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A high-strength, high-toughness, thermal-crack-resistant bainitic steel wheel for rail transit and its manufacturing method

A technology of rail transit and bainitic steel, applied to bainitic steel wheels for thermal cracking-resistant rail transit and its manufacture, design and manufacture of steel grades for other parts and similar parts of rail transit, high toughness, high strength In this field, it can solve the problems of micro-crack initiation, low impact toughness, and peeling of the rim, and achieve good comprehensive mechanical properties, high impact toughness, and easy production control.

Active Publication Date: 2018-01-02
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (1) The yield strength of the rim is low, generally not exceeding 600MPa. Because the rolling contact stress between the wheel and the rail is large during the operation of the wheel, sometimes exceeding the yield strength of the wheel steel, the wheel is plastically deformed during operation, resulting in the subsurface of the tread Plastic deformation occurs, and because there are brittle phases such as inclusions and cementite in the steel, it is easy to cause micro-cracks on the rim, and these micro-cracks will produce defects such as peeling and rim cracking under the action of rolling contact fatigue of the wheel.
[0011] (2) The carbon content in the steel is high and the thermal damage resistance is poor
[0012] (3) Poor hardenability of wheel steel
Although this type of steel has good strength and toughness, the cross section of the rail is relatively simple, and the impact toughness at 20°C is not high, and the cost of the steel type is high

Method used

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  • A high-strength, high-toughness, thermal-crack-resistant bainitic steel wheel for rail transit and its manufacturing method
  • A high-strength, high-toughness, thermal-crack-resistant bainitic steel wheel for rail transit and its manufacturing method
  • A high-strength, high-toughness, thermal-crack-resistant bainitic steel wheel for rail transit and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070]A high-strength, high-toughness, thermal-crack-resistant bainitic steel wheel for rail transit, containing the following elements in the following table 2 in weight percentage.

[0071] A method for manufacturing a high-strength, high-toughness, thermal-crack-resistant bainitic steel wheel for rail transit, comprising the following steps:

[0072] The molten steel whose chemical composition is shown in Example 1 in Table 2 is formed through electric furnace steelmaking process, LF furnace refining process, RH vacuum treatment process, round billet continuous casting process, ingot cutting and rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: heating to 860-930° C. for 2.0-2.5 hours, cooling the rim tread with controlled water spray, then tempering at 220° C. for 4.5-5.0 hours, and then cooling to room temperature.

[0073] Such as Figure 2a , Figure 2b As shown, the metallographic s...

Embodiment 2

[0075] A high-strength, high-toughness, thermal-crack-resistant bainitic steel wheel for rail transit, containing the following elements in the following table 2 in weight percentage.

[0076] A method for manufacturing a high-strength, high-toughness, thermal-crack-resistant bainitic steel wheel for rail transit, comprising the following steps:

[0077] The molten steel whose chemical composition is shown in Example 2 in Table 2 is formed through steelmaking process, refining process, vacuum degassing process, round billet continuous casting process, ingot cutting process, forging and rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: heating to 860-930° C. for 2.0-2.5 hours, cooling the rim tread with controlled water spraying, then tempering at 280° C. for 4.5-5.0 hours, and cooling to room temperature.

[0078] Such as Figure 3a , 3b , 3c, and 3d, the metallographic structure of the whe...

Embodiment 3

[0080] The molten steel whose chemical composition is shown in Example 3 in Table 2 is formed through steelmaking process, refining process, vacuum degassing process, round billet continuous casting process, ingot cutting process, forging and rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: heating to 860-930° C. for 2.0-2.5 hours, cooling the rim tread with controlled water spray, and then tempering at 320° C. for 4.5-5.0 hours.

[0081] Such as Figure 5a , 5b 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 matching of the wheel is better than that of the CL60 wheel.

[0082] The chemical composition (wt %) of table 2 embodiment 1,2,3 and comparative example wheel

[0083]

[0084] Table 3 Embodiment 1, 2, 3...

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Abstract

The invention provides a high-strength, high-toughness, thermal-crack-resistant bainite steel wheel for rail transit and a manufacturing method thereof. 0.20~1.00%, boron 0.0001~0.035%, nickel 0.10~1.00%, phosphorus≤0.020%, sulfur≤0.020%, the rest is iron and unavoidable residual elements; and 1.50%≤Si+Ni≤3.00%, 1.50% ≤Mn+Ni+Cu≤3.00%. Compared with the prior art, the present invention enables the wheel rim to obtain a carbide-free bainite structure through the chemical composition design of the steel and the wheel manufacturing process, especially the heat treatment process and technology; Supersaturated ferrite-based metallographic structure, the wheel has high strength, high toughness, and thermal crack resistance.

Description

technical field [0001] The invention belongs to the fields of steel chemical composition design and wheel manufacturing, and in particular relates to a high-strength, high-toughness, thermal-crack-resistant bainite steel wheel for rail transit and a manufacturing method thereof, as well as other parts and similar parts of rail transit Steel design and manufacturing methods. Background technique [0002] "High speed, heavy load and low noise" is the main development direction of rail transit in the world. 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). At the same time, more importantly, it has a very complex interaction with the rails, brake shoes, axles, and surrounding media. relationship, in a dynamic and alternately changing stress state, especi...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/16C22C38/32C22C38/08C21D1/18C21D9/34
CPCC21D1/18C21D9/34C22C38/02C22C38/04C22C38/08C22C38/16C22C38/32C21D2211/005C21D2211/002C21D9/0062C21D2211/001C22C2202/00
Inventor 张明如方政张峰殷潮海蒲玉梅程志远
Owner MAGANG (GROUP) HOLDING CO LTD
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