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Smelting method of ultra-low carbon steel

A smelting method, ultra-low carbon steel technology, applied in the field of iron and steel smelting, can solve the problems of high smelting cost, large equipment damage, complex smelting method, etc., to improve the life of the oxygen lance, reduce the temperature rise of oxygen blowing and aluminum, and reduce the temperature of the oxygen lance The effect of frequency of use

Active Publication Date: 2019-06-21
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of complex smelting methods for ultra-low carbon steel, high smelting costs, and great damage to equipment, the present invention provides a smelting method for ultra-low carbon steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for smelting ultra-low carbon steel, comprising the following process steps:

[0024] Step a, desulfurize the molten iron, the sulfur content in the molten iron after desulfurization is ≤0.003%; after the desulfurization treatment, carry out converter smelting, the converter smelting process uses slag blocking marks and slide plates to prevent slag from returning to phosphorus, and the whole process of the converter is Argon blowing, bottom blowing argon flow control at 300Nm 3 / h, the mass content of C in the converter tapping water is 0.03%, and the O content is controlled at 700ppm; the end point temperature of the converter is 1630°C; The mass content of C in molten steel of the steel is 0.03%, and the O content is 700 ppm.

[0025] Step b. The molten steel tapped from the converter enters the argon blowing station for argon blowing and stirring for 3 minutes. The flow rate of the argon blowing is 30NL / min. Compensation to 0.35%, temperature compensation ...

Embodiment 2

[0029] A method for smelting ultra-low carbon steel, comprising the following process steps:

[0030] Step a, desulfurize the molten iron, the sulfur content in the molten iron after desulfurization is ≤0.003%; after the desulfurization treatment, carry out converter smelting, the converter smelting process uses slag blocking marks and slide plates to prevent slag from returning to phosphorus, and the whole process of the converter is Argon blowing, bottom blowing argon flow control at 350Nm 3 / h, the mass content of C in the converter tapping water is 0.035%, and the O content is 800ppm; the end point temperature of the converter is 1640°C; The mass content of C in the molten steel is 0.04%, and the O content is 800ppm.

[0031] Step b. The molten steel tapped from the converter enters the argon blowing station for argon blowing and stirring for 5 minutes. The flow rate of the argon blowing is 60NL / min. Compensation to 0.40%, temperature compensation to 1670°C, adding 180kg...

Embodiment 3

[0035] A method for smelting ultra-low carbon steel, comprising the following process steps:

[0036] Step a, desulfurize the molten iron, the sulfur content in the molten iron after desulfurization is ≤0.003%; after the desulfurization treatment, carry out converter smelting, the converter smelting process uses slag blocking marks and slide plates to prevent slag from returning to phosphorus, and the whole process of the converter is Argon blowing, bottom blowing argon flow control at 400Nm 3 / h, the mass content of C in the converter tapping water is within 0.04%, and the O content is 900ppm; the end point temperature of the converter is 1650°C; the height of the remaining space of the ladle after the converter tapping is 500mm; The mass content of C in molten steel of the steel is 0.04%, and the O content is 900 ppm.

[0037] Step b. The molten steel tapped from the converter enters the argon blowing station for argon blowing and stirring for 6 minutes. The flow rate of th...

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Abstract

The invention relates to the technical field of iron and steel smelting, and particularly discloses a smelting method of ultra-low carbon steel. The smelting method comprises the following process steps that a, desulfurization pretreatment is carried out on molten iron, and then converter smelting is carried out; b, argon blowing stirring is carried out on molten steel tapped from a converter, andLF refining is carried out after argon blowing stirring is finished; and c, the molten steel refined by an LF enters an RH furnace to be refined. According to the method, the LF-RH duplex process isadopted, so that the smelting time of the ultra-low carbon steel is shortened, the tapping temperature of the converter is effectively reduced, the erosion of a furnace lining can be reduced, the operation of an RH oxygen lance can be reduced, the service frequency of the oxygen lance can be reduced, the service life of the oxygen lance can be prolonged, and the production cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for smelting ultra-low carbon steel. Background technique [0002] In the process of ultra-low carbon steel smelting, it is difficult to control the molten steel C < 0.030% after tapping from the converter, and it usually exceeds 0.03%. In order to ensure production efficiency and complete decarburization within the expected time, RH furnace forced decarburization technology must be used , the key to the forced decarburization technology lies in the control of the timing and amount of oxygen blowing. Studies have shown that early oxygen blowing not only easily damages the refractory material at the bottom of the connecting pipe, but also delays the reduction of the pressure in the vacuum chamber, resulting in a slower decarburization speed. ; and delayed oxygen blowing not only cannot discharge CO in time, but also cannot carry out the decarburization ...

Claims

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Application Information

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IPC IPC(8): C21C1/02C21C7/00C21C7/06C21C7/064C21C7/068C21C7/072C21C7/10
Inventor 佟玉伟方鸣宋慧强李玮韩德文贾增立
Owner HEBEI IRON AND STEEL
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