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A heat treatment method for railway wagon axles

A process method and technology of railway wagons, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems that the sound transmission performance of axles cannot meet the requirements, and achieve the effect of improving sound transmission performance and good mechanical properties

Active Publication Date: 2016-07-27
CRRC YANGTZE TONGLING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the axle is heat-treated, its mechanical properties and metallographic structure meet the requirements of AARM101, but the sound transmission performance of the axle does not meet the requirements

Method used

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  • A heat treatment method for railway wagon axles
  • A heat treatment method for railway wagon axles
  • A heat treatment method for railway wagon axles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a heat treatment process for railway freight car axles. The relationship between the carbon content of the axle and the process parameters of each step of heat treatment is shown in Table 1.

[0029] Table 1

[0030]

[0031] Among them, ±10°C in each temperature parameter is the heating accuracy of the heating furnace in the heat treatment process.

Embodiment 2

[0033] This embodiment provides a heat treatment process for railway freight car axles. The relationship between the carbon content of the axle and the process parameters of each step of heat treatment is shown in Table 2.

[0034] Table 2

[0035]

[0036] Among them, ±10°C in each temperature parameter is the heating accuracy of the heating furnace in the heat treatment process.

Embodiment 3

[0038] This embodiment provides a heat treatment process for railway freight car axles. The relationship between the carbon content of the axle and the process parameters of each heat treatment step is shown in Table 3.

[0039] table 3

[0040]

[0041] Among them, ±10°C in each temperature parameter is the heating accuracy of the heating furnace in the heat treatment process.

[0042] From the axle heat treatment process introduced in the above examples, it can be seen that the axle has been normalized twice and tempered once during the heat treatment process. The holding temperature of the two normalizings is different, and its purpose and function are also different. The temperature of the first normalizing is high, 100-120°C higher than Ac3, and its main function is to homogenize the austenite of the axle, obtain a uniform structure, and prepare for the second normalizing. The temperature of the second normalizing is low, 10-30°C higher than Ac3, so that when the axle...

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Abstract

The invention relates to the technical field of railway freight car axle production technology, in particular to a heat treatment process for railway freight car axles. The heat treatment process method includes the following steps: performing the first normalizing on the axle, and the heat preservation temperature of the first normalizing is 100°C-120°C higher than the Ac3 temperature of the axle, so that the axle Homogenize the austenite; carry out the second normalizing on the axle, the holding temperature of the second normalizing is 10°C-30°C higher than the Ac3 of the axle, so that the axle is austenitized Fine austenite grains are formed during the process; the axle is tempered to eliminate the internal stress of the axle. In the heat treatment process of the present invention, the heat preservation temperature adopted for the first normalizing enables the axle to obtain a more uniform structure, thereby improving the sound transmission performance of the axle, and ensuring uniform and refined ferrite and pearlite structures and good mechanical properties.

Description

technical field [0001] The invention relates to the technical field of railway freight car axle production technology, in particular to a heat treatment process for railway freight car axles. Background technique [0002] Axle is an important part of a railway vehicle, and its performance is directly related to the driving safety of the vehicle. The LZ50 axle steel currently used in my country is the same as the AARF grade axle steel, which has excellent characteristics such as high strength, high toughness and high fatigue resistance, and has been widely used in the production of axles for railway vehicles. The AARF grade axle and LZ50 steel adopt the same heat treatment process, and its mechanical properties and grain size fully meet the requirements of AARM101. [0003] At present, axle heat treatment is carried out by hanging chain heat treatment production line. The suspension chain heat treatment production line is an intelligently controlled heat treatment equipment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/28
Inventor 付祥武永亮江锐锋左云清石胜平王晓彬刘涛
Owner CRRC YANGTZE TONGLING CO LTD
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