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Thermal treatment method for high-carbon steel train wheel circular rim surface and heat treatment apparatus

A heat treatment method and high-carbon steel technology, applied in quenching devices, heat treatment furnaces, heat treatment equipment, etc., can solve the problems of increased hardness of the surface of the tread surface, reduce the service life of the wheel, and affect the service life of the wheel, so as to improve the anti-contact fatigue performance , reduce the contact stress level and reduce the effect of tread peeling

Active Publication Date: 2008-09-24
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The abnormal structure produced during the heat treatment cooling process is harder and more brittle than the normal ferrite-pearlite structure, and it is easy to peel off under the action of wheel-rail contact stress, destroying the smoothness and integrity of the wheel tread. It can continue to be used after repairing, which directly reduces the service life of the wheel; at the same time, the existence of abnormal structures makes the surface hardness of the tread significantly increased, and it is difficult for the tread of the new wheel to deform properly in the initial stage of use to obtain an ideal wheel-rail geometric matching relationship as soon as possible. The rim of the wheel is subjected to excessive contact stress, which is prone to early contact fatigue damage and seriously affects the service life of the wheel

Method used

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  • Thermal treatment method for high-carbon steel train wheel circular rim surface and heat treatment apparatus
  • Thermal treatment method for high-carbon steel train wheel circular rim surface and heat treatment apparatus
  • Thermal treatment method for high-carbon steel train wheel circular rim surface and heat treatment apparatus

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] When the train wheel 4 is heated as a whole, the rim of the train wheel 4 is kept in a high temperature state in the austenite region; the wheel tread 10 is sprayed and cooled for a short time with a small flow of water, so that the wheel tread 10 is lowered by 10mm The temperature in the wheel rim drops to a certain temperature range below A1; the wheel tread 10 is forced to spray water for a long time to cool the wheel tread 10 with a large flow rate, so that the metal inside the wheel rim is accelerated and fully cooled.

Embodiment 2

[0054] Different nozzles are used for spraying water with different flow rates.

[0055] If the same nozzle is used, different flow rates cannot meet the required injection requirements. If a small nozzle is used, the flow rate cannot be satisfied when the flow rate is large; if a large nozzle is used, the injection pressure and range cannot meet the requirements when the flow rate is small.

Embodiment 3

[0057] The technological process of the heat treatment method of train wheel 4 of the present invention is:

[0058] First the train wheel 4 is placed in the horizontal quenching table 9;

[0059] When heating, the rim heating temperature of the train wheel 4 is 800°C to 810°C;

[0060] Then with a group of small flow nozzles 5 arranged around the wheel tread 10, water is sprayed to the rotating wheel tread 10, and the cooling time is controlled by spraying water for a short time, so that the temperature at 5mm below the wheel tread 10 is reduced to 650°C-690°C. ℃ temperature range, at this time, a layer of reticular ferrite-pearlite structure is formed on the surface layer of the wheel tread 10;

[0061] At the same time, control the cooling time so that the temperature inside the rim of the wheel and within the range of 10 mm to 45 mm below the tread surface of the wheel still exceeds Ac3, and the tissue transformation has not yet occurred;

[0062] Switch nozzles, and use...

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Abstract

The invention discloses a heat treatment method of a wheel rim surface of the train wheel with high carbon steel. The method is carried out as follows: during the cooling process, the wheel tread of train wheel is firstly cooled by spraying water with small flow in short time, then large flow in long time. The invention also discloses a heat treatment device of using the method. An water feed tubular tube comprises a water feed tubular tube with large flow and a water feed tubular tube with small flow, the water feed tubular tube with large flow is communicated with a plurality of nozzles with large flow, and the water feed tubular tube with small flow is communicated with a plurality of nozzles with small flow. Adopting the technical proposal can improve the contacting fatigue resistance of train wheel, reduces the tread spalling of train wheel; obtains the appropriate geometric matching relation between wheels and rails as soon as possible, increases the contact area, decreases the contact stress level; promotes the wear resistance of the internal part of wheel rim, thereby promoting the service life of wheel; can not increase the operation difficulty of the heat treatment and cooling technology of wheels.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and relates to the heat treatment technology of rolled steel integral wheels for railways. More specifically, the invention relates to a heat treatment method for the rim surface of high-carbon steel train wheels. In addition, the present invention also relates to a corresponding heat treatment device applying the above-mentioned method. Background technique [0002] For a long time, domestic freight car wheels have been made of C-Mn carbon steel with a material of C≤0.65%, and the microstructure of the wheel rim after heat treatment is ferrite-pearlite. With the development of China's railway freight towards heavy loads, the problems of abnormal wear and stacking of truck wheels have become increasingly prominent. The reason is mainly related to the poor contact fatigue strength and wear resistance of the existing truck wheel steel materials. [0003] The way to effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/34C21D1/18C21D1/667
Inventor 陈刚王世付江波李翔钟斌程德利龚志翔赵海
Owner MAANSHAN IRON & STEEL CO LTD
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