Nickel 200 (UNS N02200) and Nickel 201 (UNS N02201) are two types of commercially pure nickel (≥99% Ni) known for their excellent corrosion resistance, high thermal and electrical conductivity, and good mechanical properties. The primary distinction between them lies in their carbon content, which influences their performance in high-temperature environments.

2. Chemical Composition Comparison

Key Differences:

• Nickel 201 has a lower carbon content (≤0.02%), making it less susceptible to graphite formation (carbon precipitation leading to material embrittlement) in high-temperature environments above 300°C. This makes it more suitable for high-temperature applications.

• Nickel 200, with a higher carbon content (≤0.15%), is more prone to carbon precipitation when used at elevated temperatures over prolonged periods, affecting its mechanical properties.

3. Nickel 200 and Nickel 201：Key Properties

（1）Corrosion Resistance:

• Excellent resistance to alkaline media (e.g., NaOH, KOH) and neutral/mild acidic solutions.

• Superior resistance to chloride-induced stress corrosion cracking compared to stainless steel.

• Not suitable for strong oxidizing acids (e.g., nitric acid, concentrated sulfuric acid).

• Due to its lower carbon content, Nickel 201 exhibits better corrosion resistance at high temperatures compared to Nickel 200. It is more capable of withstanding corrosive environments under high temperature and pressure.

（2）Mechanical Properties:

• Good ductility and toughness, easy to cold work.

• Typical tensile strength: ~380-550 MPa (annealed condition).

• Yield strength: ~170-280 MPa.

• High elongation, typically reaching 35%-50%.

（3）Physical Properties:

• Density: ~8.9 g/cm³, relatively high compared to most metals.

• Excellent electrical and thermal conductivity.

• Ferromagnetic behavior, displaying noticeable magnetism in a magnetic field.

4. Typical Applications

（1）Nickel 200:

• Food Processing Equipment (Corrosion-resistant, non-toxic).

• Chemical Piping & Storage Tanks (Resistant to alkaline solutions).

• Electronic Components (High electrical conductivity).

（2）Nickel 201:

• High-Temperature Chemical Equipment (e.g., caustic soda production).

• Aerospace Components (Heat-resistant, low thermal expansion).

• Nuclear Industry (Neutron shielding material).

5. Nickel 200 and Nickel 201：Considerations

• Good weldability, but contamination from sulfur, lead, and other impurities should be avoided to prevent hot cracking.

• Nickel 200 may experience carbon precipitation if used above 300°C for extended periods, making Nickel 201 the preferred alternative in such cases.

6. Summary

• If a commercially pure nickel material is needed for high-temperature applications (>300°C), Nickel 201 is the superior choice due to its reduced carbon content, preventing graphite formation.

• However, for applications in ambient or low-temperature conditions, Nickel 200 offers better cost efficiency while maintaining excellent performance.

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