Alloy 20 Pipe, Fittings, Flanges, & Fasteners

Alloy 20 pipe, valves,  fittings, and fasteners are an iron-based, austenitic alloy.  It includes a combination of nickel, iron, and chromium with additions of molybdenum and copper. Alloy 20 pipe, valves,  fittings, and fasteners has great resistance to pitting and corrosion from chemicals containing sulfuric, nitric, and phosphoric acids.  Common applications include, but are not limited to: chemical processing, chemical storage, food processing, and pharmaceutical equipment.  Alloy 20 pipe, valves,  fittings, and fasteners are also suitable for welding and fabrication.  Additional niobium in Alloy 20 pipe, valves,  fittings, and fasteners provides for stabilization in the construction of piping, tanks, pumps, valves, and heat exchangers.   However, per ASME specification, Alloy 20 pipe, valves,  fittings, and fasteners are limited to a maximum temperature of 1000°F.

MSI Product Availability

MSI Supply can generally provide the items listed below for a one to three day delivery.  Large quantities may be subject to a longer lead time for delivery.  MSI can also provide many sizes outside these ranges, however, they too may be susceptible to longer lead times.

Commodity Size Rating ASTM Specification
Welded Pipe 6"-12" 10s, 40s ASTM 464
Seamless Pipe ½"-8" 10s, 40s, 80s, 160 ASTM 729
Butt Weld Fittings ½"-12" 10s, 40s, 80s ASTM 366
Flanges ½"-12" 150#, 300# ASTM 462
Pressure Fittings ½"-2" 3000# ASTM 462
Stud Bolts ½"-4" Any Length ASTM 468
Seamless Tubing 1/8" - 2" .095" Wall & Below ASTM 729
Welded Tubing 1/8" - 2" .095" Wall & Below ASTM 464


  • 20 Cb-3 (® Carpenter Technology Corporation)
  • ATI 20 (® Allegheny Technologies Incorporated)
  • Incoloy Alloy 20 (® Special Metals)
  • Nickelvac 23 (® Allegheny Technologies Incorporated)
  • Nicrofer 3620 Nb (® ThyssenKrupp VDM)

MSI offers a large selection of Alloy 20 pipe, valves,  fittings, and fasteners seamless pipewelded pipebuttweld fittingsforged steel fittingsflanges, and tubing.

Chemical Composition (%)

Fe Ni Cr Mo Cu Nb + Ta Mn
Balance 32 to 38 19 to 21 2 to 3 3 to 4 (8 x C%) to 1 2 1 0.045 0.035 0.07