Kulul duuban (Hot Rolled), yacni, gariiradda duuban ee kulul, waxay isticmaashaa sallax (inta badan billet shubista joogtada ah) sida alaab cayriin ah, ka dib kuleylka, waxaa laga sameeyaa bir xariijimo ah iyada oo la adeegsanayo mishiinka duuban oo qallafsan.Xarigga birta ah ee kulul ee ka soo rogrogmada ugu dambeysa ee duubista dhamaystirka waxaa lagu qaboojiyaa heerkul go'an iyadoo la raacayo qulqulka laminarka, ka dibna lagu duuduubo gariiradda birta ah ee birta ah ee gariiradda, iyo gariiradda birta la qaboojiyey.