ASTM A1032-04

Standard Test Method for Hydrogen Embrittlement Resistance for Steel Wire Hard Drawn Used for Prestressing Concrete Pipe

SIGNIFICANCE AND USE
Hard-drawn steel wire as used in prestressing concrete pipe may be exposed to elemental hydrogen favorable to hydrogen induced embrittlement and cracking. Resistance to hydrogen embrittlement is necessary for prestressing wire to provide long-term performance to installed pipe.
The length of time that a stressed wire specimen resists failure while exposed to a heated solution of NH4SCN, is an indication of the specimen’resistance to hydrogen embrittlement.
SCOPE
1.1 This test method describes procedures to determine the hydrogen embrittlement (HE) resistance of hard drawn steel wire used for prestressing concrete pipe.
1.2 HE resistance is reported as time-to-failure of specimens tested in a laboratory.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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.

General Information

• Status: Historical
• Publication Date: 31-Aug-2004
• ICS: 77.140.15 - Steels for reinforcement of concrete
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.05 - Steel Reinforcement

Relations

• Replaced By: ASTM A1032-04(2010) - Standard Test Method for Hydrogen Embrittlement Resistance for Steel Wire Hard Drawn Used for Prestressing Concrete Pipe
• Effective Date: 01-May-2010
• Referred By: ASTM A648-18 - Standard Specification for Steel Wire, Hard-Drawn for Prestressed Concrete Pipe
• Effective Date: 01-Sep-2004

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:A1032–04
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 embrittlement is necessary for prestressing wire to
provide long-term performance to installed pipe.
1.1 This test method describes procedures to determine the
4.2 The length of time that a stressed wire specimen resists
hydrogen embrittlement (HE) resistance of hard drawn steel
failure while exposed to a heated solution of NH SCN, is an
wire used for prestressing concrete pipe. 4
indication of the specimen’s resistance to hydrogen embrittle-
1.2 HEresistanceisreportedastime-to-failureofspecimens
ment.
tested in a laboratory.
1.3 The values stated in SI units are to be regarded as the
5. Apparatus
standard. The values given in parentheses are for information
5.1 Test Cell—The test cell shall contain the test solution
only.
and the wire specimen and be constructed of material which is
1.4 This standard does not purport to address all of the
inert to NH SCN (as shown in Fig. 1). The test cell shall be
safety concerns, if any, associated with its use. It is the
cylindrical with an inside diameter sufficient to provide a
responsibility of the user of this standard to establish appro-
2 3 2
minimum of 5 mL of solution per 100 mm (2 in. per in.)of
priate safety and health practices and determine the applica-
wire specimen surface area in contact with the solution. The
bility of regulatory limitations prior to use.
test cell length shall allow the exposure of a minimum test
2. Referenced Documents sample length of 150 mm (6 in.) to the test solution. The test
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.
stressing 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
3. Summary of Test Method fracture of the sample shall be used.
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
hydrogen induced embrittlement and cracking. Resistance to
Analytical Reagents of the American Chemical Society where
such specifications are available. Other grades may be used,
This test method is under the jurisdiction of ASTM Committee A01 on Steel,
provided it is first ascertained that the reagent is of sufficiently
Standard Steel and Related Alloys and is the direct responsibility of Subcommittee
high purity to permit its use without lessening the accuracy of
A01.05 on Steel Reinforcement.
the determination.
Current edition approved Sept. 1, 2004. Published September 2004. DOI:
10.1520/A1032-04.
6.2 PurityofWater—Unless otherwise indicated, references
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
to water shall be understood to mean reagent water as defined
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
by Type 4 of Specification D1193.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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A1032–04
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 completed within 5 min of loading in
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