CCSA (China Classification Society Grade A) and CCSB (China Classification Society Grade B) are two shipbuilding standards developed by the China Classification Society (CCS). Firstly, in terms of strength, CCSA has a higher strength and is usually used for structures with higher strength requirements, such as the load-bearing part of the hull. The strength of CCSB is relatively low and is suitable for structural components that do not require particularly high strength. Secondly, with regard to toughness, CCSA is usually more ductile, able to have a certain plastic deformation capacity under stress concentration, and has a certain ability to absorb impact loads. CCSB, however, is relatively less tough and has a lower capacity for plastic deformation. Finally, the corrosion resistance is similar for CCSA and CCSB, but there may be slight differences. This is because it depends largely on factors such as the composition, treatment and coating of the specific steel plate.

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