HASTELLOY alloy B-2 (UNS N10665) is a nickel-molybdenum alloy known for its excellent resistance to reducing acids such as hydrochloric acid, sulfuric acid, and phosphoric acid. It offers robust mechanical properties and reliability across a wide range of temperatures, making it suitable for various demanding applications in corrosive environments.
Chemical Composition
Element
Composition (%)
Nickel (Ni)
65.0 min
Molybdenum (Mo)
26.0 – 30.0
Iron (Fe)
2.0 max
Chromium (Cr)
1.0 max
Cobalt (Co)
1.0 max
Manganese (Mn)
1.0 max
Silicon (Si)
0.10 max
Carbon (C)
0.02 max
Phosphorus (P)
0.040 max
Sulfur (S)
0.030 max
Mechanical Properties
Property
Value
Tensile Strength, ksi (MPa)
110 (760) min
Yield Strength (0.2% offset), ksi (MPa)
51 (350) min
Elongation (% in 2 inches)
40 min
Hardness, Rockwell B (HRB)
88 max
Performance at Different Temperatures
HASTELLOY B-2 demonstrates reliable performance across various temperature ranges:
Room Temperature: Offers outstanding resistance to reducing acids, ensuring longevity in chemical processing equipment.
Elevated Temperatures (up to 1000°F / 538°C): Maintains high strength and corrosion resistance in challenging industrial environments.
Low Temperatures: Retains ductility and toughness even at cryogenic temperatures, suitable for applications requiring resilience in extreme conditions.
Industry Applications
HASTELLOY alloy B-2 finds widespread use in several key industries:
Industry Sector
Applications
Chemical Processing
Reactor vessels, heat exchangers, and piping systems handling aggressive acids like sulfuric, hydrochloric, and phosphoric acids.
Petrochemical
Equipment for processing acids and chemicals in refineries and chemical plants.
Pharmaceutical
Pharmaceutical processing equipment requiring corrosion resistance to acids.
Pulp and Paper
Digesters, bleach plants, and equipment for corrosive chemical environments in paper production.
Shapes, Sizes, and Production Standards
Product Form
Shapes Available
Sizes Available
Production Standards
Sheets
Plates, Sheets
Thickness: 0.025″ – 4.000″ (0.64mm – 101.6mm)
ASTM B333
Bars
Round bars, hexagonal bars
Diameter: 0.25″ – 4.0″ (6.35mm – 101.6mm)
ASTM B335
Tubes/Pipes
Seamless tubes, welded pipes
OD: 0.5″ – 8.0″ (12.7mm – 203.2mm)
ASTM B619, ASTM B622
Standards and Corresponding Grades
Country/Region
Standard/Grade
USA
UNS N10665
Europe
2.4617
Germany
NiMo28
France
NiMo28
Welding, Processing, Polishing, Heat Treatment
Process
Details
Welding
Excellent weldability using TIG, MIG methods, suitable for joining components in corrosive environments without compromising integrity.
Processing
Machinable using conventional methods, offers flexibility in fabrication processes to meet specific design requirements.
Polishing
Capable of achieving smooth finishes for enhanced corrosion resistance, critical in applications requiring sanitary conditions.
Heat Treatment
Solution annealing at 1950°F (1065°C) followed by rapid quenching ensures optimal material properties and performance under stress.
Cold Processing, Advantages, and Disadvantages
Aspect
Details
Cold Processing
Retains ductility and formability at room temperature, facilitating shaping and forming processes in manufacturing.
Advantages
Exceptional resistance to reducing acids, high mechanical strength, and reliability in aggressive chemical environments.
Disadvantages
Higher initial cost compared to conventional stainless steels, limited availability in certain shapes and sizes may require custom fabrication solutions.
Similar Products
Product Name
Comparison
HASTELLOY Alloy C-276 (UNS N10276)
Higher molybdenum content, broader corrosion resistance in severe environments, suitable for a wider range of chemicals.
HASTELLOY Alloy B-3 (UNS N10675)
Enhanced thermal stability, superior resistance to hydrochloric acid and other strong acids, ideal for applications requiring extended service life in aggressive chemical environments.
Comparison of Similar Products
Property/Feature
HASTELLOY Alloy B-2 (UNS N10665)
HASTELLOY Alloy C-276 (UNS N10276)
HASTELLOY Alloy B-3 (UNS N10675)
Nickel Content (%)
65.0 min
57.0
65.0
Molybdenum Content (%)
26.0 – 30.0
16.0
28.0
Chromium Content (%)
1.0 max
16.0
1.5
Tensile Strength (ksi)
110 min
100 min
110 min
Yield Strength (ksi)
51 min
40 min
40 min
Corrosion Resistance
Excellent in reducing environments, withstands sulfuric, hydrochloric, and phosphoric acids.
Wide range of corrosive environments, excellent resistance to oxidizing and reducing acids.
Exceptional resistance to strong acids including hydrochloric acid, sulfuric acid, and other harsh chemicals.
This article provides a comprehensive overview of HASTELLOY alloy B-2 (UNS N10665), highlighting its chemical composition, mechanical properties, performance characteristics at different temperatures, industry applications, available shapes and sizes, production standards, welding and processing capabilities, as well as advantages, disadvantages, and comparisons with similar products. Each section is presented in a structured table format to ensure clarity and accessibility of technical information, catering to engineers, manufacturers, and professionals in the chemical and industrial sectors.
