Method for increasing continuous casting heats of aluminum-deoxidized bearing steel

An aluminum deoxidation bearing and continuous casting technology, which is applied in the field of smelting, can solve the problems of limited inclusion effect, easy solidification, and inability to solve the production problems of bearing steel continuous casting, so as to reduce the labor intensity of workers, improve the cleanliness of steel, and reduce the number of times of use. increased effect

Inactive Publication Date: 2013-01-02
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its disadvantage is that the top slag floats on the surface of the molten steel and is easy to solidify, and it is difficult to fully react between the molten steel and the steel slag, and the actual removal of Al 2 o 3 The effect of inclusions is limited, and it cannot solve the problem of continuous casting of bearing steel

Method used

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  • Method for increasing continuous casting heats of aluminum-deoxidized bearing steel

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Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1 (the first furnace of continuous casting and pouring):

[0023] 1) Desulfurization of molten iron. The temperature of molten iron entering the molten iron tank of the blast furnace is 1320°C. After desulfurization of the molten iron, the weight percentages of the following components in the molten iron are controlled as follows: S: 0.005%, P: 0.15%, Si: 0.30%;

[0024] 2) Converter smelting, control the temperature of desulfurized molten iron entering the converter at 1250°C, control the basicity R of the oxide slag: 3.5, and control the content of C at the end of the converter to 0.08% by weight;

[0025] 3) The converter is tapped and alloyed, and the thickness of the amount of slag flowing into the ladle from the converter is controlled to be 80mm; when the steel is tapped to 1 / 4 of the total amount of molten steel, aluminum is added at a time at 0.50Kg / ton of steel;

[0026] 4) Argon blowing and stirring at the argon station, after 3 minutes of blowing ...

Embodiment 2

[0032] Embodiment 2 (the 2nd furnace of continuous casting and pouring):

[0033] 1) Desulfurization of molten iron, the temperature of molten iron entering the molten iron tank of the blast furnace is 1325°C, after desulfurization of the molten iron, the weight percentage content of the following components in the molten iron is controlled as follows: S: 0.008%, P: 0.10%, Si: 0.10%;

[0034] 2) Converter smelting, control the temperature of desulfurized molten iron entering the converter at 1260°C, control the basicity R of the oxide slag: 3.0, and control the content of C at the end of the converter to 0.15% by weight;

[0035] 3) The converter is tapped and alloyed, and the thickness of the amount of slag flowing into the ladle from the converter is controlled to be 50mm; when the steel is tapped to 1 / 4 of the total amount of molten steel, aluminum is added at a time according to 0.70Kg / ton of steel;

[0036] 4) Argon blowing and stirring at the argon station, after 3 minut...

Embodiment 3

[0042] Embodiment 3 (the 3rd furnace of continuous casting and pouring):

[0043] 1) Desulfurization of molten iron, the temperature of molten iron entering the molten iron tank of the blast furnace is 1330°C, after desulfurization of the molten iron, the weight percentage content of the following components in the molten iron is controlled as follows: S: 0.008%, P: 0.12%, Si: 1.0%;

[0044] 2) Converter smelting, control the temperature of desulfurized molten iron entering the converter at 1290°C, control the basicity R of the oxide slag: 3.8, and control the content of C at the end of the converter to 0.3% by weight;

[0045] 3) The converter is tapped and alloyed, and the thickness of the amount of slag flowing into the ladle from the converter is controlled to be 150mm; when the steel is tapped to 1 / 4 of the total amount of molten steel, aluminum is added at a time according to 0.80Kg / ton of steel;

[0046] 4) Argon blowing and stirring at the argon station, after 6 minutes ...

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Abstract

A method for increasing continuous casting heats of aluminum-deoxidized bearing steel includes the steps of desulphurizing molten iron; smelting with a converter; allowing the converter to tap and alloying; performing argon stirring in an argon station; refining; vacuum-treating; feeding silicon calcium wire; performing protective casting and continuously casting to obtain blanks. The method has the advantages that original two continuous casting heats of the bearing steel is increased to more than five heats, and production efficiency is greatly improved; the number of using a ladle is increased, consumables consumption is reduced, and labor intensity of workers is reduced; low level of oxygen content and nonmetal impurities can be stably controlled, and steel cleanness is high.

Description

technical field [0001] The invention relates to a smelting method, in particular to a method for increasing the number of continuous casting furnaces for bearing steel. Background technique [0002] The bearing is a mechanical transmission part. When the bearing is working, the inner and outer rings of the bearing and the rolling elements of the bearing are subjected to high-frequency alternating stress, and the working conditions are very harsh. Under the action of complex alternating stress, fatigue cracks will first appear on the parts with low fatigue strength on the surface of the ring or rolling element, and finally fatigue spalling will form, causing the bearing to fail. [0003] After long-term research, it has been found that the oxygen content significantly affects the fatigue life of bearing steel. The Swedish SKF company has done a lot of experimental research on the relationship between the oxygen content of bearing steel and the fatigue life, and has come to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/06C21C7/072C21C7/076C21C7/10C21C1/02C21C5/28B22D11/00
CPCY02P10/20
Inventor 范植金罗国华朱玉秀
Owner 武汉钢铁有限公司
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