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Molten steel predeoxidation process in molten iron steel refining converter

A steelmaking converter and pre-deoxidation technology, applied in the field of metallurgical steelmaking, can solve problems such as unsatisfactory deoxidation efficiency, achieve the effect of guaranteeing cutting performance and welding performance, and improving deoxidation efficiency

Active Publication Date: 2020-04-10
LIAONING INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the deoxidation efficiency of the

Method used

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  • Molten steel predeoxidation process in molten iron steel refining converter

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Experimental program
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Effect test

Embodiment 1

[0026] 1) At the end of steelmaking converter smelting, a vacuum deoxidation process is first performed on the converter for vacuum deoxidation. Based on 100 tons of molten steel, the converter is pumped to a vacuum of 67-70pa. The balance of carbon and oxygen in the molten steel is destroyed, causing Carbon and oxygen continue to react to form carbon monoxide gas, and the bubbles of carbon monoxide float up to drive the stirring of the molten steel, making the composition and temperature environment of the molten steel in the converter tend to a balanced state; until the carbon in the molten steel reaches below 0.01%;

[0027] 2) Put 9 tons of SiC and 9 tons of CaC2 into the converter, and carry out a diffusion deoxidation process by means of bottom blowing argon stirring.

[0028] 3) Put 5 tons of CaC2 deoxidizer into the converter again, and carry out a deoxidation process by means of bottom blowing argon stirring, the blowing flow rate of bottom blowing argon stirring is 0....

Embodiment 2

[0033] 1) At the end of steelmaking converter smelting, a vacuum deoxidation process is first performed on the converter for vacuum deoxidation. Based on 100 tons of molten steel, the converter is evacuated to a vacuum of 130-134pa. The balance of carbon and oxygen in the molten steel is destroyed, causing Carbon and oxygen continue to react to form carbon monoxide gas, and the bubbles of carbon monoxide float up to drive the stirring of the molten steel, making the composition and temperature environment of the molten steel in the converter tend to a balanced state until the carbon in the molten steel reaches below 0.01%;

[0034] 2) Put 10 tons of SiC and 10 tons of CaC2 into the converter, and carry out a diffusion deoxidation process by means of bottom blowing argon stirring, the flow rate of bottom blowing argon stirring is 0.5Nm3 / min, and the blowing time of argon is 10min;

[0035] 3) Put 8 tons of deoxidizer CaC2 into the converter again, and carry out a deoxidation pro...

Embodiment 3

[0040] 1) At the end of the steelmaking converter smelting, a vacuum deoxidation process is first performed on the converter for vacuum deoxidation. Based on 100 tons of molten steel, the converter is evacuated to a vacuum of 100-105pa. The balance of carbon and oxygen in the molten steel is destroyed, causing Carbon and oxygen continue to react to form carbon monoxide gas, and the bubbles of carbon monoxide float up to drive the stirring of the molten steel, making the composition and temperature environment of the molten steel in the converter tend to a balanced state until the carbon in the molten steel reaches below 0.01%;

[0041] 2) Put 9.5 tons of SiC and 9.5 tons of CaC2 into the converter, the gas blowing flow rate of bottom blowing argon stirring is 0.4Nm3 / min, the blowing time of argon gas is 8min, and the method of bottom blowing argon stirring is used to carry out a diffusion deoxidation process;

[0042] 3) Put 6 tons of deoxidizer CaC2 into the converter again, a...

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Abstract

The invention belongs to the technical field of metallurgical steel refining, particularly relates to a molten steel predeoxidation process in a molten iron steel refining converter. The predeoxidation process is performed at the converter steel refining terminal; and the predeoxidation process adopts a combined deoxidation mode, that is, a primary vacuum deoxidation process, a primary dispersiondeoxidation process, a primary precipitation deoxidation process, a secondary vacuum deoxidation process, a secondary dispersion deoxidation process and a secondary precipitation deoxidation process are performed in sequence. After molten steel deoxidized by the method is tapped, the molten steel is more stable and quicker in film formation after slag is poked away, the film formation process is more stable, and formed films are more smooth. Molten steel samples are detected by adopting an oxygen meter to obtain the converter terminal oxygen of the molten steel treated by the method as 10-40 ppm.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and steelmaking, and in particular relates to a molten steel pre-deoxidation process in a molten iron steelmaking converter. Background technique [0002] The vanadium-containing hot metal smelted in the blast furnace is rich in V and Ti resources, and the vanadium-containing hot metal needs to be extracted by the vanadium-extracting converter before steelmaking. A certain amount of coolants such as iron blocks and iron balls need to be added to the vanadium extraction converter for vanadium extraction. After the vanadium extraction operation, V, Ti, Si, Mn and other heating elements are basically oxidized to trace amounts, and the C content is 3.6-3.8 %, the molten iron after vanadium extraction is commonly known as semi-steel, and the semi-steel is smelted in the converter. Due to the limitation of the insufficient heat of the semi-steel, the average dissolved oxygen in the molten steel at th...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/10
CPCC21C7/06C21C7/10
Inventor 孙野张作良陈韧刘研刘冰李晓亮李玲玲崔研张馨雅
Owner LIAONING INST OF SCI & TECH