Disambiguation: John Henry Irons
First published in: 1993
John Henry Irons first appeared in Adventures of Superman (DC, 1987 series) #500 (Early June 1993). He became the Man of Steel in Superman: The Man of Steel (DC, 1991 series) #22 (June 1993). John changed his codename to "Steel" in Adventures of Superman (DC, 1987 series) #504 (September 1993).
Link: https://en.wikipedia.org/wiki/Steel_(John_Henry_Irons)