True to his name, Iron Fist has thrown some incredibly powerful punches in Marvel canon. While Marvel's chi-fueled martial arts superhero can channel his energy into a surprisingly diverse range of powers, nothing is more iconic than his most basic ability. Through careful concentration, Iron Fist can channel chi from throughout his body into his hand, until it begins to smolder and glow, and become "like unto a thing of iron."

https://screenrant.com/how-powerful-iron-fist-strongest-punch-powers/