ISO/DIS 16573-2

Steel -- Measurement method for the evaluation of hydrogen embrittlement resistance of high strength steels

Acier -- Méthode de mesure pour l'évaluation de la résistance à la fragilisation par l'hydrogène des aciers à haute résistance

Standards Content (sample)

DRAFT INTERNATIONAL STANDARD
ISO/DIS 16573-2
ISO/TC 17/SC 7 Secretariat: AFNOR
Voting begins on: Voting terminates on:
2020-04-07 2020-06-30
Steel — Measurement method for the evaluation of
hydrogen embrittlement resistance of high strength
steels —
Part 2:
Slow stain rate test
ICS: 77.040.99
THIS DOCUMENT IS A DRAFT CIRCULATED
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ISO/DIS 16573-2:2020(E)
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ISO/DIS 16573-2:2020(E)
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ISO/DIS 16573-2:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

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

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

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

4 Principle ........................................................................................................................................................................................................................ 1

5 Specimen preparation .................................................................................................................................................................................... 2

5.1 Bar type specimen................................................................................................................................................................................ 2

5.2 Flat type specimen ............................................................................................................................................................................... 2

6 Hydrogen charging methods .................................................................................................................................................................... 3

7 Preparation of electroplating solution and electroplating condition ...........................................................3

8 Slow strain rate test ........................................................................................................................................................................................... 3

8.1 General ........................................................................................................................................................................................................... 3

8.2 Procedures .................................................................................................................................................................................................. 3

8.3 Presentation of the results ............................................................................................................................................................ 4

9 Post-test specimen treatment ................................................................................................................................................................. 6

10 Hydrogen thermal desorption................................................................................................................................................................ 6

11 Test Report .................................................................................................................................................................................................................. 6

Bibliography ................................................................................................................................................................................................................................ 8

© ISO 2020 – All rights reserved iii
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ISO/DIS 16573-2:2020(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

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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

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

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iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 7, Steel, Subcommittee SC 7 Methods of

testing (other than mechanical tests and chemical analysis).
The main changes compared to the previous edition are as follows:
A list of all parts in the ISO 16573 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 2020 – All rights reserved
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ISO/DIS 16573-2:2020(E)
Introduction

The mechanical properties of high strength steels, such as tensile strength, elongation and reduction

of area would be degraded by the effect of hydrogen, known as hydrogen embrittlement, and the

susceptibility of hydrogen embrittlement becomes greater with increasing the strength level of steels,

This International Standard suggests a standardized test method for the evaluation of hydrogen

embrittlement resistance of high strength steels, mainly ferritic base steels, using slow strain rate test.

© ISO 2020 – All rights reserved v
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DRAFT INTERNATIONAL STANDARD ISO/DIS 16573-2:2020(E)
Steel — Measurement method for the evaluation of
hydrogen embrittlement resistance of high strength
steels —
Part 2:
Slow stain rate test
1 Scope

This international standard method provides the evaluation method of the resistance to hydrogen

embrittlement (i.e., hydrogen delayed fracture) using slow strain rate test with hydrogen pre-charged

specimens. The amount of hydrogen absorbed in the specimens will be analysed quantitatively by

thermal desorption analysis such as gas chromatography, mass spectrometry and so on. Hydrogen pre-

charging methods are same as ISO 16573-1. This method addresses slow strain rate test to determine

the susceptibility of hydrogen embrittlement of high strength steel, and is mainly applicable for the

ferritic base steels. Testing methods for either smooth or notched specimens are also included.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 16573:2015, Steel — Measurement method for the evaluation of hydrogen embrittlement resistance of

high strength steels

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 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature

ISO 6892-2, Metallic materials — Tensile testing — Part 2: Method of test at elevated temperature

3 Terms and definitions
No terms and definitions are listed in this document.

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/
4 Principle

This method is to evaluate material resistance to hydrogen embrittlement by slow strain rate test. Figure

1 shows schematic sequences for the overall testing method including hydrogen pre-charging (such as

electrochemical method described in Part 1) Mechanical testing and Hydrogen analysis. Mechanical

properties such as, yield strength, tensile strength, fracture strength, elongation to fracture and

reduction of area are measured by applying tensile load at slow strain rate before and after hydrogen

charging. Hydrogen contents in the specimen can be measured by thermal desorption analysis, and

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ISO/DIS 16573-2:2020(E)

the relationship between the diffusible hydrogen content and the degradation of mechanical properties

can be obtained. Thermal desorption analysis of pre-charged but not deformed samples allows the

quantification of the initial diffusible hydrogen content. However, thermal desorption analysis of pre-

charged and deformed samples is only valid when the slow strain rate test is carried out

...