Products Description
B729 Uns N08020 A790 Duplex 2205 Tube
Advantages of B729 Uns N08020 A790 Duplex 2205 Tube
- ASTM B729 UNS N08020 (Alloy 20): Designed for acidic environments (especially sulfuric acid), it's the choice when sour corrosion resistance is more important than high mechanical strength. It's widely used in chemical and petrochemical plants, reactors, heat exchangers, storage tanks, and piping systems exposed to strong acids.
- ASTM A790 Duplex 2205 (S32205/S31803): Developed for chloride-rich environments (such as seawater, brines, and process fluids), it's the choice when high strength and resistance to chloride-induced stress corrosion cracking are required. It's used in offshore oil and gas, desalination, marine engineering, pulp and paper, and structural piping.
applications of B729 Uns N08020 A790 Duplex 2205 Tube
- UNS N08020 (Alloy 20): Sulfuric acid plants, chemical processing, heat exchangers, reactors, pharmaceutical equipment.
- Duplex 2205: Offshore oil & gas piping, desalination plants, seawater handling, chemical process lines, pulp & paper digesters, marine engineering.
Chemical Composition
| Element | Carbon | Manganese | Silicon | Phosphorus | Sulfur | Chromium | Nickel | Molybdenum | Copper | Nitrogen |
| UNS N08020 | 0.07 | 2.0 | 1.0 | 0.045 | 0.035 | 19–21 | 32–38 | 2–3 | 3–4 | – |
| Duplex 2205 | 0.03 | 2.0 | 1.0 | 0.03 | 0.02 | 21–23 | 4.5–6.5 | 2.5–3.5 | – | 0.14–0.20 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa, 0.2%) | Elongation (%) | Hardness (HB) |
| UNS N08020 | ≥ 620 | ≥ 300 | ≥ 30 | ≤ 225 |
| Duplex 2205 | ≥ 655 | ≥ 450 | ≥ 25 | ≤ 290 |
Possible Alternative Grades
- Super Duplex Stainless Steel (S32750 / S32760): For higher chloride and seawater resistance.
- Austenitic Stainless Steel (316L, 317L): For moderate corrosion environments with lower strength requirements.
- Nickel Alloys (Alloy 625, C-276): For extremely severe, highly acidic, or reducing conditions.
- Lean Duplex (S32101, S32304): For cost-sensitive projects requiring moderate strength and corrosion resistance.
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