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Medium-carbon low-alloy wheel steel for metro and manufacturing method of wheel steel

A manufacturing method and low-alloy technology, applied to wheels, wheels characterized by rail running parts, vehicle parts, etc., can solve the problems of unfavorable wheel safety, wheel plasticity, toughness damage, etc., to increase difficulty and improve durability The effect of increasing the grinding performance and hardness

Active Publication Date: 2014-09-03
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method is to increase the content of C element to improve the hardness index of the wheel, but it will damage the plasticity and toughness of the wheel, which is not good for the safety of the wheel.

Method used

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  • Medium-carbon low-alloy wheel steel for metro and manufacturing method of wheel steel
  • Medium-carbon low-alloy wheel steel for metro and manufacturing method of wheel steel
  • Medium-carbon low-alloy wheel steel for metro and manufacturing method of wheel steel

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 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: heating to 845°C for 2 hours, cooling the rim with water spray (cooling to below 550°C), and then tempering at 510°C for 5 hours.

[0039] As shown in FIG. 1 , the metallographic structure of the wheel rim prepared in this embodiment is fine pearlite + a small amount of ferrite. The mechanical properties of the rim of the wheel in this embodiment are shown in Table 2 and Figure 2. Compared with the ER8 and ER9 wheels, the rim toughness remains basically unchanged, and the strength and hardness are significantly improved compared with the ER8 and ER9 wheels.

[0040] At the same time, the dyn...

Embodiment 2

[0043]The molten steel whose chemical composition is shown in Example 2 of 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: heating to 850°C for 2.5 hours, cooling the rim with water spray (cooling to below 550°C), and then tempering at 515°C for 4.5 hours.

[0044] As shown in FIG. 1 , the metallographic structure of the wheel rim prepared in this embodiment is fine pearlite + a small amount of ferrite. The mechanical properties of the wheel in this embodiment are shown in Table 2 and Figure 2. Compared with the ER8 and ER9 wheels, the toughness of the rim remains basically unchanged, and the strength and hardness are significantly improved compared with the ER8 and ER9 wheels.

[0045] At the same time, the dyna...

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Abstract

The invention relates to medium-carbon low-alloy wheel steel for metro and a manufacturing method of the wheel steel. The medium-carbon low-alloy wheel steel is composed of the following chemical components in percentage by weight: 0.50-0.60% of C, 0.80-1.20% of Si, 0.90-1.10% of Mn, 0.15-0.35% of Cr, 0.010-0.030% of Als, less than or equal to 0.015% of P, less than or equal to 0.015% of S and the balance of Fe and inevitable impurity elements. The manufacturing method comprises an electric furnace smelting step, an ingot slicing and rolling step and a thermal treatment step. A wheel manufactured by use of the wheel steel is obviously improved in strength and hardness while the tenacity of the rim of the wheel basically keeps unchanged; the wear-resisting property of the wheel is effectively improved, and the probability of stripping and abrasion of the wheel in the use process is reduced. Meanwhile, the wheel manufactured by use of the wheel steel is capable of keeping the ferrite-pearlite structure state of the previous wheel without increasing the wheel manufacturing difficult.

Description

technical field [0001] The invention relates to the field of metallurgical industrial production, in particular to a medium-carbon low-alloy subway wheel steel and a manufacturing method thereof, in particular to a subway wheel requiring high hardness and a preparation method thereof. Background technique [0002] With the continuous acceleration of my country's urbanization process, the subway, as a convenient and environmentally friendly means of transportation, has developed rapidly in major cities across the country. However, with the increase of passenger capacity and transportation speed, ordinary ER8 and ER9 wheels used in subways have problems such as tread peeling and serious wear due to their low hardness during use. This will not only increase the frequency of vehicle inspections and maintenance costs, but also Affect riding comfort, and even affect driving safety. It can be seen that in order to improve the service performance of the subway wheels, the hardness ...

Claims

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Application Information

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IPC IPC(8): C22C38/18B60B17/00
Inventor 江波赵海陈刚钟斌李翔鲁松邹强孙曼丽
Owner MAGANG (GROUP) HOLDING CO LTD
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