Nickel 200 (UNS N02200) – Properties, Applications, and Specifications

# Nickel 200 (UNS N02200) – Properties, Applications, and Specifications

## Introduction to Nickel 200

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

## Chemical Composition

The chemical composition of Nickel 200 is as follows:

– Nickel (Ni): 99.0% min
– Carbon (C): 0.15% max
– Manganese (Mn): 0.35% max
– Iron (Fe): 0.40% max
– Silicon (Si): 0.35% max
– Copper (Cu): 0.25% max
– Sulfur (S): 0.01% max

## 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: 0.096 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 typical mechanical properties of Nickel 200 are:

– Tensile Strength: 380-550 MPa (55-80 ksi)
– Yield Strength (0.2% offset): 100-350 MPa (15-51 ksi)
– Elongation: 40-50% in 50 mm (2 in)
– Hardness: 45-90 HRB
– Modulus of Elasticity: 180 GPa (26 x 10⁶ psi)

## Corrosion Resistance

Nickel 200 offers excellent corrosion resistance in various environments:

– Resistant to caustic alkalis
– Performs well in neutral and alkaline salt solutions
– Excellent resistance to organic acids
– Good performance in reducing environments
– Limited resistance to oxidizing acids

## Applications of Nickel 200

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

### Chemical Processing

– Equipment for handling caustic soda
– Reactors and vessels for organic chemical production
– Heat exchangers in corrosive environments

### Food Processing

– Equipment for fatty acid production
– Food handling machinery
– Storage tanks for food-grade products

### Electronics

– Battery components
– Electronic components requiring high purity
– Lead frames

### Other Applications

– Aerospace components
– Marine engineering
– Nuclear power generation
– Pharmaceutical equipment

## Fabrication and Welding

Nickel 200 can be readily fabricated using standard techniques:

### Forming

– Can be cold worked using standard methods
– Requires intermediate annealing for severe forming operations
– Springback is greater than for steel

### Machining

– Similar to austenitic stainless steels
– Requires rigid setups and sharp tools
– Produces stringy chips

### Welding

– Can be welded using GTAW, GMAW, SMAW, and PAW methods
– Preheating is generally not required
– Post-weld heat treatment is not necessary

## Specifications and Standards

Nickel 200 is covered by various international standards:

– ASTM B160: Nickel Rod and Bar
– ASTM B161: Nickel Seamless Pipe and Tube
– ASTM B162: Nickel Plate, Sheet, and Strip
– ASTM B725: Nickel Welded Pipe
– EN 2.4060: European designation
– DIN 17740: German standard

## Comparison with Other Nickel Alloys

While Nickel 200 is a pure nickel alloy, it’s often compared with:

– Nickel 201 (UNS N02201):