Schau mal hier:   related discussion:Bleigießen
Es wird zwar keine Übersetzung aber eine mögliche Ümschreibung für den Begriff angegeben.

There are a few Google hits for "lead pouring" (also from native speakers), but I doubt that anybody unfamiliar with this German tradition will know what you are talking about. So you're probably going to have to describe what Bleigießen means.

Aus dem Link in #3 :

#3: Use that word and people will have even less of an idea what you are talking about than if you were to say "lead pouring" -- or even "Bleigießen." ;-)