Nitrogen-added 20MnCr5 gear steel and production method thereof

A 20mncr5, production method technology, applied in the field of metallurgical manufacturing, can solve the problems of unfavorable hardenability narrow-band control, wide alloy content control range, no production control method, etc., achieve good composition uniformity and reduce composition segregation , The effect of narrowing the hardenability

Inactive Publication Date: 2015-11-11
SGIS SONGSHAN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The oxygen content in the steel is poorly controlled, which will reduce the fatigue life of the gear; at the same time, the control of the N element and the production control method of the O content are not mentioned in the article
[0008] The document "Development of Mn-Cr Series Gear Steel" published by "Special Steel" in September 2002 introduced that Si in steel should be controlled below 0.12%, which solved the problem of 20MnCr5 intergranular oxidation depth, but the control range of alloy content in steel Wider, not conducive to hardenability narrow band control

Method used

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  • Nitrogen-added 20MnCr5 gear steel and production method thereof
  • Nitrogen-added 20MnCr5 gear steel and production method thereof
  • Nitrogen-added 20MnCr5 gear steel and production method thereof

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Embodiment Construction

[0020] Below in conjunction with embodiment the present invention is further described.

[0021] A nitrogen-added 20MnCr5 gear steel, its composition and weight percentage (Wt%) are: C: 0.18%~0.21%, Si: ≤0.12%, Mn: 1.25%~1.35%, Cr: 1.16%~1.24%, P: ≤0.020%, S: 0.020%~0.030%, Al: 0.025%~0.045%, N: 0.0060%~0.0100%, including the following residual components by weight percentage (Wt%): Ni: ≤0.10%, Cu : ≤0.10%, B≤0.0003%, [O]≤15×10 -6 . The remainder is Fe and some other trace residual elements.

[0022] A kind of production method of nitrogen-added 20MnCr5 gear steel, its production steps are:

[0023] The first step: Converter smelting, strictly control the content of free oxygen and P in the steel at the end point, eliminate the slag after tapping, and control the free oxygen in the steel to ≤400ppm; P≤0.015%;

[0024] The second step: refining outside the furnace. After taking the first component sample, adjust the S in the steel to 0.023%~0.027% according to the detected ...

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Abstract

The invention relates to nitrogen-added 20MnCr5 gear steel. The gear steel comprises, by weight, 0.18-0.21% of C, Si with the amount smaller than or equal to 0.12%, 1.25-1.35% of Mn, 1.16-1.24% of Cr, P with the amount smaller than or equal to 0.020%, 0.020-0.030% of S, 0.025-0.045% of Al and 0.0060-0.0100% of N. The gear steel further comprises, by weight, Ni with the amount smaller than or equal to 0.10%, Cu with the amount smaller than or equal to 0.10%, B with the amount smaller than or equal to 0.0003%, O with the amount smaller than or equal to 15*10-6, and the balance Fe and other trace residual elements. The gear steel has the advantages of being stable in performance, small in heat treatment deformation and good in surface quality, and achieving hardenability band narrowing.

Description

technical field [0001] The invention belongs to the technical field of metallurgical manufacture, and relates to a nitrogen-added 20MnCr5 gear steel used for automobile rear axle gears, shafts, worms and other parts and a production method thereof. Background technique [0002] Mn-Cr series gear steel is a steel grade imported from Germany in my country, and it is a high-standard steel for car gears. Domestically produced cars such as Audi, Jetta, and Santana all use this series of steel grades. 20MnCr5 steel belongs to carburizing steel, and it is required to be used after quenching and tempering. This steel has good hardenability, small heat treatment deformation, good low-temperature toughness, and good cutting performance. It can be used as carburized parts and quenched and tempered parts with large cross-sections. At home and abroad, 20MnCr5 steel requires high purity, good surface quality, narrow dimensional tolerance, good cold working performance, uniform structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C38/28
Inventor 刘年富吴学兴岳峰谢慧琴
Owner SGIS SONGSHAN CO LTD
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