Hastelloy B3
Ultra-corrosion-resistant nickel-molybdenum superalloy for extreme reducing acid environments
Hastelloy B3 delivers unparalleled resistance to concentrated reducing acids including hydrochloric acid, phosphoric acid, and sulfuric acid at elevated temperatures. Engineered for mission-critical chemical processing and corrosive fluid handling where failure prevention is paramount.
Quick Specifications
- UNS Designation
- N10675
- Werkstoff Number
- 2.4600
- Form
- Ingot, Plate, Rod, Bar, Tube, Wire
- Tensile Strength (at 20°C)
- 690 - 860 MPa
- Yield Strength (0.2% Offset)
- 310 MPa minimum
- Elongation
- 20% minimum
Standards & Certifications
Product Description
Hastelloy B3 is a proprietary nickel-molybdenum superalloy engineered specifically to provide the most comprehensive corrosion resistance available for aggressive reducing acid environments. The advanced composition with high molybdenum content, chromium for broader corrosion resistance, and tungsten for enhanced strength delivers exceptional immunity to attack by hydrochloric acid, phosphoric acid, sulfuric acid, and mixed acidic media at temperatures approaching the alloy's melting point. This material represents the ultimate solution for chemical processing applications where any corrosion failure would result in catastrophic consequences.
The microstructure is carefully controlled through vacuum induction melting and electroslag remelting to ensure absolute cleanliness and optimal distribution of alloying elements. The resulting material exhibits remarkable resistance to both uniform corrosion and localized attack phenomena that plague lower-grade materials. Every Hastelloy B3 ingot undergoes rigorous quality verification including impact testing, mechanical property sampling, and chemical composition analysis to guarantee compliance with the most stringent specifications.
Hastelloy B3 is available in plate, rod, bar, tube, and wire forms to accommodate diverse equipment fabrication requirements. The material exhibits excellent weldability, compared to competing exotic alloys, though specialized techniques and filler materials are essential. The superior strength retention at elevated temperatures, combined with exceptional corrosion resistance, enables designers to create compact, efficient equipment that maximizes production capacity while minimizing capital investment.
With an unmatched service history in the world's most demanding chemical processing applications, from concentrated acid synthesis to hazardous waste processing, Hastelloy B3 stands as the benchmark standard for engineers who require absolute assurance of material integrity. The alloy's documented performance in applications where alternative materials failed within days or weeks demonstrates its uncompromising ability to deliver long-term, trouble-free service.
Specifications
| UNS Designation | N10675 |
| Werkstoff Number | 2.4600 |
| Form | Ingot, Plate, Rod, Bar, Tube, Wire |
| Tensile Strength (at 20°C) | 690 - 860 MPa |
| Yield Strength (0.2% Offset) | 310 MPa minimum |
| Elongation | 20% minimum |
| Density | 9.24 g/cm³ |
| Melting Point | 1260 - 1290°C |
| Thermal Conductivity at 100°C | 10.6 W/m·K |
| Modulus of Elasticity | 228 GPa at 20°C |
| Maximum Service Temperature | 815°C (continuous) |
| Corrosion Rate in 6M HCl | < 0.13 mm/year at 65°C |
Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Remainder (min 47) |
| Molybdenum (Mo) | 28.0 - 32.0 |
| Chromium (Cr) | 2.5 - 3.5 |
| Tungsten (W) | 2.4 - 3.3 |
| Iron (Fe) | ≤ 2.5 |
| Cobalt (Co) | ≤ 2.5 |
| Carbon (C) | ≤ 0.10 |
| Manganese (Mn) | ≤ 1.5 |
| Silicon (Si) | ≤ 1.0 |
| Sulfur (S) | ≤ 0.030 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength at 20°C | 690 - 860 MPa |
| Tensile Strength at 538°C | 480 - 620 MPa |
| Yield Strength (0.2% Offset) at 20°C | 310 MPa minimum |
| Yield Strength at 538°C | 240 MPa minimum |
| Elongation at 20°C | 20% minimum |
| Reduction of Area | 25% minimum |
| Hardness (As-cast) | 285 - 330 HV |
| Impact Strength (Charpy V) | ≥ 40 J at 20°C |
Key Features & Advantages
Applications
Chemical Processing Equipment
Manufacturing of reactor vessels, agitator shafts, internal baffles, and condenser tubes for handling concentrated phosphoric acid, nitric acid, and sulfuric acid where material integrity is critical to operational safety.
Wet Chlorine Processing
Fabrication of equipment and piping for handling wet chlorine gas, hydrochloric acid vapors, and related products in chlor-alkali plants where corrosive environments would destroy conventional materials within hours.
Pharmaceutical and Fine Chemical Synthesis
Construction of reactor systems, distillation columns, and process equipment for specialty chemical synthesis where purity requirements and severe corrosive conditions demand superior material performance.
Aggressive Waste Treatment Systems
Manufacturing of waste acid neutralization equipment, contaminated water processing vessels, and hazardous waste disposal systems where extreme corrosive conditions and mixed media require material with unmatched durability.
Oil Refining and Hydroprocessing
Fabrication of heat exchangers, reactor internals, and fractionation equipment in hydrocracking and hydrotreating units where exposure to hydrogen, sulfur compounds, and acidic media demands superior material integrity.
Mineral Acid Production
Manufacturing of contact sulfuric acid coolers, phosphoric acid process equipment, and hydrochloric acid handling systems where direct exposure to concentrated acids at elevated temperatures challenges all but the most advanced alloys.
Frequently Asked Questions
Why is Hastelloy B3 preferred over Inconel 686 for concentrated acid service?
What welding procedures are critical for maintaining Hastelloy B3 corrosion resistance?
Can Hastelloy B3 be machined, or must components be cast?
What is the typical corrosion rate of Hastelloy B3 in 6M hydrochloric acid?
Is Hastelloy B3 suitable for oxidizing acid environments like nitric acid?
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