What grade in other overseas classification societies does CCS Grade B correspond to? Are they interchangeable?

Based on the unified standards of the International Association of Classification Societies (IACS), CCS Grade B is technically equivalent to Grade B ordinary carbon steel in other classification societies. Common equivalent grades include:

ABS Grade B, LR Grade B, DNV Grade B, BV Grade B.

Note: Although the technical standards are identical, whether they can be directly interchanged in actual shipbuilding depends on the classification society supervising the construction. If a newbuild vessel is subject to a single-classification survey by CCS, the use of Grade B plates certified by other classification societies typically requires re-certification or special approval from the surveyor.