ISO/TR 20491:2019
Fasteners — Fundamentals of hydrogen embrittlement in steel fasteners
This document presents the latest knowledge related to hydrogen embrittlement, translated into know-how in a manner that is complete yet simple, and directly applicable to steel fasteners.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 General description of hydrogen embrittlement
6 Hydrogen damage mechanism
7 Fracture morphology
8 Conditions at the tip of a crack
9 Conditions for hydrogen embrittlement failure
9.1 Root cause and triggers for hydrogen embrittlement failure
9.2 Material susceptibility
9.2.1 General
9.2.2 Defects and other conditions causing abnormal material susceptibility
9.2.3 Methodology for measuring HE threshold stress
9.3 Tensile stress
9.4 Atomic hydrogen
9.4.1 Sources of hydrogen
9.4.2 Internal hydrogen
9.4.3 Environmental hydrogen
10 Case-hardened fasteners
11 Hot dip galvanizing and thermal up-quenching
12 Stress relief prior to electroplating
13 Fasteners thread rolled after heat treatment
14 Hydrogen embrittlement test methods
15 Baking
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 General description of hydrogen embrittlement
6 Hydrogen damage mechanism
7 Fracture morphology
8 Conditions at the tip of a crack
9 Conditions for hydrogen embrittlement failure
9.1 Root cause and triggers for hydrogen embrittlement failure
9.2 Material susceptibility
9.2.1 General
9.2.2 Defects and other conditions causing abnormal material susceptibility
9.2.3 Methodology for measuring HE threshold stress
9.3 Tensile stress
9.4 Atomic hydrogen
9.4.1 Sources of hydrogen
9.4.2 Internal hydrogen
9.4.3 Environmental hydrogen
10 Case-hardened fasteners
11 Hot dip galvanizing and thermal up-quenching
12 Stress relief prior to electroplating
13 Fasteners thread rolled after heat treatment
14 Hydrogen embrittlement test methods
15 Baking
Bibliography