NiMark® T-250

NiMark® T-250 is a titanium-strengthened 18% nickel maraging steel designed to achieve ultra-high strength (250 ksi UTS) and toughness of NiMark® 250 (cobalt-strengthened 18% nickel maraging steel). NiMark® T-250 contains no cobalt and less molybdenum than NiMark® 250 to reduce raw material cost without sacrificing mechanical strength or toughness. NiMark® T-250 is vacuum induction melted (VIM) plus vacuum arc remelted (VAR) to achieve a very clean and homogeneous microstructure, which contributes to toughness and fatigue performance. Like other nickel maraging alloys, NiMark® T-250 is typically supplied in the solution annealed condition, and peak properties are developed after a simple one-step, low-temperature aging thermal treatment (900°F, 4–6 hours, air cool). A high degree of dimensional stability is maintained through the aging process.