What are difference between ABS B and CCS B steel plate？

ABS D and CCS D are both normal-strength steel plates specifically designed for shipbuilding and marine applications. They are certified by two different classification societies-ABS (American Bureau of Shipping) and CCS (China Classification Society)-but are technically equivalent in terms of mechanical properties and chemical composition.

ABS Grade D is certified by the American Bureau of Shipping and is defined as a normal-strength structural steel used in shipbuilding . It has a minimum yield strength of 235 MPa and a tensile strength range of 400-520 MPa . The key characteristic of Grade D is its impact test temperature of -20°C, requiring minimum Charpy V-Notch impact energy of 27J . This improved low-temperature toughness compared to Grades A and B makes it suitable for moderate service conditions .

CCS Grade D is certified by the China Classification Society and serves as the direct equivalent to ABS D in the Chinese classification system . It shares identical mechanical property requirements: minimum yield strength of 235 MPa, tensile strength of 400-520 MPa, and minimum elongation of 22% . Like its ABS counterpart, CCS D requires impact testing at -20°C with a minimum of 27J.

Key Differences:
The primary distinction between these two grades lies in their certifying authority and the corresponding quality control system . ABS D complies with American Bureau of Shipping rules and is recognized internationally, particularly in projects requiring ABS certification . CCS D complies with China Classification Society rules and is typically specified for vessels built in Chinese shipyards or for projects under Chinese classification.

Chemical Composition

Mechanical Property

CCS GRADE D generalstrength property