1、Designation: A821/A821M 10A821/A821M 15Standard 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,
2、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*1.1 This specification covers uncoated, high-strength, hard-drawn steel wire for use in the construction of p
3、restressed concretetanks and similar structures. In application, the wire is continuously wrapped on the structure maintaining tension by a device usinga wire drawing die, or mechanical tensioning system without re-drawing.1.2 This specification is applicable only to the condition of the wire as del
4、ivered to the purchaser. 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 a wire drawing die or by a mechanical system without re-drawing.1.2.2 Type B wire is drawn to finished size by the manufacturer for tensio
5、ning by a mechanical system without re-drawing.NOTE 1Type A wire, when tensioned by drawing through a die, may not function properly if the purchaser does not ensure that during applicationthe surface of the wire is free of rust and foreign materials that can be detrimental to good wire drawing prac
6、tice. Further, the purchaser should ensurethat proper wire drawing techniques are followed, including adequate lubrication, cooling, and proper die mechanics.1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes(excluding those in
7、tables and figures) shall not be considered as requirements of the standard.1.4 This specification is applicable for orders in either inch-pounds units (as SpecificationA821) or in SI units (as SpecificationA821M).1.5 The values stated in either inch-pound units or SI units are to be regarded separa
8、tely as standard. Within the text, the SI unitsare shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be usedindependently of the other. Combining values from the two systems may result in non-conformance with the standard.2. Referenced Doc
9、uments2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA510 Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon SteelA700 Guide for Packaging, Marking, and Loading Methods for Steel Products for ShipmentA751A938 Test Methods
10、, Practices, and Terminology for Chemical Analysis of Steel ProductsMethod for Torsion Testing ofWireE29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications3. Ordering Information3.1 It shall be the responsibility of the purchaser to specify all requiremen
11、ts that are necessary for material ordered to thisspecification. Such requirements shall include, but are not limited to, the following:3.1.1 Quantity (weight) mass,3.1.2 Name of material (hard-drawn steel wire for prestressed concrete tanks, Type A wire or Type B wire),3.1.3 Wire diameter,3.1.4 Cer
12、tification, if required (12.1),3.1.5 Marking (13.1),3.1.6 Packaging (14.1), and1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.05on Steel Reinforcement.Current edition approved Nov. 1
13、, 2010May 1, 2015. Published December 2010May 2015. Originally approved in 1984. Last previous edition approved in 20052010 asA821/A821M 05.A821/A821M 10. DOI: 10.1520/A0821_A0821M-10.10.1520/A0821_A0821M-15.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer
14、 Service at serviceastm.org. For Annual Book of ASTM Standardsvolume 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 pr
15、evious version. Becauseit may not be technically possible 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 C
16、hanges section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.7 ASTM designation and year of issue.3.2 Pre-lubrication, if required, shall be specified by the purchaser. purchaser (see Note 2).N
17、OTE 2Pre-lubrication refers to the intentional addition or residue of solid lubricant on the wire surface prior to shipment to facilitate redrawing forType A wire. Pre-lubrication is not used in Type B wire.4. Manufacture4.1 The steel shallmay be made by the electric-arc furnace, basic-oxygen, or op
18、en-hearth process. any commercially acceptedsteel-making process. The steel may be either ingot cast or strand cast.4.2 The steel shouldshall be of such quality, that the finished wire shall be free of detrimental pipe and undue segregation.4.3 The wire shall be cold-drawn to produce the prescribed
19、mechanical properties.4.4 There shall be no welds or joints in the finished wire. Welds or joints made during drawing to enable continuity of operationsshall be removed.5. Chemical Composition Requirements5.1 The steel shall conform to the chemical composition requirements specified in Table 1.5.2 H
20、eat AnalysisEachAn analysis of each heat of steel shall be analyzed by the manufacturer. This analysis furnished by themanufacturer showing the percentages of all the elements specified in Table 1shall be made from a test specimen preferably takenduring the pouring of the heat; when requested, this
21、analysis shall be reported. The wire shall be subject to permissible variationfor product analysis specified in Specification A510to the purchaser. , Table 7.5.3 Product AnalysisThe purchaser shall have the right to make an analysis from the finished wire representing each heat ofsteel. The chemical
22、 composition thus obtained shall conform to the product analysis requirements specified in Specification A510for the elements required or restricted.5.4 Test Methods, Practices, and Terminology A751 shall be used for chemical analysis.6. Mechanical Property Requirements6.1 Tensile Strength TestType
23、A wire as represented by the test specimens shall conform to the requirements prescribed inTable 2. Type B wire as represented by the test specimens shall conform to the requirements in Table 3.6.2 Wrap TestThe wire as represented by the wrap-test specimens shall conform to the requirements prescrib
24、ed in Table 4.6.3 The tensile strength test and wrap test shall be made in accordance with Test Methods and Definitions A370, Annex A4.6.4 Torsion TestTorsion requirements shall conform to those prescribed in Table 5 for Type A wire and Type B wire. The testshall be completed within 15 to 30 seconds
25、,conducted according to Test Method A938and length change shall be unrestrained. .7. Permissible Variations in Diameter7.1 The diameter of the wire shall not vary from that specified by more than the tolerances shown in Table 6.7.2 If wire diameters other than those specified in Table 2, Table 3, an
26、d Table 5 are ordered, tensile strength values and torsionvalues may be interpolated.7.3 For purposes of determining conformance with this specification, all specified limits are absolute as defined in Practice E29.TABLE 1 Chemical Composition RequirementsElement Composition, %Carbon 0.50 to 0.85Man
27、ganese 0.60 to 1.10Phosphorus, max 0.040Sulfur, max 0.050Silicon 0.10 to 0.35TABLE 1 Chemical Composition RequirementsElement Composition, %Carbon 0.50 to 0.85Manganese 0.60 to 1.10Phosphorus, max 0.040Sulfur, max 0.050Silicon 0.10 to 0.35A821/A821M 1528. Workmanship, Finish, and Appearance8.1 The s
28、urface of the wire, as received, shall be smooth and generally free of rust. rust (see Note 3).Alight oxidation film thatdoes not cause pitting of the wire surface visible to a person with normal or corrected vision after wiping or light cleaning, shallnot be cause for rejection. TypeAwire shall be
29、suitable for further reasonable 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, torn surfaces, chatter marks, splits, die marks, scratches, pits, or seams thatare detrimental to its applicat
30、ion.8.3 The wire shall not be kinked, improperly cast, or show a 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.NOTE 3The wire should be protected to help mitigate the formation of oxidation on the surface of the wire d
31、uring storage and transportation.9. Sampling and Number of Tests9.1 A lot shall consist of all the coils of wire of the same size and class and offered for inspection at one time.9.2 One At a minimum, one test specimen shall be taken for each ten coils, or fraction thereof, in a lot. Each heat in a
32、givenlot shall be tested.TABLE 2 Tensile Requirements (Type A)ADiameter, in. mm Tensile Strength, ksi MPaMin Max0.162 4.1 218 1500 258 17800.177 4.5 213 1470 253 17400.192 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 1670TABLE 2 Tensile Requiremen
33、ts (Type A)Diameter, in. mm Tensile Strength, ksi MPaMin Max0.162 4.1 218 1500 258 17800.177 4.5 213 1470 253 17400.192 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 1670A Tensile strength values for intermediate diameters may be interpolated.TABLE
34、 3 Tensile Requirements (Type B)align=“center“ colwidth=“0.53in“ align=“center“colwidth=“0.51in“align=“center“ colwidth=“0.53in“Decimal Size Minimum Tensile Strength Maximum Tensile Strengthin. mm ksi MPa ksi MPa0.162 4.1 231 1590 262 18100.192 4.9 222 1530 252 17400.250 6.4 211 1450 241 1450TABLE 3
35、 Tensile Requirements (Type B)Decimal Size, in. mm Minimum Tensile Strength, ksi MPaMin Max0.162 4.1 231 1590 262 18100.192 4.9 222 1530 252 17400.250 6.4 211 1450 241 1660TABLE 4 Wrap-Test RequirementsDiameter, in. mm Mandrel Size0.162 to 0.250 4.1 to 6.4, incl 2XATABLE 4 Wrap-Test RequirementsDiam
36、eter, in. mm Mandrel Size0.162 to 0.250 4.1 to 6.4, incl 2XAA X is specified wire diameter.A821/A821M 1539.3 Test specimens cut from either end of the coil are permitted.9.4 Any test specimen showing the presence of an obvious defect, shall be discarded and another specimen substituted.9.5 Test spec
37、imens 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 purchase order or contract, the manufacturer shall be responsible for the performance ofall inspection and test requirements specified in this specification.
38、 Except as otherwise specified in the purchase order or contract,the manufacturer shall be permitted to use ones own or any other suitable facilities for the performance of the inspection and testrequirements unless disapproved by the purchaser at the time the order is placed. The purchaser shall ha
39、ve the right to performany of the inspections and tests set forth in this specification when such inspections and tests are deemed necessary to assure thatthe material conforms to prescribed requirements.11. Rejection and Rehearing11.1 Material that fails to conform to the requirements of this speci
40、fication shall be subject to rejection. Rejections shall bereported to the manufacturer promptly and in writing. In case of dissatisfaction with the results of the test, the manufacturer shallhave the right to make claim for a rehearing.11.2 The material shall be adequately protected and correctly i
41、dentified so that the manufacturer can make a properinvestigation.12. Certification12.1 When specified in the purchase order or contract, a manufacturers certification shall be furnished to the purchaser that thematerial was manufactured, tested, and inspected in accordance with this specification a
42、nd has been found to meet therequirements. The certification shall include the specification number, year/date of issue and revision letter, if any.12.2 A material test report, certificate of inspection, or similar document printed from or used in electronic form from anelectronic data interchange (
43、EDI) transmission shall be regarded as having the same validity as a counterpart printed in thecertifiers facility. The content of the EDI transmitted document must meet the requirements of the invokedASTM standard(s) andconform to any existing EDI agreement between the purchaser and the supplier. N
44、otwithstanding the absence of a signature, theorganization submitting the EDI transmission is responsible for the content of the report.TABLE 5 Torsion RequirementsDiameter, in. mm Number of Turns in 8 in. 203 mm0.162 4.1 90.177 4.5 80.192 4.9 70.207 5.3 60.225 5.7 50.235 6.0 50.250 6.4 4TABLE 5 Tor
45、sion RequirementsDiameter, in. mm Minimum Number of Turns to Failure in8 in. 200 mm0.162 4.1 90.177 4.5 80.192 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,in. mmPermissibleOut-of-Round,in. mm0.162 to 0.250 4.1
46、to 6.4 0.002 0.05 0.002 0.05TABLE 6 Permissible Variations in Wire DiameterDiameter, in. mmPermissibleVariations,in. mmPermissibleOut-of-Round,in. mm0.162 to 0.250 4.1 to 6.4 0.002 0.05 0.002 0.05A821/A821M 154NOTE 4The industry definition as invoked here is: EDI is the computer-to-computer exchange
47、 of business information in a standard format such asANSI ASC X12.13. Marking13.1 The type of wire, size of the wire, purchase order number, ASTM specification designation A821/A821M, heat number,and name of the manufacturer shall be marked on a weather-resistant tag securely attached to each coil o
48、f wire.14. Packaging14.1 When specified in the purchase order or contract, packaging shall be in accordance with the procedures in Practices A700.15. Keywords15.1 prestressed concrete tanks; steel wireSUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard si
49、nce the last issue(A821/A821M 05A821/A821M 10) that may impact the use of this standard. (Approved Nov. 1, 2010May1, 2015.)(1) Revised theAdded Note 2 title.and Note 3 and renumbered subsequent notes.(2) Corrected errors,Revised 4.1 made editorial improvements, and re-positioned the units throughout the specification.to matchlanguage in other similar specifications.(3) Revised Secti
