Steel for large power locomotive traction gear

Abstract

This invention discloses steel, in particular to steel for large power locomotive traction gear. The steel comprises the following components in mass percent: 0.16 to 0.21 percent of carbon, 1.50 to 1.80 percent of chromium, 1.50 to 1.70 percent of nickel, less than 0.40 percent of silicon, 0.50 to 0.90 percent of manganese, less than 0.020 percent of sulfur, less than 0.020 percent of phosphor, 0.25 to 0.35 percent of molybdenum, and balance of iron, wherein hydrogen content is not more than 2 ppm; and oxygen content is not more than 20 ppm. Compared with the prior art, the steel for large power locomotive traction gear has the advantages that chemical components are adjusted, carbon content and nickel content are increased, the strength is ensured and simultaneously the plasticity is improved, sulfur content and phosphor content are adjusted simultaneously, the processing property is ensured, a novel material which has high strength and good plasticity and can be processed easily is formed, and the special requirement for the steel for large power locomotive traction gear is satisfied.

Description

technical field [0001] The invention relates to a steel product, in particular to a steel for a traction gear of a high-power locomotive. Background technique [0002] With the rapid development of railways in the direction of high speed and heavy load, it is necessary to develop high-power and high-speed railway locomotives, such as 7200Kw and 9600Kw electric locomotives, and locomotive traction gears are key components of locomotives. Large, requiring high bending strength and high contact fatigue strength. [0003] In order to meet the high bending strength requirements of the gear, the hardenability of the steel must be high. In order to meet the high contact fatigue strength of the gear, the steel is required to have a high hardenability of the infiltrated layer to ensure that the The carbon layer can obtain more than 99% martensitic structure. The design of the hardenability of the steel should ensure that the heat treatment deformation of the gear is small, so as to...

AI Technical Summary

Problems solved by technology

However, while the tensile strength is required to be above 1000MPa, the impact energy is also required to be above 40J, which cannot be achieved according to the above-mentioned European or German material ratio.

That is, the existing materials cannot meet both high strength and high plasticity, which brings troubles to the manufacture of traction gears for locomotives