Most superheroes from the 1940s were strongly patriotic due to the minor fact that there was a big world war going on at the time - one which necessitated America and other countries creating a national identity for themselves that strongly opposed the Nazis. While many of these 2-bit patriots were capable fighters, very few had as strong an association with Lady Liberty as the Steel Fist did.
Formerly Timothy Slade (very conflicting vibes with that name), the Steel Fist was just an ordinary factory worker until, one day, the Nazis invaded his factory! Remembering how his brother died for his country, Tim tried to fight back, but... well, he wasn't really cut out for it. This resulted in the Nazis dipping their hand in molten steel.
But fortunately for Tim, the steel actually bonded with his flesh, causing him to gain the ability to- just kidding, his arm is fucking mangled and the doctors consider amputating it. Fortunately for him though, Lady Liberty herself sees Tim's plight and takes pity on him. Using her magic abilities, she fixes his arm, making it fully functional again... except now it's made of steel!
Like a very based individual, his immediate instinct upon gaining the strongest fist in the world is to go out and punch Nazis with it. While he is very average in literally any other regard, his fist is a metal bludgeoning weapon and he can use it to annihilate any roaming fash he sees. While he only lasted for 5 issues, his sentiment lives on in all our hearts.