High-temperature carburizing and double-quenching process method for steel for heavy-duty gear

The invention belongs to the field of metal materials, and particularly relates to a high-temperature carburizing and double-quenching process method for heavy-duty gear steel. In order to solve the problems of long period, low efficiency, high cost and the like in the conventional carburizing process of the heavy-duty gear with the large carburizing layer and the problems of grain coarsening, poor comprehensive performance and the like in the high-temperature carburizing process, the diffusion rate of carbon atoms is increased by increasing the carburizing temperature, the carburizing period can be shortened, and energy consumption can be reduced. And meanwhile, original austenite grains are refined through the double-quenching process, the comprehensive performance of the structure is improved, and the problems that in the prior art, the microalloying cost of raw materials is high, and the pre-carburizing and re-carburizing process is tedious are solved. 本发明属于金属材料领域，具体涉及一种重载齿轮用钢的高温渗碳双淬火工艺方法。为解决大渗层重载齿轮在常规渗碳过