What's the plural form of nickel steel? Here's the word you're looking for.
Answer
The noun nickel steel can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be nickel steel.
However, in more specific contexts, the plural form can also be nickel steels e.g. in reference to various types of nickel steels
or a collection of nickel steels.
