1.CCS in China, ABS in the United States, GL in Germany, BV in France, DNV in Norway, KDK in Japan, LR in the United Kingdom...
According to the minimum yield point, hull structural steels are divided into general strength structural steels and high strength structural steels.
The general strength structural steels in China Classification Society Standards are classified into four quality grades: A, B, D and E. The high strength structural steels in China Classification Society Standards are classified into three strength grades and four quality grades.
A32 A36 A40
D32 D36 D40
E32 E36 E40
F32 F36 F40

2. chemical composition
C, Mn, Mn, Si, S, P
A 235 400-520 22 < 0.21 < 2.5 < 0.5 < 0.035 < 0.035
B < 0.21 < 0.80 < 0.35
D < 0.21 < 0.60 < 0.35
E < 0.18 < 0.70 < 0.35
Mechanical Properties and Chemical Composition of High Strength Hull Structural Steel
C, Mn, Mn, Si, S, P
A32 315 440-570 22 < 0.18 < 0.9-1.60 < 0.50 < 0.035 < 0.035
D32 E32 F32 < 0.16 < 0.025 < 0.025
A36 355 490-630 21 < 0.18 < 0.035 < 0.035
D36 E36 F36 < 0.16 < 0.025 < 0.025
A40 390 510-660 20 < 0.18 < 0.035 < 0.035
D40 E40 F40 < 0.16 < 0.025 < 0.025