# Alloy 75 UNS N06075: Properties and Applications
## Introduction to Alloy 75 UNS N06075
Alloy 75, also known as UNS N06075, is a nickel-chromium-iron alloy that offers excellent resistance to oxidation and corrosion at high temperatures. This alloy is widely used in various industrial applications due to its unique combination of mechanical properties and chemical resistance.
## Chemical Composition
The chemical composition of Alloy 75 plays a crucial role in its performance characteristics. The primary elements include:
– Nickel (Ni): 58-63%
– Chromium (Cr): 19-23%
– Iron (Fe): 5-9.5%
– Manganese (Mn): ≤1.0%
Keyword: Alloy 75 UNS N06075
– Silicon (Si): ≤0.5%
– Carbon (C): ≤0.10%
– Aluminum (Al): 0.2-0.5%
– Titanium (Ti): 0.15-0.6%
## Physical Properties
Alloy 75 exhibits several notable physical properties:
– Density: 8.19 g/cm³
– Melting Range: 1350-1400°C (2462-2552°F)
– Electrical Resistivity: 1.12 μΩ·m
– Thermal Conductivity: 11.4 W/m·K at 100°C
## Mechanical Properties
The mechanical properties of Alloy 75 make it suitable for demanding applications:
– Tensile Strength: 550-690 MPa
– Yield Strength: 240-415 MPa
– Elongation: 30-55%
– Hardness: 150-200 HB
## Corrosion Resistance
One of the most significant advantages of Alloy 75 is its exceptional corrosion resistance:
– Excellent resistance to oxidizing environments
– Good resistance to carburizing and nitriding atmospheres
– Maintains stability in sulfur-containing environments
– Resistant to chloride ion stress-corrosion cracking
## High-Temperature Performance
Alloy 75 performs exceptionally well in high-temperature applications:
– Retains strength at temperatures up to 1100°C (2012°F)
– Excellent resistance to oxidation and scaling
– Good creep-rupture strength
– Stable microstructure at elevated temperatures
## Fabrication and Welding
Alloy 75 can be fabricated using standard techniques:
– Hot working should be performed between 870-1200°C (1600-2200°F)
– Cold working requires intermediate annealing
– Can be welded using conventional methods (TIG, MIG, resistance)
– Post-weld heat treatment is generally not required
## Heat Treatment
Proper heat treatment enhances the properties of Alloy 75:
– Solution annealing at 1095-1205°C (2000-2200°F)
– Rapid cooling is essential to maintain corrosion resistance
– Stress relieving at 870-925°C (1600-1700°F) may be beneficial
## Applications of Alloy 75 UNS N06075
Alloy 75 finds applications in various industries:
### Industrial Furnace Components
– Radiant tubes
– Muffles
– Retorts
– Furnace fixtures
### Chemical Processing
– Reactor vessels
– Heat exchangers
– Catalyst support grids
– Pyrolysis tubes
### Power Generation
– Combustion cans
– Transition ducts
– Afterburner components
– Heat recovery systems
### Other Applications
– Aerospace components
– Nuclear reactors
– Petrochemical processing equipment
– Waste incineration systems
## Advantages Over Other Alloys
Alloy 75 offers several advantages compared to similar materials:
– Better oxidation resistance than many stainless steels
– Superior carburization resistance compared to standard nickel alloys
– More cost-effective than some high-performance alloys
– Easier to fabricate than some refractory metals
## Limitations and Considerations
While