Cr-Mn-Ti gear steel and preparation thereof

The invention provides a production method for a novel Cr-Mn-Ti gear steel, characterized in that the invention uses the production process flow of initial refining with an electric furnace or a rotary furnace, LF refining, treatment for refined steel liquid with a vacuum furnace, fully-protective continuous casting and rolling formation. An initial-refining furnace melts the initial-refining steel liquid, forms steel in the range from 1620 to 1670 DEG C and adds synthesized dregs; the refining of the steel liquid is performed in a steel container refining furnace and the temperature is controlled in the range from 1520 to 1630 DEG C, the steel is made after refining for 30 to 50 minutes; then the refined steel liquid is vacuum performed on the vacuum furnace, argon gas is blown into the bottom of the steel container; in the end, the continuous casting is carried out under the condition of full protection. The invention, in terms of guaranteeing the intensity of the CrMnTi gear steel and considering the fatigue limit, controls the Ti content in the CrMnTi gear in the range from 0.01% to 0.038%, which can not only control the CrMnTi gear steel not to enlarge the grain at the carburizing temperature to reduce the impurities, thus improving the steel quality, but also is beneficial to improving the fatigue life of the gear.