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A kind of refining process of high-purity gcr15simn bearing steel

A technology of purity and bearing steel, applied in the direction of improving process efficiency, etc., can solve the problems of secondary pollution of molten steel, high price of low-titanium ferroalloy, increase of production cost, etc., meet the requirements of reducing Ti content and reduce the generation of inclusions , cost-saving effect

Active Publication Date: 2022-07-22
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the addition of Al can deoxidize and reduce Si and Mn large particle inclusions, it will also cause TiO in the slag during the refining process. 2 At the same time, it causes the reduction of Ca in the slag, and then forms calcium aluminate inclusions, which is not conducive to the smelting of low-titanium and high-cleanness bearing steel; Low-titanium alloys, however, low-titanium ferroalloys are expensive. If low-titanium alloys are completely used, the production cost will increase and the market competitiveness will be reduced. In addition, in order to control the Ti content in the LF refining process, some scholars propose to use high alkalinity in the early stage of LF refining. The slag is deoxidized by Al, and Ti is controlled by adding silica to produce low-basic slag at the end of refining, but adding silica in the late stage of LF will cause secondary pollution to molten steel

Method used

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  • A kind of refining process of high-purity gcr15simn bearing steel
  • A kind of refining process of high-purity gcr15simn bearing steel
  • A kind of refining process of high-purity gcr15simn bearing steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] The "EAF + slag removal + LF + RH + die casting" production process can be used to smelt low oxygen, low titanium, less inclusion GCr15SiMn bearing steel.

[0069] (1) EAF primary smelting: At the end of smelting, the temperature is 1658 ° C, the composition of molten steel is: [C] 0.19%, [Si] 0.01%, [Mn] 0.21%, [Al] 0.003%, the tapping amount is 129.5t ;

[0070] During the tapping process, add 6.5kg / ton of steel Si-Fe alloy (Ti content is 0.05%), and add Cr-Fe and other alloys according to the composition design requirements of the steel grade; then add 1.6kg / ton of steel lime, 0.4kg / ton of steel CaF 2 ; Do not add Al at this time to avoid adding TiO in the slag 2 restoration.

[0071] (2) Slag removal operation: After tapping, the ladle containing molten steel is sent to the slag removal station, and the slag above the ladle is removed by a slag remover, and the removal amount is about 95%.

[0072] (3) LF refining: the ladle is in place, and 8.5kg / ton of steel...

Embodiment 2

[0077] The same production process of "EAF + slag removal + LF + RH + die casting" is used to produce GCr15SiMn bearing steel.

[0078] (1) EAF primary smelting: At the end of smelting, the temperature is 1650 ° C, the molten steel composition is: [C] 0.16%, [Si] 0.01%, [Mn] 0.15%, [Al] 0.002%, and the tapping amount is 130t;

[0079] During the tapping process, add 6.5kg / ton of steel Si-Fe alloy, and add Cr-Fe and other alloys according to the composition design requirements of the steel grade; then add 1.5kg / ton of steel lime and 0.5kg / ton of steel CaF 2 .

[0080] (2) Slag removal operation: The operation is basically the same as that of Example 1, and the slag removal amount is about 92%.

[0081] (3) LF refining: the ladle is in place, and 8.8kg / ton of steel manganese and 9kg / ton of steel synthetic slag refining agent are sequentially added to the molten steel. After 25 minutes of refining, temperature measurement, sampling, and sample delivery, the steel sample composi...

Embodiment 3

[0086] The same production process of "EAF + slag removal + LF + RH + die casting" is used to produce GCr15SiMn bearing steel.

[0087] (1) EAF primary smelting: At the end of smelting, the temperature is 1658°C, and the molten steel composition is: [C] 0.22%, [Si] 0.02%, [Mn] 0.20%, [Al] 0.003%, and the tapping amount is 130t;

[0088] During the tapping process, 6.4kg / ton of steel Si-Fe alloy and other alloys are added; then 1.6kg / ton of steel lime and 0.4kg / ton of steel CaF are added 2 .

[0089] (2) Slag removal operation: The operation is basically the same as that of Example 1.

[0090](3) LF refining: the ladle is in place, and 8.5kg / ton of steel manganese and 9.5kg / ton of steel synthetic slag refining agent are sequentially added to the molten steel. After 22 minutes of refining, temperature measurement, sampling, and sample delivery, the steel sample composition detected after 10 minutes: [C] 0.88%, [Si] 0.57%, [Mn] 1.05%. After adding 0.2kg / ton of steel Al, and fi...

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Abstract

The invention discloses a refining process for GCr15SiMn bearing steel, which adopts the process route of "EAF+slag removal+LF+RH+die casting", and the specific contents are as follows: Si-Fe alloy and slag removal agent are added during the EAF tapping ‑Fe alloy and LF synthetic slag refining agent are added to the LF station after ladle slag removal; Al addition is optimized between different processes, that is, no Al is added during the EAF tapping process, and the Al content is controlled to be ≤0.003%; less in the LF process Add Al to control its content to be 0.005% to 0.008%; add Al during RH degassing to control its content to 0.015% to 0.025%; after RH degassing, the molten steel is sedated for 8 to 12 minutes. The content of O and Ti in the GCr15SiMn bearing steel produced by the invention can be controlled within 6 ppm and 15 ppm respectively, and the inclusions are small, and the DS type inclusions are less than or equal to 0.5.

Description

technical field [0001] The invention belongs to the technical field of production of high-quality high-carbon chromium bearing steel, and particularly relates to a refining process of low-oxygen, low-titanium and less inclusion GCr15SiMn bearing steel. Background technique [0002] GCr15SiMn belongs to high-carbon chromium bearing steel, and its main components are: 0.95-1.05% C, 1.4-1.65% Cr, 0.45-0.75% Si, 0.95-1.25% Mn, it is based on GCr15 bearing steel, by increasing Si , Mn alloy elements, so that the steel has better hardenability, wear resistance and elastic limit, is widely used in wind power, heavy machinery, mining machinery and other fields. In recent years, with the development of modern science and technology, higher and stricter requirements have been put forward for the quality of bearing steel. At the same time, high-purity bearing steel is one of the important tasks pursued by metallurgical workers. The cleanliness of bearing steel is one of the most impor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21C7/00C21C7/06C21C7/076C21C7/10
CPCC22C33/06C21C7/0006C21C7/06C21C7/10C21C7/076C21C7/0087Y02P10/20
Inventor 成国光张国磊王云鹏王启明李尧
Owner UNIV OF SCI & TECH BEIJING