Hastelloy B-2
Supplied by Huaxiao-Alloy – Your Trusted Global Alloy Partner
1. Introduction to Hastelloy B-2
Hastelloy B-2 is a nickel molybdenum alloy with excellent resistance to hydrochloric acid at all concentrations and temperatures. It also performs exceptionally well against other strong reducing agents such as hydrogen chloride, sulfuric acid, acetic acid, and phosphoric acid.
This alloy is widely used in the chemical process industry where extreme resistance to reducing environments is critical. Its low carbon and silicon content reduce the risk of carbide precipitation during welding, making it more reliable in fabrication compared with earlier B-series alloys.
At Huaxiao-Alloy, we provide Hastelloy B-2 in multiple forms, including plates, sheets, bars, pipes, fittings, and customized components. With strict quality control and ISO 9001 certification, we serve clients in chemical, petrochemical, energy, and environmental industries worldwide.
2. Chemical Composition of Hastelloy B-2
| Element | Typical wt.% | Function |
|---|---|---|
| Nickel (Ni) | Balance | Base element ensuring corrosion resistance |
| Molybdenum (Mo) | 26–30 | Enhances resistance to reducing acids |
| Iron (Fe) | 2–6 | Balancing element |
| Cobalt (Co) | ≤1 | Controlled to minimize variation |
| Chromium (Cr) | ≤1 | Kept low to prevent oxidizing weakness |
| Carbon (C) | ≤0.01 | Very low to avoid carbide precipitation |
| Silicon (Si) | ≤0.1 | Prevents embrittlement |
| Manganese (Mn) | ≤1 | Deoxidizer |
| Vanadium (V) | ≤0.35 | Strengthening |
The carefully controlled low chromium and carbon levels make Hastelloy B-2 particularly effective in reducing chemical environments.
3. Mechanical Properties of Hastelloy B-2
| Property | Typical Value |
|---|---|
| Density | 9.24 g/cm³ |
| Melting Range | 1330–1380 °C |
| Tensile Strength | 760–790 MPa |
| Yield Strength (0.2 percent offset) | 350–370 MPa |
| Elongation | 40–50 percent |
| Hardness | 85–90 HRB |
These properties demonstrate the alloy’s ability to combine strength, ductility, and toughness under aggressive conditions.
4. Key Features of Hastelloy B-2
Outstanding resistance to hydrochloric acid across a wide temperature and concentration range.
Excellent resistance to reducing chemicals such as sulfuric, phosphoric, and acetic acids.
Good performance in hydrogen chloride gas environments.
Low carbon and silicon content minimize risk of sensitization during welding.
Resistance to localized corrosion such as pitting and crevice corrosion in reducing conditions.
Easy to fabricate with standard industrial techniques.
5. Heat Treatment
Supplied in the solution-annealed condition.
Annealing temperature: 1060–1175 °C followed by rapid quenching.
This treatment ensures maximum corrosion resistance and restores ductility after cold work.
6. Applications of Hastelloy B-2
6.1 Chemical Processing
Reaction vessels and reactors handling hydrochloric acid.
Heat exchangers in sulfuric acid production.
Piping systems carrying highly reducing chemicals.
6.2 Petrochemical Industry
Equipment for catalyst regeneration and acid pickling lines.
Vessels in processing of chlorinated hydrocarbons.
6.3 Pollution Control
Components in waste acid treatment systems.
Scrubbers for chemical and gas cleaning applications.
6.4 Pharmaceuticals and Food Industry
Production facilities requiring high purity and corrosion resistance.
Storage tanks for aggressive chemical cleaning solutions.
6.5 Energy and Power Generation
Heat exchangers and condensers in acidic condensate environments.
Acid-resistant equipment in biofuel and biomass energy sectors.
7. Advantages of Hastelloy B-2
Superior hydrochloric acid resistance compared to most nickel alloys.
Long service life with minimal maintenance costs.
Reliable performance after welding and fabrication.
Flexible supply in a wide range of product forms.
Backed by Huaxiao-Alloy’s technical expertise and global logistics.
8. Limitations of Hastelloy B-2
Not recommended for oxidizing environments (e.g., ferric or cupric salts).
Limited resistance to strong oxidizing acids such as nitric acid.
Higher cost compared with stainless steels.
9. Comparison with Other Alloys
| Alloy | Strengths | Weaknesses | Typical Uses |
|---|---|---|---|
| Hastelloy B-2 | Excellent in hydrochloric acid, reducing environments | Poor in oxidizing environments | Chemical reactors, heat exchangers |
| Hastelloy B-3 | Improved thermal stability, better processability | Similar oxidizing limitations | Modern chemical plants |
| Hastelloy C-22 | Superior in oxidizing environments | Less effective in reducing acids | Waste treatment, pharmaceuticals |
| Hastelloy C-276 | Universal corrosion resistance | Slightly lower HCl resistance | Oil and gas, marine |
| Stainless Steel 316L | Cost-effective | Fails in hydrochloric acid | General chemical handling |
10. Standards and Specifications
UNS: N10665
W. Nr.: 2.4617
Standards:
ASTM B333 (Plate, Sheet, Strip)
ASTM B335 (Bar, Rod, Forging)
ASTM B622 (Seamless Pipe and Tube)
ASTM B619 (Welded Pipe)
ASTM B626 (Welded Tube)
ASTM B366 (Fittings)
11. Product Forms Supplied by Huaxiao-Alloy
Plates, sheets, and strips
Bars and rods
Seamless and welded tubes
Pipes and fittings
Welding wires and electrodes
Forgings and customized components
All products are supplied with mill test certificates and optional third-party inspection.
12. Fabrication and Processing
Forming: Can be hot formed at 870–1175 °C. Cold forming requires intermediate annealing.
Welding: Good weldability using GTAW, GMAW, or SMAW processes. Use filler metal of similar composition.
Machining: Requires rigid tooling and cooling due to work hardening.
Cleaning: Post-fabrication cleaning should avoid oxidizing agents.
13. Why Choose Huaxiao-Alloy for Hastelloy C-4
Global supplier of Hastelloy and other nickel alloys.
Comprehensive stock of Hastelloy B-2 in multiple forms.
Customized solutions including cutting, machining, and finishing.
ISO-certified quality system ensuring consistent reliability.
Technical experts available for consultation.
Competitive pricing and fast delivery worldwide.
📩 Contact us at [email protected]
📱 WhatsApp: +1 (579) 300-2733
It is mainly used in chemical processing equipment that requires excellent resistance to hydrochloric acid and other reducing chemicals.
It provides far superior corrosion resistance in reducing environments, where stainless steel fails rapidly.
Yes, it has good weldability. Proper filler metals and techniques help avoid defects.
No, it is not suitable for oxidizing acids such as nitric acid.
We supply plates, sheets, bars, pipes, fittings, wires, and custom parts.
15. Conclusion
Hastelloy B-2 is a high-performance nickel molybdenum alloy designed for service in strongly reducing environments. With its outstanding resistance to hydrochloric acid and other aggressive chemicals, it plays a critical role in the chemical process industry.
At Huaxiao-Alloy, we deliver Hastelloy B-2 with assured quality, technical expertise, and fast global supply. Whether you need raw stock or precision-engineered components, we are your trusted partner for demanding projects.
📩 Email: [email protected]
📱 WhatsApp: +1 (579) 300-2733
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