The most widely known Steel is a weapons engineer named John Henry Irons who became a super-hero to emulate Superman, fighting crime as a member of Team Superman. Designing an advanced exo-skeleton, he wields a number of technological gadgets including a Kinetic Hammer. His niece Natasha Irons has also taken up the identity. He has also been a member of the Justice League, S.T.A.R. Labs and the Suicide Squad. Steel was created by Louise Simonson and Jon Bogdanove, first appearing during the Reign of the Supermen! storyline in Adventures of Superman #500 (1993).
There is an unrelated Steel legacy beginning with Hank Heywood, also known as Commander Steel. He had super-strength due to a skeleton made of steel alloy and a steel enhanced muscle structure. Heywood was active during World War II as a member of the All-Star Squadron. His grandson Hank took the name Steel as a member of Justice League Detroit. Following Steel's death, his cousin Nathan Heywood joined the Justice Society as Citizen Steel. In the New 52 reboot, Hank Heywood, Jr. is Captain Steel on Earth 2. Steel was created by Gerry Conway and Don Heck, first appearing in Steel #1 (1978).