NK Grade E70 Shipbuilding steel plate is a type of high-strength shipbuilding steel certified by Class NK (Nippon Kaiji Kyokai), a classification society, for use in shipbuilding and offshore projects. It is designed to meet strict specifications for mechanical properties like tensile strength and impact toughness, ensuring its suitability for the demanding conditions of marine environments. The "E" in the designation refers to the impact energy requirement and specific testing conditions, while "70" indicates a minimum yield strength of 690 MPa and a tensile strength between 770-940 MPa.
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NK E70 extraStrength Chemical Composition |
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Grade |
The Element Max (%) |
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C |
Si |
Mn |
P |
S |
B |
N |
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NK E70 |
0.20 |
0.55 |
1.70 |
0.030 |
0.030 |
0.006 |
0.020 |
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Nb |
V |
Ti |
Cu |
Cr |
Ni |
Mo |
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|
- |
0.10 |
- |
0.50 |
1.20 |
- |
0.60 |
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NK E70 extra strength property |
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Grade |
Mechanical Property |
Charpy V Impact Test |
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Yield |
Tensile |
Elongation |
Degree |
Energy 1 |
Energy 2 |
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Min Mpa |
Mpa |
Min % |
-40 |
69 |
46 |
|
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NK E70 |
690 |
770-940 |
14 |
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Note: Energy 1 is transverse impact test, Energy 2 is longitudinal |
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Equivalent steel grade of NK E70 |
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DNV |
GL |
LR |
BV |
CCS |
NK |
KR |
RINA |
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NV E690 |
GL E690 |
LR/EH69 |
BV/E690 |
CCS/E690 |
K E70 |
R E70 |
RI E690 |
NK Grade E70 Shipbuilding Steel Plate Other Name
NK Grade E70 Shipbuilding steel plate,
NK Grade E70 Ship Steel plate ,
NK Grade E70 Marine Steel plate ,
NK Grade E70 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.
