# Nickel 200 Alloy Properties and Applications

## Introduction to Nickel 200 Alloy

Nickel 200, also known as UNS N02200, is a commercially pure wrought nickel alloy with excellent mechanical properties and corrosion resistance. This alloy is widely used in various industries due to its unique combination of characteristics.

## Chemical Composition

The chemical composition of Nickel 200 alloy is as follows:

– Nickel (Ni): 99.0% minimum
– Carbon (C): 0.15% maximum

– Manganese (Mn): 0.35% maximum
– Iron (Fe): 0.40% maximum
– Silicon (Si): 0.35% maximum
– Copper (Cu): 0.25% maximum
– Sulfur (S): 0.01% maximum

## Physical Properties

Nickel 200 exhibits the following physical properties:

– Density: 8.89 g/cm³ (0.321 lb/in³)
– Melting Point: 1435-1446°C (2615-2635°F)
– Electrical Resistivity: 0.095 µΩ·m at 20°C
– Thermal Conductivity: 70 W/m·K at 20°C
– Coefficient of Thermal Expansion: 13.3 µm/m·°C (20-100°C)

## Mechanical Properties

The mechanical properties of Nickel 200 alloy include:

– Tensile Strength: 462 MPa (67 ksi) minimum
– Yield Strength (0.2% offset): 148 MPa (21.5 ksi) minimum
– Elongation: 47% minimum in 2 inches
– Hardness: 80 HRB maximum

## Corrosion Resistance

Nickel 200 offers excellent corrosion resistance in various environments:

– Resistant to reducing chemicals
– Excellent resistance to caustic alkalis
– Good resistance to neutral and alkaline salt solutions
– Performs well in food processing environments
– Resistant to distilled and natural waters

## Applications of Nickel 200 Alloy

Due to its unique properties, Nickel 200 finds applications in numerous industries:

### Chemical Processing Industry

– Equipment for handling caustic soda
– Reaction vessels
– Heat exchangers
– Piping systems

### Food Processing

– Food handling equipment
– Processing vessels
– Utensils and containers

### Electrical and Electronic Industry

– Battery components
– Electronic parts
– Spark plug electrodes

### Other Applications

– Aerospace components
– Marine equipment
– Water treatment systems
– Pharmaceutical manufacturing equipment

## Fabrication and Welding

Nickel 200 can be easily fabricated using standard techniques:

– Welding: Can be welded using gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW)
– Machining: Can be machined using high-speed steel tools with positive rake angles
– Forming: Can be cold worked using standard techniques
– Heat Treatment: Annealing at 705-925°C (1300-1700°F) recommended for stress relief

## Advantages of Nickel 200 Alloy

The main advantages of using Nickel 200 include:

– Excellent corrosion resistance
– Good thermal and electrical conductivity
– High ductility and formability
– Good mechanical properties at both low and high temperatures
– Non-magnetic characteristics
– Excellent resistance to caustic alkalis

## Limitations

While Nickel 200 has many benefits, there are some limitations to consider:

– Not suitable for oxidizing environments
– Limited strength at elevated temperatures
– More expensive than some alternative materials
– Requires proper handling to avoid contamination during fabrication

## Conclusion

UNS N02200 (Nickel 200) is a versatile material with excellent corrosion resistance and good mechanical properties. Its unique combination of characteristics makes it suitable for various demanding applications across multiple industries. When selecting materials for corrosive environments, especially those involving ca