Alloy B-2，Hastelloy B-2 Rod，

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Alloy B-2 (Hastelloy B-2 Wire) - Introduction with Composition, Properties, Applications and Product Forms

Alloy B-2, commercially known as Hastelloy B-2, is a nickel-molybdenum superalloy celebrated for its exceptional resistance to reducing environments, particularly in concentrated hydrochloric acid, along with good high-temperature strength and excellent fabricability. This high-performance material is available in a comprehensive range of forms to meet diverse industrial needs, including Bar (Round bar, Flat bar), Ribbon, Wire, Rods, Tube, Pipe, Foil, Plate, Sheet, Strip, and Forging Stock. Hastelloy B-2 Wire, in particular, offers unique flexibility for intricate applications requiring corrosion resistance in aggressive chemical environments, such as chemical processing and pharmaceutical manufacturing. Below is a detailed overview of its chemical composition, key properties, practical applications, and available product forms.

Chemical Composition

The precisely engineered chemical composition of Alloy B-2 (Hastelloy B-2) is the foundation of its superior performance in reducing and corrosive environments. The typical composition (by weight) is as follows:

Nickel (Ni): 65-70% (primary matrix element, providing a stable base for corrosion resistance and structural integrity)

Molybdenum (Mo): 26-30% (a critical component for resistance to reducing acids, particularly hydrochloric acid, and enhancing high-temperature strength)

Iron (Fe): 1.0-2.0% (improves fabricability and mechanical stability at ambient temperatures)

Cobalt (Co): ≤ 2.0% (aids in solid solution strengthening and thermal stability)

Carbon (C): ≤ 0.02% (strictly controlled to minimize carbide formation, preventing intergranular corrosion in high-temperature service)

Silicon (Si): ≤ 0.1% (minimized to reduce the risk of forming brittle intermetallic phases)

Manganese (Mn): ≤ 1.0% (assists in deoxidation during manufacturing and improves weldability)

Trace elements: Phosphorus (P) ≤ 0.04%, Sulfur (S) ≤ 0.03% (kept low to ensure weldability and grain boundary strength)

This balanced composition synergistically delivers the alloy's signature resistance to reducing acids, high-temperature stability, and formability, making it ideal for extreme chemical processing environments.

Key Properties

Alloy B-2 (Hastelloy B-2 Wire) and its various forms exhibit a robust set of properties that make them indispensable in corrosive and high-temperature applications:

Mechanical Properties (room temperature, annealed condition):

Tensile strength: 690-820 MPa (100,000-119,000 psi)

Yield strength (0.2% offset): 310-400 MPa (45,000-58,000 psi)

Elongation (in 50 mm): 40-50% (excellent ductility, enabling complex forming and welding across all product forms)

Hardness: 180-220 HB (Brinell hardness, indicating good machinability)

High-Temperature Performance:

Thermal stability: Maintains significant strength up to 800°C (1472°F), with tensile strength remaining above 300 MPa at 650°C (1202°F)

Creep resistance: Exhibits good creep resistance at 500-700°C (932-1292°F), suitable for long-term service under sustained stress in chemical processing systems

Oxidation resistance: Moderate resistance to oxidation in air up to 650°C (1202°F); performance decreases in strongly oxidizing environments at higher temperatures

Thermal fatigue resistance: Good resistance to thermal cycling, making it suitable for applications with frequent temperature fluctuations

Corrosion Resistance:

Reducing acids: Exceptional resistance to concentrated hydrochloric acid, hydrobromic acid, and other reducing acids, even at elevated temperatures

Chemical resistance: Resistant to sulfuric acid (dilute to moderate concentrations), phosphoric acid, and organic acids; less suitable for strong oxidizing acids (e.g., nitric acid)

Wet corrosion: Resistant to seawater, brines, and alkaline solutions, though not recommended for highly oxidizing saltwater environments

Stress corrosion cracking (SCC): Highly resistant to SCC in reducing environments, including chloride-containing solutions under moderate stress

Physical Properties:

Density: 9.2 g/cm³ (0.332 lb/in³)

Thermal conductivity: 10 W/(m·K) at 20°C (68°F), increasing to 18 W/(m·K) at 800°C (1472°F)

Melting point: 1330-1380°C (2426-2516°F)

Coefficient of thermal expansion: 12.3 μm/(m·K) (20-100°C), rising to 16.8 μm/(m·K) at 800°C (1472°F)

Modulus of elasticity: 210 GPa (30,500 ksi) at room temperature, decreasing to 160 GPa (23,200 ksi) at 800°C (1472°F)

Product Forms

Alloy B-2 (Hastelloy B-2) is manufactured in a diverse range of forms to accommodate specialized industrial processes, particularly in chemical and pharmaceutical sectors:

Bar: Available as Round bar (diameters from 8 mm to 300 mm) and Flat bar (thickness 6 mm to 150 mm, width 20 mm to 600 mm), ideal for machining into valve components, pump shafts, and high-temperature fasteners.

Ribbon: Thin, flat strips (thickness 0.1 mm to 2 mm, width 5 mm to 100 mm) used in electrical heating elements and seals for corrosive chemical equipment.

Wire: Hastelloy B-2 Wire (diameters 0.05 mm to 10 mm) offers excellent flexibility for forming thermocouple sheaths, sensor leads, and woven mesh for filtration in aggressive chemical environments.

Rods: Solid cylindrical rods (diameters 3 mm to 50 mm) suitable for structural supports in chemical reactors and high-temperature processing equipment.

Tube and Pipe: Seamless and welded options (outer diameter 6 mm to 200 mm, wall thickness 0.5 mm to 20 mm) for transporting corrosive fluids, including concentrated acids, in chemical processing systems.

Foil: Ultra-thin sheets (thickness 0.01 mm to 0.1 mm) used in lightweight corrosion barriers and liners for precision chemical instruments.

Plate and Sheet: Flat forms (plate: thickness 5 mm to 100 mm; sheet: 0.3 mm to 5 mm) for fabricating reactor vessel liners, storage tanks, and heat exchanger panels.

Strip: Narrow, flat strips (thickness 0.1 mm to 3 mm, width 10 mm to 200 mm) for precision manufacturing in gaskets, seals, and electrical components for corrosive systems.

Forging Stock: Billets and ingots for hot forging into complex shapes such as pump impellers, valve bodies, and reactor internals for aggressive chemical service.

Applications

The exceptional properties of Alloy B-2 (Hastelloy B-2 Wire) across its various forms make it a critical material in industries requiring resistance to reducing acids and corrosive environments:

Chemical Processing:

Acid production and handling: Tanks, pipes, and valves (from plate, tube, and bar) for processing and transporting hydrochloric acid, hydrobromic acid, and other reducing acids.

Pharmaceutical manufacturing: Equipment for producing high-purity chemicals, including reaction vessels (from plate) and transfer lines (from tube), ensuring product purity and corrosion resistance.

Pesticide and fertilizer production: Components exposed to aggressive chemicals, such as agitators (from forging stock) and filtration systems (from wire mesh).

Petrochemical and Oil & Gas:

Refining: Equipment for handling sour gases and acidic hydrocarbons, including heat exchanger tubes (from tube) and separator vessels (from plate).

Downhole equipment: Components for wells producing acidic hydrocarbons, such as liners (from sheet) and tooling (from bar).

Gas processing: Scrubbers and separators (from plate and sheet) for removing acidic contaminants from natural gas.

Industrial and Environmental:

Wastewater treatment: Equipment for neutralizing and processing acidic waste streams, including tanks (from plate) and pumps (from forging stock).

Metallurgical processing: Crucibles and electrolytic cells (from plate and sheet) for handling molten metals and acidic electrolytes.

Mining chemicals: Components for leaching processes involving hydrochloric acid, such as agitators (from rod) and piping (from tube).

Specialized Applications by Form:

Wire: Thermocouple sheaths in acid reactors, sensor leads in chemical plants, and woven filters for acid filtration.

Tube/Pipe: Acid transport lines, heat exchanger tubes in chemical processing, and sampling lines for corrosive fluids.

Plate/Sheet: Reactor vessel liners, storage tank walls, and corrosion-resistant panels in chemical plants.

Bar/Rod: Machined valves, pump shafts, and fasteners for corrosive chemical processing equipment.

In summary, Alloy B-2 (Hastelloy B-2 Wire) — available in forms from Bar and Wire to Plate and Forging Stock — delivers exceptional resistance to reducing acids, high-temperature stability, and versatility. Its diverse product forms enable tailored solutions across chemical processing, petrochemical, and industrial sectors, establishing it as a critical material in extreme corrosive environments.

Packing of Standard Packing: 

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 2860 gallon liquid totes Special package is available on request.