According to the particularity of a 15t tundish without top cover
the compound basic shielding flux YKL- 3 for tundish has been developed which can formed a loosen porous heat insulating layer at upper shielding flux and a basic flux layer at lower shielding flux as the quality of basic pre-melting stuff and expanded graphite is up to the requirement of index. The tolerance of basic pre-melting stuff to basic tundish line and the ability of basic shielding flux to absorb Al2O3 are better than that of acid shielding flux
and the extending feature and heat insulating effect of expanded graphite are also better than that of acid shielding flux. As casting ≤0. 15%C A32 steel and A36 steel