Abstract: In order to meet the technical requirements for the production of low carbon steel and ultra-low carbon steel, brown corundum, plate-like corundum, fused magnesium aluminate spinel powder as raw materials, fused magnesia powder and alumina micro powder as additives, and almagnesia powder as binder, the machine pressed unburned corundum spinel carbon free brick was developed. The results show that the performance of the brick is the best when the content of fused magnesia powder and α-alumina powder is 3% and 8% respectively, and the service life of the brick in the molten pool and bottom of 90 ton LF Ladle is up to 105 furnaces.

Key words: Ladle, Carbon-free material, Complex magnesium-aluminum glue, Unfired brick, Corundum-spinel