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 Table9


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
BS1501 Part 3
347S49 S34700④1.4550 BS1503
625-520 K42544①A182-F5
347S67   660-440  
403S17 S40300④1.4000 660-460 ④1.7715
405S17 S40500①A24.-405 304S11 S30403①A182-F304L
460S52   304S31 S30400①A182-F304
NA15 ④1.4876 304S51 S30880①A182-304H
NA16 ④2.4858 310S31 S31000①A182-F310
Spec. for steel forgings for pressure purposes
221-410   316S11 S31603①A182-F316L
221-430 K03009①A350-LF1 316S13  
221-460 K03006①A234-WPB 316S31 S31600①A182-F316
221-490 K03011①A350-LF2 316S33 S31600
  ①A105 316S51 S31609①A182-F316H
221-510 K03501①A234-WPC 320S33 S31635
221-530   321S31 S32100①A182-F321
221-550   321S51-490 S32100④1.4541
223-410   321S51-510 S32100④1.4541
223-430   347S31 S34700①A182-F347
223-460   347S51 S34700④1.4550
223-490   403S17 S40300④1.4000
224-410 K02100④1.0426 405S17 S40500④1.4002
224-430   410S21 S41000 ①A182-F6a
224-460 K2007④1.0436 420S29 ④1.4024
224-490   BS1504
Spec for steel castings for pressure purposes
304C15 ①A743-CF8
224-510   316C16 ①A743-CF8M
245-420 K12822①A182-F1 310C40 ①A743-CK20
271-560   420C29 ①A743-CA15
503-490   425C11 ①A743-CA6NM
509-690 K81340④1.5662 BS1506
Spec. for carbon, low alloy and stainless steel vars and billets for bolting material to be used in pressure retaining applications
162 ①A194-2H
620-440 K11564①A234-WP12 253  
620-540/font> K11564①A182-F12 509-650  
621-460 K11572①A182-F11 509-690  
622-490 K21590①A234-WP22 630-790  
622-560 K21590①A182-F22 630-860  


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