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Alloy B-3 (UNS N10675, 2.4600), also known as Hastelloy B-3, is a high-performance nickel-molybdenum alloy engineered for service in severe reducing acid environments. As an upgraded version of Alloy B-2, it features superior thermal stability and workability, while retaining outstanding resistance to hydrochloric acid and other non-oxidizing corrosive media.
Key Features Of Hastelloy B-3, UNS N10675
Hastelloy B-3 shows exceptional resistance to HCl and H₂SO₄. This alloy (UNS N10675) exhibits extremely high resistance to pure hydrochloric, hydrobromic, and sulfuric acids. Additionally, its structural stability is significantly improved compared to previous B-type alloys, and it is easier to weld and process. Like other nickel alloys, Hastelloy B3 is ductile, malleable, and weldable in an annealed condition. It is also resistant to corrosion in chloride-bearing solutions. It can also withstand fluoride-bearing media and concentrated sulfuric acid, which damages zirconium alloys. The alloy is available in plate, sheet, strip, billet, rod, wire, pipe, tube, and coated electrode forms. Many of these forms are used in the chemical process industry.
Chemical Composition (%) Of Alloy B-3
| Hastelloy B3 – UNS N10675 | ||
| Element | Simbol | Maximum % |
| Carbon | C | 0,01 |
| Manganese | Mn | 3,0 |
| Phosphorus | P | 0,030 |
| Sulfur | S | 0,010 |
| Silicon | Si | 0,10 |
| Nickel | Ni | 65,0 |
| Chrome | Cr | 1,0-3,0 |
| Molybdenum | Mo | 27,0-32,0 |
| Titanium | Ti | 0,20 |
| Aluminium | Al | 0,50 |
| Tungsten | W | 3,0 |
| Coulomb (Niobium) | Cb(Nb) | 0,20 |
| Copper | Cu | 0,20 |
| Iron | Fe | 1,0-3,0 |
| Vanadium | V | 0,20 |
| Zirconium | Zr | 0,10 |
| Tantalus | Ta | 0,20 |
Alloy B-3 UNS N10675 contains high levels of nickel and molybdenum, which grant it excellent resistance to general corrosion, pitting corrosion and stress corrosion cracking. It maintains stable performance in hydrochloric acid of all concentrations and temperatures, and delivers remarkable corrosion resistance against sulfuric acid, phosphoric acid, formic acid, acetic acid and other non-oxidizing acids.
UNS N10675 Physical Properties
The physical properties of HASTELLOY(r) B-3 are outlined in the following table.
| Density | Thermal Conductivity | Specific Heat | Melting Range | ||||
|---|---|---|---|---|---|---|---|
| lb/in3 | g/cm3 | Btu.in/h.ft2.°F | W/m.°C | Btu/lb.°F | J/kg*°C | °F | °C |
| 0.333 | 9.22 | 78 | 11.2 | 0.089 | 373 | 2500-2585 | 1370-1418 |
Hastelloy B-3 Mechanical Properties
The mechanical properties of HASTELLOY(r) B-3 are provided below.
| Properties | Metric | Imperial |
| Tensile strength (0.125in.) | 0.88 GPa | 129 ksi |
| Yield strength (0.125in.) | 0.44 GPa | 64.5 ksi |
| Elongation at break (0.125in.) | 57.50% | 57.50% |
Product Forms and Standards of Hastelloy B3
| Product Form | Standard |
|---|---|
| Sheet, Plate & Strip | ASTM B333 |
| Billet, Rod & Bar | ASTM B335, B472 |
| Coated Electrodes | DIN 2.4696 |
| Bare Welding Rods & Wire | DIN 2.4695 |
| Seamless Pipe & Tube | ASTM B622 |
| Welded Pipe & Tube | ASTM B619, B626 |
| Fittings | ASTM B366, B462 |
| Forgings | ASTM B564, B462 |
Heat Treatment of Machined Parts
| Status | Medicine | Temperature | Duration (Hr) | Cooling | ||
| °C | °F | |||||
| Tempered and Spring Tempered | Stress Relieve | 400 – 450 | 750 – 840 | 2 | Air | |
| Features | ||||||
| Status | Approximate Pulling Force | Approximate Operating Temperature | ||||
| N/mm² | ksi | °C | °F | |||
| Annealed | 1000 – 1200 | 145 – 174 | -200 to +400 | -330 to +750 | ||
| Spring Temper | 1600 – 2000 | 232 – 290 | -200 to +400 | -330 to +750 | ||
UNS N10675 Alloy B-3 boasts excellent physical properties. Compared with conventional nickel-molybdenum alloys, it has greatly enhanced thermal stability and is suitable for both hot and cold forming. With good ductility and superior weldability, it generally requires no post-weld heat treatment under normal service conditions. This effectively simplifies the manufacturing process for pipes, pipe fittings, pressure vessels and other related products.
Alloy B-3 Corrosion resistance
One characteristic of nickel alloys is their resistance to stress corrosion in chloride technology. The corrosion resistance of the materials was tested by boiling them in 45% magnesium chloride solution (ASTM Standard G36). Hastelloy B3, Hastelloy C-276, and Inconel 625 perform comparatively better than austenitic stainless steels. Tests were conducted after 1,008 hours (six weeks).
| Alloy | Cracking corrosion time |
| 316L | 2 h |
| 254SMO | 24 h |
| Inconel 625 | No cracking after 1008 hours |
| Hastelloy C-276 | No cracking after 1008 hours |
| Hastelloy B-3® | No cracking after 1008 hours |
Hydrochloric Acid
| % | 50°F | 75°F | 100°F | 125°F | 150°F | 175°F | 200°F | 225°F | Kaynar |
| 10°C | 24°C | 38°C | 52°C | 66°C | 79°C | 93°C | 107°C | ||
| 1 | – | – | 0.07 | 0.11 | 0.18 | – | 0.21 | – | 0.01 |
| 1.5 | – | – | – | – | – | – | – | – | – |
| 2 | – | – | 0.10 | 0.16 | 0.21 | – | 0.26 | – | 0.04 |
| 2.5 | – | – | – | – | – | – | – | – | – |
| 3 | – | – | – | – | – | – | – | – | – |
| 3.5 | – | – | – | – | – | – | – | – | – |
| 4 | – | – | – | – | – | – | – | – | – |
| 4.5 | – | – | – | – | – | – | – | – | – |
| 5 | – | – | 0.11 | 0.19 | 0.25 | – | 0.30 | – | 0.08 |
| 7.5 | – | – | – | – | – | – | – | – | – |
| 10 | – | – | 0.13 | 0.20 | 0.24 | – | 0.29 | – | 0.13 |
| 15 | – | – | 0.10 | 0.18 | 0.23 | – | 0.28 | – | 0.21 |
| 20 | – | – | 0.10 | 0.15 | 0.21 | – | 0.30 | – | 0.29 |
Sulfuric Acid
| % | 75°F | 100°F | 125°F | 150°F | 175°F | 200°F | 225°F | 250°F | 275°F | 300°F | 350°F | Boiling | ||
| 24°C | 38°C | 52°C | 66°C | 79°C | 93°C | 107°C | 121°C | 135°C | 149°C | 177°C | ||||
| 1 | – | – | – | – | – | – | – | – | – | – | – | – | ||
| 2 | – | 0.07 | 0.09 | 0.13 | 0.11 | 0.10 | – | – | – | – | – | 0.01 | ||
| 3 | – | – | – | – | – | – | – | – | – | – | – | – | ||
| 4 | – | – | – | – | – | – | – | – | – | – | – | – | ||
| 5 | – | 0.07 | 0.08 | 0.15 | 0.13 | 0.11 | – | – | – | – | – | 0.01 | ||
| 10 | – | 0.04 | 0.08 | 0.11 | 0.11 | 0.11 | – | – | – | – | – | 0.01 | ||
| 20 | – | 0.03 | – | 0.08 | – | 0.11 | – | – | – | – | – | 0.02 | ||
| 30 | – | 0.02 | – | 0.06 | – | 0.09 | – | – | – | – | – | 0.02 | ||
| 40 | – | – | – | 0.03 | – | 0.06 | – | – | – | – | – | 0.02 | ||
| 50 | – | – | – | 0.03 | – | 0.04 | – | – | – | – | – | 0.03 | ||
| 60 | – | – | – | 0.02 | – | 0.03 | – | – | – | – | – | 0.05 | ||
| 70 | – | – | – | – | – | 0.01 | – | 0.03 | – | 0.11 | – | 0.15 | ||
| 80 | – | – | – | – | – | 0.01 | – | 0.03 | – | 0.08 | 0.44 | 4.76 | ||
| 90 | – | – | – | – | – | 0.02 | – | 0.05 | 0.11 | 0.14 | 0.76 | – | ||
| 96 | – | – | – | – | – | 0.02 | – | 0.09 | 0.22 | 0.35 | 2.59 | – |
Hastelloy B3 Welding And Production
The Hastelloy B3 alloy is very suitable for the Gas Metal Arc (GMA/MIG), Gas Tungsten Arc (GTA/TIG), and Shielded Metal Arc (SMA/Stick) welding processes.
Unless otherwise stated, Hastelloy B3 alloy forged products are supplied in the annealed state. This solution is designed to optimize the alloy’s corrosion and ductility during the annealing procedure. After hot forming processes, the material is re-annealed to restore its optimal properties. Hastelloy B3 is re-annealed to achieve an outer fiber elongation of at least 7% after any cold forming process. The annealing temperature for the alloy is 1,066 °C (1,950 °F), and water cooling is recommended. Structures thinner than 10 mm (0.375 in) can be rapidly cooled with air. The waiting time at the annealing temperature depends on the structure’s thickness. Between 10 and 30 minutes is recommended.
While cold work generally does not affect the Hastelloy B3 alloy’s resistance to general corrosion, stress can affect its resistance to corrosion cracking. For optimal corrosion performance, it is important to re-anneal cold-machined parts.
Alloy B-3 UNS N10675 Application
Alloy B-3 (UNS N10675) is commonly used for manufacturing equipment and piping systems that operate under severe reducing corrosion conditions.
- Chemical industry: Hydrochloric acid reactors, evaporators, reboilers and transfer pipelines
- Petrochemical and oil & gas industry: Sour gas systems, downhole tools and pipelines for acidic fluid transport
- Pharmaceutical and fine chemical industry: Reactors and storage tanks for strong acid processing
- Flue gas desulfurization and waste liquid treatment: Scrubbers, heat exchangers and waste liquid pipelines
C&N supplies a full range of Alloy B-3 products and pipe fittings, with custom solutions available. Feel free to contact us if you have any inquiries about our Alloy B-3 products.
