ISO/TS 4949:2016
Steel names based on letter symbols
ISO/TS 4949:2016 specifies rules for the designation of internationally standardized steel grades by means of symbolic letters and numbers to express application and principal characteristics (e.g. mechanical, physical, chemical) so as to provide an abbreviated identification of steel grades.
NOTE 1 In order to avoid ambiguity, the principal symbols established according to this document can be supplemented by additional symbols identifying additional characteristics of the steel or steel product, e.g. suitability for use at high or low temperatures, surface condition, treatment condition, deoxidation.
NOTE 2 These rules can also be applied to nationally or regionally standardized steels.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principles
4.1 A unique steel name
4.2 Formulation of steel names
4.3 Allocation of steel names
5 Reference to product standards
6 Classification of steel names
7 Structure of steel names
7.1 Initial symbol for steel castings
7.2 Steels designated according to their application and mechanical or physical properties (group 1)
7.3 Steels designated according to chemical composition (group 2)
7.3.1 Non-alloy steels (except free-cutting steels) with an average manganese content 1 % (sub-group 2.1)
7.3.2 Non-alloy steels with an average manganese content ≥ 1 %, non-alloy free-cutting steels and alloy steels (except high speed steels) where the average content, by mass, of every alloying element is 5 % (sub-group 2.2)
7.3.3 Alloy steels (except high speed steels) where the average content by mass of at least one alloying element is ≥ 5 % (sub-group 2.3)
7.3.4 High speed steel (sub-group 2.4)
8 Additional symbols
Annex A (normative) Additional symbols indicating special requirements
Annex B (normative) Additional symbols indicating type of coating
Annex C (normative) Additional symbols indicating treatment condition
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principles
4.1 A unique steel name
4.2 Formulation of steel names
4.3 Allocation of steel names
5 Reference to product standards
6 Classification of steel names
7 Structure of steel names
7.1 Initial symbol for steel castings
7.2 Steels designated according to their application and mechanical or physical properties (group 1)
7.3 Steels designated according to chemical composition (group 2)
7.3.1 Non-alloy steels (except free-cutting steels) with an average manganese content 1 % (sub-group 2.1)
7.3.2 Non-alloy steels with an average manganese content ≥ 1 %, non-alloy free-cutting steels and alloy steels (except high speed steels) where the average content, by mass, of every alloying element is 5 % (sub-group 2.2)
7.3.3 Alloy steels (except high speed steels) where the average content by mass of at least one alloying element is ≥ 5 % (sub-group 2.3)
7.3.4 High speed steel (sub-group 2.4)
8 Additional symbols
Annex A (normative) Additional symbols indicating special requirements
Annex B (normative) Additional symbols indicating type of coating
Annex C (normative) Additional symbols indicating treatment condition
Bibliography