HASTELLOY C276 (UNS N10276) is a highly versatile nickel-molybdenum-chromium alloy renowned for its exceptional corrosion resistance in a wide range of severe environments. This article provides a detailed and rich introduction to HASTELLOY C276, covering 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.
Chemical Composition
Element
Composition (%)
Nickel (Ni)
57.0 min
Chromium (Cr)
14.5 – 16.5
Molybdenum (Mo)
15.0 – 17.0
Iron (Fe)
4.0 – 7.0
Tungsten (W)
3.0 – 4.5
Cobalt (Co)
2.5 max
Manganese (Mn)
1.0 max
Vanadium (V)
0.35 max
Silicon (Si)
0.08 max
Carbon (C)
0.010 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)
52 (355) min
Elongation (% in 2 inches)
40 min
Hardness, Rockwell C (HRC)
28 – 36
Performance at Different Temperatures
HASTELLOY C276 exhibits excellent performance across varying temperature ranges:
Room Temperature: Superior resistance to corrosive media including oxidizing and reducing environments.
Elevated Temperatures: Maintains high strength and corrosion resistance up to 2000°F (1093°C).
Low Temperatures: Retains ductility and toughness at cryogenic temperatures, suitable for extreme environments.
Industry Applications
HASTELLOY alloy C276 is widely used in several industries due to its exceptional corrosion resistance:
Industry Sector
Applications
Chemical Processing
Reactors, heat exchangers, and piping systems handling acids, chlorides, and other corrosive chemicals.
Petrochemical
Equipment for sulfuric acid production, pollution control, and chemical processing units.
Oil and Gas
Components exposed to sour gas environments containing hydrogen sulfide.
Pharmaceutical
Pharmaceutical processing equipment requiring resistance to aggressive chemicals.
Shapes, Sizes, and Production Standards
Product Form
Shapes Available
Sizes Available
Production Standards
Sheets/Plates
Plates, Sheets
Thickness: 0.025″ – 1.000″ (0.64mm – 25.4mm)
ASTM B575
Bars
Round bars, hexagonal bars
Diameter: 0.25″ – 6.0″ (6.35mm – 152.4mm)
ASTM B574
Tubes/Pipes
Seamless tubes, welded pipes
OD: 0.5″ – 6.0″ (12.7mm – 152.4mm)
ASTM B622, ASTM B619
Standards and Corresponding Grades
Country/Region
Standard/Grade
USA
UNS N10276
Europe
2.4819
Germany
NiMo16Cr15W
France
NC17D
Welding, Processing, Polishing, Heat Treatment
Process
Details
Welding
Excellent weldability using TIG, MIG methods, ensuring strong and reliable joints in corrosive environments.
Processing
Machinable using conventional methods, offering flexibility in fabrication processes.
Polishing
Capable of achieving smooth finishes for enhanced corrosion resistance and aesthetic appeal.
Heat Treatment
Annealing at 2050°F (1121°C) followed by rapid quenching optimizes material properties and performance.
Cold Processing, Advantages, and Disadvantages
Aspect
Details
Cold Processing
Retains ductility and formability at room temperature, facilitating shaping and fabrication.
Advantages
Exceptional resistance to a wide range of corrosive chemicals, high mechanical strength, and reliability in harsh environments.
Disadvantages
Higher initial cost compared to conventional stainless steels, limited availability of specific shapes and sizes.
Similar Products
Product Name
Comparison
HASTELLOY C-22 (UNS N06022)
Comparable corrosion resistance, with higher chromium and tungsten content in C-22 providing improved resistance to oxidizing media.
INCONEL 625 (UNS N06625)
Lower molybdenum content, suitable for moderate to high temperature applications but with lower overall corrosion resistance compared to C276.
Comparison of Similar Products
Property/Feature
Hastelloy C276
Hastelloy C-22
INCONEL 625
Nickel Content (%)
57.0
56.0
61.0
Molybdenum Content (%)
15.0 – 17.0
12.5 – 14.5
8.0 – 10.0
Chromium Content (%)
14.5 – 16.5
20.0 – 22.5
20.0 – 23.0
Tensile Strength (ksi)
110 min
115 min
120 min
Yield Strength (ksi)
52 min
55 min
60 min
Corrosion Resistance
Excellent in a wide range of corrosive environments, including strong oxidizers and reducing agents.
Excellent in oxidizing and reducing acids, including sulfuric, hydrochloric, and acetic acid.
Good resistance to oxidation and corrosion in high-temperature environments.
This comprehensive article provides a detailed introduction to HASTELLOY C276 (UNS N10276), covering its chemical composition, mechanical properties, performance in various environments, industry applications, available forms and sizes, production standards, welding and processing capabilities, as well as advantages, disadvantages, and comparisons with similar alloys. The structured format using tables ensures clarity and accessibility of technical information, catering to engineers, manufacturers, and professionals seeking corrosion-resistant materials for demanding applications.
