CCS 420 is a structural steel for ships and marine engineering, divided into four quality grades: A, D, E, and F, namely CCS AH420, CCS DH420, CCS EH420, CCS FH420. H is a high-strength building material, and 420 is the lower yield strength.
AH420 shipbuilding steel plate executive standard: GB711-2011
This standard is used in the manufacture of CCS AH420 steel plates with a thickness of not more than 150mm for navigating ships, fishing boats and marine engineering structures in ocean, coastal and inland waterways.
Grades |
C |
Si |
Mn |
P |
S |
N |
|
AH420 |
≤0.21 |
≤0.55 |
≤1.70 |
≤0.030 |
≤0.030 |
≤0.020 |
|
DH420 |
≤0.20 |
≤0.55 |
≤1.70 |
≤0.025 |
≤0.025 |
≤0.020 |
|
EH420 |
≤0.20 |
≤0.55 |
≤1.70 |
≤0.025 |
≤0.025 |
≤0.020 |
|
FH420 |
≤0.18 |
≤0.55 |
≤1.60 |
≤0.020 |
≤0.020 |
≤0.020 |
CCS AH420，CCS DH420，CCS EH420，CCS FH420 mechanical properties
Grades |
Tensile strength |
V impact test |
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|
Yield strength Mpa |
Tensile strength Mpa |
Elongation % |
Test temperature℃ |
Impact absorption energy J |
||
|
Vertical |
Horizontal |
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|
Min |
||||||
|
AH420 |
≥420 |
530-680 |
18 |
0 |
42 |
28 |
|
DH420 |
-20 |
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|
EH420 |
-40 |
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|
FH420 |
-60 |
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CCS AH420 steel plate flaw detection
A and Z-direction steel plates shall be subjected to ultrasonic flaw detection, and the flaw detection level shall be indicated in the contract.
B. According to the requirements of the buyer and the agreement between the supplier and the buyer, other steel plates can also be subjected to non-destructive inspection.
The practical application of CCS AH420 shipbuilding steel
CCS AH420 shipbuilding steel plate is a structural steel with high strength and high strength for hull. Shipbuilding steel generally refers to the steel used for hull structure, which refers to the steel used to make the hull structure produced in accordance with the requirements of the classification society.
