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

Grade
Grade
AQ/DQ/EQ 70
Product type
Plate
Thickness
(inmm)
0.188 - 1.504.78 - 38.1
Width
(inmm)
72 - 1201800 - 3050
Length
(inmm)
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.

Mechanical Properties

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

Yield strength
(min ksiMPa)
Yield strength
(min ksiMPa)
100
Tensile strength
(ksi)
112 - 136
Elongation A5
(min %)
14
Reduction of area, average 1)
(min %)
25
Reduction of area 2)
(min %)
15
Yield strength
(min ksiMPa)
Yield strength
(min ksiMPa)
100
Tensile strength
(ksi)
112 - 136
Elongation A5
(min %)
14
Reduction of area, average 1)
(min %)
35
Reduction of area 2)
(min %)
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.

Impact Properties

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

Grade
Grade
AQ 70 1)
Test temperature
(°F)
32
Min Longitudinal Average Energy 2)
(ft-lbs)
51
Grade
Grade
DQ 70
Test temperature
(°F)
-4
Min Longitudinal Average Energy 2)
(ft-lbs)
51
Grade
Grade
EQ 70
Test temperature
(°F)
-40
Min Longitudinal Average Energy 2)
(ft-lbs)
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.

Chemical Composition

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

1) 0.008% maximum S for Z-Quality plates.

2) Elements will be reported.

Carbon Equivalent

Thickness (inmm)
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.

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