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Tool steel A3
AISI A3, is a carbon steel in the Air Hardening Tool Steel category. It is high quality cold work steel that can be oil quanched and tempered. After annealing it can reach hardness of 250HB. Its equivalent grades are: ASTM A681, FED QQ-T-570, UNS T30103.
David Mechanical Engineering Lead at 3D Hubs