ABS AQ DQ EQ 70
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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.
ApplicationsTypical applications for ABS AQ/DQ/EQ 70 grades include shipbuilding and mobile offshore drilling units and structures.
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 |
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:
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 |
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.
Grade | Test temperature(°F) | Min Longitudinal Average Energy 2)(ft-lbs) |
---|---|---|
AQ 70 1) | 32 | 51 |
DQ 70 | -4 | 51 |
EQ 70 | -40 | 51 |
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.
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) |
1) 0.008% maximum S for Z-Quality plates.
2) Elements will be reported.
Thickness (inmm) | 0.188 - 1.504.78 - 38.1 |
---|---|
Typical Ceq (wt %) | 0.47 |
Ceq and Pcm typical values are based on historical averages.
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.