A method for improving the service life of the converter lining in the production of low-carbon and low-phosphorus steel

Abstract

The invention belongs to the technical field of metallurgy, and relates to a method for increasing the service life of a converter lining in the production of low-carbon and low-phosphorus steel. Specifically: when the converter is blowing, add part of the slagging material, adjust the distance from the oxygen lance to the liquid surface, and control the flow rate of oxygen and bottom blowing; during blowing: add the returned ore slag and the remaining slagging material in stages; at the end point: Adjust the distance from the gun position to the liquid level, control the flow rate of oxygen and bottom blowing; control the basicity of slag at the end point, the control range of carbon measured by TSO at the end point is 0.036-0.056%, and control the temperature below 1640°C; control stirring before tapping to reduce steel The carbon content in the liquid is 0.005% or above, and the steel tapping requirements are met when the steel tapping control range is below 0.035%. The method significantly reduces the lining erosion in the blowing process, and at the same time improves the final slag system of the converter, creates good slag splashing conditions for the slag splashing system, greatly improves the service life of the furnace lining, and reduces production costs at the same time.

Description

technical field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for increasing the service life of a converter lining in the production of low-carbon and low-phosphorus steel, which can increase the service life of the converter lining when low-carbon and low-phosphorus steel is smelted. Background technique

[0002] At present, the shortcomings of the existing production technology of low-carbon and low-phosphorus steel are: in order to achieve rapid decarburization and dephosphorization in actual production, the process and end point control slag has strong oxidative properties, which leads to relatively heavy corrosion of the furnace lining. Especially the slag line is severely eroded, the slag is highly oxidizable, and the consumption of steel materials is high. At the same time, the slag splashed is relatively thin, the slag splash time is long, and the slag splash layer of the furnace lining is thin, which is not ...

Examples

Embodiment 1

[0038] S1) When the lower gun of the converter is turned on, all the lime in the slagging material is added at 36.8kg / t, the light burnt magnesium ball is added at 9.3kg / t, the limestone is added at 10kg / t for 60% of the total amount, and the dolomite is added at 16.5 Add 60% of the total amount in kg / t, adjust the distance between the oxygen lance and the liquid surface to 1.5m, and control the oxygen flow rate to 31500m 3 / h and bottom blowing flow rate is 300m 3 / h;

[0039] S2) During the blowing process: add the remaining slagging material and coolant in stages, control the temperature in the TSC period to 1575°C, the slag basicity at the end point is 3.5-4.0, the carbon measured by TSO at the end point is controlled at 0.041%, and the temperature is controlled at 1632°C;

[0040] The addition amount of the coolant is 10-20kg / t, and the addition method is: add in batches: add 30% in the middle period before blowing, add 50% in the middle period of blowing, and add 20% in...

Embodiment 2

[0046] S1) When the lower lance of the converter is turned on, all the lime in the slagging material is added at 35.76kg / t; Add 60% of the total amount at 18kg / t, adjust the distance between the oxygen lance and the liquid surface to 1.4m, and control the oxygen flow rate to 31000m 3 / h and bottom blowing flow rate is 280m 3 / h;

[0047] S2) During the blowing process: add the remaining slagging material and coolant in stages, control the temperature in the TSC period to 1564°C, the slag basicity at the end point is 3.5-4.0, the carbon at the end point TSO is controlled at 0.039%, and the temperature is controlled below 1639°C ;

[0048] The addition amount of the coolant is 10-20kg / t, and the addition method is: add in batches: add 30% in the middle period before blowing, add 50% in the middle period of blowing, and add 20% in the middle and late period of blowing; the coolant includes ore, sinter and return;

[0049] In the remaining slagging material, limestone is added...

technical field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for increasing the service life of a converter lining in the production of low-carbon and low-phosphorus steel, which can increase the service life of the converter lining when low-carbon and low-phosphorus steel is smelted. Background technique

[0002] At present, the shortcomings of the existing production technology of low-carbon and low-phosphorus steel are: in order to achieve rapid decarburization and dephosphorization in actual production, the process and end point control slag has strong oxidative properties, which leads to relatively heavy corrosion of the furnace lining. Especially the slag line is severely eroded, the slag is highly oxidizable, and the consumption of steel materials is high. At the same time, the slag splashed is relatively thin, the slag splash time is long, and the slag splash layer of the furnace lining is thin, which is not ...

Examples

Embodiment 1

[0038] S1) When the lower gun of the converter is turned on, all the lime in the slagging material is added at 36.8kg / t, the light burnt magnesium ball is added at 9.3kg / t, the limestone is added at 10kg / t for 60% of the total amount, and the dolomite is added at 16.5 Add 60% of the total amount in kg / t, adjust the distance between the oxygen lance and the liquid surface to 1.5m, and control the oxygen flow rate to 31500m 3 / h and bottom blowing flow rate is 300m 3 / h;

[0039] S2) During the blowing process: add the remaining slagging material and coolant in stages, control the temperature in the TSC period to 1575°C, the slag basicity at the end point is 3.5-4.0, the carbon measured by TSO at the end point is controlled at 0.041%, and the temperature is controlled at 1632°C;

[0040] The addition amount of the coolant is 10-20kg / t, and the addition method is: add in batches: add 30% in the middle period before blowing, add 50% in the middle period of blowing, and add 20% in...

Embodiment 2

[0046] S1) When the lower lance of the converter is turned on, all the lime in the slagging material is added at 35.76kg / t; Add 60% of the total amount at 18kg / t, adjust the distance between the oxygen lance and the liquid surface to 1.4m, and control the oxygen flow rate to 31000m 3 / h and bottom blowing flow rate is 280m 3 / h;

[0047] S2) During the blowing process: add the remaining slagging material and coolant in stages, control the temperature in the TSC period to 1564°C, the slag basicity at the end point is 3.5-4.0, the carbon at the end point TSO is controlled at 0.039%, and the temperature is controlled below 1639°C ;

[0048] The addition amount of the coolant is 10-20kg / t, and the addition method is: add in batches: add 30% in the middle period before blowing, add 50% in the middle period of blowing, and add 20% in the middle and late period of blowing; the coolant includes ore, sinter and return;

[0049] In the remaining slagging material, limestone is added...

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