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Method for producing anti-contact fatigue hypereutectoid steel rail

A contact fatigue and hypereutectoid technology, which is applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems affecting line operation efficiency and safety, hypereutectoid rail contact fatigue, etc., to achieve good wear resistance, Excellent contact fatigue resistance and high purity

Active Publication Date: 2022-02-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, the hypereutectoid rails prepared based on the existing technology are prone to contact fatigue, which seriously affects the operating efficiency and safety of the line.

Method used

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  • Method for producing anti-contact fatigue hypereutectoid steel rail
  • Method for producing anti-contact fatigue hypereutectoid steel rail
  • Method for producing anti-contact fatigue hypereutectoid steel rail

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Embodiment Construction

[0038] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with specific examples.

[0039] The main technological process of out-of-furnace refining includes LF refining and RH refining.

[0040] LF refining (ladle refining furnace method): Heating by electric arc, blowing argon at the bottom of the ladle and stirring.

[0041] Process advantages

[0042] 1) Arc heating has high thermal efficiency, large temperature rise range, and temperature control accuracy can reach ±5°C;

[0043] 2) With the function of stirring and alloying, argon blowing and stirring can easily realize narrow-range alloy composition control and improve product stability;

[0044] 3) Less equipment investment, low refining cost, suitable for producing ultra-low sulfur steel and ultra-low oxygen steel.

[0045] Key points of LF refining production process

[0...

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Abstract

The invention discloses a method for producing an anti-contact fatigue hypereutectoid steel rail. The method comprises the steps of molten iron desulfurization, converter smelting, LF refining, RH refining, continuous casting, billet heating, rolling and post-rolling heat treatment. The steel rail is obtained. The post-rolling heat treatment comprises the steps that accelerated cooling and air cooling are conducted on the rail head tread center, the two sides of a rail head and the rail bottom center of the steel rail obtained after rolling, the initial cooling temperature of accelerated cooling is 650-900 DEG C, the cooling speed is 1.0-5.0 DEG C / s, and the final cooling temperature is 400-550 DEG C; after the final cooling temperature is reached, accelerated cooling is stopped, and air cooling is performed to room temperature; based on the total mass of the steel rail, the steel rail comprises the following chemical components in percentage by mass: 0.9-1.2% of C. According to the hypereutectoid steel rail manufactured through the method for producing the anti-contact fatigue hypereutectoid steel rail, the tread hardness is larger than 420 HB, the laboratory abrasion loss of the steel rail is smaller than 0.2 g, and the contact fatigue performance is improved by 20%. The hypereutectoid steel rail is higher in purity, better in contact fatigue resistance and good in wear resistance.

Description

technical field [0001] The invention belongs to the technical field of rail production, and in particular relates to a method for producing anti-contact fatigue hypereutectoid rails, and more specifically, relates to a high-strength, high-toughness, high-abrasion-resistant, contact-fatigue-resistant heavy-duty railway Production method of hypereutectoid rail. Background technique [0002] With the increase of domestic and foreign heavy-haul railway traffic and the increase of formation density, the axle load of trains is gradually increasing, and the requirements for the strength, toughness, wear resistance and contact fatigue resistance of rails are getting higher and higher. [0003] At present, the world's major heavy-haul railways tend to use hypereutectoid rails with a hardness of more than 400HB. The strength and wear resistance basically meet the requirements for line use, but they need to be polished frequently to eliminate stripping and reduce rail damage. Further e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/18B21B1/085B22D11/00C21C7/00C21C7/072C21C7/10C21D9/04
CPCC22C33/04C21C7/072C21C7/10C21C7/0056C21C7/0006B22D11/009B21B1/085C21D9/04C22C38/02C22C38/04C22C38/18C21C7/0075C21C7/076C22C38/001C22C38/24C21C7/064C21D1/19C21D8/005C21D1/60
Inventor 袁俊邹明邓勇杨大巍
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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