ABS AQ DQ EQ 70

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    General Product Description

    ABS AQ/DQ/EQ 70 are American Bureau of Shipping grades of high-strength, quenched and tempered steel plates for structural applications requiring high yield strength combined with good formability and toughness. ABS AQ/DQ/EQ 70 grades have minimum yield strengths of 100 ksi [690 MPa, 70 kgf/mm2] and the different alphabetic indicators AQ, DQ, and EQ identifythe respective Charpy V-notch impact test temperature.

    Applications

    Typical applications for ABS AQ/DQ/EQ 70 grades include shipbuilding and mobile offshore drilling units and structures.

    Available Dimensions

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      Grade Product type Thickness
      (inchesmm)
      Width
      (inchesmm)
      Length
      (inchesmm)
      AQ/DQ/EQ 70 Plate 0.188 - 1.504.78 - 38.1 72 - 1201800 - 3050 240 - 5886100 - 14900
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        Thickness: Inquire for thicknesses less than 1 inch and for thicknesses greater than 1.5 inches up to 5.1 inches.

        Width: Inquire for widths less than 72 inches and for widths greater than 120 inches up to 131.9 inches.

        Length: Inquire for lengths greater than 588 inches up to 600 inches.

        Mechanical Properties

        Tensile testing is performed in the transverse direction. The required tensile properties are tabulated below:

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          Yield strength
          (min ksi)
          Tensile strength
          (ksi)
          Elongation A5
          (min %)
          Reduction of area, average 1)
          (min %)
          Reduction of area 2)
          (min %)
          100 112 - 136 14 25 15
          100 112 - 136 14 35 25
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            1) Minimum Average Reduction in Area when Z25 or Z35 Quality Specified.

            2) Minimum Individual Value Reduction of Area when Z25 or Z35 Quality Specified.

            Through-Thickness Tension Testing, “Z” Quality

            When “Z” quality steel is specified, through-thickness tension testing is performed in accordance with ABS Rules and ASTM A770. Two “Z” quality steels are available, Z25 and Z35. The through-thickness tension testing reduction of area requirements for each are tabulated in the table.

            Impact Properties

            Charpy V-notch impact testing is performed with longitudinal test specimens. Please inquire if transverse Charpy V- notch specimen testing is required.

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              Grade Test temperature
              (°F)
              Min Longitudinal Average Energy 2)
              (ft-lbs)
              AQ 70 1) 32 51
              DQ 70 -4 51
              EQ 70 -40 51
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                1) Charpy V-notch impact testing of AQ70 is not required unless explicitly ordered.

                2) Minimum average energy for full-size specimens. Refer to ABS Rules for sub-size specimen energy requirements.

                Chemical Composition

                (wt. % maximum, ladle analysis)
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                  Grade C
                  (max %)
                  Mn
                  (max %)
                  P
                  (max %)
                  S 1)
                  (max %)
                  Si
                  (max %)
                  N
                  (max %)
                  Cu
                  (max %)
                  Ni
                  (max %)
                  Cr
                  (max %)
                  Mo
                  (max %)
                  Nb
                  (max %)
                  V
                  (max %)
                  Ti
                  (max %)
                  Zr
                  (max %)
                  B
                  (max %)
                  AQ/DQ 70 0.18 1.70 0.025 0.015 0.80 0.015 2) 2) 2) 2) 2) 2) 2) 2) 2)
                  EQ 70 0.18 1.70 0.020 0.010 0.80 0.015 2) 2) 2) 2) 2) 2) 2) 2) 2)
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                    1) 0.008% maximum S for Z-Quality plates.

                    2) Elements will be reported.

                    Carbon Equivalent CET(CEV)

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                      Thickness (inchesmm) 0.188 - 1.504.78 - 38.1
                      Typical Ceq (wt %) 0.47
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                        Thickness (inchesmm)
                        Typical Ceq (wt %)
                        0.188 - 1.504.78 - 38.1
                        0.47

                        Ceq and Pcm typical values are based on historical averages.

                        Tolerances

                        Thickness tolerances for ABS AQ/DQ/EQ70 steel plates are in accordance with the requirements of ABS Rules 2-1-1/15.

                        Length and width tolerances for ABS AQ/DQ/EQ70 steel plates are in accordance with ASTM A6.