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Smelting process of carburizing bearing steel

A technology for bearing steel and carburized bearings, applied in the field of metallurgy, can solve the problems of immature nitrogen increasing process, poor castability of molten steel, and high nitrogen content of steel grades, achieve simple and easy smelting process, improve castability, reduce oxidative effect

Inactive Publication Date: 2021-10-22
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) The aluminum content in the steel composition is high, calcium treatment is strictly prohibited, and the castability of molten steel is poor;
[0005] 2) The nitrogen content of this steel is too high, and the nitrogen increasing process is immature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A process for smelting steel for carburized bearings, comprising the following steps:

[0021] (1) Select scrap steel and molten iron hot charging as raw materials, smelt into molten steel in a 100tEBT electric arc furnace, tap when the content of P element in molten steel drops to 0.012%, control the carbon content of tapping to 0.06%, and tapping temperature 1620%, add aluminum shot for deoxidation when tapping;

[0022] (2) The deoxidized molten steel is sent to a 100tLF refining furnace for refining. During refining, silicon carbide deoxidizer is added to the molten steel in 4 batches to carry out diffusion deoxidation on the slag surface. : 0.20%, Al: 0.035%, and then enter the 100tVD furnace for vacuum degassing treatment;

[0023] (3) During the vacuum process, nitrogen gas is blown at the bottom of the ladle for 20 minutes. After vacuum degassing in a 100tVD furnace, aluminum wire is fed according to the target value of aluminum content, and silicon nitride cor...

Embodiment 2

[0026] A process for smelting steel for carburized bearings, comprising the following steps:

[0027] (1) Select scrap steel and molten iron hot charging as raw materials, smelt molten steel in a 100tEBT electric arc furnace, tap when the content of P element in molten steel drops to 0.008%, control the carbon content of tapping to 0.1%, and tapping temperature 1660%, adding aluminum shot for deoxidation when tapping;

[0028] (2) The deoxidized molten steel is sent to a 100tLF refining furnace for refining. During refining, silicon carbide deoxidizer is added to the molten steel in 5 batches to carry out diffusion deoxidation on the slag surface. : 0.23%, Al: 0.040%, and then enter the 100tVD furnace for vacuum degassing treatment;

[0029] (3) During the vacuum process, nitrogen gas is blown at the bottom of the ladle for 30 minutes. After vacuum degassing in a 100tVD furnace, aluminum wire is fed according to the target value of aluminum content, and silicon nitride cored ...

Embodiment 3

[0032] A process for smelting steel for carburized bearings, comprising the following steps:

[0033] (1) Select scrap steel and molten iron hot charging as raw materials, smelt into molten steel in a 100tEBT electric arc furnace, and tap when the content of P element in the molten steel reaches 0.004%, control the carbon content of tapping to 0.15%, and the tapping temperature 1680%, add aluminum shot for deoxidation when tapping;

[0034] (2) The deoxidized molten steel is sent to a 100tLF refining furnace for refining. During refining, silicon carbide deoxidizer is added to the molten steel in 6 batches to carry out diffusion deoxidation on the slag surface. : 0.25%, Al: 0.050%, and then enter the 100tVD furnace for vacuum degassing treatment;

[0035] (3) During the vacuum process, nitrogen gas is blown at the bottom of the ladle for 40 minutes. After vacuum degassing in a 100tVD furnace, aluminum wire is fed according to the target value of aluminum content, and silicon ...

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PUM

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Abstract

The invention discloses a smelting process of carburizing bearing steel. The process comprises the following steps of selecting scrap steel and molten iron as raw materials in a hot charging manner, smelting the raw materials into molten steel in a 100t EBT electric arc furnace, controlling the tapping carbon content to be 0.06%-0.15% and the tapping temperature to be 1620%-1680%, and adding aluminum shots for deoxidation during tapping; conveying the deoxidized molten steel into a 100t LF refining furnace for refining, during refining, adding a silicon carbide deoxidizing agent into the molten steel for slag surface diffusion deoxidation and white slag making, controlling the content of Si in the molten steel to be 0.20%-0.25%, controlling the content of Al in the molten steel to be 0.035%-0.050%, and then enabling the molten steel to enter a 100t VD furnace for vacuum degassing treatment; and blowing nitrogen from the bottom of a steel ladle in the vacuum process, feeding aluminum according to an aluminum content target value after vacuum degassing in the 100t VD furnace, feeding silicon nitride according to a nitrogen analysis result, forbidding calcium treatment in the vacuum process, and adjusting chemical components of the molten steel to a target range after standing. The smelting process is simple and easy to implement, the oxidizing property of the molten steel is effectively reduced, the purity of the molten steel is ensured, the castability of the molten steel is improved, smooth pouring in the continuous casting process is ensured, and smooth production is ensured.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a smelting process of carburized bearing steel. Background technique [0002] Carburized bearing steel is the support of various mechanical parts, and its working environment may be ultra-high temperature, ultra-low temperature, strong vacuum, or strong impact, high wear and ultra-high speed. The structural characteristics and working conditions of carburized bearing steel require bearing parts to have high hardness, wear resistance, contact fatigue strength, good toughness, dimensional stability, corrosion resistance and cold and hot processing performance. [0003] The rings and rolling elements made of carburized bearing steel are generally suitable for the working temperature of -40 ~ 140 ℃, and can be used under the conditions of relatively large shock and vibration. They are widely used in rolling stock and rolling mills. Bearings etc. Therefore, compared t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/10C21C7/00C21C5/52C22C33/04C22C38/02C22C38/04C22C38/06C22C38/22C22C38/20C22C38/28C22C38/44C22C38/42C22C38/50
CPCC21C7/06C21C7/0056C21C7/10C21C7/0087C21C5/52C22C33/04C22C38/02C22C38/04C22C38/06C22C38/22C22C38/20C22C38/28C22C38/44C22C38/42C22C38/50Y02P10/20
Inventor 赵张发
Owner NANJING IRON & STEEL CO LTD
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