BV D420 and BV E420 are both high-strength shipbuilding steel plates designated by Bureau Veritas (BV), featuring a minimum yield strength of 420 MPa. The primary difference lies in their impact toughness: BV D420 is tested at -20° C, while BV E420 is tested at a more rigorous -40° C.
Chemical Composition
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BV D420 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 D420 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.015 |
0.020 |
|
BV E420 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 E420 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.015 |
0.020 |
Mechanical properties
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BV D420 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 D420 |
Min Mpa |
Mpa |
Min % |
-20 |
J |
J |
|
420 |
530-680 |
18% |
28 |
42 |
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|
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal |
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|
BV E420 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 E420 |
Min Mpa |
Mpa |
Min % |
-40 |
J |
J |
|
420 |
530-680 |
18% |
28 |
42 |
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|
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal |
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Key Differences:
Impact Toughness (Charpy V-Notch):
BV D420: Guaranteed impact energy at -20° C.
BV E420: Guaranteed impact energy at -40° C.
Application:
BV E420 is used in colder environments or more critical structural areas requiring better low-temperature performance compared to D420.
Standardization: Both are high-strength quenching and tempering (or Thermo-Mechanical Control Process - TMCP) steel plates designed for hull structures.
