CPC Subgroup
B22D 11/117 by treating with gases (B22D11/118, B22D11/119 take precedence)
Full Title
Continuous casting of metals, i.e. casting in indefinite lengths (metal drawing, metal extruding B21C) > Supplying or treating molten metal (B22D41/00 takes precedence) > Treating the molten metal > Refining the metal > by treating with gases (B22D11/118, B22D11/119 take precedence)