ASTM A709/A709M-13

    Standard Specification for Structural Steel for Bridges


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    1. Scope

    1.1 This specification covers carbon and high-strength low-alloy steel structural shapes, plates, and bars and quenched and tempered alloy steel for structural plates intended for use in bridges. Seven grades are available in four yield strength levels as follows:

    Grade U.S. [SI]

    Yield Strength, ksi [MPa]

          36 [250]

     36 [250]    

          50 [345]

     50 [345]    

          50S [345S]

     50 [345]    

          50W [345W]

     50 [345]    

          HPS 50W [HPS 345W]

     50 [345]    

          HPS 70W [HPS 485W]

     70 [485]    

          HPS 100W [HPS 690W]

    100 [690]    


    1.1.1 Grades 36 [250], 50 [345], 50S [345S], and 50W [345W] are also included in Specifications A36/A36M, A572/A572M, A992/A992M, and A588/A588M, respectively. When the requirements of Table 8 or Table 9 or the supplementary requirements of this specification are specified, they exceed the requirements of Specifications A36/A36M, A572/A572M, A992/A992M, and A588/A588M.

    1.1.2 Grades 50W [345W], HPS 50W [HPS 345W], HPS 70W [HPS 485W], and HPS 100W [HPS 690W] have enhanced atmospheric corrosion resistance (see 13.1.2). Product availability is shown in Table 1.

    TABLE 1 Tensile and Hardness RequirementsA
    Note 1Where “. . .” appears in this table, there is no requirement.

    Grade

    Plate Thickness,
    in. [mm]

    Structural Shape Flange
    or Leg
    Thickness, in. [mm]

    Yield Point
    or Yield
    Strength,B
    ksi
    [MPa]

    Tensile
    Strength,
    ksi [MPa]

    Minimum Elongation, %

    Reduc-
    tion of
    AreaC,D
    min, %

    Plates and BarsC,E

    ShapesE

    8 in.
    or 200
    mm

    2 in.
    or 50
    mm

    8 in.
    or 200
    mm

    2 in.
    or 50
    mm

    36 [250]

    to 4 [100], incl

    to 3 in. [75 mm], incl

       36 [250] min

     58–80 [400–550]

     20

     23

     20

     21

     ...


    over 3 in. [75 mm]

       36 [250] min

     58 [400] min

     ...

     ..

     20

     19

     ...

    50 [345]

    to 4 [100], incl

    all

       50 [345] min

     65 [450] min

     18

     21

     18

     21F

     ...

    50S [345S]

    G

    all

     50–65
    [345–450]HI

     65 [450]H min

     ...

    ...

     18

     21

     ...

    50W [345W] and
     HPS 50W
     [HPS 345W]

    to 4 [100], incl

    all

       50 [345] min

     70 [485] min

     18

     21

     18

     21J

     ...

    HPS 70W
     [HPS 485 W]

    to 4 [100], incl

    G

        70 [485] minB

     85–110 [585–760]

     ...

     19K

     ...

     ...

     ...

    HPS 100W
     [HPS 690W]

    to 21/2 [65], incl

    G

     100 [690] minB

     110–130 [760–895]

     ...

     18K

     ...

     ...

    L

     

    over 21/2 to 4
    [65 to 100], inclM

    G

     90 [620] minB

     100–130 [690–895]

     ...

     16K

     ...

     ...

    L

    A See specimen orientation and preparation subsection in the Tension Tests section of Specification A6/A6M.
    B Measured at 0.2 % offset or 0.5 % extension under load as described in Section 13 of Test Methods A370.
    C Elongation and reduction of area not required to be determined for floor plates.
    D For plates wider than 24 in. [600 mm], the reduction of area requirement, where applicable, is reduced by five percentage points.
    E  For plates wider than 24 in. [600 mm], the elongation requirement is reduced by two percentage points. See elongation requirement adjustments in the Tension Tests section of Specification A6/A6M.
    F Elongation in 2 in. or 50 mm: 19 % for shapes with flange thickness over 3 in. [75 mm].
    G Not applicable.
    H The yield to tensile ratio shall be 0.87 or less for shapes that are tested from the web location; for all other shapes, the requirement is 0.85.
    I A maximum yield strength of 70 ksi [480 MPa] is permitted for structural shapes that are required to be tested from the web location.
    J For wide flange shapes with flange thickness over 3 in. [75 mm], elongation in 2 in. or 50 mm of 18 % minimum applies.
    K If measured on the Fig. 3 (Test Methods A370) 11/2-in. [40–mm] wide specimen, the elongation is determined in a 2-in. or 50-mm gage length that includes the fracture and shows the greatest elongation.
    L 40 % minimum applies if measured on the Fig 3 (Test Methods A370) 11/2-in. [40-mm] wide specimen; 50 % minimum applies if measured on the Fig. 4 (Test Methods A370) 1/2-in. [12.5-mm] round specimen.
    M Not applicable to Fracture Critical Tension Components (see Table 9).
    TABLE 2 Grade 36 [250] Chemical Requirements (Heat Analysis)
    Note 1Where “. . .” appears in this table there is no requirement. The heat analysis for manganese shall be determined and reported as described in the Heat Analysis section of Specification A6/A6M.

    Product
    Thickness,
    in. (mm)

    ShapesA
    All

    PlatesB

    BarsB

    To 3/4 
    [20], incl

    Over 3/4 
    to 11/2 [20 to 40], incl

    Over 11/2 to
    21/2 [40 to 65], incl

    Over 21/2 to 4
    [65 to 100],
    incl

    To 3/4 
    [20],
    incl

    Over 3/4 to
    11/2 [20 to
    40], incl

    Over 11/2 to
    4 [100], incl

     

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

    A36/A36M Specification for Carbon Structural Steel

    A370 Test Methods and Definitions for Mechanical Testing of Steel Products

    A572/A572M Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel

    A588/A588M Specification for High-Strength Low-Alloy Structural Steel, up to 50 ksi [345 MPa] Minimum Yield Point, with Atmospheric Corrosion Resistance

    A673/A673M Specification for Sampling Procedure for Impact Testing of Structural Steel

    A992/A992M Specification for Structural Steel Shapes

    G101 Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels


    ICS Code

    ICS Number Code 77.140.10 (Heat-treatable steels)

    UNSPSC Code

    UNSPSC Code 30260000(Structural materials)


    Referencing This Standard

    DOI: 10.1520/A0709_A0709M

    ASTM International is a member of CrossRef.


    Citation Format

    ASTM A709 / A709M-13, Standard Specification for Structural Steel for Bridges, ASTM International, West Conshohocken, PA, 2013, www.astm.org

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