Will steel rust in vinger?
Vinegar is dilute acetic acid CH3COOH and the acid will slowly attack the surface of the steel, not only eating it away but also increasing its surface area by creating pitting. Vinegar is mostly water, and water contains dissolved gases, importantly oxygen (as evidenced by the ability of many fish to survive without surfacing). It is this dissolved oxygen which will be chiefly to blame for your steel rusting if left to soak for a few days in vinegar.
