ABS AQ/DQ/EQ63 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/EQ63 grades have minimum yield strengths of 90 ksi [620 MPa, 63 kgf/mm2] and the different alphabetic indicators AQ, DQ, and EQ identifythe respective Charpy V-notch impact test temperature.
ApplicationsTypical applications for ABS AQ/DQ/EQ63 grades include shipbuilding and mobile offshore drilling units and structures.
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.
Tensile testing is performed in the transverse direction. The required tensile properties are tabulated below:
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.
Charpy V-notch impact testing is performed with longitudinal test specimens. Please inquire if transverse Charpy V- notch specimen testing is required.
1) Charpy V-notch impact testing of AQ63 is not required unless explicitly ordered.
2) Minimum average energy for full-size specimens. Refer to ABS Rules for sub-size specimen energy requirements.
1) 0.008% maximum S for Z-Quality plates.
2) Elements will be reported.
Ceq and Pcm typical values are based on historical averages.
Thickness tolerances for ABS AQ/DQ/EQ63 steel plates are in accordance with the requirements of ABS Rules 2-1-1/15.
Length and width tolerances for ABS AQ/DQ/EQ63 steel plates are in accordance with ASTM A6.
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