International Standard Comparative

UNS umbering Systems.

Unified Numbering Systems for Metals and Alloys


The UNS for Metals and Alloys provides a means of correlating many internationally used metal and alloy numbering systems administered by societies, trade associations, and individual users and producers of metals and alloys. Jointly developed by ASTM International and the Society of Automotive Engineers (SAE), it provides the uniformity necessary for efficient indexing, record keeping, data storage and retrieval, and cross-referencing.

UNS Number C GROUP : Copper and Copper Alloys

C10100~C11300 | C11400~C16200 | C16500~C37000 | C37700~C65100

C84400~C94400 | C94500~C99500

UNS Number F GROUP : Cast Irons

F10001~F24830 | F25530~F47003

UNS Number G GROUP : AISI and SAE Carbon and Alloy Steels

G10050~G10250 | G10260~G11080 | G11090~G15720 | G31400~G44270 | G45200~G51600

G51601~G92600 | G92620~G98500

UNS Number J GROUP : Cast Steel (Except Tool Steels)

J02002~J13512 | J13855~J92590 | J92600~J94650

UNS Number K GROUP : Miscellaneous Steels and Ferrous Alloys

K00040~K02300 | K02301~K03017 | K03046~K07000 | K07001~K11630 | K11646~K12238

K12244~K19667 | K19965~K32550 | K32723~K93120 | K93600~K95000

UNS Number N GROUP : Nickel and Nickel Alloys

N02200~N07080 | N07353~N08811 | N08825~N10665

UNS Number S GROUP : Heat and Corrosion Refractory Metals and Alloys

S13800~S30200 | S30215~S30909 | S30940~S31654 | S31700~S35000 | S35500~S43035


Comparative Table

UNS Number G GROUP : AISI and SAE Carbon and Alloy Steels - G92620~G98500
ASTM Brand/Trp
ASTM Equivalent
UNS G92620 Si-Cr Alloy Steel   ASTM A304(9262), ASTM A519(9262),
UNS G93106 Ni-Cr-Mo-B Alloy Steel   ASTM A29(E9310), ASTM A322(E9310)
      ASTM A331(E9310), ASTM A519(E9310)
UNS G94151 Ni-Cr-Mo-B Alloy Steel   ASTM A519(94B15)
UNS G94171 Ni-Cr-Mo-B Alloy Steel   ASTM A519(94B17)
UNS G94301 Ni-Cr-Mo-B Alloy Steel   ASTM A322(94B30), ASTM A331(94B30),
      ASTM A519(94B30)
UNS G94401 Ni-Cr-Mo-B Alloy Steel   ASTM A519(94B40)
UNS G98400 Ni-Cr-Mo-B Alloy Steel   ASTM A519(9840), ASTM A711
UNS G98500 Ni-Cr-Mo Alloy Steel   ASTM A519(9850)
      ASTM A689
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