Method for heat treatment of train wheel with improved turning ability

A heat treatment method and processing performance technology, applied in heat treatment furnaces, heat treatment equipment, wheels characterized by rail running parts, etc., can solve the problems of reduced labor productivity in machining, poor turning performance of wheels, and increased turning difficulty. Achieve the effect of reducing the maximum contact stress, improving turning performance and reducing tool loss

Inactive Publication Date: 2006-03-29
MAANSHAN IRON & STEEL CO LTD
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Problems solved by technology

However, the high hardness of the surface and the non-pearl structure make the turning performance of the wheel worse; the turning difficulty increases, the tool consumption increases, and the labor productivity of machining decreases.
In addition, due to the removal of part of the hardened layer on the working part of the wheel by machining, the hardness of the initial working part of the wheel is low, so the service life is significantly reduced

Method used

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  • Method for heat treatment of train wheel with improved turning ability
  • Method for heat treatment of train wheel with improved turning ability
  • Method for heat treatment of train wheel with improved turning ability

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Embodiment Construction

[0012] The wheel components used in the following preferred modes and comparative samples are: C: 0.62, Si: 0.29, Mn: 0.74, P: 0.018, S: 0.003, and the rest: trace amount.

[0013] Preferred way 1: Place the train wheels in a high-temperature state maintained in the austenite region in a horizontal quenching table. During the rotation of the wheel, the tread is cooled by spraying water for 20-25 seconds. The temperature measured by the thermocouple embedded 5mm below the tread is cooled to a certain temperature range below the austenite transformation temperature of the steel. The exact Said to be 595-610 ℃, stop spraying water, at this time the surface temperature of the tread is between 550-565 ℃, and a layer of 5-8mm thick pearlite structure is formed on the surface of the wheel tread. After the water spraying is stopped, the wheel is left to stand for 60-70 seconds to use the heat conduction in the high-temperature zone inside the rim to make the surface temperature rise a...

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Abstract

A heat treating technique of train wheel for improving its turning machinability includes making a train wheel at high temp for keeping in austenite region, spraying water to cool its tread temp to 550-600 deg.C, stopping spraying water, laying aside for returning its surface temp to 650-720 deg.C, or forced wind cooling to lower its tread temp to 650-720 deg.C, and spraying water for cooling it.

Description

technical field [0001] The technical solution to be protected by the present invention belongs to the technical field of heat treatment of steel-rolled monolithic wheels for railways. Background technique [0002] With the development of high-speed and heavy-duty railway transportation and the wide application of high-strength steel rails, the demand for fully processed wheels continues to increase. At the same time, in order to improve the contact fatigue strength and wear resistance of the wheels, the requirements for the hardness of the wheels are also further increased. At present, the technical means to improve the hardness of train wheels at home and abroad are generally: after the train wheels are austenitized and heated, the tread or the tread and its outer surface are directly sprayed with water to cool the outer surface. The characteristics of the obtained material are: the surface hardness of the wheel rim is the highest; The hardness gradient...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/34B60B17/00
Inventor 苏世怀张建平江波陈刚孔庆钢
Owner MAANSHAN IRON & STEEL CO LTD
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