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Low carbon low silicon-aluminum killed steel converter refining production process

A technology of aluminum killed steel and converter refining, which is applied in the field of metallurgy, can solve the problems of affecting the oxygen content of molten steel in converter tapping, unfavorable converter slag-less smelting, and increasing the consumption of refractory materials, so as to increase the service life of the converter and reduce the oxygen blowing time , the effect of reducing the consumption of refractory materials

Active Publication Date: 2017-06-23
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In today's intensified product competition, this production organization mode has become a bottleneck restricting the development of enterprises. This production mode is not conducive to the slag-less smelting of the converter, affects the furnace life of the converter, increases the consumption of refractory materials, and affects the oxygen content and oxygen content of the molten steel in the converter. Reduced scrap ratio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The 100t converter refining production process of low-carbon, low-silicon and aluminum-killed steel is operated according to the following steps:

[0020] 1. Converter slag-making materials are lime, limestone and light-burned dolomite. The total amount of slag-making materials added is 5t, limestone is 2t, limestone is 1t, light-burned dolomite is 2t, and slag-making materials are added in two batches after the oxygen lance is ignited. , the first batch of 2.7t slagging material is added, the second batch of 2.3t slagging material is added, the adding time interval is 3 minutes, and each batch of feeding is divided into 2-3 times;

[0021] 2. The tapping temperature of the converter is controlled at 1640°C-1660°C;

[0022] 3. The position of the blowing gun is controlled as low (200cm)-high (300cm)-low (150cm)-high (280cm), and the carbon pulling time is 2 minutes;

[0023] 4. Connect the bottom blowing argon hose to the bottom blowing argon hose after the steel is ta...

Embodiment 2

[0027] The 100t converter refining production process of low-carbon, low-silicon and aluminum-killed steel is operated according to the following steps:

[0028] 1. Converter slag-making materials are lime, limestone and light-burned dolomite. The total amount of slag-making materials added is 6t, limestone is 3t, limestone is 1t, light-burned dolomite is 2t, and the slag-making materials are added in two batches after the oxygen gun is ignited. Add 4t of slagging material in the first batch, add in 3 times, each addition is not more than 3t, add 2t of slagging material in the second batch, add in 2 times, and the time interval between the two batches is 4 minutes;

[0029] 2. The tapping temperature of the converter is controlled at 1640°C-1660°C;

[0030] 3. The position of the blowing gun is controlled as low (150cm)-high (300cm)-low (180cm)-high (280cm), and the carbon pulling time is 3 minutes;

[0031] 4. Connect the bottom blowing argon hose to the bottom blowing argon...

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Abstract

The invention relates to a low carbon low silicon-aluminum killed steel converter refining production process. Converter slag-making materials are added in two batches, and the steel tapping temperature of a converter is controlled between 1640 DEG C-1660 DEG C; in the blowing process, the lance position is controlled as low-high-low-high, and meanwhile it is guaranteed that the catch carbon time is larger than or equal to 2 minutes; after steel tapping of the converter is completed, a steel ladle is refined, then an argon bottom blowing flexible pipe is connected, strong argon blowing is adopted, when the steel liquid surface surges, the argon blowing flow is adjusted to be lower, and it is guaranteed that molten steel does not overflow the steel ladle; for the slag-making stage, the slag-making material are added for two times, after the slag-making materials are added, argon bottom blowing strong stirring is adopted, the argon blowing time is 3 min-10 min, and the slag sample taking frequency is 4-5 times; and when top slag is turned from original black to green, argon bottom blowing stirring is stopped, then steel liquid temperature measurement and sampling are conducted, and after steel liquid temperature measurement and sampling, the argon bottom blowing flow is adjusted to the weak blowing state. The production process is beneficial to smelting less slag of the converter, increasing the age of the converter, reducing consumption of refractory materials, reducing the oxygen content of molten steel of steel tapping in converter, increasing the ratio of scrap steel, and reducing production cost.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a low-carbon, low-silicon, aluminum-killed steel converter refining production process. Background technique [0002] At present, in the production of low-carbon, low-silicon and aluminum-killed steel, there are problems with the transportation distance of molten steel, the transfer time of molten steel is long (90 minutes), and the temperature drop of molten steel is large. 1680°C) process method operation. [0003] In today's intensified product competition, this production organization mode has become a bottleneck restricting the development of enterprises. This production mode is not conducive to the slag-less smelting of the converter, affects the furnace life of the converter, increases the consumption of refractory materials, and affects the oxygen content and oxygen content of the molten steel in the converter. Reduced scrap ratio. Contents of the invention [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/30C21C5/36C21C7/072
CPCC21C5/28C21C5/30C21C5/36C21C7/072
Inventor 王晗桐姚伟智梅雪辉李泽林臧绍双许海亮王荣
Owner ANGANG STEEL CO LTD
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