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Medium carbon bearing steel and its preparation method

A bearing steel and steel technology, applied in the field of metallurgy, can solve the problems of high manufacturing cost of high-strength and tough rolling bearings, and achieve the effects of improving wear resistance, high comprehensive performance, and high impact toughness

Inactive Publication Date: 2008-05-28
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The invention aims at the deficiencies of the prior art, and mainly solves the problem of high manufacturing cost of high-strength and toughness rolling bearings under heavy load and high-impact working conditions

Method used

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  • Medium carbon bearing steel and its preparation method

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Effect test

Embodiment 1

[0036] How the present invention is implemented is specifically illustrated with the production process of Φ200mm specification steel.

[0037] The specific process steps are:

[0038] (1) Smelting and alloying, electric furnace smelting, tapping, refining outside the furnace, and vacuum degassing. The deoxidation and degassing smelting control of steel is strengthened through ladle blowing argon and vacuum degassing treatment, and the final deoxidation is fed to aluminum wire, and B iron is added after vacuum degassing treatment to ensure that the chemical composition, especially the effective boron content, meets the requirements, and the hydrogen content in the steel is not high. Greater than 2×10 -6 , the oxygen content is not more than 15×10 -6 .

[0039] (2) Pouring, mold casting, control of superheat, the superheat of molten steel in mold casting ladle is 70-80°C, and the control pouring speed is 390-250mm / min (3 tons of ingots), to ensure the quality of steel ingots...

Embodiment 2

[0049] How the present invention is implemented is specifically illustrated with the production process of Φ100mm specification steel.

[0050] The specific process steps are:

[0051] (1) Smelting and alloying, electric furnace smelting, tapping, refining outside the furnace, and vacuum degassing. Strengthen the smelting control of deoxidation and degassing of steel by blowing argon in the ladle and vacuum degassing treatment, feed the aluminum wire into the final deoxidation treatment, and add B iron after vacuum degassing treatment to ensure that the chemical composition, especially the effective boron content meets the requirements, and the hydrogen content in the steel Not greater than 2×10 -6 , the oxygen content is not more than 15×10 -6 .

[0052] (2) Pouring, continuous casting, control of superheat, continuous casting tundish superheat of 20-30°C, control of continuous casting casting speed of 0.55-1.0m / min (optimized according to billet shape), to ensure the qual...

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Abstract

The invention relates to medium carbon bearing steel and process for preparation, belonging to the technical field of bearing steel material and process technology. According to weight percentage, the range of the chemical components of the medium carbon bearing steel includes that C holds 0.50% to 1.0%, Si is 0.60% to 1.50%, Mn takes 0.50% to 1. 20%, Mo is 0.15% to 1.0%, V takes 0.15% to 1.0%, Cr and Ni are equal to or less than 0.30%, Cu is equal to or less than 0.15%, S is equal to or less than 0.025%, P is equal to or less than 0.025%, B takes 0.0005% to 0.0035%, (O) is equal to or less than 15*10-6%, (H) is equal to or less than 2*10-6%, the rest is Fe and unavoidable foreign matters. The invention also provides the process for preparing beating steel, and round steel with the size of phi 70 to 150 millimeters can be produced by the process for preparation. The bearing steel can substitute for carburizing bearing steel, such as G20CrNi2Mo and the like, to be applied, and can substitute for import bearings in the field of rolling mills and the like. The invention can reduce the manufacture cost of the bearing and the utilization cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a bearing steel and a manufacturing method thereof, in particular to a bearing steel used for manufacturing impact-resistant and heavy-duty rolling mill bearings or metallurgical and mining roller cone bit bearings, oil drilling turbine drilling tool bearings, and railway vehicle bearings. Bearing steel and its manufacturing method. Background technique [0002] At present, the rolling mill is developing towards high speed, heavy load, high strength, high rigidity, high precision, continuous rolling and automation. The rolling mill bearing is a key part of the rolling mill, which is directly related to the production efficiency, product quality and production cost of the rolling mill. Compared with general-purpose bearings, rolling mill bearings have the following characteristics: (1) The working load is large. Generally speaking, the rolled piece is rolled when it is bitten, th...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/16C22C38/24C22C38/46C22C33/04C21C7/06C21C7/072C21C7/10B21B37/74C21D8/00B22D11/16B22D15/00B22D37/00
Inventor 董杰吉王广连戈文英杜显彬翟正龙郑桂芸李猛张伟孙永喜张利平孙进
Owner LAIWU IRON & STEEL GRP
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