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A nickel-iron-chromium alloy with additions of molybdenum and copper. Alloy 20 has great resistance to pitting, general corrosion, and crevice corrosion in chemicals containing sulfuric, nitric, and phosphoric acids as well as chlorides. It also contains niobium for stabilization and is used for piping, tanks, pumps, valves, heat exchangers, and other process equipment.
Forms in Stock
Welded Pipe 6″-12″ 10s, 40s ASTM/ASME 464
Smls Pipe ½”-8″ 10s, 40s, 80s, 160 ASTM/ASME 729
B/W Fittings ½”-12″ 10s, 40s, 80s ASTM/ASME 366
Flanges ½”-12″ 150#, 300# ASTM/ASME 462
Pressure Fittings ½”-2″ 3000# THRD/SW ASTM/ASME 462
Limiting Chemical Composition, %
Ni…32.0-38.0 Nb…1.0 max.
Fe…Remainder C….0.07 max.
Cr…19.0-21.0 Mn…2.0 max.
Cu…3.0-4.0 P….0.045 max.
Nb + Ta…8 x C-1.0 S….0.035 max.
Mo…2.0-3.0 Si…1.0 max.