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Heat treatment process for wheel

A wheel and process technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve the problems that cannot meet the requirements of wheel wear resistance, section hardness, lower limit of strength, and cannot meet the requirements of high plastic toughness, etc., to achieve improved The effect of service life and safety, improving the level of hardness, ensuring wear resistance and impact resistance

Active Publication Date: 2021-06-29
MAANSHAN MAGANG JINXI RAIL TRANSPORT EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the rapid development of railway heavy-duty freight, buckling wheels must have high hardness and high strength, and their plasticity and toughness indicators should also be improved accordingly. However, the current wheel steels cannot meet the technical requirements: (1) if Micro-alloying on the basis of AAR-C grade steel can greatly improve the strength and hardness of the wheel, which can meet the surface hardness of the wheel 341-388HBW, but its impact toughness index is significantly reduced. According to the statistics of AAR-C+ steel (micro-alloy steel) performance data, its The single value of A ku5 can only reach 6J, and the elongation A is only 12.5%, which cannot meet the requirements of high plasticity and toughness at all; The average work value is 13J, and the elongation A reaches 16%, but the surface hardness is only 330HB, which cannot meet the high hardness requirements at all, and the cross-sectional hardness and strength are lower than the lower limit, which cannot meet the wear resistance requirements of the wheel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] C-grade molten steel is formed through electric furnace steelmaking process, LF furnace refining process, RH vacuum degassing process, round billet continuous casting process, ingot cutting process, hot rolling process, heat treatment process, processing, and finished product inspection process.

[0062] The heat treatment process is as follows: firstly, the rolled wheel is heated up to 860-880°C with the furnace and kept for 3 hours, and then it is quenched out of the furnace. The quenching time of the wheel tread is 400s, and the water pressure is 0.10MPa; the quenching time of the outer rim surface of the wheel is 260s, and the water pressure is 0.30MPa; image 3 shown), accelerate the cooling of the metal inside the rim to below 500°C, and finally temper in a furnace at 470±10°C for 5 hours, then take it out of the furnace and cool it to room temperature in air.

[0063] Such as Figure 5 As shown, the metallographic structure of the wheel rim prepared in Example 1...

Embodiment 2

[0066] C-grade molten steel is formed through electric furnace steelmaking process, LF furnace refining process, RH vacuum degassing process, round billet continuous casting process, ingot cutting process, hot rolling process, heat treatment process, processing, and finished product inspection process.

[0067]The heat treatment process is as follows: firstly, the wheel is heated to 860-880° C. with the furnace and kept for 3 hours, and then it is quenched out of the furnace. The quenching time of the wheel tread surface is 400s, and the water pressure is 0.10MPa; the quenching time of the outer and inner rim surface of the wheel is 260s, and the water pressure is 0.30MPa; Figure 4 As shown), the metal inside the rim is accelerated to cool down to below 500°C, and finally tempered at 470±10°C for 5 hours, then it is taken out of the furnace and air-cooled to room temperature.

[0068] Such as Figure 6 As shown, the metallographic structure of the wheel rim prepared in Examp...

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Abstract

The invention discloses a heat treatment process for a heavy-load wheel. The heat treatment process comprises the steps of: a, heating a rolled wheel; b, quenching the wheel; and c, tempering and cooling the wheel. In the heat treatment process for the heavy-load wheel, a quench cooling device used for quench cooling of the wheel is included, the quench cooling device comprises a carrier roller platform for supporting the wheel, nozzles for carrying out quench cooling on a wheel tread and a wheel rim surface, and a cooling mechanism for quench cooling of the nozzles; the wheel is placed on the carrier roller platform; the nozzles are evenly distributed in the circumferential direction of the carrier roller platform and connected with the cooling mechanism; carrier rollers rotate to drive the wheel to rotate; and quench cooling liquid is evenly sprayed on the wheel tread and the wheel rim surface. According to the quench cooling mode and the heat treatment process for the wheel, on the premise that the microstructure of conventional high-carbon steel AAR-C is still kept to be fine pearlite and a small amount of ferrite, the wheel has high hardness, high toughness and high plasticity at the same time, and the wear resistance and safety of the heavy-load wheel with the axle load of 40 tons are met.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of wheels for railway vehicles, and in particular relates to a wheel heat treatment process. Background technique [0002] In recent years, the world's railway freight has developed rapidly in the direction of heavy haul. Increasing the axle load is the most effective measure to reduce operating costs and increase transport capacity of heavy haul trains, and it will be the trend of heavy haul railway transportation in various countries in the world in the future. Heavy-duty transportation is very common in Australia and other countries where mineral freight is the mainstay. The axle load of heavy-duty railway trains has generally reached more than 35t, and the requirements for wheel wear resistance and contact fatigue resistance are getting higher and higher. Mainly use high-strength, high-hardness carbon steel, that is, C-grade steel (0.67%-0.77%) in the North American AAR M-107 standard (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/34C21D1/18C21D1/667C21D11/00
CPCC21D9/34C21D1/18C21D1/667C21D11/00Y02P10/20
Inventor 庞晋龙陈刚邓荣杰张磊国新春
Owner MAANSHAN MAGANG JINXI RAIL TRANSPORT EQUIP
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