1、Designation:A970/A970M16Standard Specification forHeaded Steel Bars for Concrete Reinforcement1This standard is issued under the fixed designation A970/A970M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A
2、 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 deformed steel reinforcingbars in cut lengths,with a head attached to one or both ends,forconcrete reinforceme
3、nt.Heads are forge-formed,machinedfrom bar stock,or cut from plate.Attachment can be accom-plished through:1.1.1 Welding;1.1.2 Integrally hot forging of a head from the reinforcingbar end;1.1.3 Internal threads in the head mating to threads on thebar end;1.1.4 Cold-swaging an externally threaded cou
4、pling sleeveonto the reinforcing bar;1.1.5 Cold-extruding an external coupling sleeve onto thereinforcing bar;1.1.6 Cold-swaging an external coupling sleeve or headedsleeve onto the reinforcing bar;1.1.7 Attaching a coupling sleeve to the end of the reinforc-ing bar by means of the means of a ferrou
5、s-filler medium;or1.1.8 Separate threaded nut to secure the head to the bar.NOTE1The requirements of this specification are only applicable toheaded bars where the attachment of the head is accomplished by one ofthe methods listed in 1.1.1.2 Limitations on head dimensions and on obstructions andinte
6、rruptions of bar deformations on the non-planar features onthe bearing face of the head are presented in Annex A1.Therequirements in Annex A1 only apply when specified by thepurchaser(see 4.2.3).1.3 This specification is applicable for orders in eitherinch-pound units as Specification A970 or SI uni
7、ts as Specifi-cation A970M.1.4 The values stated in either inch-pound units or SI unitsare 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 othe
8、r.Combining valuesfrom the two systems may result in non-conformance with thespecification.1.5 This specification does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health prac
9、tices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA615/A615M Specification for Deformed and Plain Carbon-Steel Bars for Concrete ReinforcementA700 Guide for
10、Packaging,Marking,and Loading Methodsfor Steel Products for ShipmentA706/A706M Specification for Deformed and Plain Low-Alloy Steel Bars for Concrete Reinforcement2.2 AWS Standards:3AWS C6.1 Recommended Practices for Friction WeldingAWS D1.4 D1.4M Structural Welding Code-ReinforcingSteel2.3 U.S.Mili
11、tary Standard:4MIL-STD-129 Marking for Shipment and Storage2.4 U.S.Federal Standard:4Fed.Std.No.123 Marking for Shipment(Civil Agencies)2.5 ACI Standard:5ACI 318 Building Code Requirements for Structural Con-crete3.Terminology3.1 Definitions of Terms Specific to This Specification:1This specificatio
12、n 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 edition approved March 1,2016.Published March 2016.Originallyapproved in 1997.Last previous edition approved in 2015 as
13、A970/A970M 151.DOI:10.1520/A0970_A0970M-16.2For 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.3Available from America
14、n Welding Society(AWS),550 NW LeJeune Rd.,Miami,FL 33126,http:/www.aws.org.4Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.Or visit:http:/assist.daps.dla.mil/online.5Available from American Concrete Institute(ACI),P.O.Box 90
15、94,FarmingtonHills,MI 48333-9094,http:/www.concrete.org.*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 States1 3.1.1 cold-extruded coupling sleeve headed bar,nsteelreinforcing bar
16、that has the head(s)attached by means of acoupling sleeve that is axially cold-extruded onto the barend(s).3.1.1.1 DiscussionSimilar to cold-swaged threaded cou-pling sleeve headed bar.This extruded coupling sleeve consistsof an axially extruded sleeve portion that engages the deformedreinforcing bar and a pre-threaded integral stud with externalthreads,which match threads internal to the head(s).The headis screwed onto the mating threads on the extruded couplingsleeve.The threads may be paralle
