SIST EN ISO 6892-2:2026

• Abstract:

  This document specifies a method of tensile testing of metallic materials at temperatures higher than room temperature.

• Status: Published
• Public Enquiry End Date: 20-Apr-2025
• Publication Date: 29-Sep-2026
• ICS: 77.040.10 - Mechanical testing of metals
• Technical Committee: PKG - Testing of metallic materials
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 19-Aug-2026
• Due Date: 24-Oct-2026
• Completion Date: 30-Sep-2026
• Ref Project: EN ISO 6892-2:2026 - Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature (ISO 6892-2:2026)

• Referred By: SIST EN 10217-2:2003 - Welded steel tubes for pressure purposes - Technical delivery conditions - Part 2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties
• Effective Date: 19-Aug-2026
• Referred By: SIST EN 1559-2:2000 - Founding - Technical conditions of delivery - Part 2: Additional requirements for steel castings
• Effective Date: 19-Aug-2026
• Referred By: SIST EN 4800-002:2011 - Aerospace series - Titanium and titanium alloys - Technical specification - Part 002: Bar and section
• Effective Date: 19-Aug-2026
• Referred By: SIST EN ISO 14604:2016 - Fine ceramics (advanced ceramics, advanced technical ceramics) - Methods of test for ceramic coatings - Determination of fracture strain (ISO 14604:2012)
• Effective Date: 19-Aug-2026
• Referred By: SIST EN 4700-006:2011 - Aerospace series - Steel and heat resisting alloys - Wrought products - Technical specification - Part 006: Pre-production and production forgings
• Effective Date: 19-Aug-2026
• Referred By: SIST EN 4800-003:2012 - Aerospace series - Titanium and titanium alloys - Technical specification - Part 003: Tube
• Effective Date: 19-Aug-2026
• Referred By: SIST EN 10253-4:2008 - Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements
• Effective Date: 19-Aug-2026
• Referred By: SIST EN 14917:2009+A1:2012 - Metal bellows expansion joints for pressure applications
• Effective Date: 19-Aug-2026
• Referred By: SIST EN 4700-001:2025 - Aerospace series - Steel and heat-resisting alloys - Wrought products - Technical specification - Part 001: Plates, sheets and strips
• Effective Date: 19-Aug-2026
• Referred By: SIST EN 13322-1:2024 - Transportable gas cylinders - Refillable welded steel gas cylinders - Design and construction - Part 1: Carbon steel
• Effective Date: 19-Aug-2026
• Referred By: SIST EN 10217-5:2003 - Welded steel tubes for pressure purposes - Technical delivery conditions - Part 5: Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties
• Effective Date: 19-Aug-2026
• Referred By: SIST EN 14532-2:2005 - Welding consumables - Test methods and quality requirements - Part 2: Supplementary methods and conformity assessment of consumables for steel, nickel and nickel alloys
• Effective Date: 19-Aug-2026
• Referred By: SIST EN 10088-5:2009 - Stainless steels - Part 5: Technical delivery conditions for bars, rods, wire, sections and bright products of corrosion resisting steels for construction purposes
• Effective Date: 19-Aug-2026
• Referred By: SIST EN 4800-008:2012 - Aerospace series - Titanium and titanium alloys - Technical specification - Part 008: Pre-production and production castings
• Effective Date: 19-Aug-2026
• Referred By: SIST EN 4700-004:2026 - Aerospace series - Steel and heat-resisting alloys - Wrought products - Technical specification - Part 004: Wires
• Effective Date: 19-Aug-2026

SIST EN ISO 6892-2:2026 is the Slovenian adoption of EN ISO 6892-2:2026 and ISO 6892-2:2026, published by SIST and CEN/ISO for tensile testing of metallic materials at temperatures higher than room temperature. It specifies the test method, apparatus, test conditions, reporting, and uncertainty treatment for laboratories that need elevated-temperature tensile results.

What does SIST EN ISO 6892-2:2026 specify?

SIST EN ISO 6892-2:2026 specifies a method of tensile testing for metallic materials at elevated temperature. The document covers how to prepare the test piece, heat it, load it, measure the relevant properties, and report the results.

The structure is straightforward: Clause 1 states the scope, Clause 2 lists normative references, Clauses 3 and 4 give terms and symbols, Clauses 5 to 13 cover the test principle, apparatus, conditions, calculations, report and uncertainty, and Clauses 14 and 15 point to figures and annexes.

Annex	What it covers
Annex A	Additional test piece geometries used for elevated-temperature testing, with gripping examples
Annex B	Measurement uncertainty, including the influence of temperature and strain rate

The document also relies on ISO 6892-1 for the room-temperature framework, so the elevated-temperature method stays aligned with the general tensile-testing practice in the ISO 6892 series.

What are the key requirements of SIST EN ISO 6892-2:2026?

SIST EN ISO 6892-2:2026 requires testing above room temperature and, specifically, above 35 °C. In practice, that means the laboratory must treat the heating stage as part of the test method, not as a side condition.

Specimen preparation follows ISO 6892-1

Clauses 6 to 8 direct the user to ISO 6892-1 for test piece requirements, original cross-sectional area, and marking of the original gauge length. This matters because the elevated-temperature test still uses room-temperature geometry and measurement conventions for the initial dimensions.

The apparatus has to be calibrated and suitable for hot testing

Clause 9 requires the force-measuring system to meet ISO 7500-1, class 1 or better. The extensometer shall meet ISO 9513, class 1 or better for proof strength, while class 2 may be used for other properties with larger extension.

Clause 9 also requires a heating device system that can bring the test piece to the specified temperature and keep it within the permitted temperature deviation. The temperature-measuring system needs a resolution of 1 °C or better, and the temperature on the parallel length has to be monitored so the laboratory can show that the soaking and test conditions were met.

Temperature control and soaking time are part of the method

Clause 10 requires the test piece to be heated to the specified temperature and held there for at least 10 min before loading. The loading may start only after the extensometer output has stabilized. For practice, this means the laboratory must verify thermal stability before taking mechanical data, especially because elevated-temperature results are sensitive to temperature gradients.

The force zero point and gauge length method must be controlled and documented

Clause 10 requires the force zero point to be set after the machine is assembled but before the test piece is placed in the grips. The document also gives several ways to establish the extensometer gauge length, including methods based on room temperature and methods based on test temperature.

The chosen gauge-length method shall be documented in the test report. That matters because different ways of handling thermal expansion can shift elongation results, even when the same material and temperature are used.

Method A and Method B define the loading rate

Clause 10 offers two ways to control the test rate. Method A uses strain-rate control with narrow tolerances and is intended to reduce variation and measurement uncertainty. Method B uses broader, traditional strain-rate ranges.

For Method A, the document gives different strain-rate ranges depending on whether the laboratory is determining yield or proof strength, lower yield strength, tensile strength, elongation after fracture, reduction of area, or extension at maximum force. If the machine cannot control strain rate directly, crosshead displacement control may be used.

For Method B, the document gives traditional strain-rate ranges for yield/proof strength and for tensile strength. If yield strength and tensile strength are both measured in one test, the transition between rates must be smooth and avoid overshoot. In practice, the chosen rate can change the result, so the method and rate need to match the purpose of the test.

Results are calculated and reported under defined conditions

Clause 11 sends the calculation of properties back to ISO 6892-1, and Clause 12 lists the minimum report content. The report has to identify the test piece, material, sampling location if known, control mode and rate, soaking time, test temperature, gauge-length method, deviations, results, and test date.

Clause 12 also gives rounding conventions for reported results. This matters when laboratories compare data from different machines or issue certificates and test reports.

Measurement uncertainty must include temperature and strain rate

Clause 13 and Annex B require uncertainty to be handled in line with ISO 6892-1, with attention to temperature and strain rate. Annex B explains that these two factors can affect all listed properties at elevated temperature, so uncertainty evaluation should not rely only on instrument calibration.

What terms does SIST EN ISO 6892-6:2026 define?

• Original gauge length (L0) - the distance between gauge marks on the test piece measured at room temperature before heating and before force is applied.
• Percentage elongation after fracture (A) - the permanent elongation of the gauge length after fracture, expressed as a percentage of the original gauge length.
• Extensometer gauge length - the length of the parallel portion used by the extensometer to measure extension.
• Extension - the increase in extensometer gauge length at a given moment during the test.
• Percentage reduction of area (Z) - the maximum reduction in cross-sectional area during the test, expressed as a percentage of the original area.
• Stress (R) - force divided by the original cross-sectional area of the test piece; the document uses engineering stress.
• Soaking time (ts) - the time needed to stabilize the test piece temperature before mechanical loading.
• Indicated temperature (Ti) and specified temperature (T) - the measured surface temperature on the parallel length and the target test temperature.

Who uses SIST EN ISO 6892-2:2026?

SIST EN ISO 6892-2:2026 is used by mechanical testing laboratories, metallurgical laboratories, and quality teams that need tensile properties at elevated temperature. It is also used by producers and purchasers of metallic materials when elevated-temperature performance has to be checked, compared, or specified.

In practice, the document supports test planning, machine setup, specimen preparation, verification of heating and measuring equipment, result calculation, and reporting. It is especially relevant when a product standard or internal specification asks for yield strength, proof strength, tensile strength, elongation, or reduction of area at elevated temperature.

What changed in SIST EN ISO 6892-2:2026 from the previous edition?

SIST EN ISO 6892-2:2026 supersedes EN ISO 6892-2:2018, and the third edition is described as technically revised. The foreword lists these main changes:

• revision of 9.3
• wording changes in 10.3
• wording changes in 10.4
• revision of Clause 12
• wording changes in Annex A
• updated references, especially to ISO 6892-1 and to specific clauses, figures and annexes
• editorial modifications

Which standards are used with SIST EN ISO 6892-2:2026?

• ISO 6892-1:2019 - supplies the room-temperature tensile-testing framework, including terms and definitions, test piece requirements, calculation of properties, uncertainty treatment, and many referenced figures and annexes.
• ISO 7500-1 - specifies calibration and verification of the force-measuring system of the testing machine.
• ISO 9513 - specifies calibration of extensometer systems used in uniaxial testing.
• ISO 80000-1 - is used for the rounding precision stated for reported results.

What does the SIST EN ISO 6892-2:2026 document contain?

The document contains the full tensile-testing procedure for elevated temperature, including the principle, apparatus, test conditions, calculations, reporting, and uncertainty treatment. It also includes Table 1 for additional symbols and Table 2 for permitted temperature deviations, plus Figure 1 to show how strain rates are applied through the test.

Annex A adds practical examples of test piece geometries and gripping methods for sheets, strips, flats, wires, bars, sections, and collar-type specimens. Annex B explains how to treat measurement uncertainty and shows how temperature and strain rate can change the stress-strain response.

The document also refers the user to ISO 6892-1 figures and annexes for the general tensile-testing framework, so the elevated-temperature method can be applied in a way that stays consistent with the main ISO 6892 series.

SLOVENSKI STANDARD
01-november-2026
Kovinski materiali - Natezni preskus - 2. del: Metoda preskušanja pri povišani
temperaturi (ISO 6892-2:2026)
Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature (ISO
6892-2:2026)
Metallische Werkstoffe - Zugversuch - Teil 2: Prüfverfahren bei erhöhter Temperatur
(ISO 6892-2:2026)
Matériaux métalliques - Essai de traction - Partie 2: Méthode d'essai à température
élevée (ISO 6892-2:2026)
Ta slovenski standard je istoveten z: EN ISO 6892-2:2026
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 6892-2
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2026
EUROPÄISCHE NORM
ICS 77.040.10 Supersedes EN ISO 6892-2:2018
English Version
Metallic materials - Tensile testing - Part 2: Method of test
at elevated temperature (ISO 6892-2:2026)
Matériaux métalliques - Essai de traction - Partie 2: Metallische Werkstoffe - Zugversuch - Teil 2:
Méthode d'essai à température élevée (ISO 6892- Prüfverfahren bei erhöhter Temperatur (ISO 6892-
2:2026) 2:2026)
This European Standard was approved by CEN on 23 June 2026.

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, Türkiye 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6892-2:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 6892-2:2026) 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 February 2027, and conflicting national standards
shall be withdrawn at the latest by February 2027.
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 6892-2:2018.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 6892-2:2026 has been approved by CEN as EN ISO 6892-2:2026 without any
modification.
International
Standard
ISO 6892-2
Third edition
Metallic materials — Tensile
2026-08
testing —
Part 2:
Method of test at elevated
temperature
Matériaux métalliques — Essai de traction —
Partie 2: Méthode d'essai à température élevée
Reference number
ISO 6892-2:2026(en) © ISO 2026

ISO 6892-2:2026(en)
© ISO 2026
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 6892-2:2026(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Principle . 2
6 Test piece . 3
7 Determination of original cross-sectional area (S ) . 3
o
8 Marking the original gauge length (L ) . 3
o
9 Apparatus . 3
10 Test conditions . 4
10.1 Setting the force zero point .4
10.2 Gripping of the test piece, fixing of the extensometer and heating of the test piece, not
necessarily in the following sequence .5
10.2.1 Method of gripping .5
10.2.2 Fixing of the extensometer and establishing the gauge length .5
10.2.3 Heating of the test piece .6
10.3 Testing rate based on strain rate control (Method A) .6
10.3.1 General .6
10.3.2 Strain rate for the determination of the upper yield strength (R ) or proof
eH
strength properties (R and, if required, R ) .6
p t
10.3.3 Strain rate for the determination of the lower yield strength (R ) and
eL
percentage yield point extension (A ), if required .6
e
10.3.4 Strain rate for the determination of the tensile strength (R ), percentage
m
elongation after fracture (A), percentage reduction area (Z), and, if required,
percentage total extension at the maximum force (A ), percentage plastic
gt
extension at maximum force (A ).7
g
10.4 Method of testing with expanded strain rate ranges (Method B) .7
10.4.1 General .7
10.4.2 Rate for the determination of yield strength or proof strength properties .7
10.4.3 Rate for the determination of tensile strength .7
10.5 Choice of the method and rates .8
10.6 Documentation of the chosen testing conditions .8
11 Determination or calculation of the properties . 8
12 Test report . 8
13 Measurement uncertainty . 9
14 Figures . 9
15 Annexes . 10
Annex A (informative) Additional information regarding test piece geometries used for testing
at elevated temperature .11
Annex B (informative) Measurement uncertainty . 17
Bibliography .20

iii
ISO 6892-2:2026(en)
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 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 164, Mechanical testing of metals, Subcommittee
SC 1, Uniaxial testing, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 459/SC 1, Test methods for steel (other than chemical analysis), in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 6892-2:2018), which has been technically
revised.
The main changes are as follows:
— revision of 9.3;
— wording in 10.3;
— wording in 10.4;
— revision of Clause 12;
— wording in Annex A;
— update of references, especially to ISO 6892-1, specific clauses, figures and annexes;
— editorial modifications.
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.

iv
ISO 6892-2:2026(en)
Introduction
In this document, two methods of testing speeds are described. The first, Method A, is based on strain rates
(including crosshead separation rate) with narrow tolerances (±20 %) and the second, Method B, is based
on conventional strain rate ranges and tolerances (strain rates from former editions). 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.
The influence of the testing speed on the mechanical properties, determined by the tensile test, is normally
greater at an elevated temperature than at room temperature.
Traditionally, mechanical properties determined by tensile tests at elevated temperatures have been
determined at a slower strain or stressing rate than at room temperature. This document recommends the
use of slow strain rates but, in addition, higher strain rates are permitted for particular applications, such as
comparison with room temperature properties at the same strain rate.

v
International Standard ISO 6892-2:2026(en)
Metallic materials — Tensile testing —
Part 2:
Method of test at elevated temperature
WARNING — This document calls for the use of either substances or procedures, or both, that can
be injurious to health if adequate safety measures are not taken. This document does not address
any health hazards, safety or environmental matters associated with its use. It is the responsibility
of the user of this document to establish appropriate health, safety and environmentally acceptable
practices.
1 Scope
This document specifies a method of tensile testing of metallic materials at temperatures higher than room
temperature.
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 6892-1:2019, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification 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 terms and definitions given in ISO 6892-1 and the following 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
original gauge length
L
o
distance between gauge length marks on the test piece measured at room temperature before heating of the
test piece and before application of force
3.2
percentage elongation after fracture
A
permanent elongation at room temperature of the gauge length after fracture (L − L )
u o
Note 1 to entry: A is expressed as a percentage of the original gauge length (L ) (3.1).
o
Note 2 to entry: For further details, see ISO 6892-1.

ISO 6892-2:2026(en)
3.3
extensometer gauge length
L
e
length within the parallel portion of the test piece used for the measurement of extension (3.4) by means of
an extensometer
3.4
extension
increase in the extensometer gauge length (L ) (3.3) at a given moment during the test
e
3.5
percentage extension
extension (3.4) expressed as a percentage of the extensometer gauge length (L ) (3.3)
e
3.6
percentage reduction of area
Z
maximum change in cross-sectional area which has occurred during the test (S − S )
o u
Note 1 to entry: Z is expressed as a percentage of the original cross-sectional area (S ), where S and S are calculated
o o u
from the dimensions at room temperature.
3.7
stress
R
force at any moment during the test divided by the original cross-sectional area (S ) of the test piece
o
Note 1 to entry: All stresses referred to in this document are engineering stresses, calculated using the cross-sectional
area of the test piece derived from dimensions measured at room temperature.
3.8
soaking time
t
s
time taken to stabilize the temperature of the test piece prior to mechanical loading
4 Symbols
ISO 6892-1 provides an extensive listing of symbols and their related designations.
The additional symbols used in this document are given in Table 1.
Table 1 — Symbols and designations
Symbol Designation Unit
T specified temperature or nominal temperature at which the test should be performed °C
T indicated temperature or measured temperature on the surface of the parallel length of the test piece °C
i
t soaking time min
s
5 Principle
The test involves straining a test piece by tensile force for the determination of one or more of the mechanical
properties defined in Clause 3.
The test shall be carried out at a temperature higher than 35 °C, which means at temperatures higher than
room temperature as specified in ISO 6892-1.

ISO 6892-2:2026(en)
6 Test piece
The requirements of the test pieces shall be in accordance with ISO 6892-1.
NOTE Additional examples of test pieces are given in Annex A.
7 Determination of original cross-sectional area (S )
o
The requirements concerning determination of the original cross-sectional area shall be in accordance with
ISO 6892-1.
NOTE S is calculated from measurements taken at room temperature.
o
8 Marking the original gauge length (L )
o
The requirements concerning the marking of the original gauge length shall be in accordance with
ISO 6892-1.
9 Apparatus
9.1 Force-measuring system.
The force-measuring system of the testing machine shall be calibrated in accordance with ISO 7500-1,
class 1, or better.
9.2 Extensometer.
For the determination of proof strength (plastic or total extension), the used extensometer shall be in
accordance with ISO 9513, class 1 or better, in the relevant range. For other properties (with higher
extension), an ISO 9513 class 2 extensometer in the relevant range may be used.
The extensometer gauge length shall be not less than 10 mm and shall correspond to the central portion of
the parallel length.
Any part of the extensometer projecting beyond the furnace shall be designed or protected from fluctuations
in air flow and room temperature, to have only a minimal effect on the readings. It is advisable to maintain
reasonable stability of the temperature and speed of the air surrounding the testing machine.
9.3 Heating device system.
9.3.1 The heating device system consists from several parts:
— heating device (e.g. furnace or oven);
— temperature controller;
— temperature measuring system.
The heating device system for the test piece shall be capable of heating the test piece to the specified
temperature, T.
9.3.2 Permitted deviations of temperature.
The indicated temperatures, T , are the temperatures measured on the surface of the parallel length of the
i
test piece with corrections applied for any known systematic errors (verified bias).
The permitted deviations between the specified temperature, T, and the indicated temperatures, T , and the
i
maximum permissible temperature difference within the entire parallel length of the test piece are given in

ISO 6892-2:2026(en)
Table 2. The laboratory shall verify that the permitted deviations are fulfilled at the end of the soaking time
to the start of the test. The measured temperature should be recorded during the complete test to identify
deviations.
For specified temperatures greater than 1 100 °C, the permitted deviations shall be defined by previous
agreement between the parties concerned.
Table 2 — Permitted deviations between T and T and maximum permissible temperature
i
differences along the test piece
Maximum permissible temperature
Specified temperature Permitted deviation between T and T
i
differences along the test piece
T
°C °C °C
T ≤ 600 ±3 3
600 < T ≤ 800 ±4 4
800 < T ≤ 1 000 ±5 5
1 000 < T ≤ 1 100 ±6 6
9.3.3 Measurement of temperature.
When the parallel length is less than 50 mm, one temperature sensor shall measure the temperature at
each end of the parallel length directly. When the parallel length is equal to or greater than 50 mm, a third
temperature sensor shall measure near the centre of the parallel length.
This number may
...