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Air-combined steam quenching apparatus and method for rails

A quenching device and rail technology, applied in the field of heat treatment, can solve the problems of inability to obtain quenching hardness and depth of hardened layer, too fast quenching cooling speed, quenching cracks, and too deep hardened layer, etc., so as to reduce the investment in quenching equipment, increase the Large hardening depth and the effect of improving the structure of the rail

Active Publication Date: 2019-10-25
WISCODRI WUGANG ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the quenching and cooling rate of steel parts is too slow, the required quenching hardness and hardened layer depth cannot be obtained; and if the cooling rate is too fast, it may cause quenching cracks and too deep hardened layer
At the same time, if the quenching cooling rate is too fast or the cooling rate is insufficient, it may cause out-of-tolerance deformation of the workpiece

Method used

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  • Air-combined steam quenching apparatus and method for rails
  • Air-combined steam quenching apparatus and method for rails
  • Air-combined steam quenching apparatus and method for rails

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Experimental program
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specific Embodiment

[0026] The present invention also provides specific embodiments as follows:

[0027] The 60AT rail test with steel type U75V was adopted, and pure air-cooled quenching and air+steam quenching were used respectively, and the test data were obtained as follows:

[0028] 1) Rail Surface Hardness

[0029] Table 1 Rail top surface hardness and rail tensile strength

[0030]

[0031] 2) Section hardness

[0032] Table 2 Hardness of rail section

[0033]

[0034] Rail section such as image 3 As shown, the distance between the first point and the surface is 5 mm, and the distance between other points is 5 mm. The distance between the D and E lines and the mandible is 5 mm, and the B and C lines are the angle bisectors of A, D and A, E lines.

[0035] 3) Microstructure

[0036] The microstructure of the full section of the air-quenched rail should be pearlite structure, containing a small amount of ferrite, and some rails contain a small amount of martensite, bainite and gr...

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Abstract

The invention relates to a wind combined steam quenching device and method for a steel rail. The device comprises a fan, a wind pipe, a steam pipe and a compound pipe; the wind pipe is connected with the fan; the wind pipe and the steam pipe are connected with the compound pipe; the interior of the compound pipe is of a sleeve structure, the interior of the sleeve structure is provided with a channel connected with the steam pipe, and the exterior of the sleeve structure is provided with a channel connected with the wind pipe; a nozzle is arranged at the end part of the compound pipe; a wind quantity control valve is arranged on the wind pipe; and a steam control valve is arranged on the steam pipe. The device carries out heat treatment on steel parts by adopting a wind and steam cooling mode; and the steam pipe is arranged in the wind cooling pipe, so that in the process of quenching the surface of the steel rail, steam is sprayed for cooling while wind is blown. The device can effectively increase the through hardening depth of the steel rail through steam cooling, improves the structure of the steel rail, and improves the quality and the performances of the quenched steel rail.

Description

technical field [0001] The invention relates to the field of heat treatment, and more specifically relates to a wind combined steam quenching device and method for steel rails. Background technique [0002] As we all know, quenching and cooling have high requirements and technical difficulties, which have always been the focus of heat treatment production. If the quenching and cooling rate of steel parts is too slow, the required quenching hardness and hardened layer depth cannot be obtained; and if the cooling rate is too fast, it may cause quenching cracks and too deep hardened layer. At the same time, too fast quenching cooling rate or insufficient cooling rate may cause out-of-tolerance deformation of the workpiece. Not only that, during the cooling process, the more complex the shape of the workpiece, the greater the temperature difference between different parts, and the more difficult it is to obtain no quenching cracks and no out-of-tolerance deformation. There is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/04C21D1/62
CPCC21D1/62C21D9/04
Inventor 朱俊华吴光行
Owner WISCODRI WUGANG ENG
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