Super Alloy HASTELLOY® G™ (UNS N06007) Product Introduction
HASTELLOY® G™ (UNS N06007) is a highly corrosion-resistant nickel-chromium-iron-molybdenum alloy designed for extreme environments where resistance to oxidizing and reducing acids is critical. This article provides a comprehensive introduction to HASTELLOY® G™ alloy, detailing its chemical composition, mechanical properties, performance across 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)
66.0 min
Chromium (Cr)
21.0 – 23.5
Iron (Fe)
5.0 – 7.0
Molybdenum (Mo)
6.0 – 8.0
Copper (Cu)
1.0 – 2.5
Manganese (Mn)
1.0 max
Silicon (Si)
0.70 max
Carbon (C)
0.05 – 0.15
Sulfur (S)
0.015 max
Phosphorus (P)
0.015 max
Mechanical Properties
Property
Value
Tensile Strength, ksi (MPa)
110 (760) min
Yield Strength (0.2% offset), ksi (MPa)
52 (360) min
Elongation (% in 2 inches)
40 min
Hardness, Rockwell C (HRC)
25 – 35
Performance at Different Temperatures
HASTELLOY® G™ alloy exhibits excellent performance across varying temperature ranges:
Room Temperature: Exceptional resistance to oxidizing and reducing acids such as sulfuric acid, nitric acid, and hydrochloric acid.
Elevated Temperatures: Maintains high strength and corrosion resistance up to 1800°F (980°C), making it suitable for high-temperature chemical processing.
Low Temperatures: Retains ductility and toughness at cryogenic temperatures, ensuring reliability in extreme environments.
Industry Applications
HASTELLOY® G™ alloy finds applications across various industries due to its superior corrosion resistance:
Industry Sector
Applications
Chemical Processing
Reactors, heat exchangers, and piping systems handling aggressive chemicals such as acids and chlorides.
Pulp and Paper
Equipment for bleach plants, digesters, and evaporators exposed to corrosive media.
Oil and Gas
Components in refineries and petrochemical plants exposed to sour gas environments containing hydrogen sulfide.
Pharmaceutical
Pharmaceutical processing equipment requiring resistance to harsh 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 B582
Bars
Round bars, hexagonal bars
Diameter: 0.25″ – 6.0″ (6.35mm – 152.4mm)
ASTM B582
Tubes/Pipes
Seamless tubes, welded pipes
OD: 0.5″ – 6.0″ (12.7mm – 152.4mm)
ASTM B619, ASTM B622
Standards and Corresponding Grades
Country/Region
Standard/Grade
USA
UNS N06007
Europe
2.4618
Germany
NiCr23Mo16Cu
France
NC23FeDU
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 aggressive chemicals, high mechanical strength, and reliability in extreme environments.
Disadvantages
Higher initial cost compared to conventional stainless steels, limited availability of specific shapes and sizes.
Similar Products
Product Name
Comparison
HASTELLOY C-276 (UNS N10276)
Higher molybdenum content and broader resistance to oxidizing and reducing environments compared to G™ alloy.
HASTELLOY C-22 (UNS N06022)
Higher chromium content and resistance to oxidizing and reducing acids, including wet chlorine and ferric and cupric chlorides.
Comparison of Similar Products
Property/Feature
Hastelloy G™
Hastelloy C-276
Hastelloy C-22
Nickel Content (%)
66.0
57.0
56.0
Molybdenum Content (%)
6.0 – 8.0
15.0 – 17.0
12.5 – 14.5
Chromium Content (%)
21.0 – 23.5
14.5 – 16.5
20.0 – 22.5
Tensile Strength (ksi)
110 min
110 min
115 min
Yield Strength (ksi)
52 min
52 min
55 min
Corrosion Resistance
Excellent in oxidizing and reducing acids, including sulfuric, nitric, and hydrochloric acid.
Excellent in a wide range of corrosive environments, including strong oxidizers and reducing agents.
Excellent in oxidizing and reducing acids, including wet chlorine and ferric and cupric chlorides.
This comprehensive article provides a detailed introduction to HASTELLOY® G™ alloy (UNS N06007), encompassing 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.
