Bainite steel wheel for rail traffic truck and manufacturing method of bainite steel wheel

A technology of rail transit and bainitic steel, applied in the field of rail transit, can solve problems such as poor thermal damage resistance, plastic deformation of wheel rim tread, poor hardenability, etc., to prolong service life, improve operating efficiency, and reduce friction coefficient Effect

Inactive Publication Date: 2018-11-06
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (1) The yield strength of the rim is low, generally not exceeding 650MPa. Because the rolling contact stress between the wheel and the rail is large and alternately changes during the operation of the wheel, sometimes exceeding the yield strength of the wheel steel, the subsurface of the wheel rim tread produces plasticity during operation Deformation, and because there are brittle phases such as inclusions and cementite in the steel, it is easy to cause micro-cracks in the rim. These micro-cracks will produce defects and failures such as peeling and rim cracks under the action of rolling contact fatigue during wheel operation.
[0012] (2) The carbon content in the steel is high and the thermal damage resistance is...

Method used

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  • Bainite steel wheel for rail traffic truck and manufacturing method of bainite steel wheel
  • Bainite steel wheel for rail traffic truck and manufacturing method of bainite steel wheel
  • Bainite steel wheel for rail traffic truck and manufacturing method of bainite steel wheel

Examples

Experimental program
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Effect test

Embodiment 1

[0081] A kind of bainite steel wheel for rail transit trucks, containing the chemical composition as described in Table 2, Example 1.

[0082] The manufacturing method is as follows: the molten steel whose chemical composition is shown in Example 1 in Table 2 is passed through the steelmaking process, the refining process, the vacuum degassing process, the round billet continuous casting process, the ingot cutting process, the forging and rolling process, the heat treatment process, processing, and finished product inspection. formed by the process. The heat treatment process is as follows: heating to 935°C for 4.2 hours, cooling the rim tread to 200-300°C with programmable water spray, and air cooling to room temperature.

[0083] Such as figure 2 As shown, the metallographic structure of the wheel rim prepared in this embodiment is mainly carbide-free bainite. The mechanical properties of the wheel in this embodiment are shown in Table 3, and the strength and toughness ma...

Embodiment 2

[0085] A kind of bainite steel wheel for rail transit trucks, containing the chemical composition as described in Table 2, Example 1.

[0086] The manufacturing method is as follows: the molten steel whose chemical composition is shown in Example 2 of Table 2 is passed through the steelmaking process, the refining process, the vacuum degassing process, the round billet continuous casting process, the ingot cutting process, the forging and rolling process, the heat treatment process, processing, and finished product inspection. formed by the process. The heat treatment process is as follows: heating to 940°C for 3.5 hours, cooling the rim tread to 200-350°C by spraying water under programmable control, and air cooling to room temperature, during which the residual heat of the rim, web, and hub is used for self-tempering; and then Then heat to 250-360°C for medium and low temperature tempering for 4 hours, then air cool to room temperature after tempering.

[0087] Such as im...

Embodiment 3

[0090] A kind of bainite steel wheel for rail transit trucks, containing the chemical composition as described in Table 2, Example 1.

[0091] The manufacturing method is as follows: the molten steel whose chemical composition is as shown in Table 2, Example 3, goes through the steelmaking process, the refining process, the vacuum degassing process, the round billet continuous casting process, the ingot cutting process, the forging and rolling process, the heat treatment process, processing, and finished product inspection. formed by the process. The heat treatment process is as follows: heating to 925°C for 4.0 hours, cooling the rim tread to 200-350°C by spraying water under programmable control, and air cooling to room temperature. Then heat to 300-400°C for medium and low temperature tempering for 3.0 hours, then air cool to room temperature after tempering.

[0092] Such as Figure 5 , 6As shown, the metallographic structure of the wheel rim prepared in this embodiment...

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Abstract

The invention discloses a bainite steel wheel for a rail traffic truck and a manufacturing method of the bainite steel wheel. The bainite steel wheel for the rail traffic truck comprises the followingchemical components: 0.10-0.40% of C, 0.10-1.50% of Ni, 0.25-1.50% of Cr, 0.70-2.10% of Mn, 0.20-1.00% of Si, 0.01-1.00% of W, 0.05-0.60% of Mo, 0.01-0.80% of Cu, 0.01-0.20% of V, 0.001-0.20% of Nb,0.0001-0.0350% of B, 0.001-0.040% of RE, less than or equal to 0.020% of P, less than or equal to 0.020% of S and the balance of Fe and inevitable residual elements; and moreover, 2.0%</= Mn+ Cr</= 3.0%. A novel alloy design system of C-Ni-Mn-Cr-Mo and an alloying principle are adopted, after wheels are formed and subjected to advanced heat treatment, a carbide-free bainite organization structureis obtained, and the wheels have excellent integrated mechanical property, corrosion resistance and service performance, and particularly have the characteristics of high strength, hardness and toughness, high wheel track rolling contact fatigue (RCF) resistance, hot crack resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of rail transit, and relates to a bainite steel wheel for rail transit trucks and a manufacturing method thereof, in particular to a rail with an axle load not greater than 35 tons, a wheel diameter of 760mm to 970mm, and a running speed of ≤160km / h Carbide-free bainitic steel wheels for transportation trucks and methods of manufacture thereof. Background technique [0002] Wheels are the "shoes" of rail transit and one of the most important walking parts, which directly affects the safety of operation. During the normal operation of the train, the wheel bears the full load of the vehicle and is damaged by wear and rolling contact fatigue (RCF for short). The very complex action relationship is always in a dynamic and alternating stress state, especially the wheels and rails, wheels and brake shoes are two pairs of friction pairs that exist all the time and cannot be ignored; in emergency situations or spec...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/42C22C38/44C22C38/46C22C38/48C22C38/54C22C38/58C21D9/34C21D1/78
CPCC21D1/78C21D9/34C21D2211/001C21D2211/005C22C38/005C22C38/02C22C38/42C22C38/44C22C38/46C22C38/48C22C38/54C22C38/58Y02P10/20
Inventor 张明如方政龚志翔赵海张磊董炜
Owner MAGANG (GROUP) HOLDING CO LTD
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