# 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%
– Iron (Fe): ≤ 0.40%
– Manganese (Mn): ≤ 0.35%
– Silicon (Si): ≤ 0.35%
– Copper (Cu): ≤ 0.25%
– Carbon (C): ≤ 0.15%
## Physical Properties
UNS N02200 exhibits several notable physical properties:
Keyword: uns n02200
– Density: 8.89 g/cm³ (0.321 lb/in³)
– Melting Point: 1435-1446°C (2615-2635°F)
– Electrical Resistivity: 0.096 µΩ·m
– Thermal Conductivity: 70 W/m·K
– Coefficient of Thermal Expansion: 13.3 µm/m·°C (20-100°C)
## Mechanical Properties
The mechanical properties of Nickel 200 make it suitable for demanding applications:
– Tensile Strength: 380-550 MPa (55-80 ksi)
– Yield Strength: 100-350 MPa (15-51 ksi)
– Elongation: 40-50%
– Hardness: 45-90 HRB
## Corrosion Resistance
UNS N02200 offers excellent corrosion resistance in various environments:
– Resistant to caustic alkalis at all concentrations and temperatures
– Good resistance to neutral and alkaline salt solutions
– Excellent performance in distilled and natural waters
– Resistant to dry halogen gases at room temperature
– Good resistance to hydrochloric and sulfuric acids at moderate temperatures and concentrations
## Applications of UNS N02200
Nickel Alloy 200 finds applications in numerous industries:
### Chemical Processing
– Equipment for handling caustic soda and other alkalis
– Reaction vessels and storage tanks
– Piping systems for corrosive chemicals
### Food Processing
– Equipment for fatty acid production
– Food handling machinery
– Processing vessels for edible oils
### Electrical and Electronic
– Battery components
– Electronic tube components
– Spark plug electrodes
### Aerospace
– Rocket engine components
– Turbine blades
– Heat exchangers
### Other Applications
– Marine engineering components
– Water treatment equipment
– Heat exchanger tubes
## Fabrication and Welding
UNS N02200 can be readily fabricated using standard techniques:
– Hot working should be performed between 650-1230°C (1200-2250°F)
– Cold working requires intermediate annealing
– Welding can be done using gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW)
– Post-weld heat treatment is generally not required
## Heat Treatment
Nickel 200 can be annealed at 705-925°C (1300-1700°F) followed by rapid cooling to maintain optimal properties. Stress relieving can be performed at 425-540°C (800-1000°F).
## Conclusion
Nickel Alloy UNS N02200 offers a unique combination of corrosion resistance, mechanical properties, and workability, making it an excellent choice for demanding applications across various industries. Its purity and performance characteristics ensure reliable service in corrosive environments where other materials might fail.
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