BV D550 and BV E550 are both high-strength marine-grade steel plates certified by Bureau Veritas (BV) with a minimum yield strength of 550 MPa, intended for shipbuilding and offshore structures. The primary difference lies in their impact toughness requirements: BV E550 has superior notch toughness, ensuring structural integrity at lower temperatures (tested at -40°C), while BV D550 is tested for toughness at -20°C.
Chemical Composition
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BV D550 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 D550 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.015 |
0.020 |
|
BV E550 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 E550 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.015 |
0.020 |
Mechanical properties
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BV D550 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 D550 |
Min Mpa |
Mpa |
Min % |
-20 |
J |
J |
|
550 |
670-830 |
16% |
37 |
55 |
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|
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal |
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|
BV E550 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 E550 |
Min Mpa |
Mpa |
Min % |
-40 |
J |
J |
|
550 |
670-830 |
16% |
37 |
55 |
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|
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal |
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Key Differences
Impact Toughness:
BV D550: Tested to demonstrate impact toughness at -20°C.
BV E550: Tested to demonstrate superior impact toughness at -40°C.
Applications:
BV D550: Suitable for structural members in cold-water environments.
BV E550: Preferred for extremely cold regions (Arctic conditions) or critical applications requiring higher fracture resistance.
