Alloy 20 is an austenitic, nickel-iron-chromium superalloy specifically developed for maximum resistance to acid attack. Often referred to as the "Sulfuric Acid Alloy," it provides exceptional protection against phosphoric acid, nitric acid, and hot chlorides, bridging the performance gap between stainless steel and high-cost nickel alloys.
Alloy 20 is uniquely stabilized with Columbium (Niobium) to minimize carbide precipitation during welding. This allows the material to be used in the as-welded condition in highly corrosive environments where standard alloys would suffer from intergranular attack.
| Grade | Ni (Nickel) | Cr (Chromium) | Fe (Iron) | Cu (Copper) | Mo (Moly) | Cb+Ta (Columbium) | Mn (Manganese) | Si (Silicon) |
|---|---|---|---|---|---|---|---|---|
| Alloy 20 (N08020) | 32.0 - 38.0 | 19.0 - 21.0 | Balance | 3.0 - 4.0 | 2.0 - 3.0 | 8xC min / 1.0 max | 2.0 max | 1.0 max |
| Grade | Tensile Strength (PSI) | Yield Strength (PSI) | Elongation (%) | Hardness (Rockwell B) | Density (lb/in³) | Elastic Modulus (psi) |
|---|---|---|---|---|---|---|
| Alloy 20 (Annealed) | 80,000 min | 35,000 min | 30% min | 95 max | 0.292 | 28.0 x 10⁶ |
Sulfuric Acid Resistant
Columbium-stabilized piping designed specifically to resist intergranular corrosion in sulfuric acid environments. Ideal for pickling tanks, chemical process piping, and heat exchangers.
Buttweld / Forged / SW
Precision fittings including elbows, tees, and reducers. These components maintain the alloy's structural integrity and corrosion resistance in the heat-affected zones of welds.
Acid Vessel Quality
High-quality flat products used for fabricating chemical storage tanks, mixing tanks, and pharmaceutical equipment requiring resistance to pitting and stress corrosion.
Forged Leak-Proof
Forged and CNC-machined flanges offering superior sealing for high-pressure acid headers and industrial valve assemblies in fertilizer and pesticide plants.
Corrosion Resistant Grip
High-tensile bolting solutions including stud bolts and heavy hex nuts. Specifically chosen for fastening components in chemical pumps and explosive-media pipelines.
Precision Ground PSQ
High-precision round bars and shafts designed for pump rotors, valve stems, and agitators used in acidic mixing environments. Excellent machinability.
Dhanavir Steel is a premier stockholder and global supplier of high-performance Stainless Steel, Special Alloys and Nickel Alloys.
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Dhanavir Steel provides end-to-end industrial steel solutions, specializing in Pipes, Fittings, and Flanges. We combine technical expertise in NACE and IBR testing with a robust global supply chain to deliver quality-assured materials for demanding environments.
Dhanavir Steel provides end-to-end industrial steel solutions, specializing in Pipes, Fittings, and Flanges. We combine technical expertise in NACE and IBR testing with a robust global supply chain to deliver quality-assured materials for demanding environments.