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Since 1952, Alloy Digest has been the leading reference for materials property data on metals and alloys used throughout the world. Featuring graphs, charts and tables, these sheets give facts and figures on composition or characterization, physical and mechanical properties, heat treatment, and machinability.

Alloy 19D (UNS S32001) is a lean duplex (ferritic-austenitic) stainless steel developed and patented by AK Steel and registered as the trade-mark Nitronic 19D. Compared to conventional duplex and super-duplex stainless steels, alloy 19D has a reduced chromium content, man-ganese is substituted for most of the nickel, and molybdenum is essentially eliminated. Gibson Tube conducted a development program to produce seam-welded 19D tubing. (See Ref 1 and 2.) Delivery of seam-welded 19D subsea umbilical tubing began during the summer of 2000.