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Steel for subway wheels and wheel production method

A production method and wheel technology, applied in furnace types, furnaces, heat treatment furnaces, etc., can solve problems such as the reduction of toughness indicators and the risk of affecting vehicle operation

Active Publication Date: 2021-02-05
MAANSHAN MAGANG JINXI RAIL TRANSPORT EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase in strength and hardness will inevitably lead to a decrease in toughness indicators, which will affect the risk of vehicle operation.
[0004]Through decades of research, the comprehensive performance of carbon steel wheels has basically reached the limit level, and it is difficult to further improve through the optimization of heat treatment process

Method used

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  • Steel for subway wheels and wheel production method
  • Steel for subway wheels and wheel production method
  • Steel for subway wheels and wheel production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1- Embodiment 3

[0040] A steel for subway wheels, including the following mass percentage elements: as shown in Table 1, the balance not listed in Table 1 is Fe and unavoidable impurities.

Embodiment 1

[0048] Example 1 The steel used for subway wheels is used to produce wheels. The heat treatment process is as follows: first, after holding the heat for 2.5 hours at 850°C, the rim is sprayed with water to cool the metal inside the rim to 530°C at a cooling rate of 1°C / s-4°C / s. Next, temper at 500°C for 4.5 hours at last, and use the same heat treatment process for Comparative Example 1 and Comparative Example 2. The wheel rim prepared in this embodiment is pearlite+ferrite (see Figure 1-Figure 3 ), the structure of Example 1 is pearlite+ferrite 2.4%; the structure of Comparative Example 1 is pearlite+ferrite 6.7%, and the structure of Comparative Example 2 is pearlite+ferrite 5.9%.

[0049] The steels of the composition of Comparative Example 1 and Comparative Example 2 were treated according to the above-mentioned heat treatment method of Example 1.

[0050] The mechanical properties of the wheel of this embodiment are shown in Table 2, and its toughness, strength and hard...

Embodiment 2

[0052] Example 2 The steel used for subway wheels is used to produce wheels. The heat treatment process is as follows: first, after holding the heat for 2.5 hours at 842°C, the rim is sprayed with water to cool the metal inside the rim to 530°C at a cooling rate of 1°C-4°C / s. In the following, the final tempering treatment was performed at 480° C. for 5.0 hours, and the same heat treatment process was adopted for Comparative Example 1 and Comparative Example 2.

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Abstract

The invention provides steel for subway wheels and a wheel production method. The steel comprises the following components of, in percentage by mass, 0.60%-0.64% of C, 0.20%-0.37% of Si, 0.60%-0.80% of Mn, P less than or equal to 0.015%, S less than or equal to 0.015%, 0.10%-0.15% of Cr, 0.10%-0.20% of Ni, 0.01%-0.03% of Al, 0.05%-0.15% of V, 50ppm-90ppm of N and the balance Fe and inevitable impurity elements. According to the steel for the subway wheels and the wheel production method, the use amount ratio of design elements is optimized and electric furnace steelmaking, blank hot forming rhythm and heat treatment are controlled, so that the wheel performance is improved; and compared with traditional CL60 wheel steel, on the premise that the toughness level of a rim is basically equal,the strength and toughness of the wheel rim can be remarkably improved, so that the rolling contact fatigue resistance is effectively improved, the probability of out-of-round and stripping is reduced, and the running quality and safety of a vehicle are improved.

Description

technical field [0001] The invention belongs to the technical field of railway wheel preparation, and in particular relates to a steel for subway wheels and a production method for the wheels. Background technique [0002] The steel used for subway wheels around the world is mainly made of ER8 and ER9 materials in the EN13262 standard. However, in recent years, subway companies have reported that the tread wear of the wheels is relatively large, which affects the service life of the wheels. Therefore, some cities in my country use CL60 materials with higher hardness. In order to improve the wear resistance of the wheel, thereby increasing the service life of the wheel. Through investigation, it is found that CL60 subway wheels also have problems such as serious out-of-roundness and frequent peeling. The main reason is that the frequent braking of subway vehicles causes large changes in the contact stress between the wheel and rail, which easily leads to the initiation of mic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/46C22C33/04C21D9/34C21D6/00
CPCC22C38/02C22C38/04C22C38/06C22C38/46C22C38/001C22C33/04C21D9/34C21D6/004C21D6/005C21D6/008Y02P10/20
Inventor 国新春陈刚肖峰张磊邓荣杰宁珅程德利王健王志刚吴争
Owner MAANSHAN MAGANG JINXI RAIL TRANSPORT EQUIP
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