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Nordic Carved Armor requires a Smithing level of 50 and the Advanced Armors perk to create. Pieces can be upgraded with a quicksilver ingot at a workbench and also benefit from the Advanced Armors perk, which doubles the improvement.
General Tullius' Armor can be upgraded at a workbench with a steel ingot, though it does not benefit from any Smithing perks. This means the armor cannot be improved past flawless quality without boosting the Smithing skill over 100.