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 Table18


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
Zn3   BS3602
Part 2
Spec. for longitudinally arc welded tubes
SAW410 ①A138B,C①A134
Zn4   SAW460  
Spec. for carbon steel pipes and tubes with specified room temperature properties for pressure purposes
BW320 ①A53-A    
ERW320 ①A53-A    
ERW360 K02054    
ERW430 K02504①A53-B    
S430 K03005①1.0408    
SAW430 ④1.0408 BS3603
Spec. for carbon and alloy steel pipes and tubes with specified low temperature properities for pressure purpose
CEW410LT50 K03008④1.0408
    CFS410LT50 K03008④1.0408
    CFS603LT100 K31918
    CFS609LT196 K81340
      ERW410LT50 K03008④1.0408
      HFS410LT50 K03008①A333-6
      HFS503LT100 K31918①A333-3
      HFS509LT196 K81340①A333-8
Spec. for steel pipes and tubes for pressure purposes : carbon and carbon manganese steel with specified edlevated temperature prooperties
Steel pipes and tubes for pressure purposes: ferritic alloy steel with specified elevated temperature properti-es
CEW620-440 K11562
    CEW620-460 K11562
    CEW621 K11597
    CFS620-440 K11562
Part 1
Spec. For seamless and electric resistance welded including induction welded tubes
HFS360 K02501①A106-A CFS620-460 K11562
CFS360 K02501 CFS621 K11597①A200-T11
ERW360 K02501 CFS622 K21530①A200-T22
CEW360 K02510 CFS625 K41545①A200-T5
HFS410 K03006①A106-B CFS629-470 S50400④1.7386
CFS410 K03006 CFS629-590  
ERW410 K03006 CFS660  
CEW410 K03006 CFS762 ④1.4922
HFS460 K03501 ERW620-440  
CFS460 k03501 ERW620-460 K11562
ERW460 k03501 ERW621 K11597
CEW460 K03501 HFS620-440 K11562①A335-P12
HFS490Nb   HFS620-460 K11562
CFS490Nb   HFS621 K11597①A200-T11
    HFS622 K21590①A200-T22
    HFS625 K41545①A200-T5
    HFS629-470 K50400①A335-P9


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