ASTM A709/A709M-09a

    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 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.

    1.2 Grade HPS 70W [HPS 485W] or HPS 100W [HPS 690W] shall not be substituted for Grades 36 [250], 50 [345], 50S [345S], 50W [345W], or HPS 50W [HPS 345W]. Grade 50W [345W], or HPS 50W [HPS 345W] shall not be substituted for Grades 36 [250], 50 [345] or 50S [345S] without agreement between the purchaser and the supplier.

    1.3 When the steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended use or service will be utilized. See Appendix X3 of Specification A6/A6M for information on weldability.

    1.4 For structural products to be used as tension components requiring notch toughness testing, standardized requirements are provided in this standard, and they are based upon American Association of State Highway and Transportation Officials (AASHTO) requirements for both fracture critical and non-fracture critical members.

    1.5 Supplementary requirements are available but shall apply only if specified in the purchase order.

    1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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 the standard.

    1.7 For structural products produced from coil and furnished without heat treatment or with stress relieving only, the additional requirements, including additional testing requirements and the reporting of additional test results, of Specification A6/A6M apply.

    TABLE 1 Tensile and Hardness RequirementsA

    Note—Where . . . appears in this table, there is no requirement.

    Plate Thickness,
    in. [mm]
    Structural Shape Flange
    or Leg
    Thickness, in. [mm]
    Yield Point
    or Yield
    ksi [MPa]
    Minimum Elongation, %
    tion of
    min, %
    Plates and BarsC,E
    8 in.
    or 200
    2 in.
    or 50
    8 in.
    or 200
    2 in.
    or 50
    36 [250]
    to 4 [100], incl
    to 3 in. [75 mm], incl
    36 [250] min
    5880 [400550]

    over 3 in. [75 mm]
    36 [250] min
    58 [400] min
    50 [345]
    to 4 [100], incl
    50 [345] min
    65 [450] min
    50S [345S]G
    all 5065
    65 [450]H min ...
    ... 18
    50W [345W] and
    HPS 50W
    [HPS 345W]

    to 4 [100], incl
    50 [345] min
    70 [485] min
    HPS 70W
    [HPS 485 W]

    to 4 [100], incl G 70 [485] minB 85110 [585760] ...
    19K ...
    HPS 100W
    [HPS 690W]
    to 2½ [65], incl
    100 [690] minB
    110130 [760895]
    over 2½ to 4
    [65 to 100], inclM
    90 [620] minB
    100130 [690895]

    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) 1½-in. [40mm] 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) 1½-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).

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

    ASTM Standards

    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

    A1010/A1010M Specification for Higher-Strength Martensitic Stainless Steel Plate, Sheet, and Strip

    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
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    DOI: 10.1520/A0709_A0709M-09A

    Citation Format

    ASTM A709 / A709M-09a, Standard Specification for Structural Steel for Bridges, ASTM International, West Conshohocken, PA, 2009,

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