How to Choose a Tundish Nozzle Bore Diameter

The bore diameter sets the steel flow through the tundish nozzle. Choosing it means matching the nozzle the strand already runs, or the size your casting practice asks for. It is not an average of the list.

Sizes on the tundish nozzle TDS: 10, 11, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16 and 16.5 mm. Half-millimetre steps matter. A 13 mm nozzle is not a substitute for 13.5 mm unless the plant accepts that change.

Measure the bore you are replacing, or read it from the drawing. If the size is outside the list, send the drawing and ask for that diameter. Write the length and the outer profile on the same enquiry.