1、Designation: A 821/A 821M 05Standard Specification forSteel Wire, Hard Drawn for Prestressing Concrete Tanks1This standard is issued under the fixed designationA 821/A 821M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year
2、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.1. Scope*1.1 This specification covers uncoated, high-strength, hard-drawn steel wire for use in the manufacture of prestresse
3、dconcrete tanks and similar structures. In application, the wire iscontinuously wrapped on the structure maintaining tension bya device employing a wire drawing die, or mechanical tension-ing system without redrawing.1.2 This specification is applicable only to the condition ofthe wire as delivered
4、to the user. 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 redraw-ing.1.2.2 Type B wire is drawn to finished size by the manu-facturer for tensioning by a me
5、chanical system without redraw-ing.NOTE 1Type A wire, when tensioned by drawing through a die, maynot function properly if the user does not ensure that during application thesurface of the wire is free of rust and foreign materials that can bedetrimental to good wire drawing practice. Further, the
6、user should ensurethat proper wire drawing techniques are followed, including adequatelubrication, cooling, and proper die mechanics.1.3 The values stated in either inch-pound or SI units are tobe regarded as the standard. Within the text, the inch-poundunits are shown in parentheses. The values sta
7、ted in eachsystem are not exact equivalents; therefore, each system mustbe used independently of the other. Combining values from thetwo systems may result in nonconformance with the specifi-cation.2. Referenced Documents2.1 ASTM Standards:2A 370 Test Methods and Definitions for Mechanical Testingof
8、 Steel ProductsA 510 Specification for General Requirements for WireRods and Coarse Round Wire, Carbon SteelA 700 Practices for Packaging, Marking, and LoadingMethods for Steel Products for Domestic ShipmentA 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel ProductsE29 Prac
9、tice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3. Ordering Information3.1 It shall be the responsibility of the purchaser to specifyall requirements that are necessary for material ordered to thisspecification. Such requirements shall include, but are notli
10、mited to, the following:3.1.1 Quantity (weight),3.1.2 Name of material (hard-drawn steel wire for prestress-ing concrete tanks, Type A or B),3.1.3 Wire diameter (see Section 7),3.1.4 Marking (see Section 13),3.1.5 Certification, if required (see 12.1), and3.1.6 ASTM designation and year of issue.NOT
11、E 2A typical ordering description is as follows: 100 000 kg,Hard-Drawn Steel Wire for Prestressed Concrete Tanks Type A or B, 4.9mm in diameter, 680 kg coils for shipment on returnable coil carriers,shrouded, conforming to ASTM A 821/A 821M-XX 220 000 lb, Hard-Drawn Steel Wire for Prestressed Concre
12、te Tanks Type A or B, 0.192 in.in diameter, 1500 lb, coils for shipment on returnable coil carriers,shrouded, conforming to ASTM A 821/A 821M-XX.3.2 Prelubrication, if required, shall be specified by thepurchaser.4. Manufacture4.1 The steel shall be made by the open-hearth, basic-oxygen or electric-
13、furnace 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 desiredmechanical properties.4.4 There shall be no welds or joints in the finished wire.Welds or joints made during d
14、rawing to promote continuity ofoperations shall be removed.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 Reinforcement.Current edition approved March 1, 2005. Published
15、March 2005. Originallyapproved in 1984. Last previous edition approved in 1999 as A 821/A 821M 99.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Docu
16、ment 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, United States.5. Chemical Requirements5.1 The steel shall conform to the chemical compositionreq
17、uirements specified in Table 1.5.2 Cast or Heat AnalysisEach cast or heat of steel shallbe analyzed by the manufacturer. This analysis shall be madefrom a test specimen preferably taken during the pouring of thecast or heat; when requested, this analysis shall be reported tothe purchaser.5.3 Product
18、 AnalysisThe purchaser shall have the right tomake an analysis from the finished wire representing each castor heat of steel. The chemical composition thus obtained shallconform to the product analysis requirements specified inSpecification A 510 for the elements required or restricted.5.4 Methods,
19、Practices, and Definitions A 751 shall be usedfor chemical analysis.6. Mechanical Requirements6.1 Tensile Strength TestType A material as representedby the test specimens shall conform to the requirementsprescribed in Table 2. Type B material as represented by thetest specimens shall conform to the
20、requirements in Table 3.6.2 Wrap TestThe material as represented by the wrap testspecimens shall conform to the requirements specified in Table4.6.3 The tensile strength test and wrap test shall be made inaccordance with Methods and Definitions A 370.6.4 Torsion TestTorsion requirements shall confor
21、m tothose prescribed in Table 5 for Type A and Type B.7. Permissible Variations in Diameter7.1 The wire shall be specified as any diameter from 4.1 to6.0 mm (0.162 to 0.235 in.), inclusive.7.2 The diameter of the wire shall not vary from thatspecified by more than the tolerances shown in Table 6.8.
22、Workmanship, Finish, and Appearance8.1 The surface of the wire, as received, shall be smooth andgenerally free of rust. A light oxidation film that does not causepitting of the wire surface visible to the unaided eye afterwiping or light cleaning, shall not be cause for rejection. Themicrostructure
23、of Type A wire shall be suitable for furtherreasonable reduction of cross-sectional area during application.Coils of wire with visible pitting shall be rejected.8.2 The wire shall not have piping, cross checking, tornsurfaces, chatter marks, splits, die marks, scratches, pits, orseams that are detri
24、mental to its application.8.3 The wire shall not be kinked, improperly cast, or showa wavy condition.8.4 Each coil shall be one continuous 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 s
25、ame sizeand class and offered for inspection of one time.9.2 One test specimen shall be taken for each ten coils, orfraction thereof, in 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 ob
26、viousdefect, shall be discarded and another specimen substituted.9.5 Test specimens shall be tested for tensile strength (6.1),wrap test (6.2), and torsion test (6.4).10. Inspection10.1 Unless otherwise specified in the contract or purchaseorder, the manufacturer shall be responsible for the perfor-
27、mance of all inspection and test requirements specified in thisTABLE 1 Chemical 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, mm (in.)Tensile Strength, MPa (ksi)Min
28、Max4.1 (0.162) 1500 (218) 1780 (258)4.5 (0.177) 1470 (213) 1740 (253)4.9 (0.192) 1450 (210) 1720 (250)5.3 (0.207) 1430 (208) 1710 (248)5.7 (0.225) 1410 (204) 1680 (244)6.0 (0.235) 1390 (202) 1670 (242)ATensile strength values for intermediate diameters may be interpolated.TABLE 3 Tensile Requirement
29、s (Type B)Decimal SizeMinimum TensileStrengthMaximum TensileStrengthmm (in.) MPa (ksi) MPa (ksi)4.1 0.162 1590 231 1810 2624.9 0.192 1530 222 1740 2526.4 0.250 1450 211 1450 241TABLE 4 Wrap Test RequirementsDiameter, mm (in.) Mandrel Size4.1 to 6.0 (0.162 to 0.235), incl 2XAAX is specified wire diam
30、eter.TABLE 5 Torsion RequirementsDiameter, mm (in.) Number of Turns in 203 mm (8 in.)4.1 (0.162) 94.5 (0.177) 84.9 (0.192) 75.3 (0.207) 65.7 (0.225) 56.0 (0.235) 56.4 (0.250) 4TABLE 6 Permissible Variations in Wire DiameterNOTE 1For purposes of determining conformance with this specifi-cation, all s
31、pecified limits are absolute as defined in Practice E29.Diameter, mm (in.)PermissibleVariations,6 mm (in.)PermissibleOut-of-Round,mm (in.)4.1 to 6.0 (0.162 to 0.235) 0.05 (0.002) 0.05 (0.002)A 821/A 821M 052specification. Except as otherwise specified in the contract orpurchase order, the manufactur
32、er 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 testsset forth in this specific
33、ation when such inspections and testsare 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 manufactu
34、rer or supplier promptly and inwriting. In case of dissatisfaction with the results of the test, themanufacturer or supplier shall have the right to make claim fora rehearing.11.2 The material shall be adequately protected and cor-rectly identified so that the producer or supplier can make aproper i
35、nvestigation.12. Certification12.1 When specified in the purchase order or contract, aproducers or suppliers certification shall be furnished to thepurchaser that the material was manufactured, tested, andinspected in accordance with this specification and has beenfound to meet the requirements. The
36、 certification shall includethe specification number, year/date of issue and 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
37、same validity as a counterpart printed inthe certifiers facility. The content 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 org
38、anization submitting the EDItransmission is responsible for the content of the report.NOTE 3The 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 size of the wire, purchase order number
39、, ASTMspecification designation, cast or heat number, and name ormake of the manufacturer shall be marked on a weather-resistant tag securely attached to each coil of wire.14. Packaging14.1 When specified in the purchase order, packaging shallbe in accordance with the procedures in Practices A 700.1
40、5. Keywords15.1 prestressed concrete; steel wireSUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A 821/A 821M 99) that may impact the use of this standard.(1) Revised sections 3.1, 5.1, 5.3, 7.1, 9.3, 9.4, 10.1, 11.1, and11.2.(2) A
41、dded section 12.2 and Note 3.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 advised that determination of the validity of any such patent rights, and the riskof inf
42、ringement 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, either reapproved or withdrawn. Your comments are invited either for revision of this stand
43、ard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your vi
44、ews 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. 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).A 821/A 821M 053
