Objective of this study was effects of Nb(Niobium) contents and age hardening conditions on the strength of C200 maraging steel which are commonly using in aircraft, space field, nuclear energy, and vehicle etc. To investigate the effects, steel was m...
Objective of this study was effects of Nb(Niobium) contents and age hardening conditions on the strength of C200 maraging steel which are commonly using in aircraft, space field, nuclear energy, and vehicle etc. To investigate the effects, steel was manufactured by a VIM (Capacity: 30㎏f, Max Temp. : 1650℃, 10?³? Torr, 45 min/charge) added 0%, 0.03%, and 0.06% niobium with basic chemical compositions. And the steel was hot rolled automatically, solution annealed at 815℃ for I hour, and age hardened with 48%KNO₃+52NaNO₃ at 455℃, 482℃, and 510℃ for 1,2,4, and 8 hours each other.
The most excellent condition for elongation was 0.03% Nb material aged at 455℃ for 1 hour having about 97% of base metal. The most excellent aging condition was 8 hours aged at 482℃ with 0.06% Nb content showing that the strength of the specimen increased twice more than that of the base metal.