ASTM A706 / A706M - 14

    Standard Specification for Deformed and Plain Low-Alloy Steel Bars for Concrete Reinforcement

    Active Standard ASTM A706 / A706M | Developed by Subcommittee: A01.05

    Book of Standards Volume: 01.04


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    Abstract

    This specification covers deformed and plain low-alloy steel bars in cut lengths or coils for concrete reinforcement intended for applications. Restrictive mechanical properties and chemical composition are required for compatibility with controlled tensile property applications or to enhance weldability. The steel shall be electric-furnace, basic-oxygen, or open-hearth processed. Tension test, bend test, and one set of dimensional property tests including bar weight and spacing, height, and gap of deformations shall be made of each bar size rolled from a heat. All tests and inspection shall be made at the place of manufacture prior to shipment, unless otherwise specified, and shall be conducted so as not to interfere unnecessarily with the operation of the works. A retest shall be provided when the specimen fails to meet the strength and elongation property requirements of the specification.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    1.1 General—This specification covers deformed and plain low-alloy steel bars in cut lengths and coils for concrete reinforcement intended for applications where restrictive mechanical properties and chemical composition are required for compatibility with controlled tensile property applications or to enhance weldability. The standard sizes and dimensions of deformed bars and their number designations are given in Table 1.

    TABLE 1 Deformed Bar Designation Numbers, Nominal Weights [Masses], Nominal Dimensions, and Deformation Requirements

    Bar
    Desig-
    nation
    No.

    Nominal Weight, lb/ft [Nominal Mass, kg/m]

    Nominal DimensionsA

    Deformation Requirements, in. [mm]

    Diameter,
    in. [mm]

    Cross-Sectional Area in. 2 [mm 2]

    Perimeter,
    in. [mm]

    Maximum Average Spacing

    Minimum Average Height

    Maximum Gap (Chord of 12.5 % of Nominal 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 [ 3.6]

     4  [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 [ 4.9]

     5  [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 [ 6.1]

     6  [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 [ 7.3]

     7  [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 [ 8.5]

     8  [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 [ 9.7]

     9  [29]

     3.400 [ 5.060]

    1.128 [28.7]

    1.00 [ 645]

    3.544 [ 90.0]

    0.790 [20.1]

    0.056 [1.42]

    0.431  [10.9]

    10  [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  [12.4]

    11  [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 [13.7]

    14  [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 [16.5]

    18  [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 [21.9]

    A The 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.

    1.2 Grade—Bars are of two minimum yield strength levels: namely, 60 000 psi [420 MPa] and 80 000 psi [550 MPa], designated as Grade 60 [420] and Grade 80 [550], respectively.

    1.3 Plain bars, in sizes up to and including 21/2 in. [63.5 mm] in diameter in coils or cut lengths, when ordered, shall be furnished under this specification. For ductility properties (elongation and bending), test provisions of the nearest smaller nominal diameter deformed bar size shall apply. Requirements providing for deformations and marking shall not be applicable.

    1.4 Controlled Tensile Properties—This specification limits tensile properties (Table 2) to provide the desired yield/tensile properties for controlled tensile property applications.

    TABLE 2 Tensile Requirements

     

    Grade 60 [420]

    Grade 80 [550]

    Tensile strength, min, psi [MPa]

    80 000  [550]A

    100 000 [690]A

    Yield strength, min, psi [MPa]

    60 000  [420]

    80 000 [550]

    Yield strength, max, psi [MPa]

    78 000  [540]

    98 000 [675]

    Elongation in 8 in. [200 mm], min, %

     

     

    Bar Designation Nos.

     

     

     3, 4, 5, 6 [10, 13, 16, 19]

    14

    12

     7, 8, 9, 10, 11 [22, 25, 29, 32, 36]

    12

    12

     14, 18 [43, 57]

    10

    10

    A Tensile strength shall not be less than 1.25 times the actual yield strength.

    1.5 Welding—This specification limits chemical composition (6.2) and carbon equivalent (6.4) to enhance the weldability of the material. When this steel is to be welded, a welding procedure suitable for the chemical composition and intended use or service should be used. The use of the latest edition of AWS D1.4/D1.4M is recommended. The AWS D1.4/D1.4M Welding Code describes the proper selection of the filler metals, preheat/interpass temperatures, as well as, performance and procedure qualification requirements.

    1.6 Requirements for alternate bar sizes are presented in Annex A1. The requirements in Annex A1 only apply when specified by the purchaser (see 4.2.3).

    1.7 The text of this specification references notes and footnotes that provide explanatory material. These notes and footnotes, excluding those in tables, shall not be considered as requirements of this specification.

    1.8 This specification is applicable for orders in either inch-pound units (Specification A706) or in SI units [Specification A706M].

    1.9 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with this specification.

    1.10 This specification does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this specification to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    U.S. Federal Standard

    Fed. Std. No.  Marking for Shipment (Civil Agencies)

    AWS Standard

    AWS D1.4/D1.4M Structural Welding Code--Reinforcing Steel

    ASTM Standards

    A6/A6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling

    A370 Test Methods and Definitions for Mechanical Testing of Steel Products

    A510/A510M Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel, and Alloy Steel

    A615/A615M Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement

    A700 Practices for Packaging, Marking, and Loading Methods for Steel Products for Shipment

    A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

     U.S. Military Standard

    MIL-STD-129 Marking for Shipment and Storage


    ICS Code

    ICS Number Code 77.140.15 (Steels for reinforcement of concrete)

    UNSPSC Code

    UNSPSC Code 30103623(Reinforcing bar or rebar or mesh)


    DOI: 10.1520/A0706_A0706M

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