In a method for preparing a nickel-based alloy, an electrode is produced by VIM, VOF or VLF, heat-treated in a furnace between 500 and 1300° C. for 10 to 336 hours to reduce stresses and aging, the heat-treatment being conducted for at least 10 hours and at most 48 hours at 1000° C. to 1300° C., and cooled to between room temperature and less than 900° C., then remelted using ESR at 3.0 to 10 kg/minute to form an ESR block which is cooled to between room temperature and less than 900° C., and remelted again using VAR at 3.0 to 10 kg/minute and a remelting rate fluctuation range of less than 15%, preferably 10%, ideally 5%; the remelted VAR block is heat-treated between 500 and 1250° C. for 10 to 336 hours, then shaped into the desired product shape and dimension by hot or cold forming.