Zirconia Insert for Tundish Nozzles

The zirconia insert is the piece inside the tundish nozzle bore. It is the surface the steel runs through. Plants searching zirconia insert or zirconia tundish nozzle are usually replacing that piece or specifying it with the outer body.

Dedicated zirconia insert specification: density ≥ 5.3 g/cc, apparent porosity 5%, ZrO₂ ≥ 95%, SiO₂ ≤ 0.25%, MgO ≤ 0.28%, Fe₂O₃ ≤ 0.1%, CaO 0.04%.

The tundish nozzle TDS prints a different typical insert: ZrO₂ 96%, MgO 2.6%, SiO₂ 0.04%, Al₂O₃ 0.15%, bulk density 5.25 g/cm³, apparent porosity 7%. NUOHENG shows that line as “typical value shown in the tundish nozzle TDS”, not as the dedicated specification.

Tell the supplier which sheet your quality department will check. Send the bore with the insert enquiry.