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Production method of high cleanliness bearing steel

A production method and high cleanliness technology, applied in the field of iron and steel metallurgy

Active Publication Date: 2022-04-15
UNIV OF SCI & TECH BEIJING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the service life and performance stability of existing bearing steel need to be further improved, the present invention provides a production method of high-cleanliness bearing steel

Method used

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Experimental program
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Effect test

Embodiment 1

[0053] The embodiment of the present invention provides a production method of high cleanliness bearing steel, the steps are as follows:

[0054] (1) BOF blowing: Add 90t of molten iron (temperature 1240°C) and 10t of steel scrap into a 100t top-bottom re-blowing converter, then shake the converter upright, lower the top lance of the converter to 1.8m from the liquid surface of the molten pool, and set the top lance to For oxygen blowing mode, according to the oxygen supply intensity 3.0NM 3 Oxygen is blown into the molten pool of the converter at / t min, and nitrogen is blown in through the breathable brick at the bottom of the converter at the same time, the flow rate of nitrogen is 25L / min; The content is monitored and the rate of change of CO content is calculated:

[0055] R=(W t1+5 -W t1 ) / 5, where W t1 is the CO content in the flue gas detected at time t1, W t1+5 is the CO content in the flue gas detected after an interval of 5s from t1;

[0056] After testing, wh...

Embodiment 2

[0067] The embodiment of the present invention provides a production method of high cleanliness bearing steel, the steps are as follows:

[0068] (1) BOF blowing: Add 180t of molten iron (temperature 1300°C) and 25t of steel scrap into a 200t top-bottom combined blowing converter, then shake the converter upright, lower the converter top lance to 2.0m from the liquid surface of the molten pool, and set the top lance to For oxygen blowing mode, according to the oxygen supply intensity 4.5NM 3 Oxygen is blown into the converter molten pool at / t min, and nitrogen is blown in through the breathable brick at the bottom of the converter at the same time. The nitrogen flow rate is 50L / min; The content is monitored and the rate of change of CO content is calculated:

[0069] R=(W t1+5 -W t1 ) / 5, where W t1 is the CO content in the flue gas detected at time t1, W t1+5 is the CO content in the flue gas detected after an interval of 5s from t1;

[0070] After testing, when the blo...

Embodiment 3

[0081] The embodiment of the present invention provides a production method of high cleanliness bearing steel, the steps are as follows:

[0082] (1) BOF blowing: Add 145t of molten iron (temperature 1360°C) and 16t of scrap steel into a 150t top-bottom re-blowing converter, then shake the converter upright, lower the top gun of the converter to 1.6m from the liquid surface of the molten pool, and set the top gun to For oxygen blowing mode, according to the oxygen supply intensity 2.7NM 3 Oxygen is blown into the molten pool of the converter at / t min, and nitrogen is blown in through the breathable brick at the bottom of the converter at the same time. The nitrogen flow rate is 100L / min; The content is monitored and the rate of change of CO content is calculated:

[0083] R=(W t1+5 -W t1 ) / 5, where W t1 is the CO content in the flue gas detected at time t1, W t1+5 is the CO content in the flue gas detected after an interval of 5s from t1;

[0084] After testing, when th...

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Abstract

The invention relates to the technical field of iron and steel metallurgy, and specifically discloses a production method of high-cleanness bearing steel. The invention adopts a brand-new process of top-bottom combined hydrogen blowing in the later stage of the converter + full hydrogen deoxidation + silicon carbide LF refining weak deoxidation + Ce inclusion denaturation treatment + vacuum deep hydrogen deoxidation + vertical continuous casting machine pouring, and accurately controls each process condition , so that the O content of the molten steel is lower than 5ppm, and the H content is lower than 2ppm, and the hydrogen is blown into the converter blowing later stage, which greatly reduces the initial O content in the molten steel, and the hydrogen deoxidation process is adopted in the whole process, and the deoxidation product is only H 2 O, does not pollute molten steel, and simplifies the deoxidation alloying process, effectively reduces the amount of deoxidation alloy used, reduces production costs, is a low-cost clean bearing steel production process, and has good promotion and application value.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a production method of high-cleanness bearing steel. Background technique [0002] Bearing steel is widely used as bearing rolling body and ring material due to its good fatigue resistance, wear resistance and cold and hot processing performance. With the development of modern science and technology, higher and stricter requirements are put forward for the quality of bearings. It is an important task for metallurgists to continuously improve the quality of bearing steel. GCrl5 bearing steel was invented at the end of the 19th century. It is a high-carbon chromium bearing steel with less alloy content, good performance and the most widely used. For more than 100 years, the chemical composition of GCrl5 has remained basically unchanged, and the continuous improvement of its performance mainly depends on the continuous improvement of smelting methods and preparati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21C5/35C21C7/06C21C7/00C21C7/072C21C7/10B22D11/041C22C38/02C22C38/04C22C38/18
CPCC22C33/06C21C5/35C21C7/06C21C7/0006C21C7/072C21C7/10B22D11/041B22D11/001C22C38/02C22C38/04C22C38/18C22C38/005
Inventor 曹磊朱立光郭志红
Owner UNIV OF SCI & TECH BEIJING
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