1、Designation: A706/A706M 09bStandard Specification forLow-Alloy Steel Deformed and Plain Bars for ConcreteReinforcement1This standard is issued under the fixed designation A706/A706M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision,
2、the year 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 Department of Defense.1. Scope*1.1 GeneralThis specificatio
3、n covers deformed and plainlow-alloy steel bars in cut lengths or coils for concretereinforcement intended for applications where restrictive me-chanical properties and chemical composition are required forcompatibility with controlled tensile property applications or toenhance weldability. The stan
4、dard sizes and dimensions ofdeformed bars and their number designations are given inTable 1. The text of this specification references notes andfootnotes that provide explanatory material. These notes andfootnotes, excluding those in tables, shall not be considered asrequirements of this specificati
5、on.1.2 GradeBars are of two minimum yield strength levels:namely, 60 000 psi 420 MPa and 80 000 550, designated asGrade 60 420 and Grade 80 550, respectively.NOTE 1Bars designated as Grade 80 550, which were introduced inthe A706/A706M 09a revision, may be outside consideration of consen-sus design
6、codes and specifications.1.3 Plain bars, in sizes up to and including 212 in. 63.5 mmin diameter in coils or cut lengths, when ordered, shall befurnished under this specification. For ductility properties(elongation and bending), test provisions of the nearest smallernominal diameter deformed bar si
7、ze shall apply.1.4 Controlled Tensile PropertiesThis specification limitsmechanical properties (Table 2) to provide the desired yield/tensile properties for controlled tensile property applications.1.5 WeldingThis specification limits chemical composi-tion (6.2) and carbon equivalent (6.4) to enhanc
8、e the weldabil-ity of the material. When steel is to be welded, a weldingprocedure suitable for the chemical composition and intendeduse or service should be used. The use of the latest edition ofAWS D1.4/D1.4M is recommended. This document describesthe proper selection of the filler metals, preheat
9、/interpasstemperatures, as well as, performance and procedure qualifi-cation requirements.1.6 This specification is applicable for orders in eitherinch-pound units (Specification A706) or in SI units Specifi-cation A706M.1.7 The values stated in either inch-pound units or SI unitsare to be regarded
10、as standard. Within the text, the SI units areshown in brackets. The values stated in each system are notexact equivalents; therefore, each system must be used inde-pendently of the other. Combining values from the two systemsmay result in nonconformance with this specification.1.8 This standard doe
11、s 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 practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Stan
12、dards:2A6/A6M Specification for General Requirements for RolledStructural Steel Bars, Plates, Shapes, and Sheet PilingA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA510 Specification for General Requirements for WireRods and Coarse Round Wire, Carbon SteelA510M Specificati
13、on for General Requirements for WireRods and Coarse Round Wire, Carbon Steel (Metric)A615/A615M Specification for Deformed and PlainCarbon-Steel Bars for Concrete ReinforcementA700 Practices for Packaging, Marking, and Loading Meth-ods for Steel Products for ShipmentA751 Test Methods, Practices, and
14、 Terminology for Chemi-cal Analysis of Steel ProductsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 AWS Standard:3AWS D1.4/D1.4M Structural Welding CodeReinforcingSteel1This specification is under the jurisdiction of ASTM Committee A01 on Steel,
15、Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.05 on Steel Reinforcement.Current edition approved Nov. 15, 2009. Published December 2009. Originallyapproved in 1974. Last previous edition approved in 2009 as A706/A706M 09a.DOI: 10.1520/A0706_A0706M-09B.2For re
16、ferenced 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 American Welding Society (AWS), 550 NW LeJeune Rd.,M
17、iami, FL 33126, http:/www.aws.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.2.3 Government Standard:4MIL-STD-129 Marking for Shipment and Storage2.4 U.S. Federal
18、 Standard:4Fed. Std. No. 123 Marking for Shipment (Civil Agencies)3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 deformations, ntransverse protrusions on a de-formed bar.3.1.2 deformed bar, nsteel bar with protrusions; a barthat is intended for use as reinforcement in reinfor
19、ced concreteand related construction.3.1.2.1 DiscussionThe surface of the bar is provided withlugs or protrusions that inhibit longitudinal movement of thebar relative to the concrete surrounding the bar in suchconstruction. The lugs or protrusions conform to the provisionsof this specification.3.1.
20、3 plain bar, nsteel bar without protrusions.3.1.4 rib, nlongitudinal protrusions on a deformed bar.4. Ordering Information4.1 It shall be the responsibility of the purchaser to specifyall requirements that are necessary for material ordered to thisspecification. Such requirements shall include, but
21、are notlimited to, the following:4.1.1 Quantity (weight) mass,4.1.2 Name of material (low-alloy steel deformed and plainbars for concrete reinforcement),4.1.3 Size,4.1.4 Grade,4.1.5 Cut lengths or coils,4.1.6 Deformed or plain,4.1.7 Packaging (see Section 17), and4.1.8 ASTM designation and year of i
22、ssue.5. Material and Manufacture5.1 The bars shall be processed from properly identifiedheats of mold-cast or strand-cast steel.5.2 The steel shall be made by one of the followingprocesses: electric-furnace, basic-oxygen, or open-hearth.6. Chemical Composition6.1 The chemical analysis of each heat s
23、hall be determinedin accordance with Test MethodsA751. The manufacturer shallmake the analysis on test samples taken preferably during thepouring of the heat. The percentages of carbon, manganese,phosphorus, sulfur, silicon, copper, nickel, chromium, molyb-denum, and vanadium shall be determined.6.2
24、 The chemical composition as shown by heat analysisshall be limited by the following:Element max, %CarbonManganese0.301.50Phosphorus 0.035Sulfur 0.045Silicon 0.506.3 Choice and use of alloying elements, combined withcarbon, phosphorus, and sulfur to produce the mechanicalproperties prescribed in Tab
25、le 2 and Table 3, shall be made bythe manufacturer. Elements commonly used include manga-nese, silicon, copper, nickel, chromium, molybdenum, vana-dium, columbium, titanium, and zirconium.4Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia,
26、 PA 19111-5098, http:/www.dodssp.daps.mil.TABLE 1 Deformed Bar Designation Numbers, Nominal Weights Masses, Nominal Dimensions, and Deformation RequirementsBarDesig-nationNo.Nominal Weight, lb/ftNominal Mass,kg/mNominal DimensionsADeformation Requirements, in. mmDiameter,in. mmCross-Sectional Areain
27、.2mm2Perimeter,in. mmMaximum AverageSpacingMinimum AverageHeightMaximum Gap(Chord of 12.5 % ofNominal Perimeter)3 10 0.376 0.560 0.375 9.5 0.11 71 1.178 29.9 0.262 6.7 0.015 0.38 0.143 3.64 13 0.668 0.994 0.500 12.7 0.20 129 1.571 39.9 0.350 8.9 0.020 0.51 0.191 4.95 16 1.043 1.552 0.625 15.9 0.31 1
28、99 1.963 49.9 0.437 11.1 0.028 0.71 0.239 6.16 19 1.502 2.235 0.750 19.1 0.44 284 2.356 59.8 0.525 13.3 0.038 0.97 0.286 7.37 22 2.044 3.042 0.875 22.2 0.60 387 2.749 69.8 0.612 15.5 0.044 1.12 0.334 8.58 25 2.670 3.973 1.000 25.4 0.79 510 3.142 79.8 0.700 17.8 0.050 1.27 0.383 9.79 29 3.400 5.060 1
29、.128 28.7 1.00 645 3.544 90.0 0.790 20.1 0.056 1.42 0.431 10.910 32 4.303 6.404 1.270 32.3 1.27 819 3.990 101.3 0.889 22.6 0.064 1.63 0.487 12.411 36 5.313 7.907 1.410 35.8 1.56 1006 4.430 112.5 0.987 25.1 0.071 1.80 0.540 13.714 43 7.65 11.38 1.693 43.0 2.25 1452 5.32 135.1 1.185 30.1 0.085 2.16 0.
30、648 16.518 57 13.60 20.24 2.257 57.3 4.00 2581 7.09 180.1 1.58 40.1 0.102 2.59 0.864 21.9AThe nominal dimensions of a deformed bar are equivalent to those of a plain round bar having the same weight mass per foot metre as the deformed bar.TABLE 2 Tensile RequirementsGrade 60 420 Grade 80 550Tensile
31、strength, min, psi MPa 80 000 550A100 000 690AYield strength, min, psi MPa 60 000 420 80 000 550Yield strength, max, psi MPa 78 000 540 98 000 675Elongation in 8 in. 200 mm, min, %Bar Designation Nos.3, 4, 5, 6 10, 13, 16, 19 14 127, 8, 9, 10, 11 22, 25, 29, 32, 36 12 1214, 18 43, 57 10 10ATensile s
32、trength shall not be less than 1.25 times the actual yield strength.TABLE 3 Bend Test RequirementsBar Designation No.Pin Diameter for 180 Bend TestsGrade 60 420 Grade 80 5503, 4, 5 10, 13, 16 3dA312 dA6, 7, 8 19, 22, 25 4d 5d9, 10, 11 29, 32, 36 6d 7d14, 18 43, 57 8d 9dAd = nominal diameter of speci
33、men.A706/A706M 09b26.4 The heat analysis shall be such as to provide a carbonequivalent (C.E.) not exceeding 0.55 % as calculated by thefollowing formula:C.E. 5 %C1%Mn61%Cu401%Ni201%Cr102%Mo502%V10(1)6.5 Product (Check) Verification AnalysisAproduct checkanalysis made by the purchaser shall not exce
34、ed the followingpercentages:Element max, %CarbonManganese0.33 %1.56 %Phosphorus 0.043 %Sulfur 0.053 %Silicon 0.55 %7. Requirements for Deformations7.1 Deformations shall be spaced along the bar at substan-tially uniform distances. The deformations on opposite sides ofthe bar shall be similar in size
35、, shape, and pattern.7.2 The deformations shall be placed with respect to the axisof the bar so that the included angle is not less than 45. Wherethe line of deformations forms an included angle with the axisof the bar from 45 to 70, inclusive, the deformations shallreverse alternately in direction
36、on each side, or those on oneside shall be reversed in direction from those on the oppositeside. Where the line of deformation is over 70, a reversal indirection shall not be required.7.3 The average spacing or distance between deformationson each side of the bar shall not exceed710 of the nominaldi
37、ameter of the bar.7.4 The overall length of deformations shall be such that thegap (measured as a chord) between the ends of the deforma-tions shall not exceed 12.5 % of the nominal perimeter of thebar. Where the ends terminate in a rib, the width of the rib shallbe considered as the gap between the
38、se ends. The summationof the gaps shall not exceed 25 % of the nominal perimeter ofthe bar. The nominal perimeter of the bar shall be 3.1416 timesthe nominal diameter.7.5 The spacing, height, and gap of deformations shallconform to the requirements prescribed in Table 1.8. Measurements of Deformatio
39、ns8.1 The average spacing of deformations shall be deter-mined by measuring the length of a minimum of 10 spaces anddividing that length by the number of spaces included in themeasurement. The measurement shall begin from a point on adeformation at the beginning of the first space to a correspond-in
40、g point on a deformation after the last included space.Spacing measurements shall not be made over a bar areacontaining bar marking symbols involving letters or numbers.8.2 The average height of deformations shall be determinedfrom measurements made on not less than two typical defor-mations. Determ
41、inations shall be based on three measurementsper deformation, one at the center of the overall length and theother two at the quarter points of the overall length.8.3 Insufficient height, insufficient circumferential cover-age, or excessive spacing of deformations shall not constitutecause for rejec
42、tion unless it has been clearly established bydeterminations on each lot (see Note 2) tested that typicaldeformation height, gap, or spacing do not conform to theminimum requirements prescribed in Section 7. No rejectionshall be made on the basis of measurements if fewer than tenadjacent deformation
43、s on each side of the bar are measured.NOTE 2As used within the intent of 8.3, the term “lot” shall mean allthe bars of one bar size and pattern of deformations contained in anindividual shipping release or shipping order.9. Mechanical Requirements9.1 Tensile Properties:9.1.1 The material, as repres
44、ented by the test specimens,shall conform to the requirements for tensile properties pre-scribed in Table 2. The yield strength or yield point shall bedetermined by one of the following methods:9.1.1.1 Offset method (0.2 % offset) as described in TestMethods and Definitions A370. A second tensile te
45、st resultshall also be required. In addition, the stress corresponding toa tensile strain of 0.0035 shall be a minimum of 60 000 psi420 MPa for Grade 60 420 and a minimum of 80 000 psi550 MPa for Grade 80 550. The value of stress correspond-ing to a tensile strain of 0.0035 shall be reported in the
46、testreport (13.1.3).9.1.1.2 By the drop of the beam or halt in the gage of thetensile testing machine, where the steel tested has a sharp-kneed or well-defined type of yield point.9.1.2 The percentage of elongation shall be as prescribed inTable 2.9.2 Bending Properties:9.2.1 The bend test specimen
47、shall withstand being bentaround a pin without cracking on the outside radius of the bentportion. The requirements for degree of bending and sizes ofpins are prescribed in Table 3. When material is furnished incoils, the test specimen shall be straightened prior to placing itin the bend tester.9.2.2
48、 The bend test shall be made on specimens of sufficientlength to ensure free bending and with apparatus that provides:9.2.2.1 Continuous and uniform application of forcethroughout the duration of the bending operation,9.2.2.2 Unrestricted movement of the specimen at points ofcontact with the apparatus and bending around a pin free torotate,9.2.2.3 Close wrapping of the specimen around the pinduring the bending operation.9.3 Test Specimens:9.3.1 The tension test specimens shall be the full section ofthe bar as rolled. The unit stress determination shall be basedon the
