Alloy 75 UNS N06075: Properties and Applications

July 19, 2025 / By

# 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 industries due to its unique combination of mechanical properties and chemical resistance.

## Chemical Composition

The chemical composition of Alloy 75 UNS N06075 plays a crucial role in its performance characteristics:

– Nickel (Ni): 58-63%
– Chromium (Cr): 19-23%
– Iron (Fe): Balance
– Manganese (Mn): ≤ 1.0%
– Silicon (Si): ≤ 0.5%
– Carbon (C): ≤ 0.10%
– Sulfur (S): ≤ 0.015%

## 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 (80-100 ksi)
– Yield Strength: 240-415 MPa (35-60 ksi)
– 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 strength at high temperatures
– Resistant to sulfur-containing gases

## High-Temperature Performance

Alloy 75 performs exceptionally well in high-temperature applications:

– Continuous service up to 1150°C (2100°F)
– Intermittent service up to 1250°C (2280°F)
– Excellent resistance to thermal shock
– Low tendency to form oxide scale

## Applications of Alloy 75 UNS N06075

Due to its unique properties, Alloy 75 finds applications in various industries:

### Industrial Heating

– Furnace components
– Heat treatment fixtures
– Radiant tubes
– Muffles

### Chemical Processing

– Catalyst support grids
– Retorts
– Reaction vessels
– Heat exchangers

### Power Generation

– Combustion chambers
– Burner components
– Heat recovery systems
– Turbine components

### Other Applications

– Glass manufacturing equipment
– Ceramic kiln furniture
– Nuclear reactors
– Aerospace components

## Fabrication and Welding

Alloy 75 can be fabricated using standard techniques:

– Hot working should be performed between 870-1200°C (1600-2190°F)
– Cold working requires intermediate annealing
– Can be welded using conventional methods
– Post-weld heat treatment is generally not required

## Conclusion

Alloy 75 UNS N06075 is a versatile high-performance material that combines excellent oxidation resistance with good mechanical properties at elevated temperatures. Its wide range of applications across various industries demonstrates its reliability and durability in demanding environments. When selecting materials for high-temperature applications, Alloy 75 should be considered for its proven performance and long service life.