Axle shaft steel and preparation method thereof

Abstract

The invention provides an axle shaft steel. The axle shaft steel comprises the following chemical components in percentage by weight: 0.47 to 0.54 percent of C, 0.2 to 0.4 percent of Si, 0.7 to 0.9 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, 0.02 to 0.04 percent of Al, 0.02 to 0.06 percent of V, 0.15 to 0.3 percent of Cr, less than or equal to 0.2 percent of Ni, less than or equal to 0.2 percent of Cu, less than or equal to 0.00025 percent of H, less than or equal to 0.002 percent of O, less than or equal to 0.007 percent of N, and the balance of iron and impurities. The invention also provides a preparation method for the axle shaft steel. The axle shaft steel provided by the invention not only has higher proper strength and toughness,but also ensures the production cost to be lower than that of the axel shaft prepared through repeated thermal treatment in the prior art.

Description

technical field [0001] The invention relates to an axle steel and a preparation method thereof. Background technique [0002] As an important part of a railway vehicle, the axle is under alternating stress for a long time. Therefore, the axle should not only have high strength, but also have good plasticity and toughness. At present, the axles used at home and abroad are generally made of high-quality medium-carbon carbon steel. For example, the American AAR M101 standard specifies the chemical composition of axle steel: C 0.45%-0.59%, Si≥0.15%, Mn 0.60%-0.90%, P≤ 0.045%, S≤0.050. Japanese JIS E4502-1 stipulates that the composition of axle steel is: C 0.30%-0.50%, Si≤0.50%, Mn≤1.20%, P≤0.040%, S≤0.040, Cr≤0.30%, Cu≤0.30%, Mo≤ 0.08%, V≤0.05%. The European UIC811-1 standard stipulates that the composition of C45 steel for axles is C 0.42%-0.50%, Si0.15%-0.40%, Mn 0.50%-0.80%, P≤0.035%, S≤0.035, Cr≤0.30%, Ni ≤0.30%, Cu≤0.30%, Mo≤0.08%, V≤0.05%. At present, my country usua...

AI Technical Summary

Problems solved by technology

Therefore, it is basically impossible to improve the strength of steel by increasing the content of C, Si, and Mn elements in steel without losing the ductility and toughness of steel.

In practice, in order to improve the strength and toughness of LZ50 axle steel, it is generally achieved through multiple heat treatments (i.e. repeated "2 times of normalizing + 1 time of tempering" process), but the strength and toughness increased by this method are limited. , and lead to increased production costs

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