# Alloy 330 UNS N08330: Properties and Applications
## Introduction to Alloy 330 UNS N08330
Alloy 330, also known as UNS N08330, is a nickel-iron-chromium austenitic alloy designed for high-temperature applications. This material offers excellent resistance to oxidation and carburization, making it a popular choice for various industrial applications.
## Chemical Composition
The chemical composition of Alloy 330 plays a crucial role in its performance characteristics:
– Nickel (Ni): 34-37%
– Chromium (Cr): 17-20%
– Iron (Fe): Balance
– Carbon (C): 0.05-0.10%
– Manganese (Mn): 2.0% max
– Silicon (Si): 0.75-1.50%
– Sulfur (S): 0.03% max
## Mechanical Properties
Alloy 330 exhibits impressive mechanical properties across a wide temperature range:
– Tensile Strength: 75 ksi (517 MPa) min
– Yield Strength: 30 ksi (207 MPa) min
– Elongation: 30% min
– Hardness: Rb 85 max
## Physical Properties
The physical characteristics of Alloy 330 include:
– Density: 0.29 lb/in³ (8.03 g/cm³)
– Melting Point: 2500-2600°F (1371-1427°C)
– Thermal Expansion Coefficient: 8.9 µin/in·°F (20-1000°C)
– Thermal Conductivity: 12.4 Btu·in/ft²·hr·°F at 212°F (100°C)
## Key Features and Advantages
Alloy 330 offers several notable benefits:
– Excellent resistance to oxidation up to 2100°F (1149°C)
– Good resistance to carburization and nitriding
– High strength at elevated temperatures
– Good thermal fatigue resistance
– Excellent formability and weldability
## Common Applications
Due to its unique properties, Alloy 330 finds use in various demanding applications:
### Industrial Heating
– Furnace components
– Heat treatment fixtures
– Retorts and muffles
– Radiant tubes
Keyword: Alloy 330 UNS N08330
### Petrochemical Industry
– Reformers
– Catalyst support grids
– Pyrolysis tubes
– Heat exchangers
### Other Applications
– Aircraft exhaust systems
– Nuclear reactor components
– Chemical processing equipment
– Glass manufacturing equipment
## Fabrication and Welding
Alloy 330 can be readily fabricated using standard techniques:
– Hot working should be performed between 1800-2250°F (982-1232°C)
– Cold working requires intermediate annealing
– Welding can be performed using matching filler metal (AWS A5.14 ER330)
– Post-weld heat treatment is generally not required
## Conclusion
Alloy 330 UNS N08330 is a versatile high-temperature alloy that combines excellent oxidation resistance with good mechanical properties. Its ability to withstand extreme environments makes it invaluable for numerous industrial applications where other materials would fail. When selecting materials for high-temperature service, Alloy 330 should be strongly considered for its proven performance and reliability.
