Steel grades to classify various steels by their composition and physical properties have been developed by a number of standards organizations.
Steel grades standards by country
For alloys in general (including steel), unified numbering system (UNS) of ASTM International and the Society of Automotive Engineers (SAE).
American steel grades : AISI/SAE steel grades standard
British Standards
International Organization for Standardization ISO/TS 4949:2003
European standards – EN 10027
Japanese steel grades : Japanese Industrial Standards (JIS) standard and NK standard
Germany steel grades : DIN standard
China steel grades : GB standard
Czech steel grades : ČSN standard
Russia steel grades : GOST standard
Spain steel grades : UNE standard
France steel grades : AFNOR standard
Italy steel grades : UNI standard
Sweden steel grades : SIS standard
Norway steel grades : DNV standard
Note that an increasing number of national European standards (DIN, AFNOR, UNE, UNI, etc.) and UK standards are being withdrawn and replaced by European Standards (EN). This task is carried out by the Comité Européen de Normalisation (CEN) (European Committee for Standardization).
