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Thermal treatment method for railway wagon sliding chute wearing plate and side frame column wearing plate

A heat treatment method and technology for railway wagons, applied in heat treatment furnaces, heat treatment equipment, railway car body parts, etc., can solve the problems of easy deformation and cracking, easy deformation, cracking, etc., and achieve the effect of uniform hardness and improved effect.

Active Publication Date: 2012-09-19
株洲春华实业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a heat treatment method for the wear plate of the chute of the railway freight car and the wear plate of the side frame column in view of the deficiency that the heat treatment of the wear plate of the chute of the railway freight car and the wear plate of the side frame column is very easy to deform and crack. The method can effectively solve the problem that the wear plate of the railway freight car chute and the wear plate of the side frame column are very easy to deform and crack after heat treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for heat treatment of a railway freight car chute wear plate and a side frame column wear plate, at least comprising the following steps:

[0023] (1) Heating: Place the wear plate neatly in the charging frame and heat it in a common resistance furnace at a heating temperature of 880°C, which is 20-30°C higher than the original ordinary process, which is conducive to the full integration of alloy elements in the workpiece into the matrix structure , to ensure uniform hardness after quenching;

[0024] (2) Quenching cooling does not use conventional water or oil, but is carried out in a nitrate bath at 260-300 °C. The formula of the nitrate bath is 50% each of potassium nitrate and sodium nitrite, depending on the material and size of the wear plate , add 1-5% water in the salt bath furnace before quenching and cooling; according to the size of the wear plate, the isothermal cooling time in the nitrate bath is 45-90 minutes;

[0025] (3) Take the workpiece out ...

Embodiment 2

[0028] A method for heat treatment of a railway freight car chute wear plate and a side frame column wear plate, at least comprising the following steps:

[0029] (1) Heating: Place the wear plate neatly in the charging frame and heat it in a common resistance furnace at a heating temperature of 880-890°C, which is 20-30°C higher than the original ordinary process, which is conducive to the full integration of the alloy elements in the workpiece into the matrix In the structure, the hardness after quenching is guaranteed to be uniform;

[0030] (2) Quenching cooling does not use conventional water or oil, but is carried out in a nitrate bath at 260-300 °C. The formula of the nitrate bath is 50% each of potassium nitrate and sodium nitrite, depending on the material and size of the wear plate , add 1-5% water in the salt bath furnace before quenching and cooling; according to the size of the wear plate, the isothermal cooling time in the nitrate bath is 45-90 minutes;

[0031]...

Embodiment 2

[0035] Embodiment 2 The performance of the product after quenching and tempering treatment is more stable, especially through pressing, positioning, quenching and tempering treatment, the deformation of the product can be greatly reduced, and the qualified rate of the product is greatly improved.

[0036] The advantage of the present invention is that the effect of heat treatment can be effectively improved by improving the heat treatment method and process conditions of the wear plate, and has the following advantages:

[0037] 1. The hardness of workpiece heat treatment is uniform and stable;

[0038] 2. It can effectively solve the problem that the wear plate of the railway wagon chute and the wear plate of the side frame column are very easy to deform and crack after heat treatment.

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Abstract

The invention discloses a thermal treatment method for a railway wagon sliding chute wearing plate and a side frame column wearing plate. The thermal treatment method is characterized by comprising at least the following steps of: (1) heating: tidily placing the wearing plates in a loading frame, and heating in a normal resistance furnace, wherein the heating temperature is 20-30 DEG C higher than that of the normal process, full fusion of total elements in a workpiece into a matrix structure is facilitated, and uniform and consistent hardness after quenching is guaranteed; (2) quenching in a nitrate bath tank of 260-300 DEG C other than in conventional water or oil, wherein the formula of a nitrate bath comprises 50 percent of potassium nitrate and 50 percent of sodium nitrate respectively; and adding 1-5 percent of water before quenching according to different materials and sizes of the wearing plates, wherein the isothermal cooling time in the nitrate bath tank is 45-90 minutes according to different sizes of the wearing plates; (3) taking the workpiece out of the nitrate bath tank, draining the residual nitrate bath and cleaning residual salt in hot water; and (4) checking hardness and deformation of the workpiece and performing tempering treatment if the hardness is high.

Description

technical field [0001] The invention relates to a metal material and a heat treatment process thereof, in particular to a heat treatment method for a wear plate of a railway freight car chute and a wear plate of a side frame column, and belongs to the field of material engineering. Background technique [0002] Truck wear plates are small accessories commonly used on vehicles, mainly used between moving parts. There are many kinds of wear plates on railway wagons; among them, the wear plates of the chute of railway wagons and the wear plates of side frame columns are two kinds of wear plates with large consumption; It is an important accessory on the bogie of railway vehicles. Most of these two types of wear plates are made of high-quality alloy steel, and the material is mostly made of T10A / 47Mn2Si2TiB; generally, they are first made and shaped according to the requirements, and then heat-treated to make the performance of the material meet the required requirements. The r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D9/00B61G9/20
Inventor 姚春华许光华洪宇
Owner 株洲春华实业有限责任公司
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