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Wheel with hardness grade of 360 HB or above for heavy-duty truck and heat treatment method and production method of wheel

A technology of 360HB, heat treatment method, applied in the field of heavy-duty truck wheels and their heat treatment, can solve the problems of low yield, increased production cost, coarse austenite grains, etc.

Active Publication Date: 2022-06-21
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, from the aspect of heat treatment, the carbon content is increased, and it is generally heated at 30-50°C above the AC3 transformation point temperature. It is easy to obtain higher hardness when cooling, but high carbon steel is prone to Austrian steel when the heating temperature is high. Coarse celite grains lead to reduced plasticity and toughness
[0004] For wheels with a hardness ≥ 340HB, the carbon content is generally controlled at 0.70-0.72wt% at present, and the hardenability is improved by adding Cr and Mo elements to increase the hardness. The deepest tissue can reach 15mm, if it cannot be completely turned off in the subsequent machining process, it will affect the service performance and safety of the wheel
Therefore, general wheel manufacturers increase the processing allowance, which will lead to low yield and increased production cost.

Method used

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  • Wheel with hardness grade of 360 HB or above for heavy-duty truck and heat treatment method and production method of wheel
  • Wheel with hardness grade of 360 HB or above for heavy-duty truck and heat treatment method and production method of wheel
  • Wheel with hardness grade of 360 HB or above for heavy-duty truck and heat treatment method and production method of wheel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The chemical composition weight percentages of the wheel steels in Example 1 and Example 2 are shown in Table 1. Both Example 1 and Example 2 were smelted in a 100-ton ultra-high-power electric arc furnace and directly connected after LF+RH refining and vacuum degassing. forging The round billet is cut into ingot, heated and rolled, and heat treated to form a wheel with a diameter of 760mm.

[0047] Example 1

[0048] The molten steel whose chemical composition is shown in Table 1, Example 1, is formed through the electric furnace steelmaking process, the LF furnace refining process, the RH vacuum treatment process, the round billet continuous casting process, the ingot rolling process, the heat treatment process, the processing, and the finished product inspection process. The ingot cutting and rolling process is as follows: the billet is cut into a steel ingot weighing 380kg per piece, heated to 1200° C. for 4 hours, and after the heating is completed, forging prefo...

Embodiment 2

[0052] The molten steel whose chemical composition is shown in Table 1 and Example 2 is formed through the electric furnace steelmaking process, the LF furnace refining process, the RH vacuum treatment process, the round billet continuous casting process, the ingot rolling process, the heat treatment process, the processing, and the finished product inspection process. The ingot cutting and rolling process is as follows: the billet is cut into a steel ingot weighing 380kg per piece, heated to 1200° C. for 4 hours, and after the heating is completed, forging preforming is performed in a 5,000-ton hydraulic press, and then rolled into a 760mm diameter. Wheel; the heat treatment process is as follows: first, after keeping the temperature at 860°C for 2.5 hours, the rim is cooled by spraying water, so that the surface metal of the rim tread is heated to 5°C / s-8°C / s, and the inner metal is heated to 2°C / s-5°C / s. The cooling rate is below 500 °C, and finally tempered at 490 °C for 5....

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Abstract

The invention discloses a wheel with the hardness grade of 360 HB or above for a heavy-duty truck and a heat treatment method and a production method of the wheel. The wheel for the heavy-duty truck comprises the following chemical components in percentage by weight: 0.75-0.78% of C, 0.20-0.40% of Si, 0.50-0.70% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.22-0.24% of Ni, 0.03-0.07% of Nb, 50-80 ppm of N and the balance of Fe and inevitable impurities. According to the high-carbon steel wheel, the toughness and plasticity are not reduced while the hardness is improved, and compared with a high-carbon steel wheel with the C content of 0.70-0.75%, the hardness of the wheel can be improved by 5-8% and can stably reach 360 HB or above, and the wear resistance is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of railway wheel preparation, and in particular relates to a wheel for heavy-duty trucks with a hardness level above 360HB and a heat treatment method and production method thereof. Background technique [0002] Railway freight is developing in the direction of heavy load. Increasing the axle load is one of the most effective means to improve freight. In developed countries, such as Australia, the axle load of trucks has experienced the development of 30t→35t→40t→45t. The hardness has also developed from ≥300HB, through ≥320HB, to ≥340HB, and the wear problem in the service process of the wheel is alleviated by increasing the hardness. [0003] The material of railway wheels is carbon steel, which allows adjustment of trace alloying elements to improve the overall performance. The microstructure is pearlite + a small amount of ferrite. The wheels for trucks are generally high carbon steel with a carbon conte...

Claims

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Application Information

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IPC IPC(8): C21D1/25C21D8/00C21D9/34C22C38/02C22C38/04C22C38/08C22C38/12C22C33/04
CPCC22C38/02C22C38/04C22C38/08C22C38/12C22C38/001C21D9/34C21D1/25C21D8/005C22C33/04C21D2211/009C21D2211/005Y02T10/86
Inventor 赵海邹强刘学华宫彦华万志健姚三成高伟钟斌毛亚男李相东于文坛童乐
Owner MAANSHAN IRON & STEEL CO LTD
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