1、Designation:A416/A416M17Standard Specification forLow-Relaxation,Seven-Wire Steel Strand for PrestressedConcrete1This standard is issued under the fixed designation A416/A416M;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()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification covers two gra
3、des of low-relaxation,seven-wire steel strand for use in prestressed concrete con-struction.Grade 250 1725 and Grade 270 1860 haveminimum tensile strengths of 250 ksi 1725 MPa and 270 ksi1860 MPa,respectively,based on the nominal area of thestrand.1.2 A supplementary requirement(S1)is provided for u
4、sewhere bond strength testing of 0.600-in.15.24-mm diameterGrade 270 1860 strand for applications in prestressed groundanchors is required by the purchaser.The supplementaryrequirement applies only when specified in the purchase order.1.3 The text of this specification contains notes or footnotes,or
5、 both,that provide explanatory material.Such notes andfootnotes do not contain any mandatory information.1.4 This specification is applicable for orders in eitherinch-pound units(as Specification A416)or in SI units(asSpecification A416M).1.5 The values stated in either inch-pound units or SI unitsa
6、re 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 result in non-conformance with thespecificati
7、on.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers
8、to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A981/A981M Test Method for Evaluating Bond Strength for0.600-in.15.24-mm Diameter Steel Prestressing Strand,Grade 270 1860,Uncoated,Used in Prestressed GroundAnchorsA1061/A1061M Test Methods for Testing Multi-Wire SteelPrestressing Str
9、and2.2 U.S.Military Standard:3MIL-STD-129 Marking for Shipment and Storage2.3 U.S.Federal Standard:3Fed.Std.No.123 Marking for Shipments(Civil Agencies)3.Terminology3.1 Definition of Term Specific to This Specification:3.1.1 strand,na group of wires having a center wireenclosed tightly by six helica
10、lly placed outer wires withuniform pitch of not less than 12 and not more than 16 timesthe nominal diameter of the strand.3.1.1.1 DiscussionThe direction of lay is either right-handed or left-handed.4.Ordering Information4.1 It shall be the responsibility of the purchaser to specifyall requirements
11、that are necessary for material ordered underthis specification.Such requirements to be considered include,but are not limited to,the following:4.1.1 Quantity(feet metres),4.1.2 Nominal diameter of strand,4.1.3 Grade of strand,4.1.4 Specially dimensioned strand(7.4),if desired,4.1.5 Weldless,if desi
12、red(8.1),4.1.6 Outside inspection,if required(11.1),4.1.7 Load-elongation curve,if desired(13.2),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 editi
13、on approved May 1,2017.Published May 2017.Originallyapproved in 1957.Last previous edition approved in 2016 as A416/A416M 16.DOI:10.1520/A0416_A0416M-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStanda
14、rds volume information,refer to the standards Document Summary page onthe ASTM website.3Available from DLA Document Services,Building 4/D,700 Robbins Ave.,Philadelphia,PA 19111-5094,http:/quicksearch.dla.mil.*A Summary of Changes section appears at the end of this standardCopyright ASTM Internationa
15、l,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Re
16、commendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 4.1.8 Packaging(14.1),4.1.9 Supplementary Requirement S1,if desired,and4.1.10 ASTM designation A416 A416M and year of issue.5.Materials and Manufacture5.1 Base MetalThe base metal shall be carbon steel ofsuch quality that when drawn to wire,fabricated into strand,and then thermally treated,shall have the properties andcharacteristics prescribed in this specification.5.2 WireThe wire from which the st
