Nickel 200/201 / UNS N02200 / W.Nr. 2.4060/2.4066 & 2.4061/2.4068
Nickel 200 / 201
Nickel 200 (UNS N02200) and Nickel 201 (UNS N02201) are both commercially pure nickel alloys that exhibit excellent resistance to corrosion, making them popular choices in many industries. They are solid solution strengthened, meaning they are strong, durable, and maintain their mechanical properties even at high temperatures.
Nickel 200 has a high electrical and thermal conductivity, making it suitable for use in electronic and electrical applications. It is often used in caustic soda evaporators, exchangers, heat exchangers, and other high temperature applications where resistance to corrosives is essential. Additionally, nickel 200 has low gas content and is highly resistant to stress-corrosion cracking.
Nickel 201, on the other hand, was developed to control carbon content, with a maximum of 0.02%. This helps prevent intergranular precipitation at high temperatures, which can cause embrittlement in some processes. As a result, nickel 201 is ideal for use in applications where high temperature resistance and low carbon content are crucial.
Industries and Applications
Nickel 200/201, a solid solution strengthened, commercially pure wrought material, is widely used in various industries including chemical, electronics, aerospace, petrochemical, power generation and marine/offshore engineering. Its applications range from electronic and electroplating components, caustic evaporators, food processing equipment, synthetic fiber production, salt production to processes where sodium hydroxide and fluorine are used.
Resistance to Corrosion
Alloy 200/201 boasts excellent resistance to corrosion in reducing and neutral media, as well as in oxidizing atmospheres, thanks to the formation of a passive oxide film. This film provides exceptional protection against corrosion in caustic environments. Nickel 200/201 is commonly used in environments containing alkalies and has varying resistance to sulfuric, hydrochloric, anhydrous hydrofluoric and non-aerated organic acids. The alloy is also resistant to stress corrosion cracking in chloride salts and non-oxidizing halides, though its resistance may vary depending on concentration and temperature.
Fabrication and Heat Treatment
Nickel 200/201 can be shaped using both hot and cold working practices. Hot working temperatures should be between 1200°F and 2250°F, with heavy forming performed at temperatures above 1600°F. Annealing should be done at a temperature between 1300°F and 1600°F, with care taken to choose the anneal temperature as time-at-temperature can greatly impact the material’s mechanical properties and structure.
Nickel 200/201 – Applicable Specifications
| Form | ASTM | ASME | Other |
|---|---|---|---|
| Nickel 200/201 Sheet & Plate |
B162 | SB-162 | N02200, N02201 |
| Nickel 200/201 Bar | B160 | SB-160 | N02200, N02201 |
| Nickel 200/201 Pipe & Tube | B161 | SB-161 | N02200, N02201 |
| Nickel 200/201 Fittings | B366 | SB-366 | N02200, N02201 |
| Nickel 200/201 Forgings | B564 | SB-564 | N02200, N02201 |
| Nickel 200/201 Wire | B160 | SB-160 | N02200, N02201 |
Common Trade Names
Nickel 200 and Nickel 201 are the common trade names for this versatile alloy.
Key Properties
(in annealed condition)
| Property | Nickel 200 | Nickel 201 |
|---|---|---|
| Density | 8.9 g/cm³ | 8.9 g/cm³ |
| Tensile Strength | 650 MPa | 550 MPa |
| Yield Strength | 345 MPa | 275 MPa |
| Elongation | 40% | 40% |
| Hardness (Brinell) | 200 | 200 |
Chemical Composition (%)
| Element | Composition |
|---|---|
| (Ni) Nickel | 99.0 min |
| (Fe) Iron | 0.40 max |
| (Mn) Manganese | 0.35 max |
| (Si) Silicon | 0.35 max |
| (Cu) Copper | 0.25 max |
| (C) Carbon | 0.02 max |
| (S) Sulfur | 0.01 max |
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