Abstract: The invention provides a method of fabricating a steel part, the method comprising the steps of: preparing and casting a steel having the following composition in percentage by weight: 0.06%?C?0.25%; 0.5%?Mn?2%; traces?Si?3%; traces?Ni?4.5%; traces?Al?3%; traces?Cr?1.2%; traces?Mo?0.30%; traces?V?2%; traces?Cu?3.5%; and satisfying at least one of the following conditions: 0.5%?Cu?3.5%; 0.5%?V?2%: 2?Ni?4.5% and 1%?Al?2%; ?the remainder being iron and impurities resulting from preparation; hot deforming the cast steel at least once at a temperature in the range 1100° C. to 1300° C. in order to obtain a blank of the part; controlled cooling of the blank for the part in still air or forced air; and heating the steel to perform precipitation annealing before or after machining the part from said blank. The invention also provides a part obtained by the method.