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Quenching cooling method for bainite steel frog point rail

A technology of bainitic steel and a cooling method, which is applied in the field of quenching and cooling of bainitic steel frog core rails, can solve the problems of inability to industrialize, large-scale deformation prevention, single quick cooling adjustment method, and small adjustment range, etc. The effect of uniform performance index, small deformation and stable process

Active Publication Date: 2021-12-07
CHINA RAILWAY BAOJI BRIDGE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem solved by the present invention is to provide a method for quenching and cooling the bainite steel frog core rail, which adopts the cooling method of any combination of air cooling, spraying, and non-contact water cooling and heat exchange, which can be reversed up and down and partitioned, to solve the problem of railway Large-scale long-axis parts such as frog rails have a single quick-cooling adjustment method and a small adjustment range; technical problems that cannot be industrialized, large-volume, anti-deformation, efficient, and quality-stable quenching production

Method used

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  • Quenching cooling method for bainite steel frog point rail
  • Quenching cooling method for bainite steel frog point rail
  • Quenching cooling method for bainite steel frog point rail

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A method for quenching and cooling a bainite steel frog core rail, comprising the following steps:

[0052] S001, the furnace door 6 of the quenching and rapid cooling chamber is opened; the reclaimer places the core rails that need to be rapidly cooled at a fixed distance before on the support 2; the furnace door 6 of the quenching and rapid cooling chamber is closed.

[0053] S002. Manually click the start button, and the quenching rapid cooling chamber starts to execute the rapid cooling procedure.

[0054] S003. In the 920-650°C high-temperature cooling stage in the rapid cooling program, in the quenching rapid cooling chamber, combine the air cooling device 3 with the reversing function and partition function with the non-contact water cooling heat exchange device 5 to perform cooling on the frog core rail. Cool down.

[0055] In step S003, further: the centrifugal fan 31 used by the air cooling device 3 rotates at 1400 rpm, and blows air at the maximum rated spee...

Embodiment 2

[0070] A method for quenching and cooling a bainite steel frog core rail, comprising the following steps:

[0071] S001, the furnace door 6 of the quenching and rapid cooling chamber is opened; the reclaimer places the core rails that need to be rapidly cooled at a fixed distance before on the support 2; the furnace door 6 of the quenching and rapid cooling chamber is closed.

[0072] S002. Manually click the start button, and the quenching rapid cooling chamber starts to execute the rapid cooling procedure.

[0073] S003. In the 920-650°C high-temperature cooling stage in the rapid cooling program, in the quenching rapid cooling chamber, combine the air cooling device 3 with the reversing function and partition function with the non-contact water cooling heat exchange device 5 to perform cooling on the frog core rail. Cool down.

[0074] In step S003, further: the centrifugal fan 31 used by the air cooling device 3 rotates at 1400 rpm, and blows air at the maximum rated spee...

Embodiment 3

[0082] A method for quenching and cooling a bainite steel frog core rail, comprising the following steps:

[0083] S001, the furnace door 6 of the quenching and rapid cooling chamber is opened; the reclaimer places the core rails that need to be rapidly cooled at a fixed distance before on the support 2; the furnace door 6 of the quenching and rapid cooling chamber is closed.

[0084] S002. Manually click the start button, and the quenching rapid cooling chamber starts to execute the rapid cooling procedure.

[0085] S003. In the 920-650°C high-temperature cooling stage in the rapid cooling program, in the quenching rapid cooling chamber, combine the air cooling device 3 with the reversing function and partition function with the non-contact water cooling heat exchange device 5 to perform cooling on the frog core rail. Cool down.

[0086] In step S003, further: the centrifugal fan 31 used by the air cooling device 3 rotates at 1400 rpm, and blows air at the maximum rated spee...

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Abstract

The invention provides a quenching cooling method for a bainite steel frog point rail. The quenching cooling method comprises the following steps that a furnace door of a quenching rapid cooling chamber is opened; a point rail with the fixed distance is put by a material taking machine on a support and the furnace door is closed; a quick cooling program is started to execute; in the 920-650 DEG C high-temperature stage, air cooling and non-contact water cooling heat exchange are combined for cooling; in the medium temperature stage of 650-450 DEG C, air cooling and spray cooling are combined for cooling; and in the low-temperature stage of 450-200 DEG C, an air cooling device is independently used for conducting up-down reversing cooling. After the rapid cooling is finished, the quenching rapid cooling chamber automatically stops. According to the quenching cooling method for the bainite steel frog point rail, a cooling mode of any combination of air cooling, spraying and non-contact water cooling heat exchange is adopted, industrialized and large-scale quenching cooling production of a railway frog point rail is realized, and the quenching cooling method for the bainite steel frog point rail has the advantages of deformation prevention, high efficiency, higher economy and practicability, and stable and reliable quenching quality.

Description

technical field [0001] The invention belongs to the technical field of quenching and heat treatment of metal materials by chemical metallurgy, and in particular relates to a method for quenching and cooling bainitic steel frog core rails. Background technique [0002] Because of its excellent strength and toughness, bainitic steel has been widely used in applications requiring high strength, high hardness and high toughness, such as locomotive bearings and frog core rails. Since bainite belongs to a transitional structure between pearlite and martensite, the requirements for controlling the transformation temperature in the quenching process are very strict. Conventional methods such as water quenching, oil quenching, and liquid medium quenching are very difficult in actual production. It is difficult to guarantee the consistency of product quality. [0003] Predecessors have concluded through a large number of experimental studies that the best heat treatment process for b...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/667C21D9/00C21D11/00C21D6/00C22C38/02C22C38/04C22C38/34C22C38/44C22C38/58
CPCC21D1/18C21D9/0068C21D11/005C21D1/667C21D6/004C21D6/005C21D6/008C22C38/02C22C38/04C22C38/44C22C38/34C22C38/58C21D2211/002
Inventor 高尚君任伟伟王磊付涛郑会锋王贵雨
Owner CHINA RAILWAY BAOJI BRIDGE GRP
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