1、Designation: A 706/A 706M 08Standard Specification forLow-Alloy Steel Deformed and Plain Bars for ConcreteReinforcement1This standard is issued under the fixed designation A 706/A 706M; the number immediately following the designation indicates the yearof original adoption or, in the case of revisio
2、n, 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 specifica
3、tion 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 s
4、tandard 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 specific
5、ation.1.2 GradeBars are of a single minimum yield strengthlevel: namely, 60 000 psi 420 MPa, designated as Grade 60420.1.3 Plain rounds, in sizes up to and including 212 in. 63.5mm in diameter in coils or cut lengths, when ordered, shall befurnished under this specification. For ductility properties
6、(elongation and bending), test provisions of the nearest smallernominal diameter deformed bar size 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 We
7、ldingThis specification limits chemical composi-tion (6.2) and carbon equivalent (6.4) to enhance 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
8、/D1.4M is recommended. This document describesthe proper selection of the filler metals, preheat/interpasstemperatures, as well as, performance and procedure qualifi-cation requirements.1.6 This specification is applicable for orders in eitherinch-pound units (Specification A 706) or in SI units Spe
9、cifi-cation A 706M.1.7 The values stated in either inch-pound units or SI unitsare to be regarded 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 val
10、ues from the two systemsmay result in nonconformance with this specification.2. Referenced Documents2.1 ASTM Standards:2A 6/A 6M Specification for General Requirements forRolled Structural Steel Bars, Plates, Shapes, and SheetPilingA 370 Test Methods and Definitions for Mechanical Testingof Steel Pr
11、oductsA 510 Specification for General Requirements for WireRods and Coarse Round Wire, Carbon SteelA 510M Specification for General Requirements for WireRods and Coarse Round Wire, Carbon Steel (Metric)A 615/A 615M Specification for Deformed and PlainCarbon-Steel Bars for Concrete ReinforcementA 700
12、 Practices for Packaging, Marking, and LoadingMethods for Steel Products for ShipmentA 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel ProductsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 AWS Standard:3AWS D1.4/D1.4M
13、 Structural Welding CodeReinforcingSteel2.3 Government Standard:4MIL-STD-129 Marking for Shipment and Storage1This 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.C
14、urrent edition approved May 1, 2008. Published May 2008. Originallyapproved in 1974. Last previous edition approved in 2006 as A 706/A 706M 06a.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards v
15、olume information, refer to the standards Document Summary page onthe ASTM website.3Available from American Welding Society (AWS), 550 NW LeJeune Rd.,Miami, FL 33126, http:/www.aws.org.4Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA
16、 19111-5098, http:/www.dodssp.daps.mil.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.2.4 U.S. Federal Standard:4Fed. Std. No. 123 Marking for Shipment (Civil Agencie
17、s)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 reinforced concreteand related construction.3.1.3 DiscussionThe surface
18、 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.3.1.4 plain bar, nsteel bar without protrusions.3.1.5 rib, nlongitudin
19、al 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 are notlimited to, the following:4.1.1 Quantity (weight) mass,4.1.
20、2 Name of material (low-alloy steel deformed and plainbars for concrete reinforcement),4.1.3 Size,4.1.4 Cut lengths or coils,4.1.5 Deformed or plain,4.1.6 Packaging (see Section 17), and4.1.7 ASTM designation and year of issue.5. Material and Manufacture5.1 The bars shall be processed from properly
21、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 shall be determinedin accordance with Test Methods A 751. The manufacturershall
22、 make the analysis on test samples taken preferably duringthe pouring of the heat. The percentages of carbon, manganese,phosphorus, sulfur, silicon, copper, nickel, chromium, molyb-denum, and vanadium shall be determined.6.2 The chemical composition as shown by heat analysisshall be limited by the f
23、ollowing:Element max, %CarbonManganese0.301.50Phosphorus 0.035Sulfur 0.045Silicon 0.506.3 Choice and use of alloying elements, combined withcarbon, phosphorus, and sulfur to give the mechanical proper-ties prescribed in Table 2 and Table 3, shall be made by themanufacturer. Elements commonly used in
24、clude manganese,silicon, copper, nickel, chromium, molybdenum, vanadium,columbium, titanium, and zirconium.6.4 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)TABLE 1 Defo
25、rmed Bar Designation Numbers, Nominal Weights Masses, Nominal Dimensions, and Deformation RequirementsBarDesig-nationNo.ANominal Weight, lb/ftNominal Mass,kg/mNominal DimensionsBDeformation Requirements, in. mmDiameter,in. mmCross-Sectional Areain.2mm2Perimeter,in. mmMaximum AverageSpacingMinimum Av
26、erageHeightMaximum 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 0.31 199 1.963 49.9 0.437 11.1 0.028 0.71 0.239 6.16 19 1.5
27、02 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 1.128 28.7 1.00 645 3.544 90.0 0.790 20.1 0.056 1.42 0
28、.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 0.648 16.518 57 13.60 20.24 2.257 57.3 4.00 2581 7.09 1
29、80.1 1.58 40.1 0.102 2.59 0.864 21.9ABar numbers are based on the number of eighths of an inch included in the nominal diameter of the bars bar numbers approximate the number of millimetres of thenominal diameter of the bar.BThe nominal dimensions of a deformed bar are equivalent to those of a plain
30、 round bar having the same weight mass per foot metre as the deformed bar.TABLE 2 Tensile RequirementsTensile strength, min, psi MPa 80 000 550AYield strength, min, psi MPa 60 000 420Yield strength, max, psi MPa 78 000 540Elongation in 8 in. 203.2 mm, min, %Bar Designation Nos.3, 4, 5, 6 10, 13, 16,
31、 19 147, 8, 9, 10, 11 22, 25, 29, 32, 36 1214, 18 43, 57 10ATensile strength shall not be less than 1.25 times the actual yield strength.TABLE 3 Bend Test RequirementsBar Designation No. Pin Diameter for 180 Bend Tests3, 4, 5 10, 13, 16 3dA6, 7, 8 19, 22, 25 4d9, 10, 11 29, 32, 36 6d14, 18 43, 57 8d
32、Ad = nominal diameter of specimen.A 706/A 706M 0826.5 Product (Check) Verification AnalysisAproduct checkanalysis made by the purchaser shall not exceed the followingpercentages:Element max, %CarbonManganese0.33 %1.56 %Phosphorus 0.043 %Sulfur 0.053 %Silicon 0.55 %7. Requirements for Deformations7.1
33、 Deformations shall be spaced along the bar at substan-tially uniform distances. The deformations on opposite sides ofthe bar shall be similar in size, 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
34、line of deformations forms an included angle with the axisof the bar from 45 to 70, inclusive, the deformations shallreverse alternately in direction 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
35、indirection shall not be required.7.3 The average spacing or distance between deformationson each side of the bar shall not exceed710 of the nominaldiameter 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 n
36、ot 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 these ends. The summationof the gaps shall not exceed 25 % of the nominal perimeter ofthe bar. Furthermore, the summation of gaps shall not exceed25 % of
37、 the nominal perimeter of the bar. The nominalperimeter of the bar shall be 3.1416 times the nominaldiameter.7.5 The spacing, height, and gap of deformations shallconform to the requirements prescribed in Table 1.8. Measurements of Deformations8.1 The average spacing of deformations shall be deter-m
38、ined 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-ing point on a deformation after the last included space.Spa
39、cing 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. Determinations shall be based on three measurementsper deformati
40、on, 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 rejection unless it has been clearly established bydeterminatio
41、ns on each lot (see Note 1) 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 deformations on each side of the bar are measured.NOTE 1As used withi
42、n 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 represented by the test specimens,shall conform to the requireme
43、nts 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 Extension under load using an autographic diagrammethod or an extensometer as described in Test Methods andDefinitions A 370. However, the extension under l
44、oad shall be0.0035 in./in. 0.0035 mm/mm (0.35 %).9.1.1.2 By the drop of the beam or halt in the gage of thetesting machine, where the steel tested has a sharp-kneed orwell-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
45、 bend test specimen 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 sample shall be straightened prior to placing it inthe
46、 bend tester.9.2.2 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 ofcontac
47、t 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 nominal
48、bar area.9.3.2 The bend test specimens shall be the full section of thebar as rolled.9.3.3 When material is furnished in coils, the test sampleshall be taken from the coil and straightened prior to placing itin the jaws of the tensile machine. Straightening of the testsample shall be done carefully
49、to avoid formation of localsharp bends and to minimize cold work. (See Note 2.)9.3.3.1 Test samples taken from post-fabricated materialshall not be used to determine conformance to this specifica-tion.NOTE 2Insufficient straightening prior to attaching the extensometercan result in lower-than-actual
