Method for increasing heat source for half steel

A heat source and ladle technology, applied in the field of iron and steel smelting, can solve the problems of poor carbonization effect and high cost, and achieve the effects of good utilization rate, guaranteed utilization rate and good carbonization effect.

Inactive Publication Date: 2019-11-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
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Problems solved by technology

[0004] In order to solve the technical problems of high cost and poor carburizing effect in the prior art, the present invention provides a method for increasing the heat source of semi-steel. When the semi-steel molten iron satisfies any of the following conditions: A. Water C < 3.3%; B, semi-steel molten steel temperature < 1310 ° C, during the process of semi-steeling, spray carburant into the ladle through the injection system to supplement the heat source of semi-steel

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  • Method for increasing heat source for half steel

Examples

Experimental program
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Effect test

Embodiment 1

[0022] In a steel factory, semi-steel was produced from a 120-ton vanadium-extracting converter. The semi-steel molten iron was packaged with 140 tons of molten iron. After spraying 230kg of recarburizer powder, the composition of the semi-steel was compared before and after as shown in Table 1:

[0023] Table 1 Comparison of semi-steel composition and temperature before and after

[0024] semi-steel C / ％ Si / % V / ％ Mn / % temperature / ℃ Before carburization 3.29 0.02 0.03 0.02 1330 After carbonization 3.41 0.02 0.03 0.02 1325

[0025] In the process of semi-steel output from the vanadium extraction converter, the gas injection pressure of the auxiliary blowing system is 0.3Mpa, and the carburizer powder can smoothly enter the main pipeline. The injection pressure of the main blowing system is 0.55Mpa, and the injection speed of the carburizer is 50kg / min, the C content of the semi-steel is 3.3% before the injection of the carburizer, and o...

Embodiment 2

[0027] In a steel factory, 120 tons of vanadium-extracting converter produced semi-steel, and the semi-steel molten iron was filled with 140t of molten iron. After spraying 330kg of recarburizer powder, the composition of the semi-steel was compared before and after as shown in Table 2:

[0028] Table 2 Comparison of semi-steel composition and temperature before and after

[0029] semi-steel C / ％ Si / % V / ％ Mn / % temperature / ℃ Before carburization 3.2 0.02 0.03 0.02 1328 After carbonization 3.37 0.02 0.03 0.02 1325

[0030] In the process of semi-steel output from the vanadium extraction converter, the gas injection pressure of the auxiliary blowing system is 0.35Mpa, and the carburizer powder can smoothly enter the main pipeline. The injection pressure of the main blowing system is 0.57Mpa, and the injection speed of the carburizer is 55kg. / min, the C content of the semi-steel is 3.2% before the injection of the carburizer, and only 300k...

Embodiment 3

[0032] In a steel factory, semi-steel was produced from a 120-ton vanadium-extracting converter, and semi-steel molten iron was packaged with 140t of molten iron. After spraying 320kg of recarburizer powder, the composition of semi-steel was compared before and after as shown in Table 3:

[0033] Table 3 Comparison of semi-steel composition and temperature before and after

[0034] semi-steel C / ％ Si / % V / ％ Mn / % temperature / ℃ Before carburization 3.2 0.02 0.03 0.02 1330 After carbonization 3.34 0.02 0.03 0.02 1325

[0035] During the semi-steel production process of the vanadium extraction converter, the gas injection pressure of the auxiliary blowing system is 0.31Mpa, and the carburizer powder can smoothly enter the main pipeline. The injection pressure of the main blowing system is 0.52Mpa, and the injection speed of the carburizer is 50kg. / min, the C content of the semi-steel is 3.2% before the injection of the carburizer, and only ...

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Abstract

The invention discloses a method for increasing a heat source for half steel, and belongs to the technical field of iron and steel smelting. The technical problems that in the prior art, the half steel heat supplementing manner is high in cost and poor in carbonization effect can be solved. The method for increasing the heat source for the half steel is provided, when molten half steel meets the any one condition that A, C of the molten half steel is smaller than 3.3%, and B the temperature of the molten half steel is smaller than 1310 DEG C, in the half steel tapping process, through a blowing system, a carburant is blown into a steel ladle to supplement the half steel heat source, it can be ensured that within the molten half steel temperature range, rapid melting of the carburant can beachieved, the good use rate and the good carbonization effect are ensured, the carburant is cheap, and the raw material source is wide.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a method for increasing a heat source for semi-steel. Background technique [0002] Pangang Group and other blast furnaces using vanadium-titanium magnetite in Panxi area have low content of heating elements such as silicon and manganese in molten iron and high content of sulfur. In the process of vanadium extraction by converter, in order to better oxidize vanadium into vanadium slag, transitional deep blowing is often required to achieve the purpose of deep vanadium extraction; but the result of doing so often results in a large amount of oxidation of C content in semi-steel, In this way, semi-steel cannot meet the smelting conditions during converter steelmaking in the subsequent process, and forced steelmaking will cause the temperature or composition of molten steel at the end to fail to meet the requirements of the steel type, resulting in a seri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C22C37/10
CPCC21C7/0025C22C37/10
Inventor 梁新腾曾建华戈文荪陈均陈炼
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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