When the desulphurization is sufficiently complete, the sulphurbearing slag is removed, the final additions needed to give the metal exactly the composition aimed at are made, and the molten steel is tapped out of the furnace into its moulds.
The iron is then held molten till it has grown hot enough for casting and till enough of its carbon has been burnt away to leave just the carbon-content desired, and it is then tapped out and poured into the moulds.
Morse code were being tapped out on the steel pipes running along the ship.
The best Valentine's gifts are from the heart, but sometimes even that takes a little probing when you're new to a relationship or you've just been together for so long you're all tapped out of good ideas.