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Converter tapping metallurgy process for reducing large-size inclusions in bearing steel

A technology for bearing steel and inclusions, which is applied in the field of iron and steel metallurgy production, can solve the problems of unstable control of large-sized inclusions, and achieve the effects of reducing nozzle nodulation, strong process stability, and reducing operations

Active Publication Date: 2022-01-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of unstable control of large-size inclusions in bearing steel at present, the present invention proposes a converter tapping metallurgical process for reducing large-size inclusions in bearing steel

Method used

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  • Converter tapping metallurgy process for reducing large-size inclusions in bearing steel
  • Converter tapping metallurgy process for reducing large-size inclusions in bearing steel
  • Converter tapping metallurgy process for reducing large-size inclusions in bearing steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Molten steel preparation for converter smelting: put 118t of pretreated molten iron and 32t of scrap cold material into the converter for blowing, add lime, dolomite and other slagging agents to complete the tasks of dephosphorization, decarburization, and temperature rise, and the converter blowing is completed The molten steel composition is: ω[C] 0.14%, ω[Si] 0.001%, ω[Mn] 0.092%, ω[P] 0.012%, ω[S] 0.017%, ω[Cr] 0.032%, tapping The temperature is 1600°C. , Carry out slag blocking operation before tapping.

[0052] (2) Ladle preparation: the basicity of the binary slag smelted in the first two furnaces of the used ladle is 5-9, there is no obvious residue after the ladle is cleaned, and the temperature of the ladle is 1100°C.

[0053] (3) Alloy and slag addition method in the tapping process: when the tapping amount reaches 1 / 5 of the total tapping amount, add 360kg of aluminum-iron alloy for deoxidation, and add 300kg of ferrosilicon and low-carbon manganese whe...

Embodiment 2

[0057] (1) Preparation of molten steel for converter smelting: put 130t of pretreated molten iron and 15t of scrap cold material into the converter for blowing, add lime, dolomite and other slagging agents to complete the tasks of dephosphorization, decarburization, and temperature rise, and the converter blowing is completed The molten steel composition is: ω[C] 0.15%, ω[Si] 0.001%, ω[Mn] 0.089%, ω[P] 0.010%, ω[S] 0.015%, ω[Cr] 0.033%, tapping The temperature is 1645°C. , Carry out slag blocking operation before tapping.

[0058] (2) Ladle preparation: The basicity of the binary slag smelted in the first two furnaces of the used ladle is 4.6-8.5, there is no obvious residue after the ladle is cleaned, and the temperature of the ladle is 1090°C.

[0059] (3) Alloy and slag addition method in the tapping process: when the tapping amount reaches 1 / 5 of the total tapping amount, add 400kg of aluminum-iron alloy for deoxidation, and add 296kg of ferrosilicon and low-carbon mangan...

Embodiment 3

[0063] (1) Molten steel preparation for converter smelting: put 125t of pretreated molten iron and 18t of scrap cold material into the converter for blowing, add lime, dolomite and other slagging agents to complete the tasks of dephosphorization, decarburization, and temperature rise, and the converter blowing is completed The molten steel composition is: ω[C] 0.20%, ω[Si] 0.003%, ω[Mn] 0.098%, ω[P] 0.013%, ω[S] 0.021%, ω[Cr] 0.051%, tapping The temperature is 1615°C. , Carry out slag blocking operation before tapping.

[0064] (2) Ladle preparation: the basicity of the binary slag smelted in the first two furnaces of the used ladle is 5-8.7, there is no obvious residue after the ladle is cleaned, and the temperature of the ladle is 1100°C.

[0065] (3) Alloy and slag addition method in the tapping process: when the tapping amount reaches 1 / 5 of the total tapping amount, add 380kg of aluminum-iron alloy for deoxidation, and add 322kg of ferrosilicon and low-carbon manganese w...

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Abstract

The invention discloses a converter tapping metallurgy process for reducing large-size inclusions in bearing steel. The converter tapping metallurgy process specifically comprises the following steps of: firstly, when molten steel preparation is performed in converter smelting, the carbon content and the temperature of the molten steel at a converter terminal are controlled; a steel ladle is cleaned, and is preheated to a certain temperature; secondly, aluminum alloys, other alloys and composite slag are respectively added in a preset time period in the tapping process in a certain mode, and the bottom blowing stirring and the molten steel falling point are controlled; and after the tapping is finished, the bottom blowing stirring is continuously performed to facilitate the steel slag melting, the temperature uniformity and the inclusion floating so as to realize the converter tapping metallurgy process for reducing the large-size inclusions in the bearing steel. The converter tapping metallurgy process has the following beneficial effects: as the technical scheme is adopted, the number of the large-size inclusions in the molten steel treated by the process is reduced below 50% of the original number in the subsequent smelting process, the total area is reduced within 20% of the original area, and the size and the number of the large-size inclusions in the bearing steel are preferably controlled finally.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgical production, in particular to a converter tapping metallurgical process for reducing large-size inclusions in bearing steel. The invention is particularly suitable for the smelting process of high-purity bearing steel with strict requirements on large-size inclusions. Background technique [0002] As an important metallurgical product, bearing steel is specially used to manufacture bearing rings and rolling elements, and is widely used in machinery manufacturing, railway transportation, national defense industry and other fields. With the development of modern industry, the use environment of bearings is becoming increasingly harsh. Higher and stricter requirements are put forward for the fatigue life of the bearing. Inclusions are the key factors affecting the fatigue life of bearing steel. In recent years, with the continuous improvement of metallurgical technology, the content of ty...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/00C21C7/06C21C7/072C21C7/076C22C33/06
CPCC21C5/28C21C7/06C21C7/0006C21C7/076C21C7/0068C21C7/072C21C7/0087C22C33/06C21C2007/0093Y02P10/20
Inventor 成国光苗志奇李世健黄宇
Owner UNIV OF SCI & TECH BEIJING
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