Hastelloy B2 Supplier & Manufacturer

Hastelloy B2 is a wrought nickel-molybdenum alloy designed to provide exceptional resistance to hydrochloric acid across a wide range of concentrations and temperatures. The alloy contains very low carbon and silicon levels, significantly reducing carbide precipitation in weld heat-affected zones and improving corrosion resistance after welding.

Unlike stainless steels and many conventional nickel alloys, Hastelloy B2 performs exceptionally well in strongly reducing environments. It offers excellent resistance to pitting corrosion, crevice corrosion, stress corrosion cracking, and acid attack, making it one of the most reliable materials for severe chemical processing applications.

The alloy is widely used in reactors, pressure vessels, piping systems, heat exchangers, and process equipment handling hydrochloric acid, sulfuric acid, phosphoric acid, and other reducing chemicals.

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Features of Hastelloy B2

• Exceptional resistance to hydrochloric acid at all concentrations

• Excellent performance in reducing environments

• Outstanding resistance to pitting and crevice corrosion

• Superior resistance to chloride stress corrosion cracking

• Very low carbon and silicon content for improved weldability

• Excellent resistance to sulfuric, phosphoric, and acetic acids

• Good fabrication and forming characteristics

• Stable corrosion resistance in welded structures

• Long service life in severe chemical processing conditions

• Reliable performance in high-purity chemical applications

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Chemical Composition of Hastelloy B2

Element	Content (%)
Nickel (Ni)	Balance
Molybdenum (Mo)	26.0 – 30.0
Iron (Fe)	≤ 2.0
Chromium (Cr)	≤ 1.0
Cobalt (Co)	≤ 1.0
Manganese (Mn)	≤ 1.0
Silicon (Si)	≤ 0.10
Carbon (C)	≤ 0.02
Phosphorus (P)	≤ 0.04
Sulfur (S)	≤ 0.03

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Physical Properties

Property	Value
Density	9.22 g/cm³
Melting Range	1330 – 1380°C
Electrical Resistivity	1.37 μΩ·m
Thermal Conductivity	10.5 W/m·K
Specific Heat Capacity	419 J/kg·K
Modulus of Elasticity	206 GPa

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Mechanical Properties

Property	Value
Tensile Strength	≥ 760 MPa
Yield Strength (0.2% Offset)	≥ 350 MPa
Elongation	≥ 40%
Hardness	≤ 100 HRB

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Corrosion Resistance

Hastelloy B2 is considered one of the best materials available for handling hydrochloric acid. Its high molybdenum content provides excellent resistance to corrosion in reducing media where stainless steels and many nickel alloys are unsuitable.

The alloy demonstrates outstanding resistance to hydrochloric acid, sulfuric acid under reducing conditions, phosphoric acid, acetic acid, and hydrogen chloride gas. It also offers exceptional protection against pitting corrosion, crevice corrosion, and chloride-induced stress corrosion cracking.

However, Hastelloy B2 is not recommended for strongly oxidizing environments containing ferric salts, cupric salts, nitric acid, or oxygen-rich solutions. In such conditions, Hastelloy C276 is generally the preferred material.

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High Temperature Performance

Property	Performance
Recommended Continuous Service Temperature	Up to approximately 650°C
Thermal Stability	Good
Oxidation Resistance	Limited
Reducing Atmosphere Resistance	Excellent

Although Hastelloy B2 is primarily selected for corrosion resistance rather than elevated-temperature strength, it maintains stable mechanical properties in moderately high-temperature reducing environments.

For applications involving severe oxidation or prolonged exposure to temperatures above 650°C, alloys such as Hastelloy C276, Inconel 625, or Haynes 230 may provide superior performance.

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Available Forms

J&A Alloy supplies Hastelloy B2 in a complete range of mill products and custom-engineered forms, including:

Product Form	Availability
Pipe	Seamless / Welded
Tube	Seamless / Welded
Plate	Available
Sheet	Available
Bar	Round / Flat / Hex
Rod	Available
Forging	Available
Flange	Available
Pipe Fittings	Available
Custom Machined Components	Available Upon Request

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Applications of Hastelloy B2

Hastelloy B2 is widely used in industries that require reliable resistance to hydrochloric acid and reducing chemical environments.

Typical applications include:

Chemical Processing Equipment

Hydrochloric Acid Production Systems

Pharmaceutical Manufacturing Facilities

Petrochemical Processing Units

Acid Regeneration Plants

Pressure Vessels

Chemical Reactors

Heat Exchangers

Storage Tanks

Scrubbers

Pollution Control Equipment

Agrochemical Processing Systems

Specialty Chemical Manufacturing Plants

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Hastelloy B2 vs Other Alloys

Property	Hastelloy B2	Hastelloy C276	Incoloy 825	316L Stainless Steel
Hydrochloric Acid Resistance	Excellent	Very Good	Moderate	Poor
Oxidizing Acid Resistance	Poor	Excellent	Good	Moderate
Pitting Resistance	Excellent	Excellent	Good	Moderate
Crevice Corrosion Resistance	Excellent	Excellent	Good	Moderate
Stress Corrosion Cracking Resistance	Excellent	Excellent	Very Good	Poor
Reducing Acid Service	Excellent	Very Good	Good	Poor
Maximum Corrosion Versatility	Moderate	Excellent	Good	Moderate
Relative Cost	High	High	Medium	Low

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Welding & Fabrication

Hastelloy B2 can be fabricated using conventional nickel alloy processing methods and offers excellent weldability when proper procedures are followed.

Recommended welding processes include GTAW (TIG), GMAW (MIG), SMAW, and Plasma Arc Welding. Filler metals such as ERNiMo-7 or matching Hastelloy B2 consumables are commonly used.

The alloy exhibits excellent cold-forming and hot-working characteristics. Due to its low carbon and silicon content, welded joints maintain excellent corrosion resistance and are less susceptible to heat-affected zone attack.

During fabrication, contamination from iron, sulfur, or oxidizing compounds should be avoided to preserve corrosion performance.

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Standards & Equivalent Grades

Standard	Designation
UNS	N10665
Werkstoff Number	2.4617
ASTM Pipe	B622
ASTM Tube	B619 / B622
ASTM Plate, Sheet & Strip	B333
ASTM Bar & Rod	B335
ASME Pipe	SB622
ASME Plate	SB333
ASME Bar	SB335
Trade Name	Hastelloy B2

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Frequently Asked Questions

What is Hastelloy B2 used for?

Hastelloy B2 is primarily used in hydrochloric acid processing systems, chemical reactors, heat exchangers, pressure vessels, storage tanks, and piping systems exposed to highly reducing chemicals.

What makes Hastelloy B2 different from Hastelloy C276?

Hastelloy B2 provides superior resistance in pure reducing environments, especially hydrochloric acid. Hastelloy C276 offers broader corrosion resistance in both reducing and oxidizing environments.

Is Hastelloy B2 resistant to hydrochloric acid?

Yes. Hastelloy B2 is specifically designed to provide outstanding resistance to hydrochloric acid over a wide range of concentrations and temperatures.

Can Hastelloy B2 be welded?

Yes. Hastelloy B2 offers excellent weldability and maintains corrosion resistance in welded structures when appropriate welding procedures are used.

Is Hastelloy B2 resistant to chloride stress corrosion cracking?

Yes. The alloy provides excellent resistance to chloride-induced stress corrosion cracking, making it suitable for severe chemical service environments.

What industries commonly use Hastelloy B2?

Chemical processing, petrochemical, pharmaceutical, agrochemical, pollution control, and specialty chemical industries are among the major users of Hastelloy B2.

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Why Choose J&A Alloy

Specialized Nickel Alloy Expertise

J&A Alloy focuses on supplying high-performance nickel alloys and corrosion-resistant materials for demanding industrial applications worldwide.

Strict Quality Assurance

All Hastelloy B2 products are supplied with EN 10204 3.1 Mill Test Certificates and can be provided with PMI testing, chemical analysis reports, mechanical testing reports, dimensional inspections, and non-destructive testing upon request.

Complete Product Portfolio

We supply pipes, tubes, plates, sheets, bars, rods, forgings, flanges, fittings, and custom-machined components to meet diverse project requirements.

Global Supply Capability

J&A Alloy serves customers across North America, Europe, the Middle East, Southeast Asia, South America, and Africa with reliable logistics and responsive support.

Professional Technical Support

Our alloy specialists assist customers with material selection, corrosion evaluation, fabrication guidance, specification compliance, and project optimization.