Nickel 405 (UNS N04405):

Nickel 405 is a variation of Monel 400 with slightly modified chemical composition, featuring higher sulfur content.
The increased sulfur content improves machinability but may slightly reduce the alloy's corrosion resistance compared to Monel 400.
Despite the slight compromise in corrosion resistance, Nickel 405 still offers excellent resistance to marine environments, alkaline solutions, and acidic conditions.
It is often used in applications where improved machinability is desired, such as screw machine parts, fasteners, and valve stems.
Nickel 200 (UNS N02200) and Nickel 201 (UNS N02201) are commercially pure wrought nickel grades with low carbon content. They offer excellent resistance to corrosive environments, particularly alkaline solutions.