Steel Sterling's possesses "muscles of steel," which accounts for his Incredible strength.
VULNERABILITY TO SOLAR ACTIVITY:
This hover-craft is equipped with a heat-emission ray which does Excellent heat damage at a range of 3 areas; a magnetic-attractor beam, which will attract ferrous metals with Good intensity (400 lbs.), for the purpose of disarming enemies; a "repulsion force gun" which emits a beam of kinetic force, doing Excellent damage at a range of 6 areas; and a seismo-dial, for detecting earthquakes.
The Mighty League of the Just
When his father was killed by gangsters, young John Sterling decided to become a crime-fighter. Studying chemistry, he searched for something to give him an edge in his battle; what he found was a formula which, theoretically, would give his body the properties of steel.
Coating himself with the formula, he hesitated before taking the last step -- diving into a cauldron of molten steel. Mustering the courage, he jumped in and emerged with tissue as mighty and impervious as metal, with magnetic properties to boot.
Rather than adopt a secret identity per se, John pretended that the superhero was his brother; this gambit proved cumbersome, however, and was abandoned after several months in favor of John being Steel Sterling around-the-clock.