ASTM F1459-93(1998)e1
(Test Method)Standard Test Method for Determination of the Susceptibility of Metallic Materials to Gaseous Hydrogen Embrittlement
Standard Test Method for Determination of the Susceptibility of Metallic Materials to Gaseous Hydrogen Embrittlement
SCOPE
1.1 This test method covers quantitative determination of the susceptibility of metallic materials to hydrogen embrittlement, when exposed to gaseous hydrogen, in any conditions.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety problems, 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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e1
Designation:F1459–93 (Reapproved 1998)
Standard Test Method for
Determination of the Susceptibility of Metallic Materials to
Gaseous Hydrogen Embrittlement
This standard is issued under the fixed designation F 1459; 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 (e) indicates an editorial change since the last revision or reapproval.
e NOTE—Editorial changes throughout this test method.
1. Scope form (liquid, gaseous, monoatomic, etc.) produced by corro-
sion, electrolysis, chemical process, etc. is present.
1.1 This test method covers quantitative determination of
3.2 The number corresponding to the P /P ratio will be
He H2
the susceptibility of metallic materials to hydrogen embrittle-
a relative indication of the severity of degradation of the
ment, when exposed to gaseous hydrogen, in any conditions.
mechanical properties to be expected.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
4. Apparatus
only.
4.1 The basic system consists of the following:
1.3 This standard does not purport to address all of the
4.1.1 Test Cell, as shown in Fig. 1, fabricated with type 316,
safety concerns, if any, associated with its use. It is the
⁄4-hard stainless steel.
responsibility of the user of this standard to establish appro-
4.1.2 The test cell is pressurized with hydrogen or helium
priate safety and health practices and determine the applica-
through a pneumatic system, illustrated in Fig. 2.
bility of regulatory limitations prior to use.
5. Gases
2. Summary of Test Method
5.1 Helium, purity 99.995 minimum, 6000-psig (41 600-
2.1 A thin disk of the metallic material to be tested is
kPa) cylinder.
introduced as a membrane into a test cell and submitted to
5.2 Hydrogen, purity 99.995 minimum, 6000 psig (41 400
helium pressure to burst. The fracture will be caused only by
kPa).
mechanical overload, and no physical-chemical secondary
action is involved because of the inert nature of helium. An
6. Specimen Preparation
identical disk of the same material is introduced in the same
6.1 Thespecimensforthetestcell,illustratedinFig.1,shall
test cell and submitted to hydrogen pressure to burst. Metallic
have a diameter of 58 mm (2.28 in.) and a thickness that varies
materials susceptible to hydrogen embrittlement will burst
between 0.25 and 1 mm (0.010 and 0.039 in.), most frequently
underapressurebelowtheheliumburstpressure.Materialsnot
0.75 mm (0.030 in.).
susceptible will fracture under a pressure identical to the
6.2 Three sets of two specimens with identical dimensions
helium pressure. The ratio between the helium burst pressure
and temper conditions shall be prepared for each test, and their
(P ) and the hydrogen burst pressure (P ), P /P , will
He H2 He H2
dimensions shall be measured and recorded.
indicate the susceptibility of the material to hydrogen em-
brittlement.
7. Procedure
7.1 Perform the burst test by helium pressure as follows:
3. Significance and Use
7.1.1 Insert one of the sets of two identical disks from the
3.1 This test method will provide a guide for the choice of
three sets into the Test Cell (Item 9 of Fig. 2) after checking
metallic materials for applications in which hydrogen in any
thattheNBRO-rings(27 3 3.2mm,70ADurometerhardness)
are in perfect condition. Then close the cell and tighten the
bolts.
This test method is under the jurisdiction of ASTM Committee F-7 on
7.1.2 Close Valves 3, 5, and 11; open Valves 4, 6, and 7 and
Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.04 on
apply a vacuum of 10-2 torr for 3 min to eliminate air and
Hydrogen Embrittlement.
Current edition approved Jan. 15, 1993. Published March 1993. residual test gases from the system. Close Valves 4, 6, and 7.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F1459
FIG. 1 Test Cell
7.1.5 Record the burst pressure as indicated by the slave
hand of Gage 8 and carefully open Valve 11 to bring the
pressure inside of the gage to atmospheric pressure. Then,
when this pressure is reached, open the test cell and set aside
the fractured disk for eventual further examination of the
fractured surfaces. Identify the helium burst pressure as P .
Hc
7.1.6 Repeat Steps 7.1.1-7.1.5 for the first of the two
identical disks from the remaining two sets. Calculate the
average of the three sets for P .
He
7.2 Perform the burst test by hydro
...
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