a blown co 2 Dynamic control method of stainless steel smelting process

A dynamic control, CO2 technology, applied in non-electric variable control, temperature control using electric mode, temperature control and other directions, can solve the problems of low decarburization rate of molten pool, insufficient stirring intensity, melting loss of furnace lining refractory, etc. Improve the smelting efficiency, improve the stirring performance of the molten pool, and reduce the effect of high temperature melting loss

Active Publication Date: 2021-08-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, compared with ordinary steel smelting furnaces, stainless steel smelting furnaces have low oxygen supply intensity, insufficient stirring intensity, long smelting cycle, and high furnace temperature, resulting in low decarburization rate of the molten pool during the smelting process, and the furnace lining refractories are under high temperature. The melting loss is serious, and the furnace life is generally not high

Method used

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  • a blown co <sub>2</sub> Dynamic control method of stainless steel smelting process
  • a blown co <sub>2</sub> Dynamic control method of stainless steel smelting process
  • a blown co <sub>2</sub> Dynamic control method of stainless steel smelting process

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Embodiment 1

[0037] The invention is applied to the refining process of a 180t AOD furnace, and the smelted product is 304 stainless steel. The smelting raw materials are stainless steel mother liquor and high-carbon ferrochrome, and the smelting time is set for the rapid decarburization period t 1 15min, the temperature control period set the smelting time t 2 8min, set the smelting time t in the deep decarburization period 3 for 15min, the proportionality factor R 1-CO2 Take the value of 0.1, R 3-CO2 Take the value of 0.05, R 3-N2 / Ar The value is 2. The specific smelting steps are as follows:

[0038] (1) The components of stainless steel mother liquor and high-carbon ferrochrome are obtained from the raw material acquisition system in the steelmaking control system, as shown in Table 1 and Table 2. The weight of the stainless steel mother liquor is 175t, and the preset target composition is shown in Table 3. The amount of steel is 180t.

[0039] Table 1 stainless steel mother liq...

Embodiment 2

[0050] The invention is applied to the 70t TSR stainless steel smelting process, and the smelted product is 410 stainless steel. The smelting raw materials are dephosphorized hot metal and high-carbon ferrochromium, and the smelting time is set for the rapid decarburization period t 1 20min, the temperature control period is set to smelting time t 2 10min, the deep decarburization period sets the smelting time t 3 is 22min, the proportionality factor R 1-CO2 Take the value of 0.1, R 3-CO2 Take the value of 0.06, R 3-N2 / Ar The value is 2. The specific smelting steps are as follows:

[0051] (1) The composition of dephosphorized hot metal and high-carbon ferrochrome obtained from the raw material acquisition system in the steelmaking control system is shown in Table 1 and Table 2. The weight of the stainless steel mother liquor is 66t, and the preset target composition is shown in Table 3. The target The tapping amount is 70t.

[0052] Table 1 Composition of dephosphorize...

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Abstract

The present invention proposes a CO injection 2 The invention relates to a dynamic control method for a stainless steel smelting process, belonging to the technical field of stainless steel smelting. During the oxidation period of the stainless steel smelting process, CO is dynamically regulated according to the composition and temperature of the molten pool 2 The injection flow rate is used to regulate the carbon-chromium reaction balance in the molten pool. When the carbon content of the molten pool ω[C]≥1.5%, a certain amount of CO is mixed according to the decarburization requirements 2 , improve the stirring performance of the molten pool and strengthen the decarburization reaction of the molten pool; when 0.5%≤ω[C]<1.5%, adjust the oxygen supply and CO according to the temperature and composition of the molten pool 2 Injection flow rate, CO utilization while continuous decarburization 2 The endothermic effect controls the temperature in the furnace to reduce the high-temperature melting loss of the lining refractory; when ω[C]<0.5%, calculate the oxygen supply and CO according to the target composition of molten steel 2 The injection flow rate controls the overall oxidation of the molten pool and injects N by mixing 2 / Ar reduces the partial pressure of CO in the furnace and reduces the oxidation and burning loss of chromium.

Description

technical field [0001] The invention mainly belongs to the technical field of stainless steel smelting, and specifically relates to a CO injection 2 A dynamic control method for the process of smelting stainless steel. Background technique [0002] In recent years, with the increasing market demand for stainless steel, the annual domestic production of stainless steel has also increased significantly. The important theoretical basis of stainless steel production is "decarburization and chromium preservation", that is, the carbon in molten iron needs to be reduced to a very low level, and at the same time, it is necessary to ensure that chromium in molten steel is not oxidized and enters the slag. Therefore, compared with ordinary steel smelting furnaces, stainless steel smelting furnaces have low oxygen supply intensity, insufficient stirring intensity, long smelting cycle, and high furnace temperature, resulting in low decarburization rate of the molten pool during the sme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D23/19C21C7/068
CPCC21C7/0685G05D23/1931
Inventor 魏光升周赟朱荣董凯陈培敦赵刚任鑫李伟峰王春阳陈一帆
Owner UNIV OF SCI & TECH BEIJING
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