1、Designation:A64812Standard Specification forSteel Wire,Hard-Drawn for Prestressed Concrete Pipe1This standard is issued under the fixed designation A648;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A numb
2、er in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers two classes of uncoated,high-strength,hard-drawn steel wire for use in the manufacture ofprestressed concrete pipe.I
3、n application,the wire is helicallywrapped on the pipe maintaining tension by mechanical meansnot including drawing dies.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information o
4、nlyand are not considered standard.1.3 A supplementary requirement(S1)is provided for usewhere hydrogen embrittlement(HE)resistance testing is re-quired by the purchaser.Supplementary requirement(S1),which establishes acceptance criteria for HE resistance testing,applies only when specified in the p
5、urchase order or contract.1.4 The following caveat pertains only to the test methodportions of this specification,6.3.3 and 6.5.3:This specificationdoes not purport to address the safety concerns,if any,associated with its use.It is the responsibility of the user of thisspecification to establish ap
6、propriate safety and health prac-tices and determine the applicability of regulatory limitationsprior to use.2.Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA510 Specification for General Requirements for Wire Rodsand Coarse Round Wi
7、re,Carbon SteelA700 Practices for Packaging,Marking,and Loading Meth-ods for Steel Products for Shipment(Withdrawn 2014)3A1032 Test Method for Hydrogen Embrittlement Resistancefor Steel Wire Hard Drawn Used for Prestressing ConcretePipeE328 Test Methods for Stress Relaxation for Materials andStructu
8、res2.2ANSI Standard:4C 304 Standard for Design of Prestressed Concrete CylinderPipe3.Ordering Information3.1 It shall be the responsibility of the purchaser to specifyall requirements that are necessary for material under thisspecification.Such requirements to be considered include,butare not limite
9、d to,the following:3.1.1 Quantity(weight),3.1.2 Name of material(hard-drawn steel wire for pre-stressed concrete pipe),3.1.3 Wire diameter(see Table 1),3.1.4 Class(see Table 1),3.1.5 If outside inspection is required(9.1),3.1.6 Packaging(see Section 12),3.1.7 Supplementary Requirement S1(if desired)
10、,and3.1.8 ASTM designation and year of issue.4.Manufacture4.1 The steel shall be made by the electric-arc furnace,open-hearth,or basic-oxygen process.4.2 The steel shall be free of injurious piping and unduesegregation.4.3 The wire shall be cold drawn to produce the prescribedmechanical properties.T
11、he wire manufacturer shall take de-pendable precautions during wire drawing to preclude detri-mental strain aging of the wire.NOTE1Allowing wire to remain at elevated temperatures,such as400F(204C)for more than 5 s or 360F(182C)for more than 20 s,canresult in detrimental strain aging of the wire.Det
12、rimentally strain-agedwire typically has reduced ductility and increased susceptibility tohydrogen embrittlement.4.4 There shall be no welds or joints in the finished wire.Any welds or joints made during manufacture to enablecontinuity of operations shall be removed.1This specification is under the
13、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 1,2012.Published April 2012.Originallyapproved in 1972.Last previous edition approved in 2011 as A648 11.DOI:10.
14、1520/A0648-12.2For 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 Document Summary page onthe ASTM website.3The last approved version of this historical standa
15、rd is referenced onwww.astm.org.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,P
16、A 19428-2959.United States1Copyright by ASTM Intl(all rights reserved);5.Chemical Requirements5.1 The heat analysis of the steel shall conform to thechemical requirements specified in Table 2.5.2 An analysis of each heat of steel shall be furnished bythe manufacturer showing the percentages of all the elementsspecified in Table 2.The wire shall be subject to permissiblevariation for product analysis specified in Specification A510,Table 7.6.Mechanical Property Requirements6.1 Mechanical property
