Bearing steel tapping alloying control method, bearing steel and preparation method thereof

A control method and bearing steel technology, which is applied in the field of iron and steel smelting, can solve problems such as unsatisfactory alloying and slag washing effects, unsintered alloy and slag materials, and large additions of steel alloy and slag washing materials.

Inactive Publication Date: 2020-09-08
SGIS SONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the current conventional practices exist: incomplete deoxidation, large addition of tapping alloy and slag washing materials, unsatisfactory alloying and slag washing effects, or unmelted agglomeration of some alloys and slag materials often appear on the molten steel surface; These problems affect the LF furnace (ladle refining furnace) arrival component hit rate and early rapid slagging

Method used

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  • Bearing steel tapping alloying control method, bearing steel and preparation method thereof
  • Bearing steel tapping alloying control method, bearing steel and preparation method thereof
  • Bearing steel tapping alloying control method, bearing steel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] A method for preparing bearing steel is provided, comprising:

[0097] In terms of mass fraction, the above-mentioned components of the bearing steel include: C 0.9%, Si 0.1%, Mn 0.2%, Cr 1.35%.

[0098] The aluminum-iron alloy is placed in the first intermediate silo; the first vibration feed switch is set for the first intermediate silo. Alloys containing silicon, manganese, chromium and carbon are placed in the second intermediate feed bin; a second vibration feeding switch is set for the second intermediate feed bin. The lime in the slag washing material is placed in the high-level silo of auxiliary raw materials, and the conditioner is placed in the third middle silo. The high-level silo and the third middle-level silo for auxiliary raw materials both use flap valve discharge switches.

[0099] When the tapping amount is 20t, turn on the first vibration feeding switch to vibrate the aluminum-iron alloy into the ladle, and the vibration feeding time is 10s.

[0100...

Embodiment 2

[0105] A method for preparing bearing steel is provided, comprising:

[0106] In terms of mass fraction, the above-mentioned components of the bearing steel include: C 1.0%, Si 0.2%, Mn 0.3%, Cr 1.45%.

[0107] The aluminum-iron alloy is placed in the first intermediate silo; the first vibration feed switch is set for the first intermediate silo. Alloys containing silicon, manganese, chromium and carbon are placed in the second intermediate feed bin; a second vibration feeding switch is set for the second intermediate feed bin. The lime in the slag washing material is placed in the high-level silo of auxiliary raw materials, and the conditioner is placed in the third middle silo. The high-level silo and the third middle-level silo for auxiliary raw materials both use flap valve discharge switches.

[0108] When the tapping amount is 30t, turn on the first vibration feeding switch to vibrate the aluminum-iron alloy into the ladle, and the vibration feeding time is 15s.

[01...

Embodiment 3

[0114] A method for preparing bearing steel is provided, comprising:

[0115] In terms of mass fraction, the above-mentioned components of the bearing steel include: C 0.98%, Si 0.15%, Mn 0.25%, Cr 1.40%.

[0116] The aluminum-iron alloy is placed in the first intermediate silo; the first vibration feed switch is set for the first intermediate silo. Alloys containing silicon, manganese, chromium and carbon are placed in the second intermediate feed bin; a second vibration feeding switch is set for the second intermediate feed bin. The lime in the slag washing material is placed in the high-level silo of auxiliary raw materials, and the conditioner is placed in the third middle silo. The high-level silo and the third middle-level silo for auxiliary raw materials both use flap valve discharge switches.

[0117] When the tapping amount is 25t, turn on the first vibration feeding switch to vibrate the aluminum-iron alloy into the ladle, and the vibration feeding time is 14s.

...

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Abstract

The invention relates to the field of steel smelting, in particular to a bearing steel tapping alloying control method, bearing steel and a preparation method thereof. The control method comprises thefollowing steps of when the tapping amount is 20-30 t, adding an aluminum-iron alloy in a vibration feeding manner for 10-15 seconds; after 15-30 seconds, adding an alloy containing silicon, manganese, chromium and carbon in a vibration feeding mode for 45-65 seconds; and when the tapping amount is 80-100 t, adding a slag washing material. According to the method, firstly, a ferro-aluminum alloyis added into a steel ladle in a vibrating mode to guarantee thorough deoxidation, impurities in molten steel are promoted to float upwards, impurities in the molten steel are reduced, and then the alloy containing silicon, manganese, chromium and carbon is added to avoid caking. The method solves the problem of caking caused by the fact that a large number of alloys with different melting pointsare intensively and rapidly added and cannot be rapidly melted in time, meanwhile, the hit rate of refining arrival components is increased, and the slagging time of refining white slag is shortened.

Description

technical field [0001] The present application relates to iron and steel smelting, in particular, to a method for controlling the tapping and alloying of bearing steel, bearing steel and a preparation method thereof. Background technique [0002] Bearing steel is the type of steel used to manufacture balls, rollers, and bearing rings. Bearing steel requires high hardness, wear resistance and elastic limit. Therefore, for the smelting of bearing steel, the process requirements are high. [0003] Bearing steel is usually smelted in a converter. In order to improve the performance of bearing steel, it is necessary to reduce the oxygen content in molten steel during the smelting process, improve the purity of molten steel, and ensure that the final phosphorus is qualified. [0004] In the process of smelting bearing steel by converter, the bearing steel slag washing and alloying process has a great influence on the performance of bearing steel. Slag washing refers to the meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/00C22C33/04C22C38/02C22C38/04C22C38/18
CPCC21C7/06C21C7/0006C22C33/04C22C38/02C22C38/04C22C38/18
Inventor 赵科曾令宇刘志明邓长付覃小峰何智荣余大华龙鹄张峰王冠刘志龙谭奇峰刘平
Owner SGIS SONGSHAN CO LTD
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