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
    (inmm)
    Width
    (inmm)
    Length
    (inmm)
    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 ksiMPa)
        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

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