Appeared in 2000 and 2001 (I think) before returning to steel. Just spotted a new old stock 16"er on the Winstanleys site . . . (they still have an ex demo 20"er left too).
The main application of scandium by weight is in aluminium-scandium alloys for minor aerospace industry components. These alloys contain between 0.1% and 0.5% of scandium. They were used in the Russian military aircraft, specifically the MiG-21 and MiG-29.[22]