BV D690 and BV E690 are high-strength, quenched and tempered (QT) or thermo-mechanically controlled processed (TMCP) marine structural steels certified by Bureau Veritas for shipbuilding and offshore platforms. They offer a minimum yield strength of 690 MPa, with E690 providing higher low-temperature impact toughness compared to D690 for critical, low-temperature, or heavy-duty marine applications.
Chemical Composition
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BV D690 extra High Strength Chemical Composition Tempering and Quenching |
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Grade |
The Element Max (%) |
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|
C |
Si |
Mn |
P |
S |
Al(min) |
N |
|
|
BV D690 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.015 |
0.020 |
|
BV E690 extra High Strength Chemical Composition Tempering and Quenching |
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|
Grade |
The Element Max (%) |
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|
C |
Si |
Mn |
P |
S |
Al(min) |
N |
|
|
BV E690 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.015 |
0.020 |
Mechanical property
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BV D690 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 |
|
|
BV D690 |
Min Mpa |
Mpa |
Min % |
-20 |
J |
J |
|
690 |
770-940 |
14% |
46 |
69 |
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|
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal |
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|
BV E690 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 |
|
|
BV E690 |
Min Mpa |
Mpa |
Min % |
-40 |
J |
J |
|
690 |
770-940 |
14% |
46 |
69 |
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|
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal |
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Key Characteristics and Applications
BV D690 : High-strength steel intended for ship hulls, decks, and structural components subjected to high-impact loads.
BV E690 : Similar high-strength properties but with enhanced notch toughness at lower temperatures, commonly used in harsh arctic environments or heavily loaded, critical offshore structures.
Performance: Both grades require rigorous impact testing to ensure safety, performance, and compliance with international maritime standards.
Supply Condition: Due to their strength level (above 500 MPa), these grades are typically supplied in Thermo-Mechanically Controlled Processing (TM) or Quenched and Tempered (QT) conditions.
Fabrication: These steels are suitable for specialized welding techniques, such as hybrid laser-arc welding (HLAW), which is necessary for high-strength steel fabrication.
