C
SECTION C — CHEMISTRY; METALLURGY
 C

Note(s)

In section C, the definitions of groups of chemical elements are as follows:

  • Alkali metals: Li, Na, K, Rb, Cs, Fr
  • Alkaline earth metals: Ca, Sr, Ba, Ra
  • Lanthanides: elements with atomic numbers 57 to 71 inclusive
  • Rare earths: Sc, Y, Lanthanides
  • Actinides: elements with atomic numbers 89 to 103 inclusive
  • Refractory metals: Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W
  • Halogens: F, Cl, Br, I, At
  • Noble gases: He, Ne, Ar, Kr, Xe, Rn
  • Platinum group: Os, Ir, Pt, Ru, Rh, Pd
  • Noble metals: Ag, Au, Platinum group
  • Light metals: alkali metals, alkaline earth metals, Be, Al, Mg
  • Heavy metals: metals other than light metals
  • Iron group: Fe, Co, Ni
  • Non-metals: H, B, C, Si, N, P, O, S, Se, Te, noble gases, halogens
  • Metals: elements other than non-metals
  • Transition elements: elements with atomic numbers 21 to 30 inclusive, 39 to 48 inclusive, 57 to 80 inclusive, 89 upwards

  
METALLURGY
 C22
METALLURGY (of iron C21); FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS (general methods or devices for heat treatment of ferrous or non-ferrous metals or alloys C21D; production of metals by electrolysis or electrophoresis C25)
 C22F
CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS OR NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F 17/00)
 C22F 1/00
Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working (apparatus for mechanical working of metal B21, B23, B24, e.g. shot-peening apparatus B24C)
 C22F 1/02
·  in inert or controlled atmosphere or vacuum (adjusting the composition of the atmosphere C21D 1/76)
 C22F 1/04
·  of aluminium or alloys based thereon
 C22F 1/043
·  ·  of alloys with silicon as the next major constituent  [4]
 C22F 1/047
·  ·  of alloys with magnesium as the next major constituent  [4]
 C22F 1/05
·  ·  of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions  [4]
 C22F 1/053
·  ·  of alloys with zinc as the next major constituent  [4]
 C22F 1/057
·  ·  of alloys with copper as the next major constituent  [4]
 C22F 1/06
·  of magnesium or alloys based thereon
 C22F 1/08
·  of copper or alloys based thereon
 C22F 1/10
·  of nickel or cobalt or alloys based thereon
 C22F 1/11
·  of chromium or alloys based thereon
 C22F 1/12
·  of lead or alloys based thereon
 C22F 1/14
·  of noble metals or alloys based thereon
 C22F 1/16
·  of other metals or alloys based thereon
 C22F 1/18
·  ·  high-melting or refractory metals or alloys based thereon
 C22F 3/00
Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
 C22F 3/02
·  by solidifying a melt controlled by supersonic waves or electric or magnetic fields