20CrMnTiH gear steel and preparation method thereof

The invention provides 20CrMnTiH gear steel and a preparation method thereof, and relates to the field of metallurgy. The preparation method of the 20CrMnTiH gear steel comprises the following steps: continuously casting molten steel of the 20CrMnTiH gear steel under the conditions of low superheat degree, constant temperature, constant speed, weak cooling and dynamic end stirring to obtain a casting blank; performing high-temperature diffusion heating on the casting blank, wherein the high-temperature diffusion heating comprises preheating, first-stage heating, second-stage heating and soaking which are performed in sequence; and rolling the casting blank subjected to high-temperature diffusion heating, and then quickly cooling to obtain the 20CrMnTiH gear steel. According to the method provided by the invention, the 20CrMnTiH gear steel of which the banded structure grade is less than or equal to 1.5 grade can be obtained. 本申请提供一种20CrMnTiH齿轮钢及其制备方法，涉及冶金领域。20CrMnTiH齿轮钢的制备方法，包括：将20CrMnTiH齿轮钢的钢水在低过热度、恒温恒速、弱冷却和