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Alloy 20, also known as Carpenter 20, is a highly corrosion-resistant austenitic stainless steel alloy designed primarily for use in sulfuric acid environments. It offers excellent resistance to chloride stress corrosion cracking, pitting, and crevice corrosion. With its combination of nickel, chromium, molybdenum, and copper, Alloy 20 provides outstanding performance in chemical processing, petrochemical, pharmaceutical, and marine applications while maintaining good mechanical properties and ease of fabrication.
| Product | Grades |
|---|---|
| Refractory Anchors | ASTM B473 UNS N08020, ASTM B462 UNS N08020, ASTM B729 UNS N08020, ASTM B464 UNS N08020 |
| Pipes | B729 |
| Tubes | B729 |
| Pipe Fitting | B366 |
| Forged Fitting | B564 |
| Flanges | B564 |
| Grade | Ni (%) | Cr (%) | Mo (%) | Cu (%) | Nb+Ta (%) | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Fe (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Alloy 20 | 32.0 – 38.0 | 19.0 – 21.0 | 2.0 – 3.0 | 3.0 – 4.0 | 8xC min – 1.0 max | 0.07 max | 1.0 max | 2.0 max | 0.045 max | 0.035 max | Balance |
| Grade | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (%) | Hardness (Brinell) |
|---|---|---|---|---|
| Alloy 20 | 551 | 241 | 30 | 217 HB |
Alloy 20, also known as Carpenter 20, is a nickel-iron-chromium austenitic alloy designed for superior corrosion resistance, particularly against sulfuric acid. It offers excellent resistance to pitting, crevice corrosion, and chloride stress-corrosion cracking, making it a preferred material in chemical, pharmaceutical, and food processing industries.
Used in storage tanks, piping, and process equipment handling sulfuric, phosphoric, and nitric acids.
Ideal for equipment requiring high corrosion resistance and sanitary processing standards.
Used in food production equipment exposed to acidic and chlorinated cleaning solutions.
Applied in heat exchangers, reactor vessels, and piping systems handling aggressive hydrocarbons.
Used in flue gas scrubbers, waste treatment, and environmental control equipment.
Suitable for seawater service where resistance to chloride-induced corrosion is required.