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Nickel Alloy UNS N02200 Properties and Applications

# Nickel Alloy UNS N02200 Properties and Applications

## Introduction to UNS N02200

Nickel Alloy UNS N02200, also known as commercially pure nickel or Nickel 200, is a wrought material 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 UNS N02200 is primarily nickel with small amounts of other elements:

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

## Physical Properties

UNS N02200 exhibits several notable physical properties:

– Density: 8.89 g/cm³ (0.321 lb/in³)
– Melting Point: 1435-1446°C (2615-2635°F)
– Electrical Resistivity: 6.84 μΩ·cm at 20°C
– Thermal Conductivity: 70 W/m·K at 20°C
– Coefficient of Thermal Expansion: 13.3 μm/m·K (20-100°C)

## Mechanical Properties

The mechanical properties of Nickel 200 vary depending on the temper condition:

### Annealed Condition

– Tensile Strength: 380-550 MPa (55-80 ksi)
– Yield Strength (0.2% offset): 100-240 MPa (15-35 ksi)
– Elongation: 40-50%
– Hardness: 45-85 HRB

### Cold Worked Condition

– Tensile Strength: up to 830 MPa (120 ksi)
– Yield Strength: up to 690 MPa (100 ksi)
– Elongation: 2-25%
– Hardness: up to 100 HRB

## Corrosion Resistance

UNS N02200 offers excellent corrosion resistance in various environments:

– Resistant to reducing chemicals and caustic alkalis
– Good resistance to neutral and alkaline salt solutions
– Excellent performance in food processing applications
– Resistant to dry chlorine and hydrogen chloride gas at room temperature
– Not recommended for oxidizing environments or acids containing oxidizing salts

## Applications of UNS N02200

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

### Chemical Processing

– Equipment for handling caustic soda and other alkalis
– Vessels and piping for food and synthetic fiber production
– Components for fatty acid processing

### Electronics

– Lead frames
– Battery components
– Electronic housings

### Aerospace

– Rocket engine components
– Aircraft turbine blades (in certain applications)

### Other Applications

– Marine engineering components
– Heat exchangers
– Food processing equipment
– Water treatment systems

## Fabrication and Welding

UNS N02200 can be readily fabricated using standard techniques:

– Welding: Can be welded using most common methods including TIG, MIG, and resistance welding
– Machining: Similar to austenitic stainless steels but produces stringy chips
– Forming: Excellent ductility allows for cold forming operations
– Heat Treatment: Typically annealed at 705-925°C (1300-1700°F)

## Advantages of UNS N02200

The key advantages of this nickel alloy include:

– High thermal and electrical conductivity
– Excellent corrosion resistance in many environments
– Good mechanical properties over a wide temperature range
– Magnetic permeability below 1.010 at 200 oersteds (15.9 kA/m)
– Low gas content and low vapor pressure

## Limitations

While UNS N02200 offers many