A kind of high-density pearlite steel rail and its preparation method

A technology of pearlite and steel rails, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of precise control of heating furnace and heat treatment control that do not involve composition control, and achieve the effect of improving strength and toughness indicators and excellent wear resistance

Active Publication Date: 2021-12-28
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent only implements accelerated cooling on the rail head, and does not involve the influence of heat transfer behavior at the side of the rail head and the lower jaw on the refined structure
Chinese patent CN1884606A "A Superfine Pearlitic High-Strength Rail Steel" stipulates a method for preparing ultrafine pearlitic rails, which only realizes pearlite refinement by heating + hot rolling, and does not involve an online heat treatment process
[0006] It can be seen that in the prior art, the refinement of pearlitic rails is mainly focused on rail heat treatment and multi-pass rolling process control, and does not involve precise control of the whole process including composition control, precise control of heating furnace, and heat treatment control.

Method used

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  • A kind of high-density pearlite steel rail and its preparation method
  • A kind of high-density pearlite steel rail and its preparation method
  • A kind of high-density pearlite steel rail and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The invention is used to explain the preparation method of the steel rail with high-density pearlite structure.

[0064] Furnace material is smelted into molten steel through converter smelting or electric furnace smelting, aluminum-free deoxidation, LF refining, RH vacuum treatment or VD vacuum treatment, continuous casting of molten steel into billets, heating of billets in heating furnace, high-pressure water dephosphorization, and online rolling of billets into rails , on-line heat treatment, straightening, flaw detection and processing;

[0065]The heating of the billet into the heating furnace includes a preheating stage, a heating stage and a soaking stage. The preheating time of the preheating stage is 50 minutes, and the temperature in the furnace is 610 ° C; the heating time of the heating stage is 100 minutes, and the temperature in the furnace is 1000 ° C ; The soaking time in the soaking stage is 40 minutes, and the temperature in the furnace is 1175°C;

...

Embodiment 2

[0069] Furnace material is smelted into molten steel through converter smelting or electric furnace smelting, aluminum-free deoxidation, LF refining, RH vacuum treatment or VD vacuum treatment, continuous casting of molten steel into billets, heating of billets in heating furnace, high-pressure water dephosphorization, and online rolling of billets into rails , on-line heat treatment, straightening, flaw detection and processing;

[0070] The heating of the billet into the heating furnace includes a preheating stage, a heating stage and a soaking stage. Among them, the preheating time of the preheating stage is 30 minutes, and the temperature in the furnace is 700 ° C; the heating time of the heating stage is 130 minutes, and the temperature in the furnace is 950 ° C ; The soaking time in the soaking stage is 30 minutes, and the temperature in the furnace is 1225°C;

[0071] The on-line heat treatment includes air cooling the rail with residual heat after final rolling to 780°...

Embodiment 3

[0074] Furnace material is smelted into molten steel through converter smelting or electric furnace smelting, aluminum-free deoxidation, LF refining, RH vacuum treatment or VD vacuum treatment, continuous casting of molten steel into billets, heating of billets in heating furnace, high-pressure water dephosphorization, and online rolling of billets into rails , on-line heat treatment, straightening, flaw detection and processing;

[0075] The heating of the billet into the heating furnace includes a preheating stage, a heating stage and a soaking stage. Among them, the preheating time of the preheating stage is 80 minutes, and the temperature in the furnace is 540 ° C; the heating time of the heating stage is 160 minutes, and the temperature in the furnace is 1150 ° C ; The soaking time in the soaking stage is 50 minutes, and the temperature in the furnace is 1150°C;

[0076] The on-line heat treatment includes air cooling the rail with residual heat after final rolling to 840...

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Abstract

The invention relates to the technical field of steel rail preparation, and discloses a high-density pearlite structure steel rail and a preparation method thereof. The method includes converter smelting or electric furnace smelting, aluminum-free deoxidation, LF refining, RH vacuum treatment or VD vacuum treatment, continuous casting of molten steel into billets, heating of billets in heating furnaces, high-pressure water dephosphorization, on-line rolling of steel billets, on-line heat treatment and Post-treatment; on-line heat treatment includes air cooling the rail after final rolling to 780-840°C, and then cooling the rail head with a mixture of compressed air and the cooling rate of the rail head at 2.8-3.8°C/s; Compressed air cooling, the cooling rate of the lower jaw of the rail is controlled at 1.6-3.2°C/s, and the cooling temperature of the rail head drops to 450-520°C when it is air-cooled to room temperature. The strength and toughness index of the high-density pearlite structure steel rail prepared by the invention is significantly improved, has excellent wear resistance and contact fatigue resistance, and is suitable for heavy-duty railways.

Description

technical field [0001] The invention relates to the technical field of rail preparation, in particular to a high-density pearlite structure rail and a preparation method thereof. Background technique [0002] The development of high-speed and heavy-duty railways puts forward more stringent requirements for rail materials and their service performance. As the running part of the railway, the quality and performance of rails seriously restrict the transportation efficiency and driving safety. With the improvement of railway transportation capacity, the service environment of rails is becoming more and more harsh and complex, and various damages are prominent. Some small radius curves At the same time, the steel rails in the road section suffered from excessive wear, peeling off pieces and other damages, which affected the development and breakthrough of railway transportation. [0003] At present, in order to adapt to changes in the line, rail manufacturers will mainly develo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/04C22C38/24C22C38/26C22C38/02C21D1/18C21D1/613C21D6/00C21D8/00C21D9/04
CPCC22C33/04C22C38/02C22C38/04C22C38/24C22C38/26C22C38/002C21D1/18C21D1/613C21D6/002C21D6/005C21D6/008C21D8/005C21D9/04C21D2211/009
Inventor 杨大巍邓勇邹明李晓煜
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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