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Wheel steel for heavy duty goods train and manufacture method thereof

A technology for railway wagon and wheel steel, which is applied in the field of steel for railway wagon wheels with an axle load of 25 tons or more and below 120 km/h and its preparation, and can solve the problems of poor resistance to thermal damage, internal fatigue crack growth, and poor wear resistance , toughness and other issues, to achieve the effect of improving thermal damage resistance, enhancing wear resistance, and improving stability

Inactive Publication Date: 2008-12-03
MAANSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] From the comparison of these three steels, SSW-3R and CL60 have low carbon content, so they have good toughness, but their wear resistance is poor, while AAR-C has good wear resistance due to high carbon content, but its toughness Resistance, poor resistance to thermal damage and internal fatigue crack growth

Method used

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  • Wheel steel for heavy duty goods train and manufacture method thereof
  • Wheel steel for heavy duty goods train and manufacture method thereof
  • Wheel steel for heavy duty goods train and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The molten steel is formed through converter steelmaking process, LF furnace refining process, VD vacuum treatment process, continuous casting into round billet process, ingot cutting and rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: heat treatment at 850°C for 2.5 hours, water spray quenching for 200 seconds, and tempering treatment at 500°C for 4 hours. See Table 1 for the weight percent concentration of various elements in molten steel.

[0030] The metallographic state of the wheel rim made in this embodiment is consistent with the wheel made in the prior art, both are fine pearlite + a small amount of ferrite, which shows that the material of the present invention has good wear resistance, and does not give The preparation of the wheels increases any difficulty.

[0031] The changes of phase transition temperature Ac1 and Ac3 points under different heating rates obtained by th...

Embodiment 2

[0036] The molten steel is formed through converter steelmaking process, LF furnace refining process, VD vacuum treatment process, continuous casting into round billet process, ingot cutting and rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: heat treatment at 850°C for 2.5 hours, water spray quenching for 200 seconds, and tempering treatment at 500°C for 4 hours. See Table 1 for the weight percent concentration of various elements in molten steel.

[0037] The metallographic state of the wheel rim made in this embodiment is consistent with the wheel made in the prior art, both are fine pearlite + a small amount of ferrite, which shows that the material of the present invention has good wear resistance, and does not give The preparation of the wheels increases any difficulty.

[0038] The changes of phase transition temperature Ac1 and Ac3 points under different heating rates obtained by th...

Embodiment 3

[0043] The molten steel is formed through converter steelmaking process, LF furnace refining process, VD vacuum treatment process, continuous casting into round billet process, ingot cutting and rolling process, heat treatment process, processing, and finished product inspection process. The heat treatment process is as follows: heat treatment at 850°C for 2.5 hours, water spray quenching for 200 seconds, and tempering treatment at 500°C for 4 hours. See Table 1 for the weight percent concentration of various elements in molten steel.

[0044] The metallographic state of the wheel rim made in this embodiment is consistent with the wheel made in the prior art, both are fine pearlite + a small amount of ferrite, which shows that the material of the present invention has good wear resistance, and does not give The preparation of the wheels increases any difficulty.

[0045] The changes of phase transition temperature Ac1 and Ac3 points under different heating rates obtained by th...

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Abstract

The invention discloses a wheel steel used in a heavy-load railway freight car, which comprises the alloying elements by mass percentage (percent) as follows: C is 0.52 to 63 percent, Si is 0.50 to 0.10 percent, Mn is 0.80 to 1.20 percent, Cr is less than or equal to 0.70 percent, S is 0.005 to 0.020 percent, P is less than or equal to 0.030 percent, and the others are ferrum and impurity elements. A preparation method of the wheel steel comprises a converter steelmaking working procedure, an LF furnace refining working procedure, a VD vacuum treatment working procedure, a continuous round-billet casting working procedure, an ingot slicing rolling working procedure, a heat treatment working procedure, a machining working procedure, and a finished product detecting working procedure; the heat treatment working procedure comprises the steps that the heating treatment lasts for 2.0 to 2.5 hours under the temperature that ranges from 880 to 900 DEG C, the jet hardening satisfies 200 to 300S, and then the tempering treatment lasts for 3 to 4 hours under the temperature that ranges from 500 to 550 DEG C. A wheel, which is manufactured by using the wheel steel, increases the strength and the hardness performance obviously on the basis of preserving the original toughness and plasticity of the wheel.

Description

technical field [0001] The invention belongs to steel for railway vehicle wheels and a preparation method thereof, in particular to steel for railway wagon wheels with an axle load of more than 25 tons and less than 120 km / h and a preparation method thereof. Background technique [0002] The train wheel is one of the key components of the train, which has the functions of carrying, guiding, transmitting power to the rail and braking during the operation of the train. It not only bears the full load of the train, but more importantly, it is rolling at high speed, bearing alternating and dynamic mechanical loads, huge inertial force, impact force, braking force and thermal damage caused by brake friction temperature rise; And, with the wheel as the center, the wheel is the only component that has three pairs of friction pairs with the rail, the brake shoe, and the axle. Wheels run from north to south, from winter to summer, and face different line conditions, which also serio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C21D1/18C21D1/00
Inventor 李小宇安涛张斌江波李翔崔银会吴耀光陈刚王世付吴江淮张弘付秀琴
Owner MAANSHAN IRON & STEEL CO LTD
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