Wheel steel and heat treatment method and application thereof

A heat treatment method and wheel steel technology, which is applied in the field of rolling steel wheels for railway vehicles, can solve the problem of reducing the safety performance of medium and high carbon steel wheels, reducing the crack growth resistance inside the wheel, and the average value of the impact toughness of the web plate, etc. problems, to achieve the effect of promoting the refinement of pearlite sheets, improving the safety performance of the wheel, and good comprehensive mechanical properties

Inactive Publication Date: 2015-07-08
MAGANG (GROUP) HOLDING CO LTD +1
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Problems solved by technology

[0004] For CL65 steel wheels whose C content is in the range of medium and high carbon steel, the new railway industry standard requires that the microstructure of the wheel rim should be fine pearlite and a small amount of ferrite after quenching and tempering treatment. The notable feature is that the increase in hardness will lead to a decrease in impact toughness, thereby reducing the internal crack growth resistance of the wheel. When the wheel is subjected to complex wheel-rail interaction forces during service, it will have a negative impact on the safety perform

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  • Wheel steel and heat treatment method and application thereof
  • Wheel steel and heat treatment method and application thereof
  • Wheel steel and heat treatment method and application thereof

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[0029] Example 1:

[0030] The molten steel with the chemical composition 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 rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: after the furnace is heated to 854°C for 2.6 hours, the rim is sprayed with water to cool (accelerate the cooling of the metal inside the rim to below 550°C at a cooling rate of 2°C / s to 5°C / s). When the temperature in the middle of the plate drops to 790°C, air-cool the spokes (accelerate the cooling of the metal inside the spokes to below 732°C at a cooling rate of 4°C / s to 7°C / s), then air cool, and finally heat to Tempering at 497°C, holding time 4 hours 30 minutes.

[0031] Such as figure 1 , 2 As shown, the microstructure of the wheel web prepared in this example is flaky pearlite ...

Example Embodiment

[0034] Example 2:

[0035] The molten steel with the chemical composition shown in Table 1 and Example 2 is formed through electric furnace steelmaking process, LF furnace refining process, RH vacuum treatment process, round billet continuous casting process, ingot rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: the molten steel with the chemical composition shown in Table 1 and Example 2 is passed through the electric furnace steelmaking process, LF furnace refining process, RH vacuum treatment process, round billet continuous casting process, ingot rolling process, heat treatment process, and processing , The finished product inspection process is formed. The heat treatment process is: after the furnace is heated to 868°C for 2.8 hours, the rim is sprayed with water to cool (accelerate the cooling of the metal inside the rim to below 550°C at a cooling rate of 2°C / s to 5°C / s). When the temp...

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Abstract

The invention relates to wheel steel and a heat treatment method and application thereof. The wheel steel comprises, by weight, 0.57-0.67% of C, not larger than 1.00% of Si, not larger than 1.20% of Mn, not larger than 0.025% of P, not larger than 0.025% of S, and the balance Fe and unavoidable impurity elements. The wheel steel is used for manufacturing wagon wheels. The heat treatment method comprises the following steps that firstly, the temperature of the wheels is increased to 850 DEG C to 870 DEG C along with the temperature of a furnace; secondly, heat preservation is conducted; thirdly, spray cooling is conducted on rims; fourthly, when the temperature of the middle portions of wheel disks is reduced to 730 DEG C to 740 DEG C, air cooling is conducted on the wheel disks; fifthly, air cooling is conducted; sixthly, heating, tempering and heat preserving are conducted. On the basis that the strength of the wagon wheels subjected to heat treatment and containing 0.57-0.67% of carbon goes near to that of a common medium and high carbon steel wheels, the impact property of the wheel disks is remarkably improved, and therefore the good comprehensive mechanical property is obtained, and the use safety performance of the wheels is improved.

Description

technical field [0001] The invention relates to the field of manufacturing rolling steel wheels for railway vehicles, in particular to a heat treatment method for steel rolling integral wheels for railway freight vehicles with an axle load of 25t to 30t and a running speed of ≤120km / h. Background technique [0002] my country's current railway freight vehicle wheel standard is the railway industry standard TB / T2817-1997 "Technical Conditions for Rolled Steel Integral Wheels for Railway Vehicles" promulgated in 1997, which is mainly applicable to railway freight vehicle wheels with a running speed of not less than 120km / h . The C content requirement of conventional CL60 steel in this standard is 0.55-0.65%, which has not changed for decades. In recent years, traditional wheel steels have been exposed to a large number of problems under heavy load and speed-up conditions, including severe wear and edge rolling, increased wheel peeling and block loss, and sharply shortened whee...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C38/04C21D9/34C21D8/00
Inventor 孙曼丽江波陈刚方金凤钟斌邹强赵海宫彦华李翔
Owner MAGANG (GROUP) HOLDING CO LTD
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