LR Grade DH50 is a high-strength, normalized or thermo-mechanically controlled processed steel plate certified by Lloyd's Register (LR). The "D" designation indicates it is a Grade D steel, which provides good impact toughness at low temperatures, while the "H50" signifies a minimum yield strength of 355 MPa. This steel offers an excellent balance of high strength, good toughness, and weldability, making it a robust and cost-effective choice for major ship structures and certain offshore applications.
Chemical Composition
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LR DH50 extra high Strength Chemical Composition |
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Grade |
The Element Max (%) |
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|
C |
Si |
Mn |
P |
S |
Al |
N |
|
|
LR DH50 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.015 |
0.020 |
|
Nb |
V |
Ti |
Cu |
Cr |
Ni |
Mo |
|
|
0.02-0.05 |
0.03-0.10 |
0.02 |
|
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|
|
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Mechanical Property
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LR DH50 extra high strength property |
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Grade |
|
Mechanical Property |
Charpy V Impact Test |
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Thickness |
Yield |
Tensile |
Elongation |
Degree |
Energy 1 |
Energy 2 |
|
|
LR DH50 |
mm |
Min Mpa |
Mpa |
Min % |
-20 |
J |
J |
|
t≤50 |
500 |
610-770 |
18% |
33 |
50 |
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50＜t≤70 |
500 |
610-770 |
18% |
33 |
50 |
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70＜t≤100 |
500 |
610-770 |
18% |
33 |
50 |
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Note: Energy 1 is transverse impact test, Energy 2 is longitudinal |
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Application
LR Grade DH50 Shipbuilding steel plate is mainly used to Shipbuilding Project and Ocean Offshore Structural Project.
LR Grade DH50 Shipbuilding Steel Plate Other Name
LR Grade DH50 Shipbuilding steel plate,
LR Grade DH50 Ship steel plate,
LR Grade DH50 Marine steel plate,
LR Grade DH50 steel plate .
Additional Condition
UT(Ultrasonic examination), AR(As Hot Rolled only), TMCP(Thermal Mechanical Control Processing), N(Normalized), Q+T(Quenched and Tempered),Z Direction Test(Z15,Z25,Z35), Charpy V-Notch Impact Test, The Third Party Test (such as SGS Test), Coated or Shot Blasting and Painting.
