R00001 - R99999 (Reactive and Refractory Metals and Alloys)
-
R03001 - R03999
-
R04001 - R04999
-
R05001 - R05999
-
R07001 - R07999
-
R10001 - R19999
-
R20001 - R29999 (Chromium)
-
R30001 - R39999 (Cobalt)
- R30001
- R30002
- R30003
- R30004
- R30005
- R30006
- R30007
- R30008
- R30012
- R30014
- R30016
- R30021
- R30027
- R30030
- R30031
- R30035
- R30036
- R30040
- R30075
- R30100
- R30102
- R30103
- R30106
- R30159
- R30188
- R30260
- R30404
- R30477
- R30556
- R30563
- R30590
- R30600
- R30605
- R30700
- R30783
- R30816
- R31000
- R31001
- R31233
- R31537
- R31538
- R31539
- R39001
-
R50001 - R59999
-
R60001 - R69999