International Standard Comparative

BSI No. :: UNS No.

British Standards Institution :: Unified Numbering Systems for Metals and Alloys


BSI Group, also known in its home market as the British Standards Institution (or BSI), is a multinational business services provider whose principal activity is the production of standards and the supply of standards-related services. BSI produces British Standards, and, as the UK’s National Standards Body, is also responsible for the UK publication, in English, of international and European standards. The Group now operates internationally in 150 countries.


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.

Comparative Table8


B/- Council for Building and Civil Engineering C/- Chemical and Health Council
E/- Engineering Council L/- British Electrotechnical Committee and Electrotechnical Council
M/- Multitechnics Council S/- Systems : Management And Environment T/- Disc
BS No.&title BS Grade UNS&etc Spec   BS No.&title BS Grade UNS&etc Spec
C5   BS 1501 Part 1
Part 2
Spec, for alloy steels plates
224-460 K20403④1.0482
C6 224-490 K02400①A537-1
G1B 225-490 K02900④1.0445
NG21 62 K11789
NG3 240 ①A204-A
NG5 261 ④1.8817
NG52 271 ④1.8817
NG6 281 ④1.8817
D1 282 ④1.8817
D2 503 K31718①A203-D
309S94 509 K81340④1.5662
310S94 210 K81340④1.5662
311S94 620-27A K11757①A387-12-1
313S94 620-31A K11757①A387-12-2
316S96 621 K11789①A387-1&2
318S96 622-31 K21590①A387-1&2
347S96 Part 3
Spec. for corrosion and heat-resisting steels: plates, sheet and strip
304S12 S30403①A240-304L
Steels for pressure purposes
Part 1
Spec. for carbon and manganese steels Plates
141-360 ④1.0345 304S15 S30400①A240-304
151-360 K01700①A285-A,B 304S49 ④1.6901
151-400 K20801①A285-C 304S62 S30453④1.4311
151-430 ④1.0435 310S24 S31008④1.4845
154-360 ④1.0345 316S12 S31603④A240-316L
154-400 ④1.0425 316S16 S31600①A240-316
154-430 ④1.0435 316S37 S31603④1.4404
161-360 K02001④A515-55 316S49  
161-400 K02401④A515-60 316S62 S31653④1.4406
161-430 K02800④A515-65 316S66 ④1.3952
164-360 ④1.0345 316S82 S31603④1.4404
164-400 K02100④1.0425 320S17 ④1.4571
223-460 ④1.0435 321S12 S32100①A240-321
223-490 ④1.0445 321S49 S32100④1.4541
224-360 K01800①A516-55 321S87 S32100④1.4541
224-400 K02100①A516-60 347S17 S34700①A240-347
224-430 ④1.0436    


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