C
SECTION C — CHEMISTRY AND METALLURGY
  
METALLURGY
 C22
METALLURGY (of iron C21); FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS (production of metals by electrolysis or electrophoresis C25)
 C22D
( transferred to C22B 4/00, C25C )