ISO 15510:2010

INTERNATIONAL ISO
STANDARD 15510
First edition
2010-12-15
Stainless steels — Chemical composition
Aciers inoxydables — Composition chimique

Reference number
©
ISO 2010
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ii © ISO 2010 – All rights reserved

Contents Page
Foreword .iv
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 Chemical composition .1
5 Designation of comparable steels.1
Annex A (informative) Designation of the steels given in Table 1 and of comparable grades
covered in various designation systems.15
Annex B (informative) Steels given in Table 1 and of comparable grades covered in various
International Standards .33
Annex C (informative) Classification of grades .42
Annex D (informative) Density values for stainless steels.45
Bibliography.51

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 15510 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 4, Heat treatable and
alloy steels.
This first edition cancels and replaces ISO/TS 15510:2003, which has been technically revised.

iv © ISO 2010 – All rights reserved

INTERNATIONAL STANDARD ISO 15510:2010(E)

Stainless steels — Chemical composition
1 Scope
This International Standard lists the chemical compositions of stainless steels agreed by ISO/TC 17/SC 4,
mainly on the basis of a composition of the specifications in existing ISO, ASTM, EN, JIS and GB (Chinese)
standards. They apply to all wrought product forms, including ingots and semi-finished material.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 6929:1987, Steel products — Definitions and classification
3 Terms and definitions
For the purposes of this document, the terms and definition given in ISO 6929:1987 and the following apply.
3.1
stainless steel
steel with at least 10,5 % (mass fraction) Cr and maximum 1,2 % (mass fraction) C
NOTE For the classification of stainless steels according to their structure, composition and application, see Annex C.
4 Chemical composition
The chemical composition of stainless steels approved by ISO/TC 17/SC 4 is given in Table 1.
WARNING — Due to hazardous effects to health and environmental problems of lead (Pb) it is
recommended to use steels with sulfur additions instead. These steels generally have comparable
properties relating to machinability.
NOTE If, in special cases, for example, an ISO committee charged with the establishment or revision of a standard
for a specific product or application of stainless steels sees the necessity of deviating from the specifications in Table 1, it
should inform ISO/TC 17/SC 4 (Secretariat's address: FES/DIN, Postfach 10 51 45, 40042 Dusseldorf, Germany) of the
reasons for this and try, before such deviations are considered, to achieve consensus for a corresponding modification to
Table 1.
5 Designation of comparable steels
The steel designation according to this International Standard is based on a 10-digit code presented in
4 subgroups of digits: 4 digits-3 digits-2 digits-1 digit.
XXXX-YYY-ZZ-A
The ISO designation of each grade is based on a decision of the ISO/TC 17/SC 4 group, taking into account
several commonly used existing standards and designations.
In particular, the principles below have been used for the designation.
⎯ The first subgroup contains 4 digits and is comparable to the European designation (EN numbers):
keeping the number on the right side and dropping the “1.”.
⎯ The second subgroup contains 3 digits and refers, in most cases, to the 3 middle digits of the UNS
number used by ASTM. In the case of the ISO designation, contrary to the UNS system, no letter (an S or
an N in the case of stainless steels) is used as a start. This 3-digit subgroup allows reference to the
obsolete AISI numbers or to the numerical part of the standard designations used in other countries, such
as Japan (JIS) and China (GB).
⎯ The third subgroup contains 2 digits. In most cases, similar principles to those used in the UNS have
been adopted. Care should be taken because some differences may exist between UNS, Chinese and
ISO designations (see Table 2). The principles stated in Table 2 apply within each YYY series.
⎯ The last digit is a single letter that allows the reader to identify, in a simple way, if the grade composition
corresponds exactly to that included in one or more of the 4 existing standard practices from Europe, the
USA, Japan or China. If the composition is a compromise between several standards, it is then a new and
genuine ISO composition. The last digit of the ISO designation is then I (see Table 3).
Table 4 gives complementary explanations for the use of the ISO numbering system through examples.
Tables A.1, A.2 and A.3 give the designations of stainless steels which are listed in other designation systems
and are identical or comparable to the grades in Table 1. In Table A.1, the sequence of steels is the same as
in Table 1. In Table A.2, the sequence is given in the order of the second column. In Table A.3, the sequence
is given in the order of the first column.
Table B.1 gives a list where the steel grades of Table 3 are to be found in other International Standards.
NOTE 1 To compare similar grades, it is necessary to check each element before making a substitution.
NOTE 2 The line number in the steel designation is an internal reference to ease the reading of the document. It is by
no means a designation and it is not for commercial purposes or as a technical reference. The number in brackets behind
gives the old line number as mentioned in ISO/TS 15510:2003.

2 © ISO 2010 – All rights reserved

Table 1 — Internationally agreed specifications for the composition of stainless steels (applicable for cast analysis)
a
Steel designation
% (mass fraction)
ISO number ISO name Line (old) C Si Mn P S N Cr Mo Ni Others
a) Austenitic steel
4318-301-53-I X2CrNiN18-7 A25A (04) 0,030 1,00 2,00 0,045 0,015 0,10 to 0,20 16,0 to 18,5 — 6,0 to 8,0 —
b
4319-301-00-I X5CrNi17-7 A24H (05) 0,07 1,00 2,00 0,045 0,030 0,10 16,0 to 18,0 — 6,0 to 8,0 —
b
4310-301-00-I X10CrNi18-8 A26L (11) 0,05 to 0,15 2,00 2,00 0,045 0,030 0,10 16,0 to 19,0 0,80 6,0 to 9,5 —
4325-302-00-E X9CrNi18-9 A27N 0,030 to 0,15 1,00 2,00 0,045 0,030 0,10 17,0 to 19,0 — 8,0 to 10,0 —
4326-302-15-I X12CrNiSi18-9-3 A27P (46) 0,15 2,00 to 3,00 2,00 0,045 0,030 — 17,0 to 19,0 — 8,0 to 10,0 —
b c
4307-304-03-I X2CrNi18-9 A27B (01) 0,030 1,00 2,00 0,045 0,030 0,10 17,5 to 19,5 — 8,0 to 10,5 —
b c
4306-304-03-I X2CrNi19-11 A30A (02) 0,030 1,00 2,00 0,045 0,030 0,10 18,0 to 20,0 — 10,0 to 12,0 —
b
4311-304-53-I X2CrNiN18-9 A27A (03) 0,030 1,00 2,00 0,045 0,030 0,12 to 0,22 17,5 to 19,5 — 8,0 to 11,0 —
b c
4301-304-00-I X5CrNi18-10 A28E (06) 0,07 1,00 2,00 0,045 0,030 0,10 17,5 to 19,5 — 8,0 to 10,5 —
4315-304-51-I X5CrNiN19-9 A28F (10) 0,08 1,00 2,50 0,045 0,030 0,10 to 0,25 18,0 to 20,0 — 7,5 to 10,5 —
b
4948-304-09-I X7CrNi18-9 A27L (07) 0,04 to 0,10 1,00 2,00 0,045 0,030 0,10 17,5 to 19,5 — 8,0 to 11,0 —
b
4818-304-15-E X6CrNiSiNCe19-10 A29J 0,04 to 0,08 1,00 to 2,00 1,00 0,045 0,015 0,12 to 0,20 18,0 to 20,0 — 9,0 to 11,0 Ce: 0,03 to 0,08
4650-304-75-E X2CrNiCu19-10 A29A 0,030 1,00 2,00 0,045 0,015 0,08 18,5 to 20,0 — 9,0 to 10,0 Cu: 1,00
4649-304-76-J X6CrNiCu19-9-1 A28I 0,08 1,00 2,00 0,045 0,030 — 18,0 to 20,0 — 8,0 to 10,5 Cu: 0,70 to 1,30
d
4305-303-00-I X10CrNiS18-9 A27M (14) 0,12 1,00 2,00 0,060 W 0,15 0,10 17,0 to 19,0 — 8,0 to 10,0 Cu
4625-303-23-X X12CrNiSe18-9 A27O 0,15 1,00 2,00 0,20 0,060 — 17,0 to 19,0 — 8,0 to 10,0 Se: W 0,15
4570-303-31-I X6CrNiCuS18-9-2 A27I (44) 0,08 1,00 2,00 0,045 W 0,15 0,10 17,0 to 19,0 0,60 8,0 to 10,0 Cu: 1,40 to 1,80
4667-303-76-J X12CrNiCuS18-9-3 A27Q 0,15 1,00 3,00 0,20 W 0,15 — 17,0 to 19,0 — 8,0 to 10,0 Cu: 1,50 to 3,5
e
4615-201-75-E X3CrMnNiCu15-8-5-3 A28C 0,030 1,00 7,0 to 9,0 0,040 0,010 0,02 to 0,06 14,0 to 16,0 0,80 4,5 to 6,0 Cu: 2,0 to 4,0
b c
4541-321-00-I X6CrNiTi18-10 A28G (16) 0,08 1,00 2,00 0,045 0,030 — 17,0 to 19,0 — 9,0 to 12,0 Ti: 5xC to 0,70
b c
4940-321-09-I X7CrNiTi18-10 A28O (17) 0,04 to 0,10 1,00 2,00 0,045 0,030 — 17,0 to 19,0 — 9,0 to 12,0 Ti: 5xC to 0,80
Ti: 5xC to 0,70
4941-321-09-I X6CrNiTiB18-10 A28J (18) 0,04 to 0,08 1,00 2,00 0,035 0,015 — 17,0 to 19,0 — 9,0 to 12,0
B: 0,001 5 to 0,005 0
b c
4550-347-00-I X6CrNiNb18-10 A28H (19) 0,08 1,00 2,00 0,045 0,030 — 17,0 to 19,0 — 9,0 to 12,0 Nb: 10xC to 1,00
b c
4912-347-09-I X7CrNiNb18-10 A28K (20) 0,04 to 0,08 1,00 2,00 0,045 0,030 — 17,0 to 19,0 — 9,0 to 12,0 Nb: 10xC to 1,00
4961-347-77-E X8CrNiNb16-13 A29L 0,04 to 0,10 0,30 to 0,60 1,50 0,035 0,015 — 15,0 to 17,0 — 12,0 to 14,0 Nb: 10xC to 1,20

4 © ISO 2010 – All rights reserved
Table 1 (continued)
a
Steel designation
% (mass fraction)
ISO number ISO name Line (old) C Si Mn P S N Cr Mo Ni Others
a) Austenitic steel
b
4567-304-30-I X3CrNiCu18-9-4 A27F (15) 0,04 1,00 2,00 0,045 0,030 0,10 17,0 to 19,0 — 8,0 to 10,5 Cu: 3,0 to 4,0
4567-304-76-I X6CrNiCu17-8-2 A25J (45) 0,08 1,70 3,00 0,045 0,030 — 15,0 to 18,0 — 6,0 to 9,0 Cu: 1,00 to 3,0
4567-304-98-X X6CrNiCu18-9-2 A27J 0,08 1,00 2,00 0,045 0,030 — 17,0 to 19,0 — 8,0 to 10,5 Cu: 1,00 to 3,0
4660-315-77-I X6CrNiCuSiMo19-10-3-2 A30J 0,08 0,50 to 2,50 2,00 0,045 0,030 — 17,0 to 20,5 0,50 to 1,50 8,5 to 11,5 Cu: 1,50 to 3,5
4867-316-77-J X40CrNiWSi15-14-3-2 A29P 0,35 to 0,45 1,50 to 2,50 0,60 0,040 0,030 — 14,0 to 16,0 — 13,0 to 15,0 W: 2,00 to 3,00
b
4303-305-00-I X6CrNi18-12 A30I (08) 0,08 1,00 2,00 0,045 0,030 0,10 17,0 to 19,0 — 10,5 to 13,0 —
4828-305-09-I X15CrNiSi20-12 A32R 0,20 1,50 to 2,50 2,00 0,045 0,030 0,10 19,0 to 21,0 — 11,0 to 13,0 —
4835-308-15-U X7CrNiSiNCe21-11 A32N 0,05 to 0,10 1,40 to 2,00 0,80 0,040 0,030 0,14 to 0,20 20,0 to 22,0 — 10,0 to 12,0 Ce: 0,03 to 0,08
4884-305-00-X X6CrNiSi18-13-4 A31H 0,08 3,0 to 5,0 2,00 0,045 0,030 — 15,0 to 20,0 — 11,5 to 15,0 —
b
4389-384-00-I X3NiCr18-16 A34F (09) 0,04 1,00 2,00 0,045 0,030 0,10 15,0 to 17,0 — 17,0 to 19,0 —
4371-201-53-I X2CrMnNiN17-7-5 A29B 0,030 1,00 6,0 to 8,0 0,045 0,015 0,15 to 0,25 16,0 to 17,5 — 3,5 to 5,5 Cu: 1,00
b
4372-201-00-I X12CrMnNiN17-7-5 A29O (13) 0,15 1,00 5,5 to 7,5 0,045 0,030 0,05 to 0,25 16,0 to 18,0 — 3,5 to 5,5 —
4597-204-76-I X8CrMnCuN17-8-3 A25L (40) 0,10 2,00 6,5 to 8,5 0,040 0,030 0,15 to 0,30 16,0 to 18,0 1,00 2,00 Cu: 2,00 to 3,5
4617-201-76-J X6CrNiMnCu17-8-4-2 A29I 0,08 1,70 3,0 to 5,0 0,045 0,030 — 15,0 to 18,0 — 6,0 to 9,0 Cu: 1,00 to 3,0
4618-201-76-E X9CrMnNiCu17-8-5-2 A30L 0,10 1,00 5,5 to 9,5 0,070 0,010 0,15 16,5 to 18,5 — 4,5 to 5,5 Cu: 1,00 to 2,50
4373-202-00-I X12CrMnNiN18-9-5 A32O 0,15 1,00 7,5 to 10,0 0,060 0,030 0,15 to 0,30 17,0 to 19,0 — 4,0 to 6,0 —
V: 0,15 to 0,40
4982-215-00-E X10CrNiMoMnNbVB 15-10-1 A32P 0,06 to 0,15 0,20 to 1,00 5,50 to 7,0 0,035 0,015 0,10 14,0 to 16,0 0,80 to 1,20 9,0 to 11,0 Nb: 0,75 to 1,25
B: 0,003 to 0,009
4369-202-91-I X11CrNiMnN19-8-6 A33L (43) 0,07 to 0,15 0,50 to 1,00 5,0 to 7,5 0,030 0,015 0,20 to 0,30 17,5 to 19,5 — 6,5 to 8,5 —
4890-202-09-X X53CrMnNiN21-9-4 A34V 0,48 to 0,58 0,35 8,0 to 10,0 0,040 0,030 0,35 to 0,50 20,0 to 22,0 — 3,25 to 4,5 —
4648-315-77-I X6CrNiSiCuMo19-13-3-3-1 A33I 0,08 2,50 to 4,0 2,00 0,045 0,030 — 17,0 to 20,5 0,50 to 1,50 11,0 to 14,0 Cu: 1,50 to 3,5
b c
4404-316-03-I X2CrNiMo17-12-2 A31A (21) 0,030 1,00 2,00 0,045 0,030 0,10 16,5 to18,5 2,00 to 3,00 10,0 to 13,0 —
b c
4432-316-03-I X2CrNiMo17-12-3 A32A (22) 0,030 1,00 2,00 0,045 0,030 0,10 16,5 to18,5 2,50 to 3,00 10,5 to 13,0 —
4435-316-91-I X2CrNiMo18-14-3 A35A (23) 0,030 1,00 2,00 0,045 0,030 0,10 17,0 to 19,0 2,50 to 3,00 12,5 to 15,0 —
b c
4406-316-53-I X2CrNiMoN17-11-2 A30B (25) 0,030 1,00 2,00 0,045 0,030 0,12 to 0,22 16,5 to 18,5 2,00 to 3,00 10,0 to 12,5 —

Table 1 (continued)
a
Steel designation
% (mass fraction)
ISO number ISO name Line (old) C Si Mn P S N Cr Mo Ni Others
a) Austenitic steel
4665-316-76-J X6CrNiMoCu18-12-2-2 A32I 0,08 1,00 2,00 0,045 0,030 — 17,0 to 19,0 1,20 to 2,75 10,0 to 14,0 Cu: 1,00 to 2,50
4647-316-75-X X2CrNiMoCu18-14-2-2 A34A 0,030 1,00 2,00 0,045 0,030 — 17,0 to 19,0 1,20 to 2,75 12,0 to 16,0 Cu: 1,00 to 2,50
4578-316-76-E X3CrNiCuMo17-11-3-2 A30F 0,04 1,00 2,00 0,045 0,015 0,10 16,5 to17,5 2,00 to 2,50 10,0 to 11,0 Cu: 3,0 to 3,5
b c
4429-316-53-I X2CrNiMoN17-12-3 A32B (26) 0,030 1,00 2,00 0,045 0,030 0,12 to 0,22 16,5 to 18,5 2,50 to 3,00 10,5 to 13,0 —
b
4401-316-00-I X5CrNiMo17-12-2 A31I (30) 0,08 1,00 2,00 0,045 0,030 0,10 16,0 to 18,0 2,00 to 3,00 10,0 to 13,0 —
b c
4436-316-00-I X3CrNiMo17-12-3 A32F (31) 0,05 1,00 2,00 0,045 0,030 0,10 16,5 to 18,5 2,50 to 3,00 10,5 to 13,0 —
4449-316-76-E X3CrNiMo18-12-3 A33F 0,035 1,00 2,00 0,045 0,015 0,08 17,0 to 18,2 2,25 to 2,75 11,5 to 12,5 Cu: 1,00
4910-316-77-E X3CrNiMoBN17-13-3 A33G 0,04 0,75 2,00 0,035 0,015 0,10 to 0,18 16,0 to 18,0 2,00 to 3,0 12,0 to 14,0 B: 0,001 5 to 0,005 0
4494-316-74-J X6CrNiMoS17-12-3 A32K 0,08 1,00 2,00 0,045 W 0,10 — 16,0 to 18,0 2,00 to 3,0 10,0 to 14,0 —
4495-316-51-J X6CrNiMoN17-12-3 A32H 0,08 1,00 2,00 0,045 0,030 0,10 to 0,22 16,0 to 18,0 2,00 to 3,0 10,0 to 14,0 —
b c
4571-316-35-I X6CrNiMoTi17-12-2 A31F (32) 0,08 1,00 2,00 0,045 0,030 — 16,5 to 18,5 2,00 to 2,50 10,5 to 13,5 Ti: 5xC to 0,70
b
4580-316-40-I X6CrNiMoNb17-12-2 A31G (33) 0,08 1,00 2,00 0,045 0,030 — 16,5 to 18,5 2,00 to 2,50 10,5 to 13,5 Nb: 10xC to 1,00
4879-317-77-J X30CrNiMoPB20-11-2 A33R 0,25 to 0,35 1,00 1,20 0,18 to 0,25 0,030 — 19,0 to 21,0 1,8 to 2,50 10,0 to 12,0 B: 0,001 to 0,010
b
4438-317-03-I X2CrNiMo19-14-4 A37A (24) 0,030 1,00 2,00 0,045 0,030 0,10 17,5 to 20,0 3,0 to 4,0 12,0 to 15,0 —

4439-317-26-E X2CrNiMoN17-13-5 A35B 0,030 1,00 2,00 0,045 0,015 0,12 to 0,22 16,5 to 18,5 4,0 to 5,0 12,5 to 14,5 —

4483-317-26-I X2CrNiMoN18-15-5 A38A (28) 0,030 1,00 2,00 0,045 0,030 0,10 to 0,20 17,0 to 20,0 4,0 to 5,0 13,5 to 17,5 —
b c
4434-317-53-I X2CrNiMoN18-12-4 A34B (27) 0,030 1,00 2,00 0,045 0,030 0,10 to 0,20 17,5 to 20,0 3,00 to 4,0 11,0 to 14,0 —
4445-317-00-U X6CrNiMo19-13-4 A36I 0,08 1,00 2,00 0,045 0,030 0,10 18,0 to 20,0 3,0 to 4,0 11,0 to 15,0 —
4476-317-92-X X3CrNiMo18-16-5 A39F 0,04 1,00 2,50 0,045 0,030 — 16,0 to 19,0 4,0 to 6,0 15,0 to 17,0 —
4824-308-09-J X20CrNiN22-11 A33Q 0,15 to 0,25 1,00 1,00 to 1,60 0,040 0,030 0,15 to 0,30 20,5 to 22,5 — 10,0 to 12,0 —
4950-309-08-E X6CrNi23-13 A36J 0,04 to 0,08 0,70 2,00 0,035 0,015 0,10 22,0 to 24,0 — 12,0 to 15,0 —
4833-309-08-I X18CrNi23-13 A36R 0,20 1,00 2,00 0,045 0,030 0,10 22,0 to 24,0 — 12,0 to 15,0 —
4496-309-51-J X4CrNiMoN25-14-1 A40F 0,06 1,50 2,00 0,045 0,030 0,25 to 0,40 23,0 to 26,0 0,50 to 1,20 12,0 to 16,0 —
4335-310-02-I X1CrNi25-21 A46A (12) 0,020 0,25 2,00 0,025 0,010 0,10 24,0 to 26,0 0,20 20,0 to 22,0 —
4951-310-08-I X6CrNi25-20 A45L 0,04 to 0,10 0,70 2,00 0,035 0,015 0,10 24,0 to 26,0 — 19,0 to 22,0 —
4845-310-08-E X8CrNi25-21 A46L 0,10 1,50 2,00 0,045 0,030 0,10 24,0 to 26,0 — 19,0 to 22,0 —

6 © ISO 2010 – All rights reserved
Table 1 (continued)
a
Steel designation
% (mass fraction)
ISO number ISO name Line (old) C Si Mn P S N Cr Mo Ni Others
a) Austenitic steel
4845-310-09-X X23CrNi25-21 A46O 0,25 1,50 2,00 0,040 0,030 — 24,0 to 26,0 — 19,0 to 22,0 —
4841-314-00-E X15CrNiSi25-21 A46R 0,20 1,50 to 2,50 2,00 0,045 0,015 0,10 24,0 to 26,0 — 19,0 to 22,0 —
4466-310-50-E X1CrNiMoN25-22-2 A49A (29) 0,020 0,70 2,00 0,025 0,010 0,10 to 0,16 24,0 to 26,0 2,00 to 2,50 21,0 to 23,0 —
A45A (34)
4547-312-54-I X1CrNiMoCuN20-18-7 0,020 0,70 1,00 0,035 0,015 0,18 to 0,25 19,5 to 20,5 6,0 to 7,0 17,5 to 18,5 Cu: 0,50 to 1,00
Cu: 1,00 to 2,00
4659-312-66-I X1CrNiMoCuNW24-22-6 A52B (41) 0,020 0,70 2,0 to 4,0 0,030 0,010 0,35 to 0,50 23,0 to 25,0 5,5 to 6,5 21,0 to 23,0
W: 1,50 to 2,50
4652-326-54-I X1CrNiMoCuN24-22-8 A54A (38) 0,020 0,50 2,0 to 4,0 0,030 0,005 0,45 to 0,55 23,0 to 25,0 7,0 to 8,0 21,0 to 23,0 Cu: 0,30 to 0,60
4565-345-65-I X2CrNiMnMoN25-18-6-5 A54B (42) 0,030 1,00 5,0 to 7,0 0,030 0,015 0,30 to 0,60 24,0 to 26,0 4,0 to 5,0 16,0 to 19,0 Nb: 0,15
Co:18,5 to 21,0
X12CrNiCoMoWMnNNb21-
4971-314-79-I A64R 0,08 to 0,16 1,00 1,00 to 2,00 0,035 0,015 0,10 to 0,20 20,0 to 22,5 2,50 to 3,5 19,0 to 21,0 W: 2,00 to 3,0
20-20-3-3-2
Nb: 0,75 to 1,25
4537-310-92-E X1CrNiMoCuN25-25-5 A55A 0,020 0,70 2,00 0,030 0,010 0,17 to 0,25 24,0 to 26,0 4,7 to 5,7 24,0 to 27,0 Cu: 1,00 to 2,00
4656-089-04-I X1NiCrMoCu22-20-5-2 A47A 0,020 1,00 2,00 0,040 0,030 0,10 19,0 to 21,0 4,0 to 5,0 21,0 to 23,0 Cu: 1,00 to 2,00
4539-089-04-I X1NiCrMoCu25-20-5 A50A (35) 0,020 0,75 2,00 0,035 0,015 0,15 19,0 to 22,0 4,0 to 5,0 23,5 to 26,0 Cu: 1,00 to 2,00
4529-089-26-I X1NiCrMoCuN25-20-7 A52A (37) 0,020 0,75 2,00 0,035 0,015 0,15 to 0,25 19,0 to 21,0 6,0 to 7,0 24,0 to 26,0 Cu: 0,50 to 1,50
4478-083-67-U X2NiCrMoN25-21-7 A53A 0,030 1,00 2,00 0,040 0,030 0,18 to 0,25 20,0 to 22,0 6,0 to 7,0 23,5 to 25,5 Cu: 0,75
Al: 0,20 to 0,50
Co: 0,50
Cu: 0,50
Nb: 0,10
4958-088-77-E X5NiCrAlTi31-20 A51J 0,03 to 0,08 0,70 1,50 0,015 0,010 0,030 19,0 to 22,0 — 30,0 to 32,5
Ti: 0,20 to 0,50
Al+Ti: 0,70
Ni+Co:30,0 to 32,5
4563-080-28-I X1NiCrMoCu31-27-4 A62A (36) 0,020 0,70 2,00 0,030 0,010 0,10 26,0 to 28,0 3,0 to 4,0 30,0 to 32,0 Cu: 0,70 to 1,50
Al: 0,15 to 0,60
4876-088-00-I X8NiCrAlTi32-21 A53L (54) 0,10 1,00 1,50 0,015 0,015 — 19,0 to 23,0 — 30,0 to 34,0 Ti:0,15 to 0,60
Cu: 0,70
Al: 0,20 to 0,65
Co: 0,50
4959-088-77-E X8NiCrAlTi32-20 A52L 0,05 to 0,10 0,70 1,50 0,015 0,010 0,030 19,0 to 22,0 — 30,0 to 34,0 Cu: 0,50
Ti: 0,20 to 0,65
Ni+Co:30,0 to 34,0
Table 1 (continued)
a
Steel designation
% (mass fraction)
ISO number ISO name Line (old) C Si Mn P S N Cr Mo Ni Others
a) Austenitic steel
Cu: 0,75
Fe: W 39,5
4959-088-10-U X7NiCrAlTi33-21 A54L 0,05 to 0,10 1,00 1,50 0,045 0,015 — 19,0 to 23,0 — 30,0 to 35,0
Ti: 0,15 to 0,60
Al: 0,15 to 0,60
Cu: 0,75
Fe: W 39,5
4959-088-11-U X8NiCrAlTi33-21 A54M 0,06 to 0,10 1,00 1,50 0,040 0,015 — 19,0 to 23,0 — 30,0 to 35,0 Ti: 0,15 to 0,60
Al: 0,15 to 0,60
Al+Ti: 0,85 to 1,2
4864-083-77-X X13NiCr35-16 A51O 0,15 1,50 2,00 0,040 0,030 — 14,0 to 17,0 — 33,0 to 37,0 —
Cu: 3,0 to 4,0
4657-080-20-U X4NiCrCuMo35-20-4-3 A58F 0,07 1,00 2,00 0,045 0,035 — 19,0 to 21,0 2,00 to 3,00 32,0 to 38,0
Nb: (8xC) to 1,00
4854-353-15-E X6NiCrSiNCe35-25 A60J 0,04 to 0,08 1,20 to 2,00 2,00 0,040 0,015 0,12 to 0,20 24,0 to 26,0 — 34,0 to 36,0 Ce: 0,03 to 0,08
e
4479-089-36-U X1NiCrMoMnN34-27-6-5 A72A 0,020 0,50 4,0 to 6,0 0,025 0,010 0,30 to 0,50 26,0 to 28,0 5,0 to 6,0 33,0 to 35,0 Cu: 0,50
b) Austenitic-ferritic (duplex) steels
e
4062-322-02-U X2CrNiN22-2 D24A 0,030 1,00 2,00 0,040 0,010 0,18 to 0,26 21,5 to 24,0 0,45 1,00 to 2,80 —
e
4162-321-01-E X2CrMnNiN21-5-1 D27F 0,040 1,00 4,0 to 6,0 0,040 0,015 0,20 to 0,25 21,0 to 22,0 0,10 to 0,80 1,35 to 1,70 Cu: 0,10 to 0,80
D27B (51)
4362-323-04-I X2CrNiN23-4 0,030 1,00 2,00 0,035 0,015 0,05 to 0,20 22,0 to 24,0 0,10 to 0,60 3,5 to 5,5 Cu: 0,10 to 0,60
4424-315-00-I X2CrNiMoSiMnN19-5-3-2-2 D29A 0,030 1,40 to 2,00 1,20 to 2,00 0,035 0,030 0,05 to 0,10 18,0 to 19,0 2,50 to 3,0 4,3 to 5,2 —
f
4462-318-03-I X2CrNiMoN22-5-3 D30A (52) 0,030 1,00 2,00 0,035 0,015 0,10 to 0,22 21,0 to 23,0 2,50 to 3,5 4,5 to 6,5 —
4481-312-60-J X2CrNiMoN25-7-3 D35A 0,030 1,00 1,50 0,040 0,030 0,08 to 0,30 24,0 to 26,0 2,50 to 3,5 5,5 to 7,5 —
4507-325-20-I X2CrNiMoCuN25-6-3 D34A (53) 0,030 0,70 2,00 0,035 0,015 0,20 to 0,30 24,0 to 26,0 3,0 to 4,0 6,0 to 8,0 Cu: 1,00 to 2,50
4507-325-50-X X3CrNiMoCuN26-6-3-2 D35F 0,04 1,00 1,50 0,040 0,030 0,10 to 0,25 24,0 to 27,0 2,9 to 3,9 4,5 to 6,5 Cu: 1,50 to 2,50
D36A (54)
4410-327-50-E X2CrNiMoN25-7-4 0,030 1,00 2,00 0,035 0,015 0,24 to 0,35 24,0 to 26,0 3,0 to 4,5 6,0 to 8,0 —
Cu: 0,50 to 1,00
4501-327-60-I X2CrNiMoCuWN25-7-4 D36B (56) 0,030 1,00 1,00 0,030 0,010 0,20 to 0,30 24,0 to 26,0 3,0 to 4,0 6,0 to 8,0
W: 0,50 to 1,00
b
4460-312-00-I X3CrNiMoN27-5-2 D34F (55) 0,050 1,00 2,00 0,035 0,030 0,05 to 0,20 25,0 to 28,0 1,30 to 2,00 4,5 to 6,5 —
4480-329-00-U X6CrNiMo26-4-2 D32F 0,08 0,75 1,00 0,040 0,030 — 23,0 to 28,0 1,00 to 2,00 2,5 to 5,0 —
e
4477-329-06-E X2CrNiMoN29-7-2 D38A 0,030 0,80 0,80 to 1,50 0,030 0,030 0,30 to 0,40 28,0 to 30,0 1,50 to 2,60 5,8 to 7,5 Cu: 0,80

8 © ISO 2010 – All rights reserved
Table 1 (continued)
a
Steel designation
% (mass fraction)
ISO number ISO name Line (old) C Si Mn P S N Cr Mo Ni Others
b) Austenitic-ferritic (duplex) steels
Cu: 1,00
e
4658-327-07-U X2CrNiMoCoN28-8-5-1 D42A 0,030 0,50 1,50 0,035 0,010 0,30 to 0,50 26,0 to 29,0 4,0 to 5,0 5,5 to 9,5
Co: 0,50 to 2,00
4485-332-07-U X2CrNiMoN31-8-4 D43A 0,030 0,80 1,50 0,035 0,010 0,40 to 0,60 29,0 to 33,0 3,0 to 5,0 6,0 to 9,0 Cu: 1,00
c) Ferritic steels
4030-410-90-X X2Cr12 F12A 0,030 1,00 1,00 0,040 0,030 — 11,0 to 13,5 — — —
4003-410-77-I X2CrNi12 F12C (61) 0,030 1,00 2,00 0,040 0,015 0,030 10,5 to 12,5 — 0,30 to 1,10 —
j b
4720-409-00-I X2CrTi12 F12B (62) 0,030 1,00 1,00 0,040 0,030 0,030 10,5 to 12,5 — 0,50 Ti: 6x(C+N) to 0,65
4516-409-75-I X6CrNiTi12 F13F (64) 0,08 1,00 2,00 0,040 0,015 0,030 10,5 to 12,5 — 0,50 to 1,50 Ti: 0,05 to 0,35
b
4000-410-08-I X6Cr13 F13G (65) 0,08 1,00 1,00 0,040 0,030 — 11,5 to 14,0 — 0,75 —
b
4002-405-00-I X6CrAl13 F13H (66) 0,08 1,00 1,00 0,040 0,030 — 11,5 to 14,0 — — Al: 0,10 to 0,30
4724-405-77-I X10CrAlSi13 F13L 0,12 0,70 to 1,40 1,00 0,040 0,015 — 12,0 to 14,0 — 1,00 Al: 0,70 to 1,20
4012-429-00-X X10Cr15 F15L 0,12 1,00 1,00 0,040 0,030 — 14,0 to 16,0 — — —
4595-429-71-I X1CrNb15 F15A 0,020 1,00 1,00 0,035 0,015 0,020 14,0 to 16,0 — — Nb: 0,20 to 0,60
4589-429-70-E X5CrNiMoTi15-2 F17H 0,08 1,00 1,00 0,040 0,015 — 13,5 to 15,5 0,2 to 1,2 1,00 to 2,50 Ti: 0,30 to 0,50

g b
4016-430-00-I X6Cr17 F17I (67) 0,08 1,00 1,00 0,040 0,030 — 16,0 to 18,0 — — —
4004-430-20-I X7CrS17 F17L (68) 0,09 1,50 1,50 0,040 W 0,15 — 16,0 to 18,0 0,60 — —
h
4520-430-70-I X2CrTi17 F17A 0,025 0,50 0,50 0,040 0,015 0,015 16,0 to 18,0 — — Ti: 8x(C+N) to 0,60

h
Ti: 8x(C+N) to 0,80
4664-430-75-J X2CrCuTi18 F18A 0,025 1,00 1,00 0,040 0,030 0,025 16,0 to 20,0 — —
Cu: 0,30 to 0,80
Ti: 0,10 to 0,60
4509-439-40-X X2CrTiNb18 F18B 0,030 1,00 1,00 0,040 0,015 — 17,5 to 18,5 — — Nb: 0,30 + 3xC to
1,00
b h
4510-430-35-I X3CrTi17 F17F (70) 0,05 1,00 1,00 0,040 0,030 0,030 16,0 to 19,0 — — Ti: 0,15 to 0,75
4511-430-71-I X3CrNb17 F17G (73) 0,05 1,00 1,00 0,040 0,015 0,030 16,0 to 18,0 — — Nb: 12xC to 1,00
4742-430-77-I X10CrAlSi18 F18N 0,12 0,70 to 1,40 1,00 0,040 0,015 — 17,0 to 19,0 — 1,00 Al: 0,70 to 1,20
4017-430-91-E X6CrNi17-1 F18H 0,08 1,00 1,00 0,040 0,015 — 16,0 to 18,0 — 1,20 to 1,60 —

Table 1 (continued)
a
Steel designation
% (mass fraction)
ISO number ISO name Line (old) C Si Mn P S N Cr Mo Ni Others
c) Ferritic steels
b
4113-434-00-I X6CrMo17-1 F18I (69) 0,08 1,00 1,00 0,040 0,030 — 16,0 to 18,0 0,75 to 1,40 — —
Ti+Nb+Zr: 8x(C+N)
4513-436-00-J X2CrMoNbTi18-1 F19A 0,025 1,00 1,00 0,040 0,030 0,025 16,0 to 19,0 0,75 to 1,50 —
to 0,80
Ti+Nb+Zr: 8x(C+N)
4609-436-77-J X2CrMo19 F19B 0,025 1,00 1,00 0,040 0,030 0,025 17,0 to 20,0 0,40 to 0,80 —
to 0,80
4526-436-00-I X6CrMoNb17-1 F18J (71) 0,08 1,00 1,00 0,040 0,015 0,040 16,0 to 18,0 0,80 to 1,40 — Nb: 5xC to 1,00
Ti: W 4x(C+N) and
4521-444-00-I X2CrMoTi18-2 F20A (72) 0,025 1,00 1,00 0,040 0,015 0,030 17,0 to 20,0 1,75 to 2,50 —
h
0,15 u Ti u 0,75
Ti: 0,30 to 0,80
4523-182-35-I X2CrMoTiS18-2 F20B (74) 0,030 1,00 0,50 0,040 0,15 to 0,35 — 17,5 to 19,0 2,00 to 2,50 —
(C + N) u 0,040
Nb: 0,20 to 1,00
4621-445-00-E X2CrNbCu21 F21A 0,030 1,00 1,00 0,040 0,015 0,030 20, 0 to 21,5 — —
Cu: 0,10 to 1,00
4764-442-72-J X8CrAl19-3 F19N 0,10 1,50 1,00 0,040 0,030 — 17,0 to 21,0 — — Al: 2,00 to 4,0
4128-445-92-J X2CrMo23-1 F24A 0,025 1,00 1,00 0,040 0,030 0,025 21,0 to 24, 0 0,70 to 1,50 — —
4129-445-92-J X2CrMo23-2 F25A 0,025 1,00 1,00 0,040 0,030 0,025 21,0 to 24,0 1,50 to 2,50 — —
4762-445-72-I X10CrAlSi25 F25N 0,12 0,70 to 1,40 1,00 0,040 0,015 — 23,0 to 26,0 — 1,00 Al: 1,20 to 1,70
4749-446-00-I X15CrN26 F26R 0,20 1,00 1,00 0,040 0,030 0,15 to 0,25 24,0 to 28,0 — 1,00 —
4131-446-92-C X1CrMo26-1 F27A 0,010 0,40 0,40 0,030 0,020 0,015 25,0 to 27,5 0,75 to 1,50 — —
(Ti + Nb):
4750-446-60-U X2CrMoNi27-4-2 F33A 0,030 1,00 1,00 0,040 0,030 0,040 25,0 to 28,0 3,0 to 4,0 1,00 to 3,5 0,20 + 6 x (C+N)
to 1,00
4135-447-92-C X1CrMo30-2 F32A 0,010 0,40 0,40 0,030 0,020 0,015 28,5 to 32,0 1,50 to 2,50 — —
d) Martensitic steels
b
4006-410-00-I X12Cr13 M13B (82) 0,08 to 0,15 1,00 1,50 0,040 0,030 — 11,5 to 13,5 — 0,75 —
4024-410-09-E X15Cr13 M13F 0,12 to 0,17 1,00 1,00 0,040 0,015 — 12,0 to 14,0 — — —
4119-410-92-C X13CrMo13 M13G 0,08 to 0,18 0,60 1,00 0,040 0,030 — 11,5 to 14,0 0,30 to 0,60 — —

10 © ISO 2010 – All rights reserved
Table 1 (continued)
a
Steel designation
% (mass fraction)
ISO number ISO name Line (old) C Si Mn P S N Cr Mo Ni Others
d) Martensitic steels
4642-416-72-J X13CrPb13 M13A 0,15 1,00 1,00 0,040 0,030 — 11,5 to 13,5 — — Pb: 0,05 to 0,30
4005-416-00-I X12CrS13 M13C (83) 0,08 to 0,15 1,00 1,50 0,040 W 0,15 — 12,0 to 14,0 0,60 — —
b
4021-420-00-I X20Cr13 M13I (84) 0,16 to 0,25 1,00 1,50 0,040 0,030 — 12,0 to 14,0 — — —
Nb: 0,20 to 0,60
4916-600-77-J X18CrMnMoNbVN12 M12G 0,15 to 0,20 0,50 0,50 to1,00 0,040 0,030 0,05 to 0,10 10,0 to 13,0 0,30 to 0,90 0,60
V: 0,10 to 0,40
V: 0,20 to 0,30
4929-422-00-I X23CrMoWMnNiV12-1-1 M13J 0,20 to 0,25 0,50 0,50 to1,00 0,040 0,025 — 11,0 to12,5 0,75 to 1,25 0,50 to1,00
W: 0,75 to 1,25
4923-422-77-E X22CrMoV12-1 M13H 0,18 to 0,24 0,50 0,40 to 0,90 0,025 0,015 — 11,0 to 12,5 0,8 to 1,2 0,30 to 0,80 V: 0,25 to 0,35
b
4028-420-00-I X30Cr13 M13M (85) 0,26 to 0,35 1,00 1,50 0,040 0,030 — 12,0 to 14,0 — — —
4029-420-20-I X33CrS13 M13N 0,25 to 0,40 1,00 1,50 0,060 W 0,15 — 12,0 to 14,0 0,60 0,60 —
4643-420-72-J X33CrPb13 M13O 0,26 to 0,40 1,00 1,00 0,040 0,030 — 12,0 to 14,0 — — Pb: 0,05 to 0,30
b
4031-420-00-I X39Cr13 M13P (86) 0,36 to 0,42 1,00 1,00 0,040 0,030 — 12,5 to 14,5 — — —
4419-420-97-E X38CrMo14 M14P 0,36 to 0,42 1,00 1,00 0,040 0,015 — 13,0 to 14,5 0,60 to 1,00 — —
4123-431-77-E X40CrMoVN16-2 M18T 0,35 to 0,50 1,00 1,00 0,040 0,015 0,10 to 0,30 14,0 to 16,0 1,00 to 2,50 0,50 V: 1,50
b
4034-420-00-I X46Cr13 M13Q (87) 0,43 to 0,50 1,00 1,00 0,040 0,030 — 12,5 to 14,5 — — —
4035-420-74-E X46CrS13 M13R 0,43 to 0,50 1,00 2,00 0,040 0,15 to 0,35 — 12,5 to 14,0 — — —
b
4038-420-00-I X52Cr13 M13U (88) 0,48 to 0,55 1,00 1,00 0,040 0,030 — 12,5 to 14,5 — — —
4110-420-69-E X55CrMo14 M14U 0,48 to 0,60 1,00 1,00 0,040 0,015 — 13,0 to 15,0 0,50 to 0,80 — V: 0,15
b
4039-420-09-I X60Cr13 M13V (89) 0,56 to 0,65 1,00 1,00 0,040 0,030 — 12,5 to 14,5 — — —
4313-415-00-I X3CrNiMo13-4 M17A (81) 0,05 0,70 0,50 to 1,00 0,040 0,015 — 12,0 to 14,0 0,30 to 1,00 3,5 to 4,5 —
Ti: 0,010
4415-415-92-E X2CrNiMoV13-5-2 M20A 0,030 0,50 0,50 0,040 0,015 — 11,5 to 13,5 1,50 to 2,50 4,5 to 6,5
V: 0,10 to 0,50
4116-420-77-E X50CrMoV15 M15U 0,45 to 0,55 1,00 1,00 0,040 0,015 — 14,0 to 15,0 0,50 to 0,80 — V: 0,10 to 0,20
4057-431-00-X X17CrNi16-2 M18G (91) 0,12 to 0,22 1,00 1,50 0,040 0,030 — 15,0 to 17,0 — 1,50 to 2,50 —
4058-429-99-J X33Cr16 M16O 0,25 to 0,40 1,00 1,00 0,040 0,030 — 15,0 to 17,0 — — —
4418-431-77-E X4CrNiMo16-5-1 M22A 0,06 0,70 1,50 0,040 0,015 W 0,020 15,0 to 17,0 0,80 to 1,50 4,0 to 6,0 —

Table 1 (continued)
a
Steel designation
% (mass fraction)
ISO number ISO name Line (old) C Si Mn P S N Cr Mo Ni Others
d) Martensitic steels
4019-430-20-I X14CrS17 M17F (90) 0,10 to 0,17 1,00 1,50 0,040 W 0,15 — 16,0 to 18,0 0,60 — —
4122-434-09-I X39CrMo17-1 M18R (92) 0,33 to 0,45 1,00 1,50 0,040 0,015 — 15,5 to 17,5 0,80 to 1,30 1,00 —
4040-440-02-X X68Cr17 M17U 0,60 to 0,75 1,00 1,00 0,040 0,030 — 16,0 to 18,0 0,75 0,60 —
4041-440-03-X X85Cr17 M17V 0,75 to 0,95 1,00 1,00 0,040 0,030 — 16,0 to 18,0 0,75 0,60 —
4023-440-04-I X110Cr17 M17W 0,95 to 1,20 1,00 1,00 0,040 0,030 — 16,0 to 18,0 0,75 0,60 —
4025-440-74-X X110CrS17 M17Z 0,95 to 1,20 1,00 1,25 0,060 W 0,15 — 16,0 to 18,0 0,75 0,60 —
4766-440-77-X X80CrSiNi20-2 M20U 0,75 to 0,85 1,75 to 2,25 0,20 to 0,60 0,030 0,030 — 19,0 to 20,50 — 1,15 to 1,65 —
e) Precipitation-hardening steels
Cu: 1,20 to 2,00
4594-155-92-E X5CrNiMoCuNb14-5 P19I 0,07 0,70 1,00 0,040 0,015 — 13,0 to 15,0 1,20 to 2,00 5,0 to 6,0
Nb: 0,15 to 0,60
Cu: 3,0 to 5,0
b
4542-174-00-I X5CrNiCuNb16-4 P20I (101) 0,07 1,00 1,50 0,040 0,030 — 15,0 to 17,0 0,60 3,0 to 5,0
Nb: 0,15 to 0,45
i
4568-177-00-I X7CrNiAl17-7 P24L (102) 0,09 1,00 1,00 0,040 0,015 — 16,0 to 18,0 — 6,5 to 7,8 Al: 0,70 to 1,50
Ti: 0,28 to 0,37
4530-455-77-E X1CrNiMoAlTi12-9-2 P23A 0,015 0,10 0,10 0,010 0,005 0,01 11,5 to 12,5 1,85 to 2,15 8,5 to 9,5
Al: 0,60 to 0,80
Ti: 0,28 to 0,40
4596-455-77-E X1CrNiMoAlTi12-10-2 P24A 0,015 0,10 0,10 0,010 0,005 0,02 11,5 to 12,5 1,85 to 2,15 9,2 to 10,2
Al: 0,80 to 1,10
4532-157-00-I X8CrNiMoAl15-7-2 P24M (103) 0,10 1,00 1,20 0,040 0,015 — 14,0 to 16,0 2,00 to 3,00 6,5 to 7,8 Al: 0,75 to 1,50
4534-138-00-X X3CrNiMoAl13-8-3 P24H 0,05 0,10 0,20 0,010 0,008 0,010 12,3 to 13,2 2,00 to 3,00 7,5 to 8,5 Al: 0,90 to 1,35
Al: 0,15 to 0,50
e
4645-469-10-U X2CrNiMoCuAlTi12-9-4-3 P25A 0,030 0,70 1,00 0,030 0,015 — 11,0 to 13,0 3,5 to 5,0 8,0 to 10,0 Cu: 1,50 to 3,5
Ti: 0,50 to 1,20
4457-350-00-X X9CrNiMoN17-5-3 P25M 0,07 to 0,11 0,50 0,50 to 1,25 0,040 0,030 0,07 to 0,13 16,0 to 17,0 2,5 to 3,2 4,0 to 5,0 —
Ti: 1,90 to 2,35
Al: 0,35
4980-662-86-X X6NiCrTiMoVB25-15-2 P42J 0,08 1,00 2,00 0,040 0,030 — 13,5 to 16,0 1,00 to 1,50 24,0 to 27,0
V: 0,10 to 0,50
B: 0,001 to 0,010
Ti: 1,80 to 2,10
4644-662-20-U X4NiCrMoTiMnSiB26-14-3-2 P43J 0,08 0,40 to 1,00 0,40 to 1,00 0,040 0,030 — 12,0 to 15,0 2,0 to 3,5 24,0 to 28,0 Al: 0,35
B: 0,001 to 0,010
12 © ISO 2010 – All rights reserved
Table 1 (continued)
a
Steel designation
% (mass fraction)
ISO number ISO name Line (old) C Si Mn P S N Cr Mo Ni Others
a
Maximum values unless indicated otherwise.
b
Particular ranges of sulfur mass fraction may provide improvement of particular properties. For machinability, a controlled sulfur mass fraction of 0,015 % to 0,030 % is recommended. For weldability, a controlled sulfur
mass fraction of 0,008 % to 0,020 % may be beneficial. For polishability, a controlled sulfur mass fraction of 0,015 % maximum is recommended.
c
Where, for special reasons (e.g., hot workability or low magnetic permeability), it is necessary to minimize the ferrite mass fraction, the maximum nickel mass fraction may be increased by the following amounts:
— by 0,50 % for steels in lines (old) 01, 06 and 32;
— by 1,00 % for steels in lines (old) 02, 16, 17, 19, 20, 25, 26, 27 and 31;
— by 1,50 % for steels in lines (old) 21 and 22.
d
Copper may be added up to 1,00 %. If it is added, it must be reported in the inspection document, provided such a document has been ordered.
e
Patented grade.
f
For special applications, the lower limits of N, Cr and Mo can be limited to 0,14 %, 22,0 % and 3,0 %.
g
For certain applications, e.g. weldability or high-strength wire, a maximum of 0,12 % C may be agreed upon.
h
Stabilization may be obtained by the use of titanium or niobium or zirconium. The equivalence shall be the following: Nb [% (mass fraction)] = Zr [% (mass fraction)] = 7/4 Ti [% (mass fraction)].
i
By special agreement, the steel, when intended for cold deformation, may also be ordered with 7,00 % to 8,30 % Ni.
j
S40900 (4720-409-00) has been replaced by S40971, S40978 and S40979. Unless otherwise specified in the ordering information, an order specifying S40900 shall be satisfied by any one of S40971 [with Ti:
6x(C+N) to 0,50, Nb: u 0,17], S40978 [with 8x(C+N) u Ti, Ti: 0,15 to 0,50 and Nb: u 0,10] or S40979 [with 0,08 + 8x(C+N) u (Nb +Ti) u 0,75 and 0,05 u Ti] at the option of the seller. Material meeting the requirements of
S40971, S40978 and S40979 may, at the option of the manufacturer, be certified as S40900.

Table 2 — Principles used for allocation of the last two digits of the ISO steel
designation according to this International Standard
Last two digits Allocation
03, 90 Low carbon
91 Low carbon, increased nickel
25, 50, 54, 92 Low carbon, increased molybdenum
93 Low carbon, increased nickel and molybdenum
53, 50, 54, 94 Low carbon, increased nitrogen
95 Low carbon, increased molybdenum and nitrogen
00, 96 Normal carbon
97 Normal carbon, increased molybdenum
51, 98 Normal carbon, increased nitrogen
09 High carbon
35, 36, 70 Titanium addition
40, 41, 42, 71 Niobium (columbium) addition
23, 72 Addition of cerium or aluminium or silicon or selenium or lead
73 High carbon, increased nickel
20, 74 Sulfur addition
75 Low carbon, copper addition
76 Normal carbon, copper addition
77 Miscellaneous
78 Miscellaneous
79 Miscellaneous
Table 3 — Rules for allocating the last letter of the ISO steel designation
according to this International Standard
Last digit A Allocation
Grade origin is a standard in Europe and grade is defined by the
E
“Stahl-Eisen-Liste”
Grade origin is a standard in the United States of America and
U
grade is defined by an existing UNS number
J Grade origin is a standard in Japan (appears in a JIS standard)
Grade origin is a standard in China
C
(appears in a Chinese National Standard)
I First definition of the composition in this International Standard
X Grade composition fulfils 2 or more of the above E, U, J, C criteria
Table 4 — Examples of ISO steel designations according to this International Standard
ISO designation Explanations
4307-304-03-I The designation ends with I: composition is defined by this International Standard:
⎯ this is a “compromise” composition between existing standards;
⎯ the composition defined in Europe as EN 1.4307 and in the US as S30403 are considered as
close matches to this ISO grade.
NOTE As stated in Table A.3: standardized compositions that are close matches also exist in the JIS
standard (grade SUS304L) and in Chinese National Standard (grade S30403). Ending of the designation with 03

refers to the low carbon content.
4325-302-00-E
The designation ends with E: grade origin is a European standard:
⎯ the ISO composition is identical to the existing standardized European grade: 1.4325;
⎯ the composition defined by UNS grade S30200 is a close match to this ISO grade.
NOTE As stated in Table A.3: standardized compositions that are close matches also exist in the JIS
standard (grade SUS302) and in the Chinese standard (Chinese grade S30210). The steel composition should
also be checked with former AISI 302, now designated as S30200 under the UNS system.
4959-088-10-U The designation ends with U: grade origin is a standard of the USA:
⎯ the ISO composition is identical to the existing standardized grade UNS N08810;
⎯ the composition defined in Europe as EN 1.4959 is a close match to this ISO grade.
NOTE As stated in Table A.3: standardized compositions that are close matches also exist in the JIS
standard (grade NCF800H). Grade UNS N08810 is listed in Table A.3.
4494-316-74-J The designation ends with J: grade origin is a Japanese standard :
⎯ the ISO composition is identical to the existing SUS316F grade standardized by JIS as
shown in Table A.3;
⎯ the composition defined in Europe as EN 1.4494 is a close match to this ISO grade.

NOTE Ending of the designation with 20 refers to the addition of sulfur.
4040-440-02-X The designation ends with X: grade origin is a standard of China and of Japan:
⎯ the ISO composition is identical to the existing Chinese standardized grade S44070 listed in
GB/T20878 and is identical to Japanese grade SUS440A listed in a JIS standard;
⎯ the composition defined in Europe as 1.4040 in the “Stahl-Eisen-Liste” and is identical to the
ISO grade;
⎯ composition defined in UNS as S44002 has a wider match to this ISO grade.

NOTE Ending of the designation with 02 refers to a high carbon level.
4665-316-76-J The designation ends with J: grade origin is a Japanese standard:
⎯ the ISO composition is identical to the existing SUS316J1 grade standardized by JIS;
⎯ the composition is introduced in the “Stahl-Eisen-Liste” as grade 1.4665;
⎯ ending with the digits 76 refers to the addition of Cu compared to the general 316 grades.

14 © ISO 2010 – All rights reserved

Annex A
(informative)
Designation of the steels given in Table 1 and of comparable grades
covered in various designation systems
Table A.1 — Designations of the steels given in Table 1 and of comparable grades covered
in various designation systems
a
Steel designations according to
d
ISO number ISO name Line ASTM A959/ EN 10088-1:2005 JIS GB/T20878/
b c e
(old) UNS Number ISC
f f f f
I/N/W I/N/W I/N/W I/N/W
a) Austenitic steels
4318-301-53-I X2CrNiN18-7 A25A (04) S30153 W 1.4318 N SUS301L W S30153 W
4319-301-00-I X5CrNi17-7 A24H (05) S30100 W 1.4319 I SUS301 W S30110 W
4310-301-00-I X10CrNi18-8 A26L (11) S30100 W 1.4310 N — — S30110 W
4325-302-00-E X9CrNi18-9 A27N S30200 W 1.4325 I SUS302 W S30210 W
4326-302-15-I X12CrNiSi18-9-3 A27P (46) S30215 W (1.4326) I SUS302B I S30240 N
4307-304-03-I X2CrNi18-9 A27B (01) S30403 W 1.4307 N SUS304L W S30403 W
4306-304-03-I X2CrNi19-11 A30A (02) S30403 W 1.4306 N SUS304L W S30403 N
4311-304-53-I X2CrNiN18-9 A27A (03) S30453 W 1.4311 N SUS304LN W S30453 W
4301-304-00-I X5CrNi18-10 A28E (06) S30400 W 1.4301 I SUS304 W S30408 W
4315-304-51-I X5CrNiN19-9 A28F (10) S30451 N 1.4315 W SUS304N1 W S30458 W
4948-304-09-I X7CrNi18-9 A27L (07) S30409 W 1.4948 W SUS304H W S30409 W
4818-304-15-E X6CrNiSiNCe19-10 A29J S30415 W 1.4818 I — — S30450 N
4650-304-75-E X2CrNiCu19-10 A29A — — 1.4650 I SUS304L W S30403 W
4649-304-76-J X6CrNiCu19-9-1 A28I — — (1.4649) I SUS304Cu I S30488 W
4305-303-00-I X10CrNiS18-9 A27M (14) S30300 W 1.4305 W SUS303 W S30317 W
4625-303-23-X X12CrNiSe18-9 A27O S30323 I (1.4625) I SUS303Se I S30327 I
4570-303-31-I X6CrNiCuS18-9-2 A27I (44) S30331 I 1.4570 N — — — —
4667-303-76-J X12CrNiCuS18-9-3 A27Q — — (1.4667) I SUS303Cu I — —
4615-201-75-E X3CrMnNiCu15-8-5-3 A28C — — 1.4615 I — — — —
4541-321-00-I X6CrNiTi18-10 A28G (16) S32100 W 1.4541 I SUS321 W S32168 W
4940-321-09-I X7CrNiTi18-10 A28O (17) S32109 W 1.4940 N SUS321H W S32169 N
4941-321-09-I X6CrNiTiB18-10 A28J (18) S32109 W 1.4941 W — — S32169 W
4550-347-00-I X6CrNiNb18-10 A28H (19) S34700 I 1.4550 N SUS347 W S34778 N
4912-347-09-I X7CrNiNb18-10 A28K (20) S34709 W 1.4912 N SUS347H W S34779 W
4961-347-77-E X8CrNiNb16-13 A29L — — 1.4961 I — — — —
4567-304-30-I X3CrNiCu18-9-4 A27F (15) S30430 W 1.4567 N SUSXM7 W S30488 W
4567-304-76-I X6CrNiCu17-8-2 A25J (45) — — 1.4567 W SUS304J1 I S30480 W
4567-304-98-X X6CrNiCu18-9-2 A27J — — 1.4567 W SUS304J3 I S30480 I
4660-315-77-I X6CrNiCuSiMo19-10-3-2 A30J — — (1.4660) I SUS315J1 N — —
Table A.1 (continued)
a
Steel designations a
...