The Nickel 201 alloys is an alloy that contains commercially pure wrought Nickel and has good mechanical properties that extend over a wide range of temperatures. The Nickel alloy 201 has excellent resistance to many corrosives, hydroxides in particular.

Nickel 201 has similar properties to Nickel 200. However, due to its lower carbon content, Nickel 201 can better prevent embrittlement by inter-granular carbon at elevated temperatures.

Nickel 201 has native properties to provide strong resistance to corrosion in acids and alkalis. It is especially useful under reducing conditions. The alloy has outstanding resistance to caustic alkalis, which includes its molten state. The alloy shows good resistance in acid, alkaline, and neutral salt solutions.

However, when Nickel 201 is in oxidizing salt solutions severe corrosion will occur. The Nickel 201 alloy is resistant to all dry gases at room temperature. In dry chlorine and hydrogen chloride, Nickel 201 alloy may be used in temperatures up to 550 °C. Its resistance to mineral acids varies according to temperature, concentration, and solution aeration. Its corrosion resistance displays better in de-aerated acid.