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Low-alarm-rate high-purity turnout steel rail and preparation method thereof

A technology with high alarm rate and purity, applied in the field of low alarm rate and high purity turnout rail and its preparation, can solve the problems of low alarm rate and high purity, achieve low alarm rate, increase dispersion degree, and excellent contact fatigue resistance

Inactive Publication Date: 2021-02-09
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the existing rolled ordinary carbon turnout rails are difficult to meet the development needs of heavy-duty lines at home and abroad, and there is an urgent need for a turnout rail with low alarm rate and high purity and its preparation method

Method used

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  • Low-alarm-rate high-purity turnout steel rail and preparation method thereof
  • Low-alarm-rate high-purity turnout steel rail and preparation method thereof
  • Low-alarm-rate high-purity turnout steel rail and preparation method thereof

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preparation example Construction

[0020] Specifically, the invention provides a method for preparing turnout rails with low alarm rate and high purity. The method comprises the following steps: using molten iron with an S content of 0.008-0.012% for converter smelting, and feeding calcium-sulfur ratio during the smelting process is 8.0×10 6 ~10.0×10 6 (length m / S% content) of the calcium wire, control the ratio of hydrogen content to sulfur content H (ppm) / S (wt%) <400, through a small platform, LF refining, RH vacuum treatment, the whole process of protection cast steel billet, The casting temperature is 1490-1515°C, and the casting speed is 0.6-0.8m / min. The cast billet enters the slow cooling pit for slow cooling, and the cooling speed is 0.3-0.5°C / min. The cooled billet is homogenized with austenite , the homogenization temperature is 1000℃~1300℃, and the time is 200~500min, fully complete the diffusion process of organization and texture, homogenize the organization, and fully diffuse the inclusions. ...

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Abstract

The invention belongs to the technical field of turnout steel rail production, and particularly relates to a low-alarm-rate high-purity turnout steel rail and a preparation method thereof. The low-alarm-rate high-purity turnout steel rail and the preparation method thereof aim to achieve the technical effects of being low in alarm rate and high in purity. The method comprises the following steps of sequentially carrying out converter smelting, small platform treatment, LF refining, RH vacuum treatment, casting to obtain a steel billet, slow cooling in a slow cooling pit, austenite homogenization and rolling on molten iron entering a furnace; and a calcium wire is fed in the converter smelting process. The prepared steel rail comprises the following chemical components of, by weight, 0.70%-0.82% of C, 0.1%-0.6% of Si, 0.6%-1.3% of Mn, less than or equal to 0.010% of P, less than or equal to 0.010% of S, less than or equal to 0.20% of Cr and the balance Fe and inevitable impurities. By means of the method, the alarm rate of the manufactured turnout steel rail is smaller than or equal to 0.5%, the purity is high, the toughness is higher, the contact fatigue resistance is better, and the good abrasion resistance is achieved.

Description

technical field [0001] The invention belongs to the technical field of turnout rail production, and in particular relates to a turnout rail with low alarm rate and high purity and a preparation method thereof. Background technique [0002] With the improvement of domestic and foreign railway speeds and the increase of freight volume, it is particularly important to use steel rails for turnouts as the weak link of railways. Turnout rail is an important device connecting railways and crossings, and its function is to guide trains from one track to another. During the transition process of fast trains or heavy-duty trains, the turnout rails have to bear huge external forces. Therefore, the service life of turnouts is as short as 1 to 2 months, and as long as 1 to 2 years. Frequent track replacement brings about reduced transportation efficiency, increased costs, and also brings safety hazards to driving. [0003] Turnout rails, especially the switch rails, are usually machine...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/18C21C7/00C21C7/072C21C7/10
CPCC22C33/04C22C38/02C22C38/04C22C38/18C21C7/10C21C7/072C21C7/0056
Inventor 袁俊邹明邓勇李若曦
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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