Axle shaft steel for railway vehicle and production method of axle shaft steel

A technology for railway vehicles and production methods, which is applied in the field of axle steel for railway vehicles and its production, and can solve problems such as low transverse impact energy, magnetic marks on the surface of axle steel, instability, etc., so as to reduce quality objections, reduce production costs, The effect of improving the safety of use

Active Publication Date: 2018-07-31
MAGANG (GROUP) HOLDING CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, at present, most of the axle steels produced according to the above standards have surface magnetic defects, and the transverse impact energy is low and unstable.

Method used

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  • Axle shaft steel for railway vehicle and production method of axle shaft steel
  • Axle shaft steel for railway vehicle and production method of axle shaft steel
  • Axle shaft steel for railway vehicle and production method of axle shaft steel

Examples

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Embodiment Construction

[0033] The present invention will be described in detail below in conjunction with examples.

[0034] The chemical components and weight percentages of the axle steels of Examples 1-6 and Comparative Examples 1-2 are shown in Table 1.

[0035] Table 1

[0036]

[0037] The production process steps are as follows:

[0038] 110-ton electric furnace smelting→LF+RH refining→continuous casting→press processing (rolling billet→fast forging machine forging)→rough machining→heat treatment→finish machining→inspection and storage. Among them, in Examples 1 to 4, a lanthanum-cerium rare-earth alloy ingot with a purity of 99% was added before the void breaking at the end of the RH refining treatment. In Examples 5-6, after the RH refining treatment, the lanthanum-cerium rare-earth alloy wire with a purity of 99% is fed, and the argon and soft blowing are weakly blown.

[0039] The heat treatment process parameters of each embodiment and comparative example are shown in Table 2.

[...

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Abstract

The invention discloses axle shaft steel for a railway vehicle and a production method of the axle shaft steel. The axle shaft steel comprises, by weight percentage, 0.33-0.38% of C, 0.15-0.40% of Si,0.90-1.05% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.030-0.050% of V, 0.015-0.035% of Als, 0.0040-0.0090% of N and the balance iron and inevitable impurity elements, wherein the adding amount of RE in molten steel ranges from 0.020% to 0.050%. A production process of the axle shaft steel comprises the steps of smelting, LF and RH refining, protected pouring, pressure machining, rough machining, heat treatment, finish machining and inspection and warehousing. By means of the method, the defects that the surface magnetic mark rejection rate of existing axleshafts is high, and the lateral impact energy is low can be overcome; surface magnetic mark rejects of the railway vehicle axle shafts can be obviously reduced; comprehensive mechanical performance ofthe axle shaft steels is improved, in particular, the lateral impact energy is increased, and the lateral impact energy guarantee value is greater than or equal to 40 J; and thus, use safety of the axle shafts can be improved.

Description

technical field [0001] The invention relates to a structural steel for machinery manufacturing and a production method thereof, in particular to an axle steel for railway vehicles and a production method thereof. Background technique [0002] The railway vehicle axle is an important part to ensure the safety of railway vehicles, and its quality status is closely related to the safety of railway transportation. With the rapid development of China's railway transportation, the quality requirements for railway vehicle axles are also getting higher and higher. During the operation of railway vehicles, the vehicle bearings are subjected to bending force, torsion force and impact force, and are used under alternating stress conditions for a long time, so the stress situation is very complicated. The stress on the surface of the axle is the worst when it is in use. Therefore, it is particularly important to improve its surface quality on the premise of ensuring its comprehensive p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/06C21D8/00
CPCC21D8/005C21D2211/005C21D2211/009C22C38/001C22C38/005C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 完颜卫国宋强高振波
Owner MAGANG (GROUP) HOLDING CO LTD
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