Difference between CCS B and ABS B steel plate

Dec 31, 2025 Leave a message

CCS B and ABS B are normal strength shipbuilding steel plates, certified by the China Classification Society (CCS) and American Bureau of Shipping (ABS) respectively, used for ship hulls, with both grades offering similar mechanical properties (around 34 ksi yield, 58-75 ksi tensile strength) but certified by different classification societies, indicating compliance with specific maritime standards for toughness and weldability in marine environments.

Chemical Composition

Element	CCS B Max %	Element	CCS B Max %
C	0.21	Ni
Mn	0.80	Mo
Si	0.35	Al
S	0.035	Nb
P	0.035	V
Cu		Ti
Cr		N

ABS GRADE B general strength Chemical Composition
Grade	The Element Max (%)
Grade	C	Si	Mn	P	S	N
ABS GRADE B	0.21	0.35	0.80	0.035	0.035	0.02

Mechanical Property

Grade	Thickness	Yield Strength	Tensile Strength	Elongation	Impact Energy
	(mm)	MPa (min)	MPa	% (min)	(KV J) (min)
					0 degree
CCS B	8-240	235	400-520	22	27J

ABS GRADE B high strength property
Grade		Mechanical Property			Charpy V Impact Test
Grade	Thickness	Yield	Tensile	Elongation	Degree	Energy 1	Energy 2
ABS GRADE B	mm	Min Mpa	Mpa	Min %	0	J	J
	t≤50	235	400-520	18%		20	27
	50＜t≤70	235	400-520	18%		24	34
	70＜t≤100	235	400-520	18%		27	41
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal

Key Characteristics:
Application: Primarily for general hull construction and structural components of vessels.
Strength: Common strength steel, suitable for general shipbuilding needs.
Mechanical Properties (Approximate): Yield Strength ~34 ksi (235 MPa), Tensile Strength ~58-75 ksi (400-510 MPa).
Testing: Requires low-temperature impact testing (e.g., 0°C) and specific heat treatments (like Normalizing) for thicker plates, as detailed in mill test certificates (MTCs).
CCS vs. ABS:
Certification: China Classification Society (CCS) and American Bureau of Shipping (ABS) are independent maritime classification societies that set standards for ship construction and materials.
Equivalency: While properties are similar, the designation (CCS B or ABS B) signifies compliance with that specific society's rules, crucial for vessel classification and registration.In essence, they are similar materials for similar jobs, just bearing the stamp of different regulatory bodies for international maritime use.