MANUFACTURING METHOD OF ANNULAR MOLDING

PROBLEM TO BE SOLVED: To provide a manufacturing method of an annular molding capable of stably and inexpensively manufacturing the annular molding being sufficiently high in mechanical strength by securing uniformity of a structure.SOLUTION: The manufacturing method of the annular molding comprises a forging step S2 of manufacturing a discoid forging body by forging an alloy element assembly and a ring rolling step S4 of manufacturing the annular molding by ring-rolling an annular intermediate body of forming a through-hole in the forging body. In the forging step S2, hot forging is executed by at least two times or more so as to fall within a range in which a stain rate is 0.5 sor less, an absolute value 1 of strain in the circumferential direction of the forging body is 0.3 or more, an absolute value h of the strain in the height direction of the forging body is 0.3 or more, and the ratio h/ 1 of the mutual absolute values of these strains is 0.4 or more and 2.5 or less.