CCS Grade D and E are grades of marine structural steel certified by the China Classification Society (CCS), used in shipbuilding and marine structures, with Grade E offering higher strength and better low-temperature toughness than Grade D, differing primarily in mechanical properties and testing requirements, essential for various ship parts and offshore applications.
CCS D Normal Strength Max Chemical Composition in Hot-rolled
|
Element |
CCS D Max % |
Element |
CCS D Max % |
|
C |
0.21 |
Ni |
|
|
Mn |
0.60 |
Mo |
|
|
Si |
0.1-0.35 |
Al |
|
|
S |
0.035 |
Nb |
|
|
P |
0.035 |
V |
|
|
Cu |
|
Ti |
|
|
Cr |
|
N |
|
CCS E Normal Strength Max Chemical Composition in Hot-rolled
|
Element |
CCS E Max % |
Element |
CCS E Max % |
|
C |
0.21 |
Ni |
|
|
Mn |
0.60 |
Mo |
|
|
Si |
0.1-0.35 |
Al |
|
|
S |
0.035 |
Nb |
|
|
P |
0.035 |
V |
|
|
Cu |
|
Ti |
|
|
Cr |
|
N |
|
CCS D Normal strength property in Hot-rolled
|
Grade |
Thickness |
Yield Strength |
Tensile Strength |
Elongation |
Impact Energy |
|
(mm) |
MPa (min) |
MPa |
% (min) |
(KV J) (min) |
|
|
|
|
|
|
-20 degree |
|
|
CCS D |
8-240 |
235 |
400-520 |
22 |
27J |
CCS E Normal strength property in Hot-rolled
|
Grade |
Thickness |
Yield Strength |
Tensile Strength |
Elongation |
Impact Energy |
|
(mm) |
MPa (min) |
MPa |
% (min) |
(KV J) (min) |
|
|
|
|
|
|
-20 degree |
|
|
CCS E |
8-240 |
235 |
400-520 |
22 |
27J |
Key Differences & Characteristics
Certification: Both grades meet CCS standards for marine use, but have distinct properties.
Strength: Grade E steel generally has higher tensile and yield strengths than Grade D.
Toughness: A key difference is impact toughness, especially at low temperatures; Grade E typically requires more stringent low-temperature impact testing.
Applications: Used for hulls, decks, bulkheads, and other structural components in ships, barges, and offshore platforms, with E often used in more demanding areas.
