Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO 6892-1:2019)

This document specifies the method for tensile testing of metallic materials and defines the mechanical properties which can be determined at room temperature.
NOTE       Annex A contains further recommendations for computer controlled testing machines.

Metallische Werkstoffe - Zugversuch - Teil 1: Prüfverfahren bei Raumtemperatur (ISO 6892-1:2019)

Dieses Dokument legt das Verfahren für den Zugversuch an metallischen Werkstoffen fest und definiert die mechanischen Kennwerte, die bei Raumtemperatur bestimmt werden können.
ANMERKUNG   Anhang A enthält zusätzliche Empfehlungen für die Anwendung rechnergestützter Zugprüfmaschinen.

Matériaux métalliques - Essai de traction - Partie 1: Méthode d'essai à température ambiante (ISO 6892-1:2019)

Le présent document spécifie la méthode d'essai de traction des matériaux métalliques et définit les caractéristiques mécaniques qui peuvent être déterminées à température ambiante.
NOTE       L'Annexe A contient des recommandations supplémentaires pour les machines d'essai assistées par ordinateur.

Kovinski materiali - Natezni preskus - 1. del: Metoda preskušanja pri sobni temperaturi (ISO 6892-1:2019)

General Information

Status
Published
Publication Date
03-Dec-2019
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
04-Dec-2019
Completion Date
04-Dec-2019

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SLOVENSKI STANDARD
SIST EN ISO 6892-1:2020
01-april-2020
Nadomešča:
SIST EN ISO 6892-1:2017
Kovinski materiali - Natezni preskus - 1. del: Metoda preskušanja pri sobni
temperaturi (ISO 6892-1:2019)

Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO

6892-1:2019)

Metallische Werkstoffe - Zugversuch - Teil 1: Prüfverfahren bei Raumtemperatur (ISO

6892-1:2019)

Matériaux métalliques - Essai de traction - Partie 1: Méthode d'essai à température

ambiante (ISO 6892-1:2019)
Ta slovenski standard je istoveten z: EN ISO 6892-1:2019
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
SIST EN ISO 6892-1:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 6892-1:2020
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SIST EN ISO 6892-1:2020
EN ISO 6892-1
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2019
EUROPÄISCHE NORM
ICS 77.040.10 Supersedes EN ISO 6892-1:2016
English Version
Metallic materials - Tensile testing - Part 1: Method of test
at room temperature (ISO 6892-1:2019)

Matériaux métalliques - Essai de traction - Partie 1: Metallische Werkstoffe - Zugversuch - Teil 1:

Méthode d'essai à température ambiante (ISO 6892- Prüfverfahren bei Raumtemperatur (ISO 6892-1:2019)

1:2019)
This European Standard was approved by CEN on 12 November 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6892-1:2019 E

worldwide for CEN national Members.
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SIST EN ISO 6892-1:2020
EN ISO 6892-1:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 6892-1:2020
EN ISO 6892-1:2019 (E)
European foreword

This document (EN ISO 6892-1:2019) has been prepared by Technical Committee ISO/TC 164

"Mechanical testing of metals" in collaboration with Technical Committee CEN/TC 459/SC 1 “Test

methods for steel (other than chemical analysis)” the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by June 2020, and conflicting national standards shall be

withdrawn at the latest by June 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 6892-1:2016.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 6892-1:2019 has been approved by CEN as EN ISO 6892-1:2019 without any

modification.
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SIST EN ISO 6892-1:2020
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SIST EN ISO 6892-1:2020
INTERNATIONAL ISO
STANDARD 6892-1
Third edition
2019-11
Metallic materials — Tensile testing —
Part 1:
Method of test at room temperature
Matériaux métalliques — Essai de traction —
Partie 1: Méthode d'essai à température ambiante
Reference number
ISO 6892-1:2019(E)
ISO 2019
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SIST EN ISO 6892-1:2020
ISO 6892-1:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST EN ISO 6892-1:2020
ISO 6892-1:2019(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols .......................................................................................................................................................................................................................... 6

5 Principle ........................................................................................................................................................................................................................ 8

6 Test pieces ................................................................................................................................................................................................................... 8

6.1 Shape and dimensions ...................................................................................................................................................................... 8

6.1.1 General...................................................................................................................................................................................... 8

6.1.2 Machined test pieces .................................................................................................................................................... 9

6.1.3 Unmachined test pieces ............................................................................................................................................. 9

6.2 Types................................................................................................................................................................................................................ 9

6.3 Preparation of test pieces ...........................................................................................................................................................10

7 Determination of original cross-sectional area ................................................................................................................10

8 Original gauge length and extensometer gauge length .............................................................................................10

8.1 Choice of the original gauge length ....................................................................................................................................10

8.2 Marking the original gauge length ......................................................................................................................................10

8.3 Choice of the extensometer gauge length .....................................................................................................................11

9 Accuracy of testing apparatus ..............................................................................................................................................................11

10 Conditions of testing ......................................................................................................................................................................................11

10.1 Setting the force zero point .......................................................................................................................................................11

10.2 Method of gripping ...........................................................................................................................................................................11

10.3 Testing rates ...........................................................................................................................................................................................12

10.3.1 General information regarding testing rates ........................................................................................12

10.3.2 Testing rate based on strain rate (method A) ......................................................................................12

10.3.3 Testing rate based on stress rate (method B) ......................................................................................14

10.3.4 Report of the chosen testing conditions ...................................................................................................15

11 Determination of the upper yield strength ............................................................................................................................16

12 Determination of the lower yield strength .............................................................................................................................16

13 Determination of proof strength, plastic extension......................................................................................................16

14 Determination of proof strength, total extension ...........................................................................................................17

15 Method of verification of permanent set strength .........................................................................................................17

16 Determination of the percentage yield point extension ..........................................................................................17

17 Determination of the percentage plastic extension at maximum force ...................................................17

18 Determination of the percentage total extension at maximum force ........................................................18

19 Determination of the percentage total extension at fracture .............................................................................18

20 Determination of percentage elongation after fracture ...........................................................................................18

21 Determination of percentage reduction of area ...............................................................................................................19

22 Test report ................................................................................................................................................................................................................20

23 Measurement uncertainty .......................................................................................................................................................................20

23.1 General ........................................................................................................................................................................................................20

23.2 Test conditions .....................................................................................................................................................................................21

23.3 Test results...............................................................................................................................................................................................21

© ISO 2019 – All rights reserved iii
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SIST EN ISO 6892-1:2020
ISO 6892-1:2019(E)
Annex A (informative) Recommendations concerning the use of computer-controlled

tensile testing machines ............................................................................................................................................................................34

Annex B (normative) Types of test pieces to be used for thin products: sheets, strips, and

flats between 0,1 mm and 3 mm thick ........................................................................................................................................40

Annex C (normative) Types of test pieces to be used for wire, bars, and sections with a

diameter or thickness of less than 4 mm .................................................................................................................................43

Annex D (normative) Types of test pieces to be used for sheets and flats of thickness equal

to or greater than 3 mm and wire, bars, and sections of diameter or thickness equal

to or greater than 4 mm .............................................................................................................................................................................44

Annex E (normative) Types of test pieces to be used for tubes .............................................................................................48

Annex F (informative) Estimation of the crosshead separation rate in consideration of

the stiffness (or compliance) of the testing equipment ............................................................................................50

Annex G (normative) Determination of the modulus of elasticity of metallic materials using

a uniaxial tensile test ....................................................................................................................................................................................52

Annex H (informative) Measuring the percentage elongation after fracture if the specified

value is less than 5 % ....................................................................................................................................................................................61

Annex I (informative) Measurement of percentage elongation after fracture based

on subdivision of the original gauge length ..........................................................................................................................62

Annex J (informative) Determination of the percentage plastic elongation without necking,

A , for long products such as bars, wire, and rods ......................................................................................................64

Annex K (informative) Estimation of the uncertainty of measurement .......................................................................65

Annex L (informative) Precision of tensile testing — Results from interlaboratory programmes ..69

Bibliography .............................................................................................................................................................................................................................76

iv © ISO 2019 – All rights reserved
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SIST EN ISO 6892-1:2020
ISO 6892-1:2019(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 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.

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 documents 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).

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. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

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 164, Mechanical testing of metals,

Subcommittee SC 1, Uniaxial testing.

This third edition cancels and replaces the second edition (ISO 6892-1:2016), of which it constitutes a

minor revision. The changes compared to the previous edition are as follows:
— correction of the title of a standard in Clause 2;

— correction of the designation "coefficient of determination" ("coefficient of determination" instead

of "coefficient of correlation");
— correction of Formula (1);
— wording in 10.3.2.1;
— wording in the key of Figure 9;
— wording in Table B.2;
— wording in Table D.3;
— correction of the references.
A list of all parts in the ISO 6892 series can be found on the ISO website.

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.
© ISO 2019 – All rights reserved v
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SIST EN ISO 6892-1:2020
ISO 6892-1:2019(E)
Introduction

During discussions concerning the speed of testing in the preparation of ISO 6892, it was decided to

recommend the use of strain rate control in future revisions.

In this document, there are two methods of testing speeds available. The first, method A, is based on

strain rates (including crosshead separation rate) and the second, method B, is based on stress rates.

Method A is intended to minimize the variation of the test rates during the moment when strain rate

sensitive parameters are determined and to minimize the measurement uncertainty of the test results.

Therefore, and out of the fact that often the strain rate sensitivity of the materials is not known, the use

of method A is strongly recommended.

NOTE In what follows, the designations “force” and “stress” or “extension”, “percentage extension”, and

“strain”, respectively, are used on various occasions (as figure axis labels or in explanations for the determination

of different properties). However, for a general description or point on a curve, the designations “force” and

“stress” or “extension”, “percentage extension”, and “strain”, respectively, can be interchanged.

vi © ISO 2019 – All rights reserved
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SIST EN ISO 6892-1:2020
INTERNATIONAL STANDARD ISO 6892-1:2019(E)
Metallic materials — Tensile testing —
Part 1:
Method of test at room temperature
1 Scope

This document specifies the method for tensile testing of metallic materials and defines the mechanical

properties which can be determined at room temperature.

NOTE Annex A contains further recommendations for computer controlled testing machines.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:

Tension/compression testing machines — Verification and calibration of the force-measuring system

ISO 9513, Metallic materials — Calibration of extensometer systems used in uniaxial testing

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
gauge length

length of the parallel portion of the test piece on which elongation is measured at any moment during

the test
3.1.1
original gauge length

length between gauge length (3.1) marks on the test piece measured at room temperature before the test

3.1.2
final gauge length after fracture

length between gauge length (3.1) marks on the test piece measured after rupture, at room temperature,

the two pieces having been carefully fitted back together so that their axes lie in a straight line

© ISO 2019 – All rights reserved 1
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SIST EN ISO 6892-1:2020
ISO 6892-1:2019(E)
3.2
parallel length
length of the parallel reduced section of the test piece

Note 1 to entry: The concept of parallel length is replaced by the concept of distance between grips for

unmachined test pieces.
3.3
elongation
increase in the original gauge length (3.1.1) at any moment during the test
3.4
percentage elongation
elongation (3.3) expressed as a percentage of the original gauge length (3.1.1)
3.4.1
percentage permanent elongation

increase in the original gauge length (3.1.1) of a test piece after removal of a specified stress, expressed

as a percentage of the original gauge length (3.1.1)
3.4.2
percentage elongation after fracture

permanent elongation (3.3) of the gauge length after fracture (L − L ), expressed as a percentage of the

u o
original gauge length (3.1.1)
Note 1 to entry: For further information, see 8.1.
3.5
extensometer gauge length
initial gauge length of the extensometer used for measurement of extension (3.6)

Note 1 to entry: For the determination of several properties which are based (partly or complete) on extension, e.

g. R , A or A , the use of an extensometer is mandatory.
p e g
Note 2 to entry: For further information, see 8.3.
3.6
extension
increase in the extensometer gauge length (3.5), at any moment during the test
3.6.1
percentage extension
strain
extension (3.6) expressed as a percentage of the extensometer gauge length (3.5)
Note 1 to entry: e is commonly called engineering strain.
3.6.2
percentage permanent extension

increase in the extensometer gauge length (3.5), after removal of a specified stress (3.10) from the test

piece, expressed as a percentage of the extensometer gauge length
2 © ISO 2019 – All rights reserved
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SIST EN ISO 6892-1:2020
ISO 6892-1:2019(E)
3.6.3
percentage yield point extension

extension (3.6) between the start of yielding and the start of

uniform work-hardening, expressed as a percentage of the extensometer gauge length (3.5)

Note 1 to entry: See Figure 7.
3.6.4
percentage total extension at maximum force

total extension (3.6) (elastic extension plus plastic extension) at maximum force, expressed as a

percentage of the extensometer gauge length (3.5)
Note 1 to entry: See Figure 1.
3.6.5
percentage plastic extension at maximum force

plastic extension (3.6) at maximum force, expressed as a percentage of the extensometer gauge length (3.5)

Note 1 to entry: See Figure 1.
3.6.6
percentage total extension at fracture

total extension (3.6) (elastic extension plus plastic extension) at the moment of fracture, expressed as a

percentage of the extensometer gauge length (3.5)
Note 1 to entry: See Figure 1.
3.7
testing rate
rate (resp. rates) used during the test
3.7.1
strain rate

increase of strain, measured with an extensometer, in extensometer gauge length (3.5), per time

3.7.2
estimated strain rate over the parallel length

value of the increase of strain over the parallel length (3.2) of the test piece per time based on the

crosshead separation rate (3.7.3) and the parallel length of the test piece
3.7.3
crosshead separation rate
displacement of the crossheads per time
3.7.4
stress rate
increase of stress (3.10) per time

Note 1 to entry: Stress rate is only used in the elastic part of the test (method B) (see also 10.3.3).

© ISO 2019 – All rights reserved 3
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SIST EN ISO 6892-1:2020
ISO 6892-1:2019(E)
3.8
percentage reduction of area

maximum change in cross-sectional area which has occurred during the test (S − S ), expressed as a

o u
percentage of the original cross-sectional area, S :
SS−
Z = ⋅100
3.9 Maximum force
3.9.1
maximum force

highest force that the test piece withstands during

the test
3.9.2
maximum force

highest force that the test piece withstands during the

test after the beginning of work-hardening

Note 1 to entry: For materials which display discontinuous yielding, but where no work-hardening can be

established, F is not defined in this document [see footnote to Figure 8 c)].
Note 2 to entry: See Figure 8 a) and b).
3.10
stress

at any moment during the test, force divided by the original cross-sectional area, S , of the test piece

Note 1 to entry: All references to stress in this document are to engineering stress.

3.10.1
tensile strength
stress (3.10) corresponding to the maximum force (3.9.2)
3.10.2
yield strength

when the metallic material exhibits a yield phenomenon, stress (3.10) corresponding to the point

reached during the test at which plastic deformation occurs without any increase in the force

3.10.2.1
upper yield strength
maximum value of stress (3.10) prior to the first decrease in force
Note 1 to entry: See Figure 2.
3.10.2.2
lower yield strength

lowest value of stress (3.10) during plastic yielding, ignoring any initial transient effects

Note 1 to entry: See Figure 2.
4 © ISO 2019 – All rights reserved
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SIST EN ISO 6892-1:2020
ISO 6892-1:2019(E)
3.10.3
proof strength, plastic extension

stress (3.10) at which the plastic extension (3.6) is equal to a specified percentage of the extensometer

gauge length (3.5)

Note 1 to entry: Adapted from ISO/TR 25679:2005, “proof strength, non-proportional extension”.

Note 2 to entry: A suffix is added to the subscript to indicate the prescribed percentage, e.g. R .

p0,2
Note 3 to entry: See Figure 3.
3.10.4
proof strength, total extension

stress (3.10) at which total extension (3.6) (elastic extension plus plastic extension) is equal to a specified

percentage of the extensometer gauge length (3.5)

Note 1 to entry: A suffix is added to the subscript to indicate the prescribed percentage, e.g. R .

t0,5
Note 2 to entry: See Figure 4.
3.10.5
permanent set strength
stress (3.10) at which, after removal of force, a specified permanent elongati
...

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