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Alloy 20(Carpenter 20, UNS N08020) is a low-carbon, niobium stabilized with copper and molybdenum austenitic nickel-iron-chromium alloy.
This superalloy has excellent resistance to general corrosion, pitting, and crevice corrosion in chemicals containing chlorides and sulfuric, phosphoric, and nitric acids. It also contains niobium for stabilization against sensitization and resultant intergranular corrosion. At 33% nickel, Alloy 20 has practical immunity to chloride stress corrosion cracking. This alloy is often chosen to solve SCC(stress corrosion cracking) problems, which may occur with 316L stainless.
Grade | Ni | Cr | Cu | Mn≤ | Mo | Si≤ | C≤ | P≤ | S≤ | Fe | Nb+Ti |
Alloy 20 | 32.0-38.0 | 19.0-21.0 | 3.0-4.0 | 2.0 | 2.0-3.0 | 1.0 | 0.07 | 0.045 | 0.035 | Remainder | 8*C-1.0 |
Mechanical properties | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) |
Alloy 20 | 80[551] | 35[241] | 30 |
Pipe &Tube Smls | Pipe Welded | Sheet/Plate | Bar | Forging | Fitting |
B729 | B474,B464 | B463 | B472,B473 | B564 | B366 |
Alloy 20 Equivalent Grades
STANDARD | WERKSTOFF NR. | UNS | AFNOR | EN |
Alloy 20 | 2.4660 | N08020 | Z2NCUD31-20AZ | NiCr20CuMo |
Alloy 20 Applications：
Synthetic rubber manufacturing equipment
Processing of pharmaceuticals, plastics and organic and heavy chemicals
Tanks, piping, heat exchangers, pumps, valves, and other process equipment
Acid cleaning and pickling equipment
Chemical process piping, reactor vessels
Bubble caps
Petrochemical process equipment
Food and dye production
