Hull structural steel can be divided into ordinary strength steel, higher strength steel and extra high tensile strength steel. The ordinary strength hull structural steel of China Classification Society has four quality grades: Grades A, B, D and E (ie CCS A, CCS B, CCS C, CCS D). The higher strength steel of China Classification Society standard is three Strength levels (32 grades, 36 grades, 40\0grades), four quality classes (Grades AH, DH, EH, FH) as follows:
CCS AH32 |
CCS DH32 |
CCS EH32 |
CCS FH32 |
CCS AH36 |
CCS DH36 |
CCS EH36 |
CCS FH36 |
CCS AH40 |
CCS DH40 |
CCS EH40 |
CCS FH40 |
C max |
Mn |
Si |
P max |
S max |
Al max. |
Cb |
V |
Ti max. |
Cu max. |
Cr max. |
Ni max. |
Mo max. |
0.18 |
0.90-1.60 |
0.10-0.50 |
0.035 |
0.035 |
0.015 |
0.02-0.05 |
0.05-0.10 |
0.02 |
0.35 |
0.20 |
0.40 |
0.08 |
Yield Strength (MPa) min. |
Tensile Strength (MPa) |
Elongation in 8 in. min. % |
Elongation in 2 in. min. % |
355 |
490-620 |
19 |
22 |
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