HASTELLOY® B-3 – W. Nr. 2.4600 / UNS N10675 / ASTM B333, B335, B564
HASTELLOY® B-3
HASTELLOY® B-3 is a nickel-molybdenum alloy with excellent corrosion resistance in highly reducing environments, such as hydrochloric, sulfuric, acetic, and phosphoric acids. This alloy is particularly resistant to pitting corrosion, crevice corrosion, and chloride-induced stress corrosion cracking.
Compared to the previous HASTELLOY® B-2 alloy, the B-3® version shows a lower tendency to precipitate undesirable phases in the 500-820°C temperature range, thus improving workability and corrosion resistance.
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Reference standards:
- ASTM B333 (plates and sheets)
- ASTM B335 (bars)
- ASTM B564 (forgings)
Chemical composition (%)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Molybdenum (Mo) | 27.0 – 32.0 |
| Chromium (Cr) | 1.0 – 3.0 |
| Iron (Fe) | 1.0 – 3.0 |
| Cobalt (Co) | 3.0 max |
| Carbon (C) | 0.01 max |
| Manganese (Mn) | 3.0 max |
| Silicon (Si) | 0.10 max |
| Phosphorus (P) | 0.03 max |
| Sulfur (S) | 0.015 max |
| Tungsten (W) | 3.0 max |
Mechanical properties
| Product form | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
|---|---|---|---|
| Sheets ≤ 65 mm | 700 – 1000 | 340 min | 40 min |
| Bars/Forgings ≤ 90 mm | 700 – 950 | 325 min | 40 min |
Heat treatments
- Solution annealing: 1050 – 1080°C with rapid cooling in water, compressed air, or protective gas.
- Hot forming: Processing temperature between 1232 and 982°C, followed by solution annealing to maintain corrosion resistance.
- Cold forming: If deformation exceeds 15%, subsequent solution annealing is required.
Available forms
HASTELLOY® B-3® is available in the following forms:
Industrial applications
Thanks to its high corrosion resistance in highly reducing environments, HASTELLOY® B-3® is used in several sectors:
- Aerospace and Defense: Components for extreme chemical environments and protective coatings.
- Power Generation: Chemical treatment systems in power plants.
- Chemical and Pharmaceutical Industry: Production and storage of highly corrosive acids.
- Motorsport: Exhaust systems resistant to extreme conditions.
- Nuclear: Tanks and heat exchangers for corrosive environments.
- Oil & Gas: Components for oil refining and sour gas.
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