# Hastelloy B Alloy UNS N10001: Properties and Applications
## Introduction to Hastelloy B Alloy UNS N10001
Hastelloy B alloy, also known as UNS N10001, is a nickel-molybdenum alloy renowned for its exceptional resistance to hydrochloric acid and other reducing chemicals. Developed by Haynes International, this alloy is part of the Hastelloy family, which is widely recognized for its corrosion-resistant properties in harsh environments.
## Chemical Composition
Keyword: HastelloyB UNS N10001
The chemical composition of Hastelloy B alloy plays a crucial role in its performance:
Nickel (Ni): 62% min
Molybdenum (Mo): 26-30%
Iron (Fe): 4-6%
Chromium (Cr): 0.5-1.5%
Manganese (Mn): 0.5-1.5%
Silicon (Si): 0.5-1.0%
Carbon (C): 0.05% max
Cobalt (Co): 2.5% max
## Physical Properties
Mechanical Properties
Tensile Strength: 690 MPa (100 ksi) min
Yield Strength: 310 MPa (45 ksi) min
Elongation: 40% min
Thermal Properties
Melting Range: 1330-1380°C (2425-2515°F)
Thermal Conductivity: 10.1 W/m·K at 100°C
Specific Heat Capacity: 427 J/kg·K at 25°C
## Corrosion Resistance
Hastelloy B alloy exhibits outstanding resistance to a wide range of corrosive environments:
– Excellent resistance to hydrochloric acid at all concentrations and temperatures
– Good resistance to sulfuric, phosphoric, and acetic acids
– Resistant to chloride-induced stress corrosion cracking
– Performs well in reducing environments but has limited resistance to oxidizing conditions
## Applications of Hastelloy B Alloy
Due to its unique properties, Hastelloy B alloy finds applications in various industries:
Chemical Processing
– Reactors and vessels handling hydrochloric acid
– Piping systems for corrosive chemical transport
– Heat exchangers in aggressive environments
Pharmaceutical Industry
– Equipment for acid production and handling
– Reaction vessels for specialty chemical synthesis
Other Applications
– Pollution control equipment
– Pulp and paper processing
– Waste treatment systems
## Fabrication and Welding
Hastelloy B alloy can be fabricated using standard techniques, though some considerations apply:
– Hot working should be performed between 870-1200°C (1600-2200°F)
– Cold working requires intermediate annealing
– Welding can be performed using matching filler metals (ERNiMo-7)
– Post-weld heat treatment is recommended for optimal corrosion resistance
## Comparison with Other Hastelloy Alloys
While Hastelloy B excels in reducing environments, other alloys may be better suited for different conditions:
– Hastelloy C-276: Better for oxidizing conditions and mixed acids
– Hastelloy X: Higher temperature strength and oxidation resistance
– Hastelloy B-2: Improved thermal stability and reduced carbide precipitation
## Conclusion
Hastelloy B alloy U