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 Table3


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
BS 970 Part 1

BS 970
Part 1


325S31   635A14  
347S31 ④1.4550 635H15  
403S17 ④1.4000 635M15  
410S21 ④1.4006 637A16  
416S21 ④1.4005 637H17  
416S29   655M17  
416S37   655H13 G39140④1.5752
416S41   655M13 G93140③SNC815
420S29 ④1.4024 655H17  
420S37 ④1.4021 655H20  
430S17 ④1.4013 655H23  
431S29 ④1.4057 655M17  
523H15   655M20  
523M15 ④1.7015 708A25 G41300②4130
523A15   708A30 G41300②4130
527H17   708A37 G41370②4137
527M17 ④1.1731 708A40 G41400②4140
530A30 G51300②5130 708A42 G41420②4142
530A32 G51320②5132 708A47 G41450②4145
530A36 G51350②5135 708H20 G41470②4147
530A40 G51400②5140 708H37 H41370
530H32 H51300④1.7033 708H42 H41420④1.722
530H36 H51350④1.7034 708H45  
530H40 H51400④1.7035 708M20 ③SCM420
530M40 G51400②5140 708M40 G41400②4140
535A99 ④1.3005 709A37  
590A15   709A40  
590H17 ④1.1731 709A42 G41420②4142
590M17 ④1.7131 709M40 G41400②4140
605A32   720M32  
605A37   722M24 ④1.7361
605H32   805A17  
605H37   805A20 G86200②8615


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