1、Designation:A821/A821M15Standard 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 last re
2、vision.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 prestressedconcrete tanks
3、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 purchaser.It is n
4、ot 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 mechanical system with
5、out re-drawing.NOTE1Type 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 purchasershould ensu
6、re that proper wire drawing techniques are followed,includingadequate lubrication,cooling,and proper die mechanics.1.3 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas
7、requirements of the standard.1.4 This specification is applicable for orders in eitherinch-pounds units(as Specification A821)or in SI units(asSpecification A821M).1.5 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard.Within the text,theSI units are sh
8、own 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 result in non-conformance with thestandard.2.Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions f
9、or Mechanical Testingof Steel ProductsA510 Specification for General Requirements for Wire Rodsand Coarse Round Wire,Carbon SteelA700 Guide for Packaging,Marking,and Loading Methodsfor Steel Products for ShipmentA938 Test Method for Torsion Testing of WireE29 Practice for Using Significant Digits in
10、 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 notlimited to,the following:3.1.1 Quantity(w
11、eight)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 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
12、 specified by thepurchaser(see Note 2).NOTE2Pre-lubrication refers to the intentional addition or residue ofsolid lubricant on the wire surface prior to shipment to facilitate redrawingfor Type A wire.Pre-lubrication is not used in Type B wire.4.Manufacture4.1 The steel may be made by any commercial
13、ly acceptedsteel-making process.The steel may be either ingot cast orstrand cast.4.2 The steel shall be of such quality,that the finished wireshall be free of detrimental pipe and undue segregation.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Relat
14、ed Alloys and is the direct responsibility of SubcommitteeA01.05 on Steel Reinforcement.Current edition approved May 1,2015.Published May 2015.Originallyapproved in 1984.Last previous edition approved in 2010 as A821/A821M 10.DOI:10.1520/A0821_A0821M-15.2For referenced ASTM standards,visit the ASTM
15、website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Dr
16、ive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 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 during 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 An analysis of each heat of steel shall be furnished bythe manufacturer showing the