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Heat treatment method of high-carbon steel heavy-duty railway wheels and small wheel specimen heat treatment method simulating same

A heat treatment method and small sample technology, applied in the field of iron and steel, can solve problems such as the inability to simulate the cooling conditions inside the rim

Inactive Publication Date: 2018-09-25
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this puts greater pressure on the increasing new product development
[0003] In the process of product development, the heat treatment process has a significant impact on the microstructure and performance of the wheel. In industrial production, the volume of the wheel is relatively large, and the quenching of the rim is carried out by spraying water on the tread of the wheel. Due to the comparison of the volume of the physical wheel Large, the cooling rate of the rim gradually decreases from the tread to the inside, which is very different from the water cooling of the small sample after heating. Therefore, water cooling of the small sample of the wheel after heating under laboratory conditions cannot simulate the rim of the industrial production wheel heat treatment process. internal cooling condition

Method used

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  • Heat treatment method of high-carbon steel heavy-duty railway wheels and small wheel specimen heat treatment method simulating same
  • Heat treatment method of high-carbon steel heavy-duty railway wheels and small wheel specimen heat treatment method simulating same
  • Heat treatment method of high-carbon steel heavy-duty railway wheels and small wheel specimen heat treatment method simulating same

Examples

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Effect test

Embodiment 1

[0025] A heat treatment method for high-carbon steel heavy-duty road wheels, the chemical composition and weight percentage of the high-carbon steel heavy-duty road wheels are shown in Table 1, and the heat treatment method includes the following steps: heating the wheels at 850-870°C 2.5~3h, then water-cooled and quenched under 0.32±0.03MPa water pressure for 300s, then tempered at 470~490℃ for more than 4h, and then air-cooled. The wheel is obtained by smelting in an electric furnace, LF+RH refining, vacuum degassing, continuous casting into a round billet of Φ380 mm, and the round billet is cut into ingots, heated and rolled to form a wheel with a diameter of 950 mm.

[0026] A heat treatment method for a small sample of a laboratory wheel that simulates the above heat treatment method, comprising the following steps: taking a small sample of Φ25mm from any part of the wheel obtained by the same method as above, and heating it to 860°C for 0.5 hours with the furnace , quenc...

Embodiment 2

[0036] A heat treatment method for high-carbon steel heavy-duty road wheels, the chemical composition and weight percentage of the high-carbon steel heavy-duty road wheels are shown in Table 1, and the heat treatment method includes the following steps: heating the wheels at 850-870°C 2.5~3h, then water-cooled and quenched under 0.32±0.03MPa water pressure for 300s, then tempered at 470~490℃ for more than 4h, and then air-cooled. The wheel is obtained by smelting in an electric furnace, LF+RH refining, vacuum degassing, continuous casting into a round billet of Φ380 mm, and the round billet is cut into ingots, heated and rolled to form a wheel with a diameter of 950 mm.

[0037] A heat treatment method for a small sample of a laboratory wheel that simulates the above heat treatment method, comprising the following steps: taking a small sample of Φ25mm from any part of the wheel obtained by the same method as above, and heating it to 860°C for 0.5 hours with the furnace , quenc...

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Abstract

The invention provides a heat treatment method of high-carbon steel heavy-duty railway wheels and a small wheel specimen heat treatment method simulating same. The heat treatment process in the process of industrial production is simulated by the following heat treatment process: a small specimen which is 25mm in diameter is taken from any part of a wheel, the small specimen is heated to 860 DEG Calong with a furnace, kept at the temperature for 0.5 hour, hardened by oil and then air-cooled, and finally, the small specimen is heated to 480 DEG C again, tempered and kept at the temperature for2 hours. The internal cooling condition of rims in the process of heat treatment on industrially produced wheels is effectively simulated under laboratory conditions, and the method can help reduce the cost of development, reduce the number of industrial experiments on a new product and shorten the period of new product development.

Description

technical field [0001] The invention belongs to the technical field of iron and steel, and in particular relates to a heat treatment method for high-carbon steel road heavy-duty wheels and a small wheel sample heat treatment method simulating the method. Background technique [0002] With the vigorous development of rail transit industry at home and abroad, the wheel manufacturing industry is becoming more and more prosperous, and there are more and more types of wheel products, such as high-speed wheels, heavy-duty wheels, high-power locomotive wheels, elastic wheels, etc. However, this puts greater pressure on the increasing new product development. [0003] In the process of product development, the heat treatment process has a significant impact on the microstructure and performance of the wheel. In industrial production, the volume of the wheel is relatively large, and the quenching of the rim is carried out by spraying water on the tread of the wheel. Due to the compar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/34C21D1/18C22C38/02C22C38/04C22C38/12G01N1/44
CPCC21D9/34C21D1/18C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/12G01N1/44
Inventor 王长乐江波陈刚赵海陈讲彪邹强宫彦华陈灵通童乐
Owner MAANSHAN IRON & STEEL CO LTD
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