ASTM A709 Grade HPS 70W

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    General Product Description

    The ASTM A709 is the Standard Specification for Structural Steel for Bridges and encompasses carbon, high-strength low-alloy, and quenched and tempered alloy steels used as structural plates in the construction of bridges. Of the five grades SSAB offers, three grades have an ASTM G101 enhanced Atmospheric Corrosion Resistance Index of ≥6.0.

    Available Dimensions

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      Grade Thickness
      (inchesmm)
      Width
      (inchesmm)
      Length
      (inchesmm)
      HPS 70W 0.750 - 1.24919.0 - 31.72 72 - 1201800 - 3050 240 - 11766100 - 29870
      HPS 70W 1.25 - 2.0031.8 - 50.8 72 - 1201800 - 3050 240 - 11046100 - 28040
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        Width: Please inquire for plate widths less than 72 in. and over 120 in. Please inquire for plate lengths greater than 1020 in.

        Length: Plate length may be limited by maximum individual plate weight of 66,000 lbs.

        Thickness: Please inquire for thicknesses greater than 2.00 in.

        Mechanical Properties

        Tensile testing is performed in the transverse direction according to ASTM A370 requirements.

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          Grade Thickness
          (inchesmm)
          Yield strength 1)
          (min ksi)
          Tensile strength
          (min ksi)
          Elongation in 2" 2)
          (min %)
          HPS 70W 0.750 - 2.0019.0 - 50.8 70 85 19
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            1) Yield strength measured as 0.2% offset or 0.5% extension under load.

            2) For plates wider than 24 in, the elongation requirement is reduced by two percentage points. See elongation requirement adjustments in the Tension Test section of Specification ASTM A6.

            Impact Properties

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              Grade Thickness
              (inchesmm)
              Min Longitudinal Average Energy 1)
              (ft-lbs)
              Min Longitudinal Individual Value 1)
              (ft-lbs)
              Zone 1 Test Temp Zone 2 Test Temp Zone 3 Test Temp
              HPS 70WT 0.750 - 2.00019.0 - 50.80 25 10 oF 10 oF 10 oF
              HPS 70WF 0.750 - 2.00019.0 - 50.80 35 28 10 oF 10 oF 10 oF
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                1) CVN impact testing in accordance with ASTM A673.
                Please inquire for orders requiring CVN impact testing.

                Chemical Composition

                (Heat Analysis, wt. %, maximum unless noted)
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                  Type Thickness (inchesmm) C
                  (max wt %)
                  Mn
                  (wt %)
                  P
                  (max wt %)
                  S
                  (max wt %)
                  Si
                  (wt %)
                  Altot
                  (wt %)
                  V
                  (wt %)
                  Cr
                  (wt %)
                  Ni
                  (max wt %)
                  Mo
                  (wt %)
                  Cu
                  (wt %)
                  HPS 70W 0.750 - 2.0019.0 - 50.8 0.11 1.10 - 1.35 0.020 0.006 0.30 - 0.50 0.010 - 0.040 0.04 - 0.08 0.45 - 0.70 0.40 0.02 - 0.08 0.25 - 0.40
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                    Sulfur: The steel shall be calcium treated for sulfide shape control.

                    Steel made to fine grain practice.

                    Tolerances

                    Thickness, width, and length tolerances are in accordance with ASTM A6 requirements. The flatness tolerance for as-supplied product is halfstandard ASTM A6 tolerance.

                    Fabrication and Other Recommendations

                    Please contact SSAB for technical support for welding, thermal cutting, and forming assistance, if needed.

                    Supplementary Requirements

                    Please see the ASTM A709 standard for supplementary requirements considered suitable for use with this specification.

                    Please inquire for orders requiring supplementary requirements.

                    Contact Information

                    www.ssab.com/contact