ASTM A709 / A709M - 17

    Standard Specification for Structural Steel for Bridges

    Active Standard ASTM A709 / A709M | Developed by Subcommittee: A01.02

    Book of Standards Volume: 01.04


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    Abstract

    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. Heat analysis shall be used to determine the percentage of carbon, manganese, phosphorus, sulfur, silicon, and copper for the required chemical composition. A tension test shall be used to determine the required tensile properties such as tensile strength, yield strength, and elongation. Materials shall undergo: (1) an impact test for non-fracture critical and fracture critical members; and (2) a Brinell hardness test for Grades 100 and 100W. Atmospheric corrosion resistance shall also be determined.

    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 This specification covers carbon and high-strength low-alloy steel structural shapes, plates, and bars, quenched and tempered alloy steel, and stainless steel for structural plates intended for use in bridges. Eight 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]    

          50CR [345CR]

     50 [345]    

          HPS 70W [HPS 485W]

     70 [485]    

          HPS 100W [HPS 690W]

    100 [690]    

    1.1.1 Grades 36 [250], 50 [345], 50S [345S], 50W [345W], and 50CR [345CR] are also included in Specifications A36/A36M, A572/A572M, A992/A992M, A588/A588M, and A1010/A1010M (UNS S41003), respectively. When the requirements of Table 10 or Table 11 or the supplementary requirements of this specification are specified, they exceed the requirements of Specifications A36/A36M, A572/A572M, A992/A992M, A588/A588M, and A1010/A1010M (UNS S41003). Product availability is shown in Table 1.

    TABLE 1 Tensile and Hardness RequirementsA

    Note 1: Where “. . .” 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, %

    Reduction of AreaC,Dmin, %

    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]H,I

    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

    ...

     

     

     

     

     

     

     

     

     

     

    50CR [345CR]

    to 2 [50], incl

    G

    50 [345] min

    70 [485] min

    18

    21

    ...

    ...

    ...

     

     

     

     

     

     

     

     

     

     

    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 11).

    1.1.2 Grades 50W [345W], 50CR [345CR], 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 2 Grade 36 [250] Chemical Requirements (Heat Analysis)

    Note 1: Where “. . .” 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

    Plates >15 in. [380 mm] WidthB

    Bars, Plates 15 in. [380 mm] WidthB

    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 [40 to 100], incl

    Carbon, max, %

    0.26

    0.25

    0.25

    0.26

    0.27

    0.26

    0.27

    0.28

    Manganese, %

    ...

    ...

    0.80–1.20

    0.80–1.20

    0.85–1.20

    ...

    0.60–0.90

    0.60–0.90

    Phosphorus, max, %

    0.04

    0.030

    0.030

    0.030

    0.030

    0.04

    0.04

    0.04

    Sulfur, max, %

    0.05

    0.030

    0.030

    0.030

    0.030

    0.05

    0.05

    0.05

    Silicon, %

    0.40 max

    0.40 max

    0.40 max

    0.15–0.40

    0.15–0.40

    0.40 max

    0.40 max

    0.40 max

    Copper, min, % when copper steel is specified

    0.20

    0.20

    0.20

    0.20

    0.20

    0.20

    0.20

    0.20

    (A) Manganese content of 0.85 to 1.35 % and silicon content of 0.15 to 0.40 % is required for shapes with flange thickness over 3 in. [75 mm].
    (B) For each reduction of 0.01 % below the specified carbon maximum, an increase of 0.06 % manganese above the specified maximum will be permitted up to a maximum of 1.35 %.

    TABLE 3 Grade 50 [345] Chemical RequirementsA (Heat Analysis)

    Maximum Diameter, Thickness, or Distance Between Parallel Faces,
    in. [mm]

    Carbon,
    max, %

    Manganese,B
    max, %

    Phosphorus,C
    max, %

    Phosphorus,C
    max, %

    SiliconD

    Columbium (Niobium),E
    Vanadium,
    and Nitrogen

    Plates to 11/2-in. [40-mm] Thick, Shapes with flange or leg thickness to 3 in. [75 mm] inclusive, Sheet Piling, Bars, Zees, and Rolled Tees, max, %

    Plates Over 11/2-in. [40-mm] Thick and Shapes with flange thickness over 3 in. [75 mm], %

    4 [100]

    0.23

    1.35

    0.030

    0.030

    0.40

    0.15–0.40

    See Table 4

    (A) Copper when specified shall have a minimum content of 0.20 % by heat analysis (0.18 % by product analysis).
    (B) Manganese, minimum by heat analysis of 0.80 % (0.75 % by product analysis) shall be required for all plates over 3/8 in. [10 mm] in thickness; a minimum of 0.50 % (0.45 % by product analysis) shall be required for plates 3/8 in. [10 mm] and less in thickness, and for all other products. The manganese to carbon ratio shall not be less than 2 to 1. For each reduction of 0.01 percentage point below the specified carbon maximum, an increase of 0.06 percentage point manganese above the specified maximum is permitted, up to a maximum of 1.60 %.
    (C) A maximum phosphorus content of 0.04 % and a maximum sulfur content of 0.05 % are permitted for the following materials:

    · Structural shapes

    · Bars

    · Plates with widths up to and including 15 in. [380 mm]

    (D) Silicon content in excess of 0.40 % by heat analysis must be negotiated.
    (E) Columbium and niobium are interchangeable names for the same element.

    TABLE 4 Grade 50 [345] Alloy Content

    TypeA

    Elements

    Heat Analysis, %

    1

    Columbium (niobium)B

    0.005–0.05C

     

     

     

    2

    Vanadium

    0.01–0.15D

     


    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
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/A0709_A0709M-17

    Citation Format

    ASTM A709 / A709M-17, Standard Specification for Structural Steel for Bridges, ASTM International, West Conshohocken, PA, 2017, www.astm.org

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