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HASTELLOY B-3 ALLOY B-3 UNS N10675 2.4600 NICKEL ALLOY SEAMLESS PIPE AND TUBE

HASTELLOY UNS N10675 2.4600 NICKEL ALLOY SEAMLESS PIPE

①　STANDARD: ASTM B161/ ASTM B163/ ASTM B167/ ASTM B444/ ASTM B622 ...
②　OD RANGE : 6-457 MM
③　THICKNESS RANGE: 1-45 MM

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Introduction

Product Introduction

Hastelloy B-3 (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.

Main Product Parameters

Chemical Composition

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

Mechanical Properties

Grade	Tensile Strength (ksi/MPa)	Yield Strength (ksi/MPa)	Elongation (%)
N10675	≥110/760	≥51/350	≥40

Physical Properties

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

Dimensions

Outer Diameter: 6–457 mm
Wall Thickness: 1–45 mm
Custom lengths available upon request

Product Features

Unmatched Corrosion Resistance in Reducing Media

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.

Enhanced Thermal Stability

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

Superior Stress Corrosion Cracking (SCC) Resistance

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

Versatile Fabrication and Weldability

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

Application Scenarios

Chemical & Petrochemical Industry

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.

Energy & Power Generation

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.

Marine & Desalination

Seawater Handling: Pumps, heat exchangers, and desalination plant infrastructure.
Offshore Oil & Gas: Subsea pipelines and wellheads exposed to corrosive hydrocarbons.

Paper & Pulp Manufacturing

Bleaching Processes: Digesters, chlorine dioxide reactors, and bleach plant piping.
Chemical Pulping: Equipment for handling sulfurous acids and alkaline solutions.

Aerospace & High-Temperature Engineering

Corrosion-Resistant Components: Fuel systems and exhaust components in aircraft engines.
Heat Treatment Equipment: Furnace parts and high-temperature fixtures.

FAQ

What distinguishes Hastelloy B-3 from B-2?

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.

Can Hastelloy B-3 be used in oxidizing environments?

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.

What is the maximum temperature for Hastelloy B-3?

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).

Is Hastelloy B-3 magnetic?

No, it is non-magnetic, making it suitable for applications requiring non-magnetic components, such as sensors or medical equipment.

How should Hastelloy B-3 be welded?

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.

Does Hastelloy B-3 require special surface treatment?

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.