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Method of carbonitriding a steel component, the steel component and the use of the component

A technology of carbonitriding and steel components, which is applied to bearing components, rotating parts resistant to centrifugal force, bearings, etc., and can solve problems such as increased noise and fatigue cracking

Inactive Publication Date: 2014-01-29
AB SKF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Stresses are concentrated around the edges of these indentations, and the concentration of contact stress may eventually lead to fatigue cracking
The use of components damaged in this way may also result in an increase in the noise generated by these components

Method used

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  • Method of carbonitriding a steel component, the steel component and the use of the component
  • Method of carbonitriding a steel component, the steel component and the use of the component
  • Method of carbonitriding a steel component, the steel component and the use of the component

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Experimental program
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Embodiment Construction

[0029]Figure 1 shows a heat treatment cycle according to the prior art. The steel components were subjected to a carbonitriding (CN) process at a temperature of 850 °C. The process environment is set up by introducing methane / propane / natural gas (for carbon) and ammonia (for nitrogen) into the furnace under controlled carrier gas conditions. By maintaining a suitable proportion of the working gas, the component is provided with a thin carbonitriding layer of carbon-nitrogen-rich steel. The component is then reheated to 820°C and subsequently quenched to achieve full surface hardness. Quenching may be performed in an oil or salt bath with a bath temperature selected to achieve optimum performance with acceptable levels of dimensional change. Hot oil / salt bath quenching can be used to minimize twisting of complex components. Low-temperature tempering can be performed to make steel components tough.

[0030] figure 2 The method according to the invention is shown. The metho...

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Abstract

Method for heat treating a steel component (28, 36) to provide the steel component (28, 36) with a surface having improved wear resistance. The method comprises the steps of carbonitriding the steel component (28, 36) at a temperature of 930-970 DEG C, cooling the steel component (28, 36), re-heating the steel component (28, 36) to a temperature of 780-820 DEG C and either quenching the steel component (28, 36) to form martensite and tempering, or quenching the steel component (28, 36) to form bainite and tempering.

Description

technical field [0001] The present invention relates to a method of heat treating a steel component to provide the steel component with a surface having improved wear resistance. The invention also relates to a steel component with a carbonitrided layer and the use of such a steel component under contaminated and / or poorly lubricated conditions. Background technique [0002] Carbonitriding is a metallurgical surface modification technology used to increase the surface hardness of metal components, thereby reducing the wear of components during use. During carbonitriding, atoms of carbon and nitrogen diffuse interstitially into the metal, facilitating barrier slippage and increasing hardness in layers typically 0.1 to 0.3 mm thick near the surface. Carbonitriding is usually carried out at a temperature of 850-860°C. [0003] Carbonitriding is commonly used to improve the wear resistance of steel components containing low or medium carbon steel and no high carbon steel. Whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/32F16C33/00
CPCF16C2204/66C23C8/80F16C33/30C23C8/32F16C2300/02
Inventor S.拉森P.纽曼
Owner AB SKF