1、Designation:A722/A722M18Standard Specification forHigh-Strength Steel Bars for Prestressed Concrete1This standard is issued under the fixed designation A722/A722M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revis
2、ion.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 Type I and Type II high-strength steel bars intended for use in prestressed concreteconstruction or in pr
3、estressed ground anchors.Type I bars havea plain surface.Type II bars have surface deformations.Barsare of a minimum tensile strength level of 150 000 psi 1035MPa.1.2 A supplementary requirement(S1)is provided for usewhere bend tests of bars are required by the purchaser.Thesupplementary requirement
4、 applies only when specified in thepurchase order.1.3 The text of this specification references notes andfootnotes which provide explanatory material.These notes andfootnotes(excluding those in tables and figures)shall not beconsidered as requirements of the specification.1.4 This specification is a
5、pplicable for orders in eitherinch-pound units(as Specification A722)or in SI units(asSpecification A722M).1.5 The values stated in either inch-pound or SI units are tobe regarded separately as standard.Within the text,the SI unitsare shown in brackets.The values stated in each system maynot be exac
6、t equivalents;therefore,each system shall be usedindependently of the other.Combining values from the twosystems may result in non-conformance with the specification.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization establishe
7、d in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel Product
8、sA700 Guide for Packaging,Marking,and Loading Methodsfor Steel Products for ShipmentA751 Test Methods,Practices,and Terminology for Chemi-cal Analysis of Steel Products2.2 Military Standard:3MIL-STD-129 Marking for Shipment and Storage2.3U.S.Federal Standard:3Fed.Std.123 Marking for Shipment(Civil A
9、gencies)3.Ordering Information3.1 Orders for high-strength steel bars under this specifica-tion shall contain the following information:3.1.1 Quantity,3.1.2 Size and length,3.1.3 Type I or Type II,and3.1.4 ASTM designation A722 A722M and year-date ofissue.3.2 The purchaser shall have the option to s
10、pecify additionalrequirements,including but not limited,to the following:3.2.1 Report on chemical composition(5.1),3.2.2 Special inspection requirements(14.2),3.2.3 Load-elongation curve(16.2),3.2.4 Special preparation for delivery,if desired(see Sec-tion 17),and3.2.5 Supplementary requirement(S1).4
11、.Materials and Manufacture4.1 The bars shall be rolled from properly identified heats ofmold-cast or strand-cast steel.The standard sizes and dimen-sions of Type I and II bars shall be those listed in Table 1 andTable 2,respectively.1This specification is under the jurisdiction of ASTM Committee A01
12、 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.05 on Steel Reinforcement.Current edition approved Sept.1,2018.Published September 2018.Originallyapproved in 1975.Last previous edition approved in 2015 as A722/A722M 15.DOI:10.1520/A0722_A0722M-18.2For
13、 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.3Available from Standardization Documents Order Desk,DODSSP,Bldg.4,Sec
14、tionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordanc
15、e with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 4.2 The bars shall be subjected to col
16、d-stressing to not lessthan 80%of the minimum tensile strength,and then shall bestress-relieved,to produce the prescribed tensile properties.5.Chemical Composition5.1 A chemical analysis of each heat of steel shall bedetermined in accordance with Test Methods,Practices,andTerminology A751.The manufacturer shall make the analysison test samples taken during the pouring of the heat.Whenrequested in the purchase order or contract,the chemicalcomposition determined shall be reported to the purchaser