ABS DQ56 and ABS DQ70 are high-strength, quenched and tempered (Q&T) structural steel plates certified by the American Bureau of Shipping (ABS) for offshore and marine applications. They offer superior yield strength and toughness for demanding offshore structures, with "DQ" likely indicating quenched and tempered processing for specialized structural use.
Key Details on ABS DQ56 & DQ70
Grade Breakdown: The numbers 56 and 70 correspond to their minimum yield strength, likely 560 MPa and 700 MPa respectively, classifying them as Extra High Strength steel.
Application: These steels are used in offshore projects, such as jack-up rigs and oil platforms, that require high strength and toughness.
Processing: They are supplied in a quenched and tempered (DQ or Q&T) condition, which improves the microstructure for better durability.
Chemical Composition
|
ABS DQ56 Extra high Strength Chemical Composition in Tempering and Quenching |
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|
Grade |
The Element Max (%) |
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|
C |
Si |
Mn |
P |
S |
N |
|
|
ABS DQ56 |
0.20 |
0.55 |
1.7 |
0.030 |
0.030 |
0.02 |
|
ABS DQ70 Extra high Strength Chemical Composition in Tempering and Quenching |
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|
Grade |
The Element Max (%) |
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|
C |
Si |
Mn |
P |
S |
N |
|
|
ABS DQ70 |
0.20 |
0.55 |
1.7 |
0.030 |
0.030 |
0.02 |
Mechanical Property
|
ABS DQ56 Extra high strength property in tempering and quenching |
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|
Grade |
Mechanical Property |
Charpy V Impact Test |
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|
Yield |
Tensile |
Elongation |
Degree |
Energy 1 |
Energy 2 |
|
|
Min Mpa |
Mpa |
Min % |
-20 |
J |
J |
|
|
ABS DQ56 |
550 |
670-835 |
16 |
37 |
55 |
|
|
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal |
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|
ABS DQ70 Extra high strength property in tempering and quenching |
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|
Grade |
Mechanical Property |
Charpy V Impact Test |
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|
Yield |
Tensile |
Elongation |
Degree |
Energy 1 |
Energy 2 |
|
|
Min Mpa |
Mpa |
Min % |
-20 |
J |
J |
|
|
ABS DQ70 |
690 |
770-940 |
14 |
41 |
62 |
|
|
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal |
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