Alloy steel high-speed rail axle and production method thereof

A production method and technology of alloy steel, applied in the direction of furnace type, furnace, heat treatment furnace, etc., can solve the problems that cannot meet the application requirements of high-speed rail axles, low fatigue performance, etc., and achieve good and uniform cooling, high phase transition temperature, hardness and strength Improved effect

Active Publication Date: 2020-12-11
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the key indicators such as residual stress and fatigue strength on the surface of the axle after laser quenching are not characterized. From the test results of the Rockwell hardness (70-85HR15N, converted into Vickers hardness of about 237-492HV) on the surface of the axle after laser quenching It is estimated that its fatigue performance is low and cannot meet the application requirements of high-speed rail axles with a speed of ≥400 kilometers per hour

Method used

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  • Alloy steel high-speed rail axle and production method thereof
  • Alloy steel high-speed rail axle and production method thereof
  • Alloy steel high-speed rail axle and production method thereof

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Embodiment 1

[0038] An alloy steel high-speed iron axle, including the following mass percentage components: as shown in Table 1, the balance not listed in Table 1 is Fe and unavoidable impurities.

[0039] Table 1 embodiment and comparative example chemical composition (unit: wt %)

[0040]

[0041]

[0042] The production method of the alloy steel high-speed rail axle comprises the following technological process:

[0043] Axle blank forging→rough turning of rough axle→axle end face processing→heat treatment→axle outer circle finishing turning→axle inner hole boring processing→cylindrical grinding→flaw detection→laser quenching→cylindrical grinding.

[0044] The heat treatment includes normalizing, quenching and tempering, specifically:

[0045] Normalizing process: heating the steel for high-speed rail axles to 920°C, keeping it warm for 6 hours, then air cooling to below 300°C;

[0046] Quenching process: heat the high-speed rail axle steel after normalizing to 900°C, keep it w...

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Abstract

The invention provides an alloy steel high-speed rail axle and a production method thereof. The alloy steel high-speed rail axle comprises the following components of, in percentage by mass, 0.22%-0.29% of C, 0.17%-0.37% of Si, 0.60%-0.80% of Mn, minus 0.015% of P trace, minus 0.010% of S trace, 0.95%-1.20% of Cr, 0.20%-0.30% of Mo, 0.15%-0.30% of Ni, 0.02%-0.06% of V, 0.010%-0.040% of Al, less than or equal to 0.20% of Cu, and the balance Fe and inevitable impurities. Compared with the prior art, through designed steel components, after normalizing, quenching and high-temperature tempering conventional heat treatment is conducted, laser quenching is conducted on the full length of the axle, the surface hardness of the axle is larger than or equal to 550 HV, the surface residual compressive stress exceeds minus 800 MPa, and the fatigue strength exceeds 570 MPa.

Description

technical field [0001] The invention belongs to the technical field of high-speed rail axles, and in particular relates to an alloy steel high-speed rail axle and a production method thereof, which have high fatigue life and can be used for high-speed rail axles with a speed of ≥ 400 kilometers per hour. Background technique [0002] The axle is a super-large stepped axisymmetric part with a maximum diameter of more than 200mm and a length of up to 2320mm. It forms a wheel set through an interference connection with the wheel and bears the full weight of the rolling stock. It is one of the three key parts of the railway vehicle. . Heavy-duty and high-speed trains are the key development directions of high-speed trains. The axle is the heaviest key moving part of a single body. Improving fatigue performance is the eternal theme of axle steel research and development. [0003] Due to the different national conditions and technical viewpoints of different countries, the axle m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/28C21D1/18C21D1/09C21D1/28C21D6/00C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46
CPCC21D9/28C21D1/18C21D1/09C21D1/28C21D6/004C21D6/005C21D6/008C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46
Inventor 陈世杰汪开忠胡芳忠杜松林杨志强吴林郝震宇
Owner MAANSHAN IRON & STEEL CO LTD
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