Heat treatment process of high-speed train axle containing niobium

Abstract

The invention provides a heat treatment process of a high-speed train axle containing niobium. The axle contains the following chemical components: 0.25-0.32 wt% of C, 0.15-0.40 wt% of Si, 0.60-0.90 wt% of Mn, no more than 0.015 wt% of P, no more than 0.010 wt% of S, 1.00-1.20 wt% of Cr, 0.20-0.35 wt% of Mo, 0.15-0.30 wt% of Ni, 0.015-0.060 wt% of Nb, 0.10-0.30 wt% of Cu, 0.0008-0.0050 wt% of B, 0.010-0.050 wt% of Als, and the balance of iron and residual trace impurities. The heat treatment process of the axle is as below: (1) normalizing at 900-950 DEG; (2) quenching at 880-930 DEG; and (3) tempering at 620-680 DEG C.

Description

technical field [0001] The invention belongs to the field of axle steel, in particular to the technical field of alloy structural steel for high-speed train axles and heat treatment technology thereof. Background technique [0002] The axle is the key part of the vehicle's walking part. It bears the self-weight and load of the vehicle. It also bears the impact force and braking force when the vehicle is running and parking. The force situation is more complicated under high-speed and heavy-load conditions. It is a key component of railway construction. One of the three key parts (heavy rails, axles and wheels), the train axle is a super-large axisymmetric stepped shaft part with a maximum diameter of about 200mm and a length of about 2200mm. [0003] With the operation of high-speed railways in my country, the speed of trains has further increased. As one of the key components of railway trains, high-speed axles are important running components of railway trains, and their q...

AI Technical Summary

Problems solved by technology

Some European high-speed axle materials use high-alloy structural steel such as 30NiCrMoV12, which contains Cr0.60~1.00%, Ni2.70~3.30%, Mo0.40~0.60%, V0.08~0.13%, and there are many ty

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