Processing technology for grain refinement of railway bearing forging piece made of carburized steel

The invention relates to a processing technology for grain refinement of a railway bearing forging piece made of carburized steel. The processing technology is characterized in that the processing technology adopts the following technical schemes that (1) the grain size of raw materials is inspected; (2) sawing and blanking are conducted; (3) heating is conducted, specifically, the initial forgingtemperature is less than or equal to 1200 DEG C, and the final forging temperature is greater than or equal to 850 DEG C; (4) forging is conducted, specifically, at the key position of the forging process, it is ensured that the initial forging temperature is less than or equal to 1200 DEG C, and the final forging temperature is greater than or equal to 850 DEG C; (5) extend-rolling is conducted,specifically, as for the key position of the extend-rolling process, it is ensured that the initial forging temperature is less than or equal to 1200 DEG C, and the final forging temperature is greater than or equal to 850 DE