Seamless Hastelloy B3 Nickel Alloy Pipe (UNS N10675, DIN 2.4600) stands as a pinnacle of nickel-molybdenum alloy engineering, meticulously designed to excel in the most aggressive reducing environments. With a nickel content of ≥65.00% and a molybdenum range of 27.00–32.00%, this alloy surpasses its predecessors, such as Hastelloy B-2, by offering unparalleled thermal stability and corrosion resistance. Its composition addresses the limitations of earlier alloys, eliminating intermetallic phase precipitation during welding or high-temperature service to ensure consistent performance.
Manufactured to rigorous standards including ASTM B161, ASTM B163, and ASTM B622, Hastelloy B-3 seamless pipes undergo a precision seamless production process. This ensures uniform wall thickness, exceptional mechanical properties, and reliability in applications where failure is not an option—from chemical processing plants to marine engineering. Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. delivers these pipes with strict quality control, guaranteeing solutions for the most demanding industrial challenges.
| Grade | Ni | Cr | Mo | Fe | W | C | Si | Co | Mn | V | P | Ti | Cu | Al | Zr | Cb(Nb) | Ta | Ni+Mo |
| N10675 | ≥65.00 | 1.00–3.00 | 27.00–32.00 | 1.00–3.00 | ≤3.00 | ≤0.01 | ≤0.10 | ≤3.00 | ≤3.00 | ≤0.20 | ≤0.03 | ≤0.20 | ≤0.20 | ≤0.50 | ≤0.10 | ≤0.20 | ≤0.20 | 94.00–98.00 |
| Grade | Tensile Strength (ksi/MPa) | Yield Strength (ksi/MPa) | Elongation (%) |
| N10675 | ≥110/760 | ≥51/350 | ≥40 |
| Property | Value |
| Density | 9.24 g/cm³ |
| Melting Point | 1370–1410°C |
| Thermal Conductivity | 10.2 W/m·K (100°C) |
| Electrical Resistivity | 138 μΩ·cm |
| Thermal Expansion | 13.2 μm/m·°C (20–100°C) |
| Elastic Modulus | 210 GPa |
Hastelloy B-3 redefines durability in reducing environments:
Hydrochloric Acid (HCl): Resistant to all concentrations and temperatures, making it ideal for HCl synthesis, storage, and transport.
Sulfuric Acid (H₂SO₄): Maintains integrity in sulfuric acid systems, even at elevated temperatures up to 200°C.
Diverse Acid Resistance: Withstands acetic, formic, and phosphoric acids, as well as non-oxidizing salts and organic compounds.
Compared to Hastelloy B-2, B-3 features a refined chemical composition that minimizes intermetallic phase formation during welding or prolonged high-temperature use. This stability ensures:
Consistent corrosion resistance in heat-affected zones
Reduced risk of embrittlement in service temperatures up to 1200°C
Reliable performance in cyclic thermal environments
The alloy’s high molybdenum content and balanced chemistry provide exceptional resistance to:
SCC in chloride-containing media
Pitting and crevice corrosion in low-pH environments
Knife-line attack during welding operations
Hastelloy B-3 supports seamless integration into complex systems:
Weldable via TIG, MIG, and stick welding with nickel-based fillers
Formable via cold working techniques, with post-work annealing to restore ductility
Machinable with standard tooling, though slow speeds and high lubrication are recommended
Acid Production: Reactors, pipelines, and tanks for HCl, H₂SO₄, and phosphoric acid manufacturing.
Hydrocarbon Processing: Equipment for hydrocracking, desulfurization, and hydrogenation units.
Synthetic Fibers & Pharmaceuticals: Corrosion-resistant components for chemical synthesis and purification.
Flue Gas Desulfurization (FGD): Scrubbers, heat exchangers, and ducts in coal-fired power plants.
Geothermal Systems: Tubing and valves for high-temperature, acidic brine applications.
Nuclear Facilities: Components in spent fuel processing and radioactive acid handling.
Seawater Handling: Pumps, heat exchangers, and desalination plant infrastructure.
Offshore Oil & Gas: Subsea pipelines and wellheads exposed to corrosive hydrocarbons.
Bleaching Processes: Digesters, chlorine dioxide reactors, and bleach plant piping.
Chemical Pulping: Equipment for handling sulfurous acids and alkaline solutions.
Hastelloy B-3 features a refined chemistry that eliminates the intermetallic phase precipitation common in B-2, offering superior thermal stability and resistance to heat-affected zone corrosion. This makes B-3 more reliable for welded structures and long-term high-temperature service.
No—B-3 is optimized for reducing media. For oxidizing acids (e.g., nitric acid) or chloride solutions, consider Hastelloy C-276 or C-22.
Hastelloy B-3 maintains corrosion resistance up to ~1200°C in non-oxidizing atmospheres. In acidic media, its service temperature depends on concentration (e.g., up to 200°C in 50% H₂SO₄).
No, it is non-magnetic, making it suitable for applications requiring non-magnetic components, such as sensors or medical equipment.
Use low-heat-input techniques (e.g., TIG) with filler metals like ERNiMo-13. Preheat and post-weld heat treatment are rarely needed, but annealing can improve ductility for critical parts.
Standard pickling or bright annealing is sufficient for most uses. Polishing may be applied for aesthetic purposes or to minimize crevice corrosion in hygienic applications.
All products come with mill test certificates. 3.2 Certification (EN 10204) is available upon request for compliance with European standards.
