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Medium-carbon wheel steel and heat treatment method thereof as well as preparation method of wheel

A heat treatment method and wheel steel technology, applied in heat treatment equipment, heat treatment furnaces, manufacturing tools, etc., can solve problems affecting the running quality and safety of wheels, abnormal wear of wheels, cracks, etc., so as to improve the anti-rolling contact fatigue performance and improve running Quality and safety, and the effect of improving the strength of the rim

Inactive Publication Date: 2019-09-27
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Running in such an unfavorable environment, many problems have appeared on the subway wheel treads, such as abnormal wear of the wheels, cracks and damage caused by wheel-rail rolling contact fatigue, etc., which directly affect the running quality and safety of the wheels.

Method used

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  • Medium-carbon wheel steel and heat treatment method thereof as well as preparation method of wheel
  • Medium-carbon wheel steel and heat treatment method thereof as well as preparation method of wheel
  • Medium-carbon wheel steel and heat treatment method thereof as well as preparation method of wheel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 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 hot rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: first, heat the wheel with the furnace to 850-870°C for 2.5 hours, and then spray water on the rim to cool the metal inside the rim to 500°C at a cooling rate of 2°C / s-5°C / s. ℃, and finally tempered at 480 ℃ for 4.0 hours.

[0031] Such as figure 1 , 4 As shown, the metallographic structure of the wheel rim prepared in this example is basically the same as that of the ER7 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 Table 2 and Table 3, and the anti-rolling contact fatigue performance is sho...

Embodiment 2

[0034] 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 hot rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: first, heat the wheel to 850-870°C with the furnace and keep it warm for 2.5-3.0 hours, then spray water on the rim to cool the metal inside the rim at a cooling rate of 2°C / s-5°C / s Below 500°C, finally temper at 480±10°C for 4.0-5.0 hours.

[0035] Such as figure 2 , 4As shown, the metallographic structure of the wheel rim prepared in this example is basically the same as that of the ER7 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 Table 2 and Table 3, and the anti-rolling contact fatigue ...

Embodiment 3

[0038] The molten steel whose chemical composition is shown in Example 3 in Table 1 is formed through the electric furnace steelmaking process, LF furnace refining process, RH vacuum treatment process, round billet continuous casting process, ingot cutting hot rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: first, heat the wheel with the furnace to 870-890°C for 3.0 hours, and then spray water on the rim to cool the metal inside the rim to 500°C at a cooling rate of 2°C / s-5°C / s. ℃, and finally tempered at 480 ℃ for 4.5 hours.

[0039] Such as image 3 , 4 As shown, the metallographic structure of the wheel rim prepared in this example is basically the same as that of the ER7 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 Table 2 and Table 3. It can be seen from Table 2 that the rim impact per...

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Abstract

The invention discloses a medium-carbon wheel steel and a heat treatment method thereof as well as a preparation method of a wheel. The medium-carbon wheel steel comprises the following chemical components: by weight, 0.48-0.52% of C, 0.20-0.40% of Si, 0.60-0.80% of Mn, <= 0.020% of P, <= 0.015% of S, 0.09-0.12% of Mo, 0.15-0.30% of Cr, and the remainder comprising Fe and inevitable impurity elements. Compared with the traditional ER7 wheel steel, the medium-carbon wheel steel of the invention can significantly improve the strength of a wheel rim, on the premise that the toughness of the wheel rim of a wheel made from the traditional ER7 wheel steel is basically equivalent to the toughness of the wheel rim of a wheel made from the medium-carbon wheel steel; and thus effectively improves the capacity of resistance to rolling contact fatigue, reduces the occurrence probability of out of circularity, and improves the running quality and safety of a vehicle.

Description

technical field [0001] The invention belongs to the field of manufacturing rail transit wheels, and relates to a medium-carbon wheel steel, a heat treatment method thereof, and a preparation method for a wheel, in particular to a medium-carbon wheel steel with a running speed below 160 km / h, a heat treatment method thereof, and a wheel production method Preparation. Background technique [0002] The subway is one of the indispensable means of transportation in many big cities in the world. It is an independent rail transit system. Its normal operation is not affected by the congestion of the ground roads, and it can transport passengers quickly, safely and comfortably. Subway (or rail transit) is the mainstream and direction of modern urban traffic. It has large capacity, fast speed, little interference and low energy consumption. It is known as the main artery of modern cities and is the most effective way to solve the traffic tension in big cities. Way. Subway has assume...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C21D1/18C21D6/00C21D9/34
CPCC21D1/18C21D6/002C21D6/005C21D6/008C21D9/34C22C38/002C22C38/02C22C38/04C22C38/22
Inventor 万志健丛韬赵海陈刚邹强宫彦华姚三成高伟
Owner MAANSHAN IRON & STEEL CO LTD
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