The material valuable: All grades of stainless steels.
Duplex & super duplex: UNS S31803, S32760, S32750, ASTM A453 grade 660 A, B, C, D, 904L.
Nickel alloys & super alloy steels:
Inconel 625, 718.
Incoloy 800, 800HT, 825, 925.
Monel 400, 500.
Hastelloy B3, C276, C4.
Petrochemical grades: ASTM A193 B7, B8, B8M, B16, A194 2H, A320, L7, L7M, titanium, etc.
Others: Nimonic 80A, 254SMo, 17-4PH, Alloy 59.