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High-carbon and low-alloy wheel steel for railway wagon and manufacturing method of wheel

A railway wagon and low-alloy technology, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve problems such as the deterioration of wheel use conditions, and achieve the effects of improving service life, reducing wear, and increasing difficulty

Inactive Publication Date: 2014-04-09
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to adapt to the development of 30t axle load heavy-duty freight technology, the conventional CL70 material truck wheel has been successfully developed in China and has successfully passed the relevant certification. Its service performance is obviously better than the existing CL60 material truck wheel. It is foreseeable that the increase will further deteriorate the service conditions of the wheels. Therefore, to prepare for the future 35t or even 40t axle load and heavy-duty technology, it is extremely necessary to develop heavy-duty wheel materials with higher hardness levels, while taking into account the basic maintenance of the plastic index. On the premise of stability, further improve the strength and hardness of the wheels to further improve the wear resistance of the wheels so that they can better meet the needs of 35t or even 40t axle loads

Method used

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  • High-carbon and low-alloy wheel steel for railway wagon and manufacturing method of wheel
  • High-carbon and low-alloy wheel steel for railway wagon and manufacturing method of wheel
  • High-carbon and low-alloy wheel steel for railway wagon and manufacturing method of wheel

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Embodiment 1

[0028] The molten steel whose chemical composition is shown in Example 1 in Table 1 is formed through electric furnace steelmaking process, LF furnace refining process, RH 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 holding the heat at 855°C for 2.0 hours, air cooling to about 20°C, then holding at 845°C for 2.0 hours, spraying water to cool the rim to 510°C, so that the metal inside the rim is cooled at a rate of 4°C / s Accelerated cooling and finally tempering at 510°C for 4.5 hours.

[0029] like figure 1 , 2 As shown, the metallographic structure of the wheel rim prepared in this example is basically the same as that of the conventional CL70 steel wheel, both of which are fine pearlite + a small amount of ferrite. The mechanical properties of the wheel of this embodiment are shown in T...

Embodiment 2

[0033] The molten steel whose chemical composition is shown in Example 2 in Table 1 is formed through electric furnace steelmaking process, LF furnace refining process, RH 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 holding at 845°C for 2.0 hours, air cooling to room temperature of about 25°C, then holding at 835°C for 2.5 hours, spraying water to cool the rim to 500°C, and accelerating the cooling of the metal inside the rim at a cooling rate of 3°C / s , and finally tempered at 500 ° C for 5.0 hours.

[0034] like figure 1 , 2 As shown, the metallographic structure of the wheel rim prepared in this example is basically the same as that of the conventional CL70 steel wheel, both of which are fine pearlite + a small amount of ferrite. The mechanical properties of the wheel of this embodimen...

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Abstract

The invention discloses high-carbon and low-alloy wheel steel for a railway wagon. The high-carbon and low-alloy wheel steel comprises the following chemical ingredients by weight percent: 0.72-0.77% of C, 0.90-1.1% of Si, 0.85-0.95% of Mn, 0.03-0.05% of Mo, 0.30-0.40% of Cr, 0.010-0.025% of Als, no more than 0.015% of P, no more than 0.015% of S, and the balance of Fe and inevitable impurity elements. The invention also discloses a manufacturing method of the wheel. The method comprises a thermal treatment procedure which comprises the following steps: carrying out heat preservation at 840-860 DEG C for 2.0-2.5 hours, and then air-cooling to room temperature; carrying out heat preservation at 830-850 DEG C for 2.0-2.5 hours; spraying water to cool a rim to below 550 DEG C; cooling internal metal inside the rim at the cooling speed of 2-5 DEG C / s in an acceleration manner; and finally, carrying out tempering treatment at 500-520 DEG C for 4.5-5.0 hours.

Description

technical field [0001] The invention belongs to steel for railway wheels and a heat treatment method thereof, in particular to high-hardness, high-strength, high-plasticity high-carbon low-alloy wheel steel for railway wagons with axle load ≥ 40t and running speed ≤ 100km / h and a wheel preparation method. 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 rapid expansion of our country's economy, the demand for railway freight continues to increase, and the capacity of railway freight is far from meeting the requirements, which has become one of the important bottlenecks restricting the rapid development of the national economy. [0003] Under the current railway resource conditions, the urgent task of solving the freight capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C21D9/34
Inventor 陈刚王世付李翔江波赵海邓荣杰钟斌孙曼丽
Owner MAGANG (GROUP) HOLDING CO LTD
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