plant, the steel type is Q345B, the tapping temperature is 1670°C, the carbon is controlled at the lower limit, the tapping [O] is 550ppm, and the [S] is 280ppm. and then spray the desulfurization powder, the composition of the powder is: CaC 2 : 85%, CaCO 3 : 15%, the dosage of powder is 70kg, and finally spray calcium aluminate, the dosage is 150kg. The test results count 100 furnaces, the ladle sampling analysis [O] 11.5ppm, [S] 180ppm, the results of the oxygen and sulfur content in the steel are better than the traditional LF furnace refining process for 35-50min, and the shape of inclusions is also significantly better than that of the feeding line method.

Embodiment 2

[0018] In a 150-ton ladle in a steel plant, the steel type is Q345B, the tapping temperature is 1670°C, the carbon is controlled at the lower limit, the tapping [O] is 550ppm, and the [S] is 280ppm. and then spray the desulfurization powder, the composition of the powder is: CaC 2 : 95%, MgCO 3 : 5%, the dosage of powder is 70kg, and finally spray calcium aluminate, the dosage is 150kg. Statistical test results and ladle sampling analysis show that the oxygen and sulfur content in the steel is better than the traditional LF furnace refining process of 35-50min, and the inclusion form is also significantly better than the wire feeding method.

Embodiment 3

[0020] In a 150-ton ladle in a steel plant, the steel type is Q345B, the tapping temperature is 1670°C, the carbon is controlled at the lower limit, the tapping [O] is 550ppm, and the [S] is 280ppm. and then spray the desulfurization powder, the composition of the powder is: CaC 2 : 80%, Na 2 CO 3 : 20%, the dosage of powder is 70kg, and finally spray calcium aluminate, the dosage is 150kg. Statistical test results and ladle sampling analysis show that the oxygen and sulfur content in the steel is better than the traditional LF furnace refining process of 35-50min, and the inclusion form is also significantly better than the wire feeding method.

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PUM

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Abstract

The invention relates to a two-step blowing secondary refining process, wherein, during the first step, the compound powder of CaC2 and CaCO3, Na2CO3 or MgCO3 is injected into a ladle; after primary blowing, fluidization calcium metaaluminate 12CaO.7Al2O3 powder which is treated through crushing and passivation is injected into molten steel; moreover, the amount of each blown powder is determined according to different types of steel. Compared with the secondary refining processes such as LF furnace and ladle blowing of CaSi powder, the invention can substantially reduce technological operation time, increases operation efficiency and obtains satisfying refining effect.

Description

technical field [0001] The invention belongs to the field of metallurgy technology, and relates to the use of CaC 2 It is a method of refining outside the furnace and spraying powder. Background technique [0002] As we all know, currently in the converter smelting production process, more out-of-furnace refining processes are used, which is to use LF furnace to heat up molten steel and slag refining to remove inclusions, and sometimes further desulfurization and deoxidation treatment of molten steel is required. However, with the development of converter intensified smelting (electric furnace ultra-high power and molten iron) and high-speed continuous casting technology, the previous process of relying on LF furnace for refining outside the furnace can no longer be implemented. The main reason is that the LF furnace heats up the slag Refining takes a long time, and its production rhythm cannot meet the technological requirements of today's rapid steelmaking. The refining p...

Claims

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Application Information

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IPC IPC(8): C21C7/04
Inventor 孙中强
Owner INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
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