ASTM A1032-04(2010)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: A1032 − 04(Reapproved 2010)
Standard Test Method for
Hydrogen Embrittlement Resistance for Steel Wire Hard
Drawn Used for Prestressing Concrete Pipe
This standard is issued under the fixed designation A1032; 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.
1. Scope hydrogen induced embrittlement and cracking. Resistance to
hydrogen embrittlement is necessary for prestressing wire to
1.1 This test method describes procedures to determine the
provide long-term performance to installed pipe.
hydrogen embrittlement (HE) resistance of hard drawn steel
wire used for prestressing concrete pipe. 4.2 The length of time that a stressed wire specimen resists
failure while exposed to a heated solution of NH SCN, is an
1.2 HEresistanceisreportedastime-to-failureofspecimens
indication of the specimen’s resistance to hydrogen embrittle-
tested in a laboratory.
ment.
1.3 The values stated in SI units are to be regarded as
5. Apparatus
standard. The values given in parentheses are mathematical
conversions to inch-pound units that are provided for informa-
5.1 Test Cell—The test cell shall contain the test solution
tion only and are not considered standard.
and the wire specimen and be constructed of material which is
inert to NH SCN (as shown in Fig. 1). The test cell shall be
1.4 This standard does not purport to address all of the 4
cylindrical with an inside diameter sufficient to provide a
safety concerns, if any, associated with its use. It is the
2 3 2
minimum of 5 mL of solution per 100 mm (2 in. per in.)of
responsibility of the user of this standard to establish appro-
wire specimen surface area in contact with the solution. The
priate safety and health practices and determine the applica-
test cell length shall allow the exposure of a minimum test
bility of regulatory limitations prior to use.
sample length of 150 mm (6 in.) to the test solution. The test
2. Referenced Documents
cell shall be so designed that the wire specimen passes through
2.1 ASTM Standards: it and is sufficiently exposed outside the end of the cell as to
A648 Specification for Steel Wire, Hard-Drawn for Pre- allow application of a tensile force to the specimen.
stressed Concrete Pipe
5.2 Chronometer—A chronometer with a precision of at
D1193 Specification for Reagent Water
least 6 1 min. and capable of being stopped automatically on
fracture of the sample shall be used.
3. Summary of Test Method
5.3 Tensile Force Frame—A closed stiff frame, in either
3.1 Characterization of HE resistance of hard-drawn steel
horizontal or vertical orientation, shall be employed to position
wire is accomplished by determining the time-to-failure of a
the test cell such that a constant tensile force shall be applied
wire specimen under a maintained constant tensile force, while
to the test specimen and maintained. The tensile force shall be
immersed in a heated solution of ammonium thiocyanate
accomplished through use of a dead weight, or hydraulic
(NH SCN). The load, the solution temperature, and length of
loading system equipped with a force indicator.
time in the test are continuously monitored.
6. Reagents and Materials
4. Significance and Use
6.1 Purity of Reagents—Reagent grade chemicals shall be
4.1 Hard-drawn steel wire as used in prestressing concrete
used in all tests. Unless otherwise indicated, it is intended that
pipe may be exposed to elemental hydrogen favorable to
all reagents conform to the specifications of the Committee on
Analytical Reagents of the American Chemical Society where
This test method is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee such specifications are available. Other grades may be used,
A01.05 on Steel Reinforcement.
provided it is first ascertained that the reagent is of sufficiently
CurrenteditionapprovedMay1,2010.PublishedJuly2010.Originallyapproved
high purity to permit its use without lessening the accuracy of
in 2004. Last previous edition approved in 2004 as A1032 – 04. DOI: 10.1520/
the determination.
A1032-04R10.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2 Purity of Water—Unless otherwise indicated, references
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
to water shall be understood to mean reagent water as defined
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. by Type 4 of Specification D1193.
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A1032 − 04 (2010)
FIG. 1 Test Cell
6.3 Ammonium Thiocyanate—NH SCN solution shall be duration of the test. The tensile load application shall be
prepared by dissolving 250 g of NH SCN (98.5 % pure) per complet
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