High-carbon low-alloy wheel steel for locomotive of improving flexibility and wheel preparation method

A railway locomotive, low-alloy technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of safety impact, high carbon content wheel steel, high strength, high toughness, etc. The effect of improving impact toughness and good overall performance matching

Inactive Publication Date: 2014-04-23
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] From the perspective of physical quality, it is easy to obtain high strength and high hardness for high-carbon and low-alloy railway locomotive wheel steels, but it is more difficult to obtain high toughness. The mounting holes meet the needs of assembly, and the high-carbon wheel steel has high strength and high crack sensitivity. Therefore, reducing the strength of the web and improving the toughness of the web are of great significance to ensure the safety of high-carbon low-alloy steel wheels.
[0005] From a production point of view, for locomotive wheels that adopt conventional heat treatment methods, the spoke plates are in a normalized state, and their strength and toughness indicators are greatly affected by changes in ambient temperature. Especially in winter, as the ambient temperature decreases (cooling rate increases) , the strength performance of the web plate is significantly increased, and the toughness index is significantly decreased, which will definitely affect the safety of use.

Method used

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  • High-carbon low-alloy wheel steel for locomotive of improving flexibility and wheel preparation method
  • High-carbon low-alloy wheel steel for locomotive of improving flexibility and wheel preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The molten steel whose chemical composition is shown in Example 1 in Table 1 is formed through converter steelmaking process, LF furnace refining process, VD vacuum treatment process, round billet continuous casting process, ingot cutting and rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: first, austenitize at 855°C for 2.5 hours, and then spray water to cool the wheel tread, and at the same time, cover the surface of the wheel hub and web with a thickness of 20mm on one side. Protect the refractory asbestos, remove the refractory asbestos after cooling by spraying water, and reheat the wheel to 510°C for tempering treatment.

[0032] The metallographic structure of the wheel web plate prepared in this embodiment is compared with the comparative example wheel produced by the conventional process, as figure 1 and figure 2 As shown, although the microstructures are all fine pearlite...

Embodiment 2

[0035] The molten steel whose chemical composition is shown in Example 2 of Table 1 is formed through converter steelmaking process, LF furnace refining process, VD vacuum treatment process, round billet continuous casting process, ingot cutting and rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: first, after austenitizing at 860° C. for 3 hours, the wheel tread is sprayed with water to cool it, and at the same time, the surface of the wheel hub and the web is covered with 20 mm thick Protect the refractory asbestos, remove the refractory asbestos after cooling by spraying water, and reheat the wheel to 515°C for tempering treatment.

[0036] Compared with the comparative wheel produced by the conventional process, the metallographic structure of the wheel spoke plate prepared in this example is fine pearlite + a small amount of ferrite, but the ferrite content is different. The element bod...

Embodiment 3

[0039]The molten steel whose chemical composition is shown in Example 3 in Table 1 is formed through converter steelmaking process, LF furnace refining process, VD vacuum treatment process, round billet continuous casting process, ingot cutting and rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: first, austenitize at 865°C for 3.5 hours, then spray water to cool the wheel tread, and cover the surface of the wheel hub and web with a thickness of 20 mm on both sides during the water spray cooling. Protect the refractory asbestos, remove the refractory asbestos after cooling by spraying water, and reheat the wheel to 515°C for tempering treatment.

[0040] Compared with the comparative wheel produced by the conventional process, the metallographic structure of the wheel spoke plate prepared in this example is fine pearlite + a small amount of ferrite, but the ferrite content is different. The ...

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Abstract

The invention discloses a high-carbon low-alloy wheel steel for a locomotive of improving flexibility and a wheel preparation method. The high-carbon low-alloy wheel steel comprises the following chemical components in percentage by weight: 0.56-0.66 percent of C, 0.95-1.20 percent of Si, 0.95-1.20 percent of Mn, 0.30-0.40 percent of Cr, 0.015-0.030 percent of Als, not more than 0.015 percent of P, not more than 0.015 percent of S and the balance of Fe and inevitable impurities. On the premise that the performance level of a wheel rim unchangeable is kept, the impact toughness of a wheel spoke can be effectively improved, the strength of the wheel spoke is reduced, and better matching of the comprehensive performance of the wheel spoke is obtained.

Description

technical field [0001] The invention belongs to steel for railway wheels and a heat treatment method thereof, in particular to a high-carbon low-alloy wheel steel for railway locomotives with improved toughness and a wheel preparation method with uniaxial power ≥ 1200KW, axle load ≤ 25t, and running speed ≤ 120km / h . Background technique [0002] my country's existing railway mileage accounts for 6% of the world's total railway mileage, but it has completed a quarter of the world's railway workload. The railway freight volume, passenger turnover, and transportation density all rank first in the world. With the continuous increase of my country's railway freight demand, the railway freight capacity is far from meeting the requirements, which has become one of the important bottlenecks restricting the rapid development of the national economy. [0003] The urgent task of solving freight capacity is heavy-duty transportation, which is also an inevitable trend of world railway ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C21D9/34
Inventor 王世付陈刚李翔江波赵海邓荣杰鲁松蒋培华钟斌孙曼丽
Owner MAGANG (GROUP) HOLDING CO LTD
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