1、Designation: A821/A821M 10Standard Specification forSteel Wire, Hard-Drawn for Prestressed Concrete Tanks1This standard is issued under the fixed designation A821/A821M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of l
2、ast 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*1.1 This specification covers uncoated, high-strength, hard-drawn steel wire for use in the construction of prestressedcon
3、crete tanks and similar structures. In application, the wire iscontinuously wrapped on the structure maintaining tension bya device using a wire drawing die, or mechanical tensioningsystem without re-drawing.1.2 This specification is applicable only to the condition ofthe wire as delivered to the pu
4、rchaser. It is not applicable to theproperties or condition of the wire after application.1.2.1 Type A wire is to be tensioned by drawing through awire drawing die or by a mechanical system without re-drawing.1.2.2 Type B wire is drawn to finished size by the manu-facturer for tensioning by a mechan
5、ical system without re-drawing.NOTE 1Type A wire, when tensioned by drawing through a die, maynot function properly if the purchaser does not ensure that duringapplication the surface of the wire is free of rust and foreign materials thatcan be detrimental to good wire drawing practice. Further, the
6、 purchasershould ensure that proper wire drawing techniques are followed, includingadequate lubrication, cooling, and proper die mechanics.1.3 This specification is applicable for orders in eitherinch-pounds units (as Specification A821) or in SI units (asSpecification A821M).1.4 The values stated i
7、n either inch-pound units or SI unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem may not be exact equivalents; therefore, each systemshall be used independently of the other. Combining valuesfrom the two systems may r
8、esult in non-conformance with thestandard.2. Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA510 Specification for General Requirements for WireRods and Coarse Round Wire, Carbon SteelA700 Practices for Packaging, Marking, and Loading
9、 Meth-ods for Steel Products for ShipmentA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3. Ordering Information3.1 It shall be the responsibility of the purchaser
10、to specifyall requirements that are necessary for material ordered to thisspecification. Such requirements shall include, but are notlimited to, the following:3.1.1 Quantity (weight) mass,3.1.2 Name of material (hard-drawn steel wire for pre-stressed concrete tanks, Type A wire or Type B wire),3.1.3
11、 Wire diameter,3.1.4 Certification, if required (12.1),3.1.5 Marking (13.1),3.1.6 Packaging (14.1), and3.1.7 ASTM designation and year of issue.3.2 Pre-lubrication, if required, shall be specified by thepurchaser.4. Manufacture4.1 The steel shall be made by the electric-arc furnace,basic-oxygen, or
12、open-hearth process.4.2 The steel should be of such quality, that the finished wireshall be free of detrimental pipe and undue segregation.4.3 The wire shall be cold-drawn to produce the prescribedmechanical properties.4.4 There shall be no welds or joints in the finished wire.Welds or joints made d
13、uring drawing to enable continuity ofoperations shall be removed.5. Chemical Composition Requirements5.1 The steel shall conform to the chemical compositionrequirements specified in Table 1.5.2 Heat AnalysisEach heat of steel shall be analyzed bythe manufacturer. This analysis shall be made from a t
14、estspecimen preferably taken during the pouring of the heat; whenrequested, this analysis shall be reported to the purchaser.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.05 on Steel
15、 Reinforcement.Current edition approved Nov. 1, 2010. Published December 2010. Originallyapproved in 1984. Last previous edition approved in 2005 as A821/A821M 05.DOI: 10.1520/A0821_A0821M-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at ser
16、viceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, Un
17、ited States.5.3 Product AnalysisThe purchaser shall have the right tomake an analysis from the finished wire representing each heatof steel. The chemical composition thus obtained shall conformto the product analysis requirements specified in SpecificationA510 for the elements required or restricted
18、.5.4 Test Methods, Practices, and TerminologyA751 shall beused for chemical analysis.6. Mechanical Property Requirements6.1 Tensile Strength TestType A wire as represented bythe test specimens shall conform to the requirements prescribedin Table 2. Type B wire as represented by the test specimenssha
19、ll conform to the requirements in Table 3.6.2 Wrap TestThe wire as represented by the wrap-testspecimens shall conform to the requirements prescribed inTable 4.6.3 The tensile strength test and wrap test shall be made inaccordance with Test Methods and Definitions A370, AnnexA4.6.4 Torsion TestTorsi
20、on requirements shall conform tothose prescribed in Table 5 for Type A wire and Type B wire.The test shall be completed within 15 to 30 seconds, and lengthchange shall be unrestrained.7. Permissible Variations in Diameter7.1 The diameter of the wire shall not vary from thatspecified by more than the
21、 tolerances shown in Table 6.7.2 For purposes of determining conformance with thisspecification, all specified limits are absolute as defined inPractice E29.8. Workmanship, Finish, and Appearance8.1 The surface of the wire, as received, shall be smooth andgenerally free of rust. A light oxidation fi
22、lm that does not causepitting of the wire surface visible to a person with normal orcorrected vision after wiping or light cleaning, shall not because for rejection. Type A wire shall be suitable for furtherreasonable reduction of cross-sectional area during application.Coils of wire with visible pi
23、tting shall be rejected.8.2 The wire shall not have piping, cross checking, tornsurfaces, chatter marks, splits, die marks, scratches, pits, orseams that are detrimental to its application.8.3 The wire shall not be kinked, improperly cast, or showa wavy condition.8.4 Each coil shall be one continuou
24、s length of wire,properly coiled.8.5 The wire shall not be oiled or greased.9. Sampling and Number of Tests9.1 Alot shall consist of all the coils of wire of the same sizeand class and offered for inspection at one time.9.2 One test specimen shall be taken for each ten coils, orfraction thereof, in
25、a lot. Each heat in a given lot shall be tested.9.3 Test specimens cut from either end of the coil arepermitted.9.4 Any test specimen showing the presence of an obviousdefect, shall be discarded and another specimen substituted.9.5 Test specimens shall be tested for tensile strength (6.1),wrap test
26、(6.2), and torsion test (6.4).10. Inspection10.1 Unless otherwise specified in the purchase order orcontract, the manufacturer shall be responsible for the perfor-mance of all inspection and test requirements specified in thisspecification. Except as otherwise specified in the purchaseorder or contr
27、act, the manufacturer shall be permitted to useones own or any other suitable facilities for the performanceof the inspection and test requirements unless disapproved bythe purchaser at the time the order is placed. The purchasershall have the right to perform any of the inspections and testsTABLE 1
28、 Chemical Composition RequirementsElement Composition, %Carbon 0.50 to 0.85Manganese 0.60 to 1.10Phosphorus, max 0.040Sulfur, max 0.050Silicon 0.10 to 0.35TABLE 2 Tensile Requirements (Type A)ADiameter, in. mmTensile Strength, ksi MPaMin Max0.162 4.1 218 1500 258 17800.177 4.5 213 1470 253 17400.192
29、 4.9 210 1450 250 17200.207 5.3 208 1430 248 17100.225 5.7 204 1410 244 16800.235 6.0 202 1390 242 1670ATensile strength values for intermediate diameters may be interpolated.TABLE 3 Tensile Requirements (Type B)Decimal SizeMinimum TensileStrengthMaximum TensileStrengthin. mm ksi MPa ksi MPa0.162 4.
30、1 231 1590 262 18100.192 4.9 222 1530 252 17400.250 6.4 211 1450 241 1450TABLE 4 Wrap-Test RequirementsDiameter, in. mm Mandrel Size0.162 to 0.250 4.1 to 6.4, incl 2XAAX is specified wire diameter.TABLE 5 Torsion RequirementsDiameter, in. mm Number of Turns in 8 in. 203 mm0.162 4.1 90.177 4.5 80.192
31、 4.9 70.207 5.3 60.225 5.7 50.235 6.0 50.250 6.4 4TABLE 6 Permissible Variations in Wire DiameterDiameter, in. mmPermissibleVariations,6in. mmPermissibleOut-of-Round,in. mm0.162 to 0.250 4.1 to 6.4 0.002 0.05 0.002 0.05A821/A821M 102set forth in this specification when such inspections and testsare
32、deemed necessary to assure that the material conforms toprescribed requirements.11. Rejection and Rehearing11.1 Material that fails to conform to the requirements ofthis specification shall be subject to rejection. Rejections shallbe reported to the manufacturer promptly and in writing. Incase of di
33、ssatisfaction with the results of the test, the manu-facturer shall have the right to make claim for a rehearing.11.2 The material shall be adequately protected and cor-rectly identified so that the manufacturer can make a properinvestigation.12. Certification12.1 When specified in the purchase orde
34、r or contract, amanufacturers certification shall be furnished to the purchaserthat the material was manufactured, tested, and inspected inaccordance with this specification and has been found to meetthe requirements. The certification shall include the specifica-tion number, year/date of issue and
35、revision letter, if any.12.2 A material test report, certificate of inspection, orsimilar document printed from or used in electronic form froman electronic data interchange (EDI) transmission shall beregarded as having the same validity as a counterpart printed inthe certifiers facility. The conten
36、t of the EDI transmitteddocument must meet the requirements of the invoked ASTMstandard(s) and conform to any existing EDI agreement be-tween the purchaser and the supplier. Notwithstanding theabsence of a signature, the organization submitting the EDItransmission is responsible for the content of t
37、he report.NOTE 2The industry definition as invoked here is: EDI is thecomputer-to-computer exchange of business information in a standardformat such as ANSI ASC X12.13. Marking13.1 The type of wire, size of the wire, purchase ordernumber, ASTM specification designation A821/A821M, heatnumber, and na
38、me of the manufacturer shall be marked on aweather-resistant tag securely attached to each coil of wire.14. Packaging14.1 When specified in the purchase order or contract,packaging shall be in accordance with the procedures inPractices A700.15. Keywords15.1 prestressed concrete tanks; steel wireSUMM
39、ARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A821/A821M 05) that may impact the use of this standard. (Approved Nov. 1, 2010.)(1) Revised the title.(2) Corrected errors, made editorial improvements, and re-positioned the units thro
40、ughout the specification.(3) Revised Sections 3 and 6.(4) Re-located former Note 1 in Table 6 to a provision in 7.2.(5) Corrected the largest wire size in Table 4 and Table 6.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentio
41、nedin this standard. Users of this standard are expressly advised 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 an
42、d must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting o
43、f theresponsible technical committee, which you may attend. If 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
44、 C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).A821/A821M 103
