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A heat treatment method for medium-carbon low-alloy steel road wheels

A heat treatment method and low-alloy steel technology, applied in heat treatment furnaces, heat treatment equipment, process efficiency improvement, etc., can solve the problems of large shear stress of the wheel rim, shorten the service life of the wheel, increase the loss of tools and dies, etc., to reduce cutting The effect of machining allowance, improving performance and increasing yield

Active Publication Date: 2018-10-23
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The abnormal tissue layer under the tread is composed of sorbite, bainite, etc., which is a mixed tissue layer. It is harder and brittle than the normal fine pearlite + ferrite structure, and it is easy to peel off under the action of wheel-rail contact stress. , falling off, destroying the smoothness and integrity of the wheel tread, it needs to be repaired before it can continue to be used, which shortens the service life of the wheel
Due to the hard and brittle characteristics of the abnormal tissue layer, it is difficult for the tread of the wheel to undergo appropriate small deformation at the initial stage of use, and it is difficult to quickly obtain an ideal geometric matching relationship between the wheel and rail, resulting in a large shear stress inside the rim of the wheel. Increased chance of early contact fatigue damage
In addition, in order to eliminate or reduce the adverse effects of the abnormal tissue layer, more cutting processing is required in the later stage of wheel manufacturing, which increases the loss of cutting tools and molds, and increases the production cost

Method used

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  • A heat treatment method for medium-carbon low-alloy steel road wheels
  • A heat treatment method for medium-carbon low-alloy steel road wheels
  • A heat treatment method for medium-carbon low-alloy steel road wheels

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Effect test

Embodiment 1

[0034] A kind of heat treatment method of medium-carbon low-alloy steel road wheel, the chemical composition and weight percentage of medium-carbon low-alloy steel road wheel are as shown in embodiment 1 in table 1, and described heat treatment method comprises the following steps:

[0035] (1) Send the rolled and slow-cooled wheels into the quenching furnace, and raise the temperature to 845°C with the furnace, and the heating time is 2.5h;

[0036] (2) Take it out of the furnace and send it to the horizontal quenching table, spray water for cooling for 300s, the water pressure is 0.35MPa, and the flow rate is 35L / min;

[0037] (3) After quenching, send the water-cooled wheel into the tempering furnace, heat up to 500±10°C with the furnace, keep it warm for 4 hours, and let it cool naturally to below 200°C;

[0038] (4) After the tempering is completed, send the wheel obtained in step (3) into the quenching heating sensor, clamp it in place so that the distance between the wh...

Embodiment 2

[0049] A kind of heat treatment method of medium-carbon low-alloy steel road wheel, the chemical composition and weight percent of medium-carbon low-alloy steel road wheel are as shown in embodiment 2 in table 1, and described heat treatment method comprises the following steps:

[0050] (1) Send the rolled and slow-cooled wheels into the quenching furnace, and raise the temperature to 855°C with the furnace, and the heating time is 2.5h;

[0051] (2) Take it out of the furnace and send it to the horizontal quenching table, spray water for cooling for 300s, the water pressure is 0.37MPa, and the flow rate is 40L / min;

[0052] (3) After quenching, send the water-cooled wheel into the tempering furnace, heat up to 500±10°C with the furnace, keep it warm for 4 hours, and let it cool naturally to below 200°C;

[0053] (4) After the tempering is completed, send the wheel obtained in step (3) into the quenching heating sensor, clamp it in place so that the wheel to be heated is 20 m...

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Abstract

The invention provides a heat treatment method of a medium carbon low-alloy steel railway wheel, comprising the following processes: heating by quenching a railway wheel at 840-860 DEG C after rollingand slow cooling, cooling by spraying water after discharging, tempering at 500+ / -10 DEG C, carrying out power frequency induction heating at 890-910 DEG C, and carrying out pressure-air cooling. Theheat treatment method aims to remarkably reduce depth of an abnormal structure area on near surface of a tread or completely eliminate the abnormal structure layer on the basis of maintaining original mechanical properties of the wheel, so as to improve use performance of the wheel and lower cutting process cost.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of rail vehicle wheels, and relates to a heat treatment method for medium-carbon low-alloy steel road wheels, in particular to a method with strict requirements on the depth of the abnormal tissue layer under the tread, a running speed of ≥250km, and a single axle load of 16-16 Heat treatment method for wheels used in 17t EMUs. Background technique [0002] At present, the heat treatment of steel-rolled integral wheels for railways at home and abroad mostly adopts the overall heating and tread spray quenching process to improve the wear resistance of the wheel rim, improve the stress distribution of the wheel rim, obtain the necessary strength and toughness matching, and prolong the use of the wheel. life. Among them, the tread spray quenching process basically adopts a continuous forced cooling process with high water pressure and large water volume to quench and cool the austenitized whe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/34C21D1/42C21D1/18C22C38/04C22C38/02C22C38/24C22C38/20C22C38/22C22C38/46C22C38/44C22C38/42
CPCY02P10/25
Inventor 姚三成陈刚江波宫彦华赵海邹强陈讲彪钟斌鲁松王志刚童乐
Owner MAGANG (GROUP) HOLDING CO LTD
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