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Alloy steel material for brake disc of rapid train

A technology for braking and high-speed trains is applied in the field of high-speed train brake disc alloy steel materials, and can solve the problems of inability to meet the emergency braking conditions of high-speed trains, poor mechanical strength and friction performance, etc.

Inactive Publication Date: 2012-04-04
BEIJING TIANYISHANGJIA NEW MATERIAL
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AI Technical Summary

Problems solved by technology

[0002] With the rapid development of high-speed railways in my country, the cast iron brake discs used in the past cannot meet the needs of emergency braking conditions for high-speed trains due to their poor mechanical strength and friction performance.

Method used

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Examples

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Comparison scheme
Effect test

Embodiment

[0005] According to the above chemical composition requirements, the alloy cast steel composition obtained is as follows (percentage by weight):

[0006] C Si mn Cr Ni P S Al Ti Re Mo V 0.27 0.7 1.0 1.38 1.97 0.005 0.006 2.04 0.45 0.24 0.34 0.15 Nb Cu Zr B W co 0.14 1.26 0.021 0.41 0.006 0.012

[0007] According to the above chemical composition requirements, the mechanical properties of the obtained alloy steel material at room temperature are as follows:

[0008] hardness HB 250～350 tensile strength σb ≥990MPa Yield Strength σs ≥990MPa elongation after break δ ≥30％ surface temperature ℃ 850

[0009] In this example, in the 1:1 brake power bench test of the brake disc, the maximum working temperature of the brake disc surface of the alloy steel material of this compos...

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Abstract

The invention discloses an alloy steel material for a brake disc of a rapid train. By adopting a most advance alloy design theory and optimizing proportions of elements in the alloy material, the alloy steel material for the brake disc of the rapid train has the following performances that: mechanical property is good, so that the alloy steel material does not deform easily at high-temperature working conditions and is more suitable for completion of the brake disc function of the rapid train; (2) heat and fatigue resisting property is excellent, so that the alloy steel material has no bluing and hot crake phenomena at the 600-DEG C high-temperature working condition; (3) wear resistance property is favorable, so that the alloy steel material has minimum wear rate still at the 700-DEG C high-temperature working condition; (4) stable frictional coefficient is achieved under all working conditions; and (5) thermal conductivity is favorable.

Description

technical field [0001] The invention relates to an alloy steel material used for brake discs of high-speed trains. Background technique [0002] With the rapid development of high-speed railways in my country, the cast iron brake discs used in the past cannot meet the needs of emergency braking conditions for high-speed trains due to their poor mechanical strength and friction performance. Therefore, for high-speed train brake discs, alloy steel discs with high mechanical strength and good thermal fatigue performance must be used. At the same time, the material of the brake disc must also have good thermal crack resistance, stable friction performance and good heat dissipation. Contents of the invention [0003] The invention relates to a new type of alloy steel material for high-speed train brake discs. The chemical composition of the material (by weight percentage): carbon C: 0.25-0.30, silicon Si: 0.6-0.8, manganese Mn: 0.8-1.2, Chromium Cr: 1.3~1.6, Nickel Ni: 1.8~2,...

Claims

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Application Information

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IPC IPC(8): C22C38/54
Inventor 吴佩芳冯学理
Owner BEIJING TIANYISHANGJIA NEW MATERIAL
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