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Carbon steel high-speed rail axle with speed of not less than 400 kilometers per hour, and modification method thereof

A carbon steel and axle technology, applied in the field of carbon steel high-speed rail axle and its modification, can solve the problems of not meeting the application requirements of high-speed rail axles, low fatigue performance, etc., achieve good and uniform cooling, increase fatigue strength, and improve fatigue performance Effect

Active Publication Date: 2021-01-05
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Carbon steel high-speed rail axle with speed of not less than 400 kilometers per hour, and modification method thereof
  • Carbon steel high-speed rail axle with speed of not less than 400 kilometers per hour, and modification method thereof
  • Carbon steel high-speed rail axle with speed of not less than 400 kilometers per hour, and modification method thereof

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Embodiment 1

[0034] A carbon steel high-speed rail axle with a speed ≥ 400 kilometers per hour, comprising the following mass percentage components: as shown in Table 1, the balance not listed in Table 1 is Fe and unavoidable impurities.

[0035] Table 1 embodiment and comparative example chemical composition (unit: wt %)

[0036]

[0037] The production process of the carbon steel high-speed railway axle with a speed ≥ 400 kilometers per hour is as follows: axle blank forging → rough axle turning → axle end face processing → normalizing heat treatment → axle outer circle finishing turning → axle inner hole boring processing → outer Cylindrical grinding→flaw detection→laser quenching→cylindrical grinding.

[0038] The modification methods included in the above-mentioned production process include normalizing treatment and laser quenching.

[0039] The normalizing specifically includes: heating the axle to 860°C, keeping it warm for 7 hours, and then air cooling to below 300°C.

[0040...

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Abstract

The invention provides a carbon steel high-speed rail axle with a speed of not less than 400 kilometers per hour, and a modification method thereof. The carbon steel high-speed rail axle comprises thefollowing components: not less than 0.30% and not greater than 0.40% of C, not less than 0.15% and not greater than 0.50% of Si, not less than 0.90% and not greater than 1.20% of Mn, trace-0.015% ofP, trace-0.010% of S, not greater than 0.30% of Cr, not greater than 0.08% of Mo, not greater than 0.30% of Cu, not greater than 0.30% of Ni, not greater than 0.06% of V, and the balance Fe and otherinevitable impurities. Modification is carried out via normalizing treatment and laser quenching. Compared with the prior art, the surface hardness of the axle is not less than 620 HV, the surface residual pressure stress exceeds -800 MPa, and the fatigue strength exceeds 480 MPa and is increased by 83% compared with the fatigue strength (263 MPa) of an axle sample which is not subjected to laserquenching.

Description

technical field [0001] The invention belongs to the technical field of high-speed rail axles, in particular to a carbon steel high-speed rail axle with a speed ≥ 400 kilometers per hour and a modification method thereof. 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 materials selected are not the same. From the practice of foreign high-speed railway ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C21D1/09C21D1/18C21D1/28C21D1/74C21D6/00C21D9/28
CPCC22C38/02C22C38/04C22C38/002C22C38/44C22C38/42C22C38/46C21D1/28C21D1/09C21D1/18C21D1/74C21D6/004C21D6/005C21D6/008C21D9/28C21D2211/005C21D2211/009C21D2211/008Y02P10/20
Inventor 杜松林汪开忠胡芳忠陈世杰杨志强吴林郝震宇
Owner MAANSHAN IRON & STEEL CO LTD
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