This specification covers high-quality aircraft grade steel and maraging steels in the form of bars, forgings, mechanical tubing, rings, and forging and ring blanks. The alloy composition includes 18.5Ni, 12.0Co, 4.9Mo, 1.40Ti, and 0.10Al. It specifies materials that have undergone double vacuum melting followed by a solution treatment and aging process to achieve the desired properties for maraging steel grade 350.
*** Please note: This description may not be accurate, please refer to the official documentation.