ASTM F1624-12
(Test Method)Standard Test Method for Measurement of Hydrogen Embrittlement Threshold in Steel by the Incremental Step Loading Technique
Standard Test Method for Measurement of Hydrogen Embrittlement Threshold in Steel by the Incremental Step Loading Technique
SIGNIFICANCE AND USE
5.1 This test method is used for research, design, service evaluation, manufacturing control, and development. This test method quantitatively measures stress parameters that are used in a design or failure analysis that takes into account the effects of environmental exposure including that which occurs during processing, such as plating (8) (ASTM STP 962).
5.2 For plating processes, the value of σ th-IHE is used to specify quantitatively the maximum operating stress for a given structure or product.
5.3 For quality control purposes, an accelerated test is devised that uses a specified loading rate, which is equal to or lower than the loading rate necessary to determine the threshold stress (see 8.1).
5.4 For fasteners, the value of σth-IHE is used to specify quantitatively the maximum stress during installation and in service to avoid premature failure caused by residual hydrogen in the steel as a result of processing.
5.5 For fasteners, the value of σth-EHE is used to specify quantitatively the maximum stress during installation and in service to avoid failure from hydrogen absorbed during exposure to a specific environment.
5.6 To measure the relative susceptibility of steels to hydrogen pickup from various fabrication processes, a single, selected, discriminating rate is used to rank the resistance of various materials to hydrogen embrittlement.
5.7 Annex A1 describes the application of this standard test method to hydrogen embrittlement testing of fasteners.
SCOPE
1.1 This test method establishes a procedure to measure the susceptibility of steel to a time-delayed failure such as that caused by hydrogen. It does so by measuring the threshold for the onset of subcritical crack growth using standard fracture mechanics specimens, irregular-shaped specimens such as notched round bars, or actual product such as fasteners (2) (threaded or unthreaded) springs or components as identified in SAE J78, J81, and J1237.
1.2 This test method is used to evaluate quantitatively:
1.2.1 The relative susceptibility of steels of different composition or a steel with different heat treatments;
1.2.2 The effect of residual hydrogen in the steel as a result of processing, such as melting, thermal mechanical working, surface treatments, coatings, and electroplating;
1.2.3 The effect of hydrogen introduced into the steel caused by external environmental sources of hydrogen, such as fluids and cleaners maintenance chemicals, petrochemical products, and galvanic coupling in an aqueous environment.
1.3 The test is performed either in air, to measure the effect if residual hydrogen is in the steel because of the processing (IHE), or in a controlled environment, to measure the effect of hydrogen introduced into the steel as a result of the external sources of hydrogen (EHE) as detailed in ASTM STP 543.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.Note 1—The values stated in metric units may not be exact equivalents. Conversion of the inch-pound units by appropriate conversion factors is required to obtain exact equivalence.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: F1624 − 12
Standard Test Method for
Measurement of Hydrogen Embrittlement Threshold in Steel
1
by the Incremental Step Loading Technique
This standard is issued under the fixed designation F1624; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Hydrogen embrittlement is caused by the introduction of hydrogen into steel that can initiate
2
fracture as a result of residual stress or in service when external stress is applied (1). The hydrogen
can be generated during cleaning or plating processes or the exposure of cathodically protected steel
parts to a service environment including fluids, cleaning treatments, or maintenance chemicals that
maycontactthesurfaceofsteelcomponents.Thismethodcanbeusedtorapidlydeterminetheeffects
ofresidualhydrogeninapartcausedbyprocessingorquantifytherelativesusceptibilityofamaterial
under a fixed set of hydrogen-charging conditions.
The combined residual and applied stress above which time-delayed fracture will occur (finite life)
orbelowwhichfracturewillneveroccur(infinitelife)iscalledthethresholdstressorthresholdstress
intensity (K) for precracked specimens. Historically, sustained load time-to-failure tests have been
conductedonnotchedbarstodeterminethethresholdstressfortheonsetofhydrogenstresscracking.
This technique may require 12 to 14 specimens and several high-load capacity machines. For
precrackedspecimens,therun-outtimecanbeaslongasfourtofiveyearsperU.S.Navyrequirements
for low-strength steels at 33 to 35 HRC. In Test Method E1681, more than 10000 h (> one year) are
specified for low-strength steel (< 175 ksi) and 5000 h for high-strength steel (> 175 ksi).
This standard provides an accelerated method to measure the threshold stress or threshold stress
intensityasdefinedinTestMethodE1681fortheonsetofhydrogenstresscrackinginsteelwithinone
weekononlyonemachine.Thespecificapplicationofthisstandardtohydrogenembrittlementtesting
of fasteners is described in Annex A1.
1. Scope 1.2.2 The effect of residual hydrogen in the steel as a result
of processing, such as melting, thermal mechanical working,
1.1 This test method establishes a procedure to measure the
surface treatments, coatings, and electroplating;
susceptibility of steel to a time-delayed failure such as that
1.2.3 Theeffectofhydrogenintroducedintothesteelcaused
caused by hydrogen. It does so by measuring the threshold for
by external environmental sources of hydrogen, such as fluids
the onset of subcritical crack growth using standard fracture
mechanics specimens, irregular-shaped specimens such as and cleaners maintenance chemicals, petrochemical products,
notched round bars, or actual product such as fasteners (2) and galvanic coupling in an aqueous environment.
(threadedorunthreaded)springsorcomponentsasidentifiedin
1.3 The test is performed either in air, to measure the effect
SAE J78, J81, and J1237.
if residual hydrogen is in the steel because of the processing
1.2 This test method is used to evaluate quantitatively:
(IHE), or in a controlled environment, to measure the effect of
1.2.1 The relative susceptibility of steels of different com-
hydrogen introduced into the steel as a result of the external
position or a steel with different heat treatments;
sources of hydrogen (EHE) as detailed in ASTM STP 543.
1.4 Thevaluesstatedininch-poundunitsaretoberegarded
1
This test method is under the jurisdiction of ASTM Committee F07 on
as standard. The values given in parentheses are mathematical
Aerospace andAircraft and is the direct responsibility of Subcommittee F07.04 on
conversions to SI units that are provided for information only
Hydrogen Embrittlement.
and are not considered standard.
Current edition approved Aug. 1, 2012. Published November 2012. Originally
approved in 1995. Last previous edition approved in 2009 as F1624–09. DOI:
NOTE1—Thevaluesstatedinmetricunitsmaynotbeexactequivalents.
10.1520/F1624-12.
2
Conversion of the inch-pound units by appropriate conversion factors is
Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof
this standard. required to obtain exact equivalence.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F1624 − 12
1.5 This standard does not purport to address all of the B18.18.4MInspection and Quality Assurance for Fasteners
6
safety concerns, if any, associated with its use. It is the for Highly Specialized Engineering Applications, 1987
responsibility of the user of this standard to establish appro-
2.4 Related Publica
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F1624 − 09 F1624 − 12
Standard Test Method for
Measurement of Hydrogen Embrittlement Threshold in Steel
1
by the Incremental Step Loading Technique
This standard is issued under the fixed designation F1624; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Hydrogen embrittlement is caused by the introduction of hydrogen into steel that can initiate
2
fracture as a result of residual stress or in service when external stress is applied (1). The hydrogen
can be generated during cleaning or plating processes or the exposure of cathodically protected steel
parts to a service environment including fluids, cleaning treatments, or maintenance chemicals that
may contact the surface of steel components. This method can be used to rapidly determine the effects
of residual hydrogen in a part caused by processing or quantify the relative susceptibility of a material
under a fixed set of hydrogen-charging conditions.
The combined residual and applied stress above which time-delayed fracture will occur (finite life)
or below which fracture will never occur (infinite life) is called the threshold stress or threshold stress
intensity (K) for precracked specimens. Historically, sustained load time-to-failure tests have been
conducted on notched bars to determine the threshold stress for the onset of hydrogen stress cracking.
This technique may require 12 to 14 specimens and several high-load capacity machines. For
precracked specimens, the run-out time can be as long as four to five years per U.S. Navy requirements
for low-strength steels at 33 to 35 HRC. In Test Method E1681, more than 10 000 h (> one year) are
specified for low-strength steel (< 175 ksi) and 5000 h for high-strength steel (> 175 ksi).
This standard provides an accelerated method to measure the threshold stress or threshold stress
intensity as defined in Test Method E1681 for the onset of hydrogen stress cracking in steel within one
week on only one machine. The specific application of this standard to hydrogen embrittlement testing
of fasteners is described in Annex A1.
1. Scope
1.1 This test method establishes a procedure to measure the susceptibility of steel to a time-delayed failure such as that caused
by hydrogen. It does so by measuring the threshold for the onset of subcritical crack growth using standard fracture mechanics
specimens, irregular-shaped specimens such as notched round bars, or actual product such as fasteners (2) (threaded or unthreaded)
springs or components as identified in SAE J78, J81, and J1237.
1.2 This test method is used to evaluate quantitatively:
1.2.1 The relative susceptibility of steels of different composition or a steel with different heat treatments;
1.2.2 The effect of residual hydrogen in the steel as a result of processing, such as melting, thermal mechanical working, surface
treatments, coatings, and electroplating;
1.2.3 The effect of hydrogen introduced into the steel caused by external environmental sources of hydrogen, such as fluids and
cleaners maintenance chemicals, petrochemical products, and galvanic coupling in an aqueous environment.
1.3 The test is performed either in air, to measure the effect if residual hydrogen is in the steel because of the processing (IHE),
or in a controlled environment, to measure the effect of hydrogen introduced into the steel as a result of the external sources of
hydrogen (EHE) as detailed in ASTM STP 543.
1
This test method is under the jurisdiction of ASTM Committee F07 on Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.04 on Hydrogen
Embrittlement.
Current edition approved Dec. 1, 2009Aug. 1, 2012. Published February 2010 November 2012. Originally approved in 1995. Last previous edition approved in 20062009
as F1624 – 06.F1624 – 09. DOI: 10.1520/F1624-09.10.1520/F1624-12.
2
The boldface numbers in parentheses refer to the list of references at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F1624 − 12
1.4 The values stated in acceptable inch-pound units shall are to be regarded as the standard. The values stated in metric units
may not be exact equivalents. Conversion of the inch-pound units by a
...
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