hatchet, vanadium
鐇 centers on a metal tool for cutting or chopping: a hatchet. The vanadium sense is a modern chemical element name assigned to this character, not a natural extension of the hatchet meaning.
鐇 combines 金 (metal) with 番, which likely contributes the sound. The character originally referred to a metal hatchet. The vanadium meaning is a modern scientific assignment unrelated to the historical origin.
The left side 金 (metal) and the right side 番 (which can suggest a number or turn) together form a metal tool used in repeated chopping motions: a hatchet.
For ハン, imagine a hand holding a hatchet: hand -> ハン, and the metal blade chops down.