Heat treatment method of novel alloy steel hollow car axle material

Abstract

The invention belongs to the technical field of heat treatment processes of alloy steel hollow car axle materials for high-speed passenger trains and particularly relates to a heat treatment method of a novel alloy steel hollow car axle material. The heat treatment method is characterized by pre-heating novel alloy steel with shaft blank sizes at the temperature of 910-950 DEG C, quenching the novel alloy steel at the temperature of 900-940 DEG and tempering the novel alloy steel at the temperature of 620-670 DEG C. The heat treatment method has the advantages that the developed novel alloy steel hollow car axle material for the high-speed passenger trains is domestically and independently developed, mechanical properties of axles which are treated by a heat treatment process matched with the material all exceed requirements of the European hollow car axle standard EN13261, the axles are good in obdurability matching, especially, high in smooth specimen fatigue strength and notch specimen fatigue strength and excellent in low temperature impact toughness, so that the axles can be used under various domestic weather conditions. According to the heat treatment method of the novel alloy steel hollow car axle material, heat treatment process technical assurance is provided for finally producing novel alloy steel hollow car axles at the speed of 200km / h-350km / h.

Description

technical field [0001] The invention belongs to the technical field of heat treatment technology for alloy steel hollow axle materials used in high-speed railway passenger cars, and in particular relates to a heat treatment method for novel alloy steel hollow axle materials. Background technique [0002] In recent years, the high-speed railway with a speed of more than 200 km / h has developed rapidly in my country. It not only revitalizes the traditional railway industry, but also drives other related industries and promotes the development of my country's national economy. So far, there are four types of high-speed (above 200 km / h) passenger car axles operated by Chinese railways: CRH1, CRH2, CRH3 and CRH5, which mainly rely on imports. Among them, the CRH2 type is imported from Japan, which adopts the technical route of carbon steel and surface strengthening treatment; the other types are imported from Europe, and uses quenched and tempered alloy steel EA4T and 30NiCrMoV12....

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Problems solved by technology

Among them, the CRH2 type is imported from Japan, which adopts the technical route of carbon steel and surface strengthening treatment; the other types are imported from Europe, and uses quenched and tempered alloy steel EA4T and 30NiCrMoV12. The chemical composition and mechanical performance requirements are specified, but the key heat treatment technology for manufacturing axles is not given

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