ISO 2107
(Main)Aluminium and aluminium alloys — Wrought products — Temper designations
Aluminium and aluminium alloys — Wrought products — Temper designations
ISO 2107:2007 establishes temper designations as required for identification for all product forms of wrought aluminium and aluminium alloys.
Aluminium et alliages d'aluminium — Produits corroyés — Désignation des états métallurgiques
L'ISO 2107:2007 établit une désignation des états métallurgiques comme exigée pour l'identification de toutes les formes de produits corroyés en aluminium et en alliages d'aluminium.
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INTERNATIONAL ISO
STANDARD 2107
Fourth edition
2023-xx-01
Aluminium and aluminium alloys —
Wrought products — Temper designations
Aluminium et alliages d'aluminium — Produits corroyés —
Désignation des états métallurgiques
Reference number
Title:
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ISO/FDIS 2107
ISO/TC 79/SC 9
Secretariat: ANSI
Date: 2023-06-14
Aluminium and aluminium alloys — Wrought products — Temper
designations
Aluminium et alliages d'aluminium — Produits corroyés — Désignation des états métallurgiques
FDIS stage
Reference number
Title:
From AutoCAD Dr
Creator:
TeXMathEditor par
Preview:
This EPS picture w
---------------------- Page: 2 ----------------------
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this
publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including
photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested
from either ISO at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
E-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
iii
---------------------- Page: 3 ----------------------
Contents Page
Foreword . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic temper designations . 2
4.1 F — as fabricated . 3
4.2 O — annealed. 3
4.3 H — strain-hardened . 3
4.4 W — solution heat-treated. 3
4.5 T — precipitation hardened to produce stable tempers other than F, O or H . 3
5 Subdivisions of O temper designations . 3
5.1 O1 — high-temperature annealed to accentuate ultrasonic response and provide dimensional
stability . 4
5.2 O3 — homogenized . 4
6 Subdivisions of H temper designations . 4
6.1 General . 4
6.2 First digit after H . 4
6.3 Second digit after H . 5
6.4 Third digit after H . 6
6.5 Other digits after H . 7
7 Subdivisions of T temper designations . 7
7.1 First digits (numerals 1 to 10) after T . 7
7.2 Additional digits added to designations T1 to T10 . 9
7.3 Assigned additional digits for stress-relieved T tempers . 9
7.3.1 Stress-relieved by stretching . 9
7.3.2 Stress relieved by compressing . 10
7.3.3 Stress relieved by combined stretching and compressing . 10
7.4 Assigned additional digits for stress-relieved W tempers . 10
7.5 Assigned additional digits for variations of T7 type tempers . 10
7.6 Assigned additional digits for producer/supplier demonstration tempers and purchaser/user
processed tempers . 11
7.6.1 Temper designations for producer/supplier — Laboratory demonstration of response to heat
treatment . 11
7.6.2 Temper designations for producer/supplier — Demonstration of response to temper conversion
12
7.6.3 Temper designations for purchaser/user heat treatment . 12
Annex A (informative) Common, regionally applied temper designations and descriptions . 2
iv
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Foreword iv
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Basic temper designations 2
4.1 F — as fabricated 2
4.2 O — annealed 3
4.3 H — strain-hardened 3
4.4 W — solution heat-treated 3
4.5 T — precipitation hardened to produce stable tempers other than F, O or H 3
5 Subdivisions of O temper designations 3
5.1 O1 — high-temperature annealed to accentuate ultrasonic response and provide dimensional
stability 3
5.2 O3 — homogenized 3
6 Subdivisions of H temper designations 4
6.1 General 4
6.2 First digit after H 4
6.3 Second digit after H 4
6.4 Third digit after H 5
6.5 Other digits after H 6
7 Subdivisions of T temper designations 6
7.1 First digits (numerals 1 to 10) after T 6
7.2 Additional digits added to designations T1 to T10 8
7.3 Assigned additional digits for stress-relieved T tempers 8
7.4 Assigned additional digits for stress-relieved W tempers 9
7.5 Assigned additional digits for variations of T7 type tempers 9
7.6 Assigned additional digits for producer/supplier demonstration tempers and purchaser/user
processed tempers 11
v
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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 drawnThe procedures used to develop this document and those intended for its further
maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria
needed for the different types of ISO document should be noted. This document was drafted in accordance
with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that some of the elementsimplementation of this document may
beinvolve the subjectuse of (a) patent(s). ISO takes no position concerning the evidence, validity or
applicability of any claimed patent rights. in respect thereof. As of the date of publication of this document,
ISO had not received notice of (a) patent(s) which may be required to implement this document. However,
implementers are cautioned that this may not represent the latest information, which may be obtained from
the patent database available at www.iso.org/patents. ISO shall not be held responsible for identifying any
or all such patent rights.
ISO 2107Any trade name used in this document is information given for the convenience of users and does
not constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 79, Light metals and their alloys,
Subcommittee SC 9, Symbolization.
This fourth edition cancels and replaces the third edition (ISO 2107:2007), which has been technically
revised by the addition of normative references section, updates to terms and definitions, basic temper
definitions, subdivisions and Annex A. .of which it constitutes a minor revision. The changes are as follows:
vi
---------------------- Page: 6 ----------------------
Aluminium and aluminium alloys — Wrought products — Temper
designations
— Clause 2 has been added;
— some terms and definitions have been updated and some new terms have been added in Clause 3;
— Clause 4 has been modified to "Basic temper" with some definitions updated and subdivisions added;
— Annex A has been added.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
vii
---------------------- Page: 7 ----------------------
Aluminium and aluminium alloys — Wrought products — Temper
designations
1 Scope
This International Standarddocument establishes temper designations as required for identification for all
product forms of wrought aluminium and aluminium alloys.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
temper
condition of the metal produced by mechanical and/or thermal processing, or both, typically characterized
by a certain structure and specified properties
3.2
working
forming of solid metal
3.3
hot working
forming of solid metal after pre-heating
Note 1 to entry: Strain hardening maywill or maywill not occur during hot working.
3.4
cold working
forming of solid metal without preheating
Note 1 to entry: Plastic deformation of metal at such temperature and strain-rate that strain hardening occurs.
3.5
strain-hardening
modification of a metal structure, by cold working, resulting in an increase in strength and hardness,
generally with loss of ductility
1
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ISO 2107:2007(E)ISO/FDIS 2107:2023(E)
3.6
solution heat-treating
heating of an alloy at a suitable temperature for a sufficient time to allow one or more soluble constituents
to enter into solid solution, where they are retained in a supersaturated state after quenching (rapid cooling)
3.7
ageing
treatment of a metal aiming at a change in its properties by precipitation of intermetallic phases from
supersaturated solid solution
Note 1 to entry: Ageing can be a treatment at room temperature (natural ageing) or a thermal treatment (artificial
ageing)).
3.8
annealing
thermal treatment to soften metal by reduction or removal of strain hardening resulting from cold working
and/or by coalescing precipitates from solid solution
3.9
heat treatable alloy
alloy which can be strengthened by a suitable thermal treatment
3.10
non-heat-treatable alloy
alloy which is strengthened by working and not by thermal treatment
3.11
stress-relieving
reduction of internal residual stresses by thermal or mechanical means
4 Basic temper designations
The temper designations are based on the sequences of basic treatments used to produce the various
tempers. Property limits (mechanical or physical) apply to individual alloy-temper-product combinations.
Regional temper designations are provided in Annex A.
The temper designation follows the alloy designation; these are separated by a hyphen.
Basic temper designations consist of letters. If subdivisions of the basic tempers are required, these are
indicated by one or more digits following the letter of the basic temper. These digits relate to a specific
sequence of basic treatments, but only those treatments or operations recognized as significantly influencing
the product characteristics are indicated.
Should some other variation of the same sequence of basic operations be applied to the same alloy, resulting
in different characteristics, then additional digits are added to the designation.
Throughout this International Standarddocument, generalized examples of tempers are shown, as follows:
— “X” denotes an unspecified digit (e.g.,. H2X is generalized to indicate appropriate temper designations in
the series H21 to H29);
2
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ISO 2107:2007(E) ISO/FDIS 2107:2023(E)
— “XX” denotes two unspecified digits (e.g.,. HXX4 is generalized to indicate appropriate temper
designations in the H114 to H194 series, the H224 to H294 series, and the H324 to H394 series);
— “_” denotes one or multiple unspecified digits (e.g.,. T_51 is generalized to indicate appropriate temper
designations such as T351, T651, T6151, T7351, T7651, etc.).
4.1 F — as fabricated
This designation applies to the products of shaping processes in which no special control over thermal
conditions or strain-hardening is employed. For wrought products, there are no mechanical property limits
specified.
4.2 O — annealed
This designation applies to wrought products that are annealed to obtain the lowest strength temper, and
to cast products that are annealed to improve ductility and dimensional stability. The O may be followed by
1)
a digit other than zero to indicate a product in the annealed condition having special characteristics.
NOTE Products achieving the required annealed properties after hot forming processes can be designated as O
temper.
4.3 H — strain-hardened
This designation applies to products that have their strength increased by strain-hardening with or without
supplementary thermal treatments to produce some reduction in strength. The letter H is always followed
by at least two digits, the first indicating the specific combination of basic operations and the second
indicating the degree of strain hardening. A third digit indicates a variation of a two-digit temper and is used
when the mechanical properties, or other characteristics, differ from those of the two-digit H temper to
which it is added.
4.4 W — solution heat-treated
This designation describes an unstable temper applicable only to alloys that spontaneously age at room
temperature after solution heat-treatment. This designation is specific only when the period of natural
ageing is indicated, e.g.,. W 1/2 hr.
4.5 T — precipitation hardened to produce stable tempers other than F, O or H
This designation applies to products that are precipitation hardened, with or without supplementary strain
hardening, to produce stable tempers. The T is always followed by one or more digits indicating the specific
sequence of treatments.
5 Subdivisions of O temper designations
A digit following the O, when used, indicates a product in the annealed condition having special
characteristics. Note to entry: As the O temper is not part of the strain-hardened (H) series, variations of O
temper shall not apply to products that are strain-hardened after annealing and in which the effect of strain-
hardening is recognized in the mechanical properties or other characteristics.
1)
Products achieving the required annealed properties after hot forming processes may be designated as O
temper.
3
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ISO 2107:2007(E)ISO/FDIS 2107:2023(E)
5.1 O1 — high-temperature annealed to accentuate ultrasonic response and provide
dimensional stability
This designation applies to wrought products that are thermally treated at approximately the same time and
temperature required for solution heat-treatment and slow cooled to room temperature in order to
accentuate ultrasonic response and/or to provide dimensional stability. It is applicable to products that are
to be machined prior to solution heat-treatment by the user. Mechanical property limits are not specified.
5.2 O3 — homogenized
This designation applies to continuously cast drawing stock or strip, which are subjected to a high
temperature soaking treatment to eliminate or reduce segregations, thus improving subsequent formability
and/or response to solution heat-treatment.
6 Subdivisions of H temper designations
6.1 General
Subdivisions are made according to the basic operations described in Clause 4Clause 4 and the final degree
of strain hardening as described in 6.26.2 to 6.5.6.5.
6.2 First digit after H
The first digit following the letter H indicates the specific combination of basic operations as follows:
a) H1X Strain-hardened only.
These designations apply to products that are strain-hardened to obtain the desired strength without
supplementary thermal treatment.
b) H2X Strain-hardened and partially annealed.
These designations apply to products that are strain-hardened more than the desired final amount, and
then reduced in strength to the desired level by partial annealing. For alloys that age-soften at room
temperature, the H2X tempers have the same minimum ultimate tensile strength as the corresponding
H3X tempers. For other alloys, the H2X tempers have the same minimum ultimate tensile strength as
the corresponding H1X tempers and slightly higher elongation.
c) H3X Strain-hardened and stabilized.
These designations apply to products that are strain-hardened and whose mechanical properties are
stabilized either by a low-temperature thermal treatment or as a result of heat introduced during
fabrication. Stabilization usually improves ductility. This designation is applicable only to those alloys
which, unless stabilized, gradually age-soften at room temperature.
d) H4X Strain-hardened and lacquered or painted.
These designations apply to products that are strain-hardened and which are subjected to some thermal
operation during the subsequent painting or lacquering operation. The corresponding H2X or H3X
mechanical property limits apply.
4
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ISO 2107:2007(E) ISO/FDIS 2107:2023(E)
6.3 Second digit after H
The second digit following the designation H1, H2, H3, and H4 indicates the deg
...
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 2107
ISO/TC 79/SC 9
Aluminium and aluminium alloys —
Secretariat: ANSI
Wrought products — Temper
Voting begins on:
2023-06-28 designations
Voting terminates on:
Aluminium et alliages d'aluminium — Produits corroyés —
2023-08-23
Désignation des états métallurgiques
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 2107:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023
---------------------- Page: 1 ----------------------
ISO/FDIS 2107:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 2107
ISO/TC 79/SC 9
Aluminium and aluminium alloys —
Secretariat: ANSI
Wrought products — Temper
Voting begins on:
designations
Voting terminates on:
Aluminium et alliages d'aluminium — Produits corroyés —
Désignation des états métallurgiques
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: +41 22 749 01 11
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: copyright@iso.org
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/FDIS 2107:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
© ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023
---------------------- Page: 2 ----------------------
ISO/FDIS 2107:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic temper designations . 2
4.1 F — as fabricated . 2
4.2 O — annealed . . 3
4.3 H — strainhardened . 3
4.4 W — solution heattreated . 3
4.5 T — precipitation hardened to produce stable tempers other than F, O or H . 3
5 Subdivisions of O temper designations . 3
5.1 O1 — hightemperature annealed to accentuate ultrasonic response and provide
dimensional stability . 3
5.2 O3 — homogenized . . 3
6 Subdivisions of H temper designations . 4
6.1 General . 4
6.2 First digit after H . 4
6.3 Second digit after H . 4
6.4 Third digit after H . 5
6.5 Other digits after H . 6
7 Subdivisions of T temper designations . 6
7.1 First digits (numerals 1 to 10) after T . 6
7.2 Additional digits added to designations T1 to T10 . 8
7.3 Assigned additional digits for stressrelieved T tempers . 8
7.3.1 Stress-relieved by stretching . 8
7.3.2 Stress relieved by compressing . 9
7.3.3 Stress relieved by combined stretching and compressing . 9
7.4 Assigned additional digits for stressrelieved W tempers . 9
7.5 Assigned additional digits for variations of T7 type tempers . 9
7.6 Assigned additional digits for producer/supplier demonstration tempers and
purchaser/user processed tempers . 10
7.6.1 Temper designations for producer/supplier — Laboratory demonstration
of response to heat treatment . 10
7.6.2 Temper designations for producer/supplier — Demonstration of response
to temper conversion . 10
7.6.3 Temper designations for purchaser/user heat treatment . 11
Annex A (informative) Common, regionally applied temper designations and descriptions .12
iii
© ISO 2023 – All rights reserved
---------------------- Page: 3 ----------------------
ISO/FDIS 2107:2023(E)
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 nongovernmental, 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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 79, Light metals and their alloys,
Subcommittee SC 9, Symbolization.
This fourth edition cancels and replaces the third edition (ISO 2107:2007), of which it constitutes a
minor revision. The changes are as follows:
— Clause 2 has been added;
— some terms and definitions have been updated and some new terms have been added in Clause 3;
— Clause 4 has been modified to "Basic temper" with some definitions updated and subdivisions
added;
— Annex A has been added.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
© ISO 2023 – All rights reserved
---------------------- Page: 4 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 2107:2023(E)
Aluminium and aluminium alloys — Wrought products —
Temper designations
1 Scope
This document establishes temper designations as required for identification for all product forms of
wrought aluminium and aluminium alloys.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
temper
condition of the metal produced by mechanical and/or thermal processing, or both, typically
characterized by a certain structure and specified properties
3.2
working
forming of solid metal
3.3
hot working
forming of solid metal after preheating
Note 1 to entry: Strain hardening will or will not occur during hot working.
3.4
cold working
forming of solid metal without preheating
Note 1 to entry: Plastic deformation of metal at such temperature and strain-rate that strain hardening occurs.
3.5
strain-hardening
modification of a metal structure, by cold working, resulting in an increase in strength and hardness,
generally with loss of ductility
3.6
solution heat-treating
heating of an alloy at a suitable temperature for a sufficient time to allow one or more soluble
constituents to enter into solid solution, where they are retained in a supersaturated state after
quenching (rapid cooling)
1
© ISO 2023 – All rights reserved
---------------------- Page: 5 ----------------------
ISO/FDIS 2107:2023(E)
3.7
ageing
treatment of a metal aiming at a change in its properties by precipitation of intermetallic phases from
supersaturated solid solution
Note 1 to entry: Ageing can be a treatment at room temperature (natural ageing) or a thermal treatment (artificial
ageing).
3.8
annealing
thermal treatment to soften metal by reduction or removal of strain hardening resulting from cold
working and/or by coalescing precipitates from solid solution
3.9
heat treatable alloy
alloy which can be strengthened by a suitable thermal treatment
3.10
non-heat-treatable alloy
alloy which is strengthened by working and not by thermal treatment
3.11
stress-relieving
reduction of internal residual stresses by thermal or mechanical means
4 Basic temper designations
The temper designations are based on the sequences of basic treatments used to produce the
various tempers. Property limits (mechanical or physical) apply to individual alloy-temper-product
combinations.
Regional temper designations are provided in Annex A.
The temper designation follows the alloy designation; these are separated by a hyphen.
Basic temper designations consist of letters. If subdivisions of the basic tempers are required, these are
indicated by one or more digits following the letter of the basic temper. These digits relate to a specific
sequence of basic treatments, but only those treatments or operations recognized as significantly
influencing the product characteristics are indicated.
Should some other variation of the same sequence of basic operations be applied to the same alloy,
resulting in different characteristics, then additional digits are added to the designation.
Throughout this document, generalized examples of tempers are shown, as follows:
— “X” denotes an unspecified digit (e.g. H2X is generalized to indicate appropriate temper designations
in the series H21 to H29);
— “XX” denotes two unspecified digits (e.g. HXX4 is generalized to indicate appropriate temper
designations in the H114 to H194 series, the H224 to H294 series, and the H324 to H394 series);
— “_” denotes one or multiple unspecified digits (e.g. T_51 is generalized to indicate appropriate temper
designations such as T351, T651, T6151, T7351, T7651, etc.).
4.1 F — as fabricated
This designation applies to the products of shaping processes in which no special control over thermal
conditions or strain-hardening is employed. For wrought products, there are no mechanical property
limits specified.
2
© ISO 2023 – All rights reserved
---------------------- Page: 6 ----------------------
ISO/FDIS 2107:2023(E)
4.2 O — annealed
This designation applies to wrought products that are annealed to obtain the lowest strength temper,
and to cast products that are annealed to improve ductility and dimensional stability. The O may be
followed by a digit other than zero to indicate a product in the annealed condition having special
characteristics.
NOTE Products achieving the required annealed properties after hot forming processes can be designated
as O temper.
4.3 H — strain-hardened
This designation applies to products that have their strength increased by strain-hardening with or
without supplementary thermal treatments to produce some reduction in strength. The letter H is
always followed by at least two digits, the first indicating the specific combination of basic operations
and the second indicating the degree of strain hardening. A third digit indicates a variation of a two
digit temper and is used when the mechanical properties, or other characteristics, differ from those of
the twodigit H temper to which it is added.
4.4 W — solution heat-treated
This designation describes an unstable temper applicable only to alloys that spontaneously age at room
temperature after solution heat-treatment. This designation is specific only when the period of natural
ageing is indicated, e.g. W 1/2 hr.
4.5 T — precipitation hardened to produce stable tempers other than F, O or H
This designation applies to products that are precipitation hardened, with or without supplementary
strain hardening, to produce stable tempers. The T is always followed by one or more digits indicating
the specific sequence of treatments.
5 Subdivisions of O temper designations
A digit following the O, when used, indicates a product in the annealed condition having special
characteristics. As the O temper is not part of the strainhardened (H) series, variations of O temper
shall not apply to products that are strain-hardened after annealing and in which the effect of strain-
hardening is recognized in the mechanical properties or other characteristics.
5.1 O1 — high-temperature annealed to accentuate ultrasonic response and provide
dimensional stability
This designation applies to wrought products that are thermally treated at approximately the same
time and temperature required for solution heat-treatment and slow cooled to room temperature in
order to accentuate ultrasonic response and/or to provide dimensional stability. It is applicable to
products that are to be machined prior to solution heat-treatment by the user. Mechanical property
limits are not specified.
5.2 O3 — homogenized
This designation applies to continuously cast drawing stock or strip, which are subjected to a high
temperature soaking treatment to eliminate or reduce segregations, thus improving subsequent
formability and/or response to solution heat-treatment.
3
© ISO 2023 – All rights reserved
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ISO/FDIS 2107:2023(E)
6 Subdivisions of H temper designations
6.1 General
Subdivisions are made according to the basic operations described in Clause 4 and the final degree of
strain hardening as described in 6.2 to 6.5.
6.2 First digit after H
The first digit following the letter H indicates the specific combination of basic operations as follows:
a) H1X Strain-hardened only.
These designations apply to products that are strain-hardened to obtain the desired strength
without supplementary thermal treatment.
b) H2X Strain-hardened and partially annealed.
These designations apply to products that are strain-hardened more than the desired final amount,
and then reduced in strength to the desired level by partial annealing. For alloys that age-soften
at room temperature, the H2X tempers have the same minimum ultimate tensile strength as the
corresponding H3X tempers. For other alloys, the H2X tempers have the same minimum ultimate
tensile strength as the corresponding H1X tempers and slightly higher elongation.
c) H3X Strainhardened and stabilized.
These designations apply to products that are strain-hardened and whose mechanical properties
are stabilized e
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