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.
ApplicationsTypical 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 (in) |
Width (in) |
Length (in) |
|---|---|---|---|---|
| AQ/DQ/EQ 70 | Plate | 0.188 - 1.50 | 72 - 120 | 240 - 588 |
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Grade
AQ/DQ/EQ 70
Product type
Plate
Thickness
(in)
(in)
0.188 - 1.50
Width
(in)
(in)
72 - 120
Length
(in)
(in)
240 - 588
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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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Comparison
Yield strength
(min ksi)
(min ksi)
100
Tensile strength
(ksi)
(ksi)
112 - 136
Elongation A5
(min %)
(min %)
14
Reduction of area, average 1)
(min %)
(min %)
25
Reduction of area 2)
(min %)
(min %)
15
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Yield strength
(min ksi)
(min ksi)
100
Tensile strength
(ksi)
(ksi)
112 - 136
Elongation A5
(min %)
(min %)
14
Reduction of area, average 1)
(min %)
(min %)
35
Reduction of area 2)
(min %)
(min %)
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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Grade
AQ 70 1)
Test temperature(°F)
32
Min Longitudinal Average Energy 2)(ft-lbs)
51
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Grade
DQ 70
Test temperature(°F)
-4
Min Longitudinal Average Energy 2)(ft-lbs)
51
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Grade
EQ 70
Test temperature(°F)
-40
Min Longitudinal Average Energy 2)(ft-lbs)
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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Grade
AQ/DQ 70
C
(max %)
(max %)
0.18
Mn
(max %)
(max %)
1.70
P
(max %)
(max %)
0.025
S 1)
(max %)
(max %)
0.015
Si
(max %)
(max %)
0.80
N
(max %)
(max %)
0.015
Cu
(max %)
(max %)
2)
Ni
(max %)
(max %)
2)
Cr
(max %)
(max %)
2)
Mo
(max %)
(max %)
2)
Nb
(max %)
(max %)
2)
V
(max %)
(max %)
2)
Ti
(max %)
(max %)
2)
Zr
(max %)
(max %)
2)
B
(max %)
(max %)
2)
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Grade
EQ 70
C
(max %)
(max %)
0.18
Mn
(max %)
(max %)
1.70
P
(max %)
(max %)
0.020
S 1)
(max %)
(max %)
0.010
Si
(max %)
(max %)
0.80
N
(max %)
(max %)
0.015
Cu
(max %)
(max %)
2)
Ni
(max %)
(max %)
2)
Cr
(max %)
(max %)
2)
Mo
(max %)
(max %)
2)
Nb
(max %)
(max %)
2)
V
(max %)
(max %)
2)
Ti
(max %)
(max %)
2)
Zr
(max %)
(max %)
2)
B
(max %)
(max %)
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 (in) | 0.188 - 1.50 |
|---|---|
| Typical Ceq (wt %) | 0.47 |
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Thickness (in)
Typical Ceq (wt %)
0.188 - 1.50
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.