Zirconia Tundish Nozzle Insert: Technical Guide

A zirconia tundish nozzle insert is specified with density, porosity and chemistry. Read the header of the sheet before you compare a number. NUOHENG keeps two headers.

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

Typical value shown in the tundish nozzle TDS: ZrO₂ 96%, MgO 2.6%, SiO₂ 0.04%, Al₂O₃ 0.15%, bulk density 5.25 g/cm³, apparent porosity 7%. Quote the header you were given. Do not average the two tables.