ASTM A1032-2015 Standard Test Method for Hydrogen Embrittlement Resistance for Steel Wire Hard-Drawn Used for Prestressed Concrete Pipe《预应力混凝土管用冷拉钢丝抗氢脆性的标准试验方法》.pdf

1、Designation: A1032 04 (Reapproved 2010)A1032 15Standard Test Method forHydrogen Embrittlement Resistance for Steel Wire HardDrawn Hard-Drawn Used for PrestressingPrestressedConcrete Pipe1This standard is issued under the fixed designation A1032; the number immediately following the designation indic

2、ates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope Scope*1.1 This test method describes procedure

3、s to determine the hydrogen embrittlement (HE) resistance of hard drawn hard-drawnsteel wire used for prestressingprestressed 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 standard. The value

4、s given in parentheses are mathematical conversionsto inch-pound units that are provided for information only and are not considered standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standar

5、d to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A648 Specification for Steel Wire, Hard-Drawn for Prestressed Concrete PipeD1193 Specification for Reagent Water3. Summary of Test M

6、ethod3.1 Characterization of HE resistance of hard-drawn steel wire is accomplished by determining the time-to-failure of a wirespecimen under a maintained constant tensile force, while immersed in a heated solution of ammonium thiocyanate (NH4SCN).The load, tensile force, the solution temperature,

7、and length of time in the test are continuously monitored.4. Significance and Use4.1 Hard-drawn steel wire as used in prestressingprestressed concrete pipe may be exposed to elemental hydrogen favorable tohydrogen induced embrittlement and cracking. Resistance to hydrogen embrittlement is necessary

8、for prestressing wire to providelong-term performance to installed pipe.4.2 The length of time that a stressed wire specimen resists failure while exposed to a heated solution of NH4SCN, is anindication of the specimens resistance to hydrogen embrittlement.5. Apparatus5.1 Test CellThe test cell shal

9、l contain the test solution and the wire specimen and be constructed of material which is inertto NH4SCN (as shown in Fig. 1). The test cell shall be cylindrical with an inside diameter sufficient to provide a minimum of 5mL of solution per 100 mm2 (2 in.3 per in.2) of wire specimen surface area in

10、contact with the solution. The test cell length shallallow the exposure of a minimum test samplespecimen length of 150 mm (6 in.) to the test solution. The test cell shall be sodesigned that the wire specimen passes through it and is sufficiently exposed outside the end of the cell as to allow appli

11、cation ofa tensile force to the specimen.1 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 A01.05on Steel Reinforcement.Current edition approved May 1, 2010May 1, 2015. Published July 2010M

12、ay 2015. Originally approved in 2004. Last previous edition approved in 20042010 asA1032 04.A1032 04 (2010). DOI: 10.1520/A1032-04R10.10.1520/A1032-15.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Stan

13、dardsvolume information, refer to the standards Document Summary page on the ASTM website.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. Becauseit may not be technically possible

14、 to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyrig

15、ht ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.2 ChronometerA chronometer with a precision of at least 6 1 min. and capable of being stopped automatically on fractureof the samplespecimen shall be used.5.3 Tensile Force FrameA closed stif

16、f frame, in either horizontal or vertical orientation, shall be employedused to positionthe test cell such that a constant tensile force shall be applied to the test specimen and maintained. The tensile force shall beaccomplishedapplied through use of a dead weight, or hydraulic loading system equip

17、ped with a force indicator.6. Reagents and Materials6.1 Purity of ReagentsReagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that allreagents conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society where suchs

18、pecifications are available. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purityto permit its use without lessening the accuracy of the determination.6.2 Purity of WaterUnless otherwise indicated, references to water shall be understood to mean

19、reagent water as defined byType 4 of Specification D1193.6.3 Ammonium ThiocyanateNH4SCN solution shall be prepared by dissolving 250 g of NH4SCN (98.5 % pure) per 1.0 L(0.52 lb of NH4SCN per 1.0 qt) of water.7. Sampling, Test Specimens, and Test Units7.1 Hard-Drawn Steel WireThe wire shall comply wi

20、th Specification A648.7.2 A test unit shall consist of 1500 mm (60 in.), or such length as specified by the testing laboratory, of wire from a coil ofwire. Specimens shall be identified with size, class, rod heat number, manufactured wire coil number, and name of wire and rodmanufacturer.7.2.1 The m

21、echanical properties shall have been determined in accordance with applicable sections of Specification A648 anda certified mill test report for the test unit shall be provided.7.3 Test SpecimenA test specimen shall be cut from the wire test unit, of such length that a minimum length of 150 mm (6in.

22、) will be exposed to the test solution, plus sufficient length to connect to a tension loading device. The test specimen shall beidentified as required in 7.2.7.3.1 The test specimen shall be cleaned by wiping with a soft cloth and degreased in acetone, or in trichlorethylene, then driedin air.7.3.2

23、 To prevent false negative results, the test specimen may be coated with an insulating material such as varnish, up to 25mm (1 in.) into the test cell at each end. The 25 mm length of coating at each end within the cell shall not be considered part ofthe length required in 7.3.8. Procedure8.1 Prepar

24、ationPlace the test specimen into the empty test cell and seal the ends of the cell. Place the test cell into the tensileforce frame.FIG. 1 Test CellA1032 1528.2 Load Tensile Force ApplicationApply a tensile force to the wire specimen until 70 % of the Specification A648 minimumtensile strength for

25、the wire diameter and class being tested is developed. Maintain the tensile force to within 6 2.0 % 62.0 %for the duration of the test. The tensile loadforce application shall be completed within 5 min of loading initiation.8.3 Fill Test CellUpon completion of tensile force application, fill the tes

26、t cell with NH4SCN test solution, preheated to atemperature of 50 6 1C (122 6 2F). Filling of the test cell shall be completed within 1 minute.8.4 Tensile LoadForce and TemperatureThe tensile force and the solution temperature shall be monitored and maintainedwithin the loadforce requirements of 8.2

27、 and the temperature requirements of 8.3, for the duration of the test.8.5 Time to FailureWith a full test cell, set the chronometer to zero and record time to failure to the nearest 1 min. Terminatetest after 100 h of exposure if failure has not occurred.9. Report9.1 Report ContentsA report of the

28、HE tests for HE test results from each specimen tested shall be made and shall include:9.1.1 Date of test and date of report.9.1.2 Identification of the test specimen.9.1.3 Wire diameter and class.9.1.4 Manufacturer of wire and manufacturer of rod.9.1.5 Wire coil number and rod heat number.9.1.6 Mec

29、hanical properties determined in accordance with Specification A648.9.1.7 Chemical composition in accordance with Specification A648.9.1.8 Number of hours-to-failure, or number of hours to test termination.9.1.9 Description of the actual test fabricationapparatus and testing procedures.10. Precision

30、 and Bias10.1 PrecisionNo statement is made on the precision of this test method since the test results indicate only whether there isconformance to given criteria and no generally accepted method for determining precision of this test method is currently available.General guidelines provided herein

31、 for the specimens, instrumentation, and procedures make the results intractable to calculationof meaningful values by statistical analysis for precision at this time.10.2 BiasSince there is no accepted reference material suitable for determining the bias in this test method, no statement onbias is

32、made.11. Keywords11.1 cracking; hydrogen embrittlement; prestressed concrete pipe; prestressing; hard-drawn steel wireSUMMARY OF CHANGESCommitteeA01 has identified the location of selected changes to this standard since the last issue (A1032 04(2010) that may impact the use of this standard. (Approv

33、ed May 1, 2015.)(1) Various editorial changes in the title, 1.1, 3.1, 4.1, 5.1, 5.2, 5.3, 8.2, 8.4, 9.1, and 9.1.9.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly ad

34、vised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, eithe

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36、f you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Indivi

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