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A method for smelting control of nitrogen content in fin steel

A control method and technology of nitrogen content, applied in the direction of improving process efficiency, etc., can solve the problems of less than 60% pass rate, exceeding the control range, and large fluctuation of nitrogen content, so as to achieve stable nitrogen content and ensure the effect of diffusion time

Active Publication Date: 2018-06-26
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the nitrogen content in fin steel is mostly controlled by the nitrogen control method in the later stage of the vacuum process. Because the solubility of nitrogen in molten steel in a vacuum environment is affected by various factors such as vacuum degree, alloy type and content, temperature, etc., resulting in Nitrogen content fluctuates greatly, beyond the control range, so the qualified rate is less than 60%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for smelting and controlling nitrogen content in fin steel, the steps of which are:

[0023] 1) Converter smelting, and control the basicity of slag at 2.5, the end point temperature of molten steel at 1675°C, and P at 0.0093wt%;

[0024] 2) Tapping, at the same time as tapping, add slaked lime at a time according to 1.2Kg / ton of molten steel, and control the slag thickness at 48mm;

[0025] When tapping reaches 1 / 3, add carbon powder to deoxidize according to 0.25Kg / ton of molten steel, and the oxygen content is 405PPm; take the operation of retaining steel, and the amount of steel remaining is 11 Kg / ton of molten steel;

[0026] 3) Refining in LF furnace after tapping, the oxygen content is controlled to 410PPm after refining;

[0027] 4) Submerged arc slag heating in the ladle: add calcium carbide at 0.41Kg / ton of molten steel before submerged arc slag heating; and control the off-site temperature at 1645°C, and control the oxygen content at 452PPm; 3 minut...

Embodiment 2

[0032] A method for smelting and controlling nitrogen content in fin steel, the steps of which are:

[0033] 1) Converter smelting, and control the basicity of slag at 2.52, the end point temperature of molten steel at 1678°C, and P at 0.0087wt%;

[0034] 2) Tapping, at the same time as tapping, add slaked lime at a time according to 1.3 Kg / ton of molten steel, and control the slag thickness at 40mm;

[0035] When the steel is tapped to 1 / 3, add carbon powder for deoxidation according to 0.55Kg / ton of molten steel, and the oxygen content is 405PPm; take the operation of retaining steel, and the amount of steel remaining is 12 Kg / ton of molten steel;

[0036] 3) Refining in LF furnace after tapping, the oxygen content is controlled to 420PPm after refining;

[0037] 4) Submerged arc slag heating in the ladle: Add calcium carbide at 0.44Kg / ton of molten steel before submerged arc slag heating; and control the off-site temperature at 1647°C, and control the oxygen content at 454...

Embodiment 3

[0043] A method for smelting and controlling nitrogen content in fin steel, the steps of which are:

[0044] 1) Converter smelting, and control the basicity of slag at 2.53, the end point temperature of molten steel at 1681°C, and P at 0.0072wt%;

[0045] 2) Tapping, at the same time as tapping, add slaked lime at a time according to 1.6 Kg / ton of molten steel, and control the slag thickness at 43mm;

[0046] When the steel is tapped to 1 / 3, add carbon powder for deoxidation according to 0.5 Kg / ton of molten steel, and the oxygen content is 491PPm; take the operation of retaining steel, and the amount of steel remaining is 13 Kg / ton of molten steel;

[0047] 3) Refining in LF furnace after tapping, the oxygen content is controlled to 422PPm after refining;

[0048] 4) Submerged arc slag heating in the ladle: add calcium carbide at 0.47Kg / ton of molten steel before submerged arc slag heating; and control the off-site temperature at 1651°C, and control the oxygen content at 453...

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Abstract

The invention discloses a smelting control method of a nitrogen content in fin steel. The method comprises converter smelting, tapping, LF furnace refining, submerged arc slagging heating in a steel ladle, RH vacuum treatment and conventional subsequent procedures. The method can precisely control the nitrogen content in the fin steel, stably controls the nitrogen content within 30-70 ppm, and reaches the pass percent of above 95%.

Description

technical field [0001] The invention relates to a smelting method for controlling impurity elements in steel, in particular to a smelting control method for nitrogen content in fin steel. Background technique [0002] Fin steel is the raw material for fin heat exchangers. As a kind of heat exchange device, the finned heat exchanger is named after its heat exchange unit looks like a fin. It is mainly used for air heating in the drying system and is the main equipment in the hot air device. The heat medium can be steam or hot water, and heat transfer oil can also be used. Because of the mechanical winding, the contact surface between the heat dissipation fin and the heat dissipation pipe is large and tight, the heat transfer performance is good and stable, the air passage is small, and the heat exchange efficiency is high. Due to the demand for energy saving and environmental protection, the output of fin steel has grown steadily in China in recent years. [0003] Due to its...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/076C21C7/10
CPCC21C7/076C21C7/10Y02P10/20
Inventor 吴维轩刘凯金奎徐培春胡俊辉王成邱晨叶飞张俊志
Owner 武汉钢铁有限公司
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