A kind of high hardenability gear steel and its manufacturing method

Abstract

The invention discloses high-hardenability gear steel. The high-hardenability gear steel comprises the chemical elements of, by mass, 0.19-0.25% of C, 0.15-0.35% of Si, 0.70-1.05% of Mn, 0.70-0.80% ofCr, 0.40-0.65% of Ni, larger than 0 and less than or equal to 0.20% of Cu, 0.33-0.40% of Mo, 0.020-0.050% of Al, 0.003-0.010% of Ti, 0.05-0.08% of b, 0.0001-0.0003% of B, 0.0080-0.0150% of N, and thebalance Fe and other inevitable impurities. The invention further discloses a gear which is obtained through the high-hardenability gear steel. In addition, the invention further discloses a manufacturing method of the high-hardenability gear steel. The high-hardenability gear steel is high in strength and good in toughness.

Description

technical field

[0001] The invention relates to a steel grade and a manufacturing method thereof, in particular to a gear steel and a manufacturing method thereof. Background technique

[0002] The drive axle gear of a commercial vehicle is used to transmit power and drive the vehicle forward. The gear has a large modulus and bears a large load. This gear requires high bending strength and high contact fatigue strength. In order to meet high bending strength The requirements of the requirements require that the steel has a high hardenability of the carburized layer to ensure that the carburized layer of the gear can obtain more than 99% of the martensite structure after carburizing and quenching. The design of steel hardenability should ensure that the heat treatment deformation of the gear is small to ensure the correct meshing between the active tooth and the passive tooth. If the hardenability of the steel cannot guarantee the bending strength (or core hardness) of the ge...

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