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The phrase "iron man" is correct and usable in written English.
It can be used as a noun phrase to refer to a strong, resilient and determined person. Example: After months of intense training, the athlete proved himself to be an iron man by finishing the marathon in record time.
Dictionary
iron man
noun
A self-acting spinning mule used in cotton manufacture.
synonyms
Exact(60)
Move over, Iron Man.
Iron Man? Captain America?
"Iron Man does not exist.
Minus the Iron Man suit.
His "Iron Man" prediction?
It's Iron Man!
Iron Man, fair enough.
No. Iron Man? Nope.
Will "Iron Man" become a franchise?
He must be Iron Man III.
Worldwide, "Iron Man" sold $585.1 million.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com