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CCS Grade B Shipbuilding Steel Plate - CCS Certified Normal-Strength Marine Structural Steel

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CCS Grade B shipbuilding steel plates are standard-strength marine structural steel plates certified by the China Classification Society (CCS). Featuring stable mechanical properties, Charpy impact toughness at 0°C, excellent weldability and resistance to marine corrosion, they are widely used in coastal vessels, bulk carriers, ship repairs and general marine structural construction. We supply high-quality CCS Grade B steel plates, complete with factory test certificates and official CCS certification. All dimensions-including thickness, width and length - can be customised, and shot blasting and anti-corrosion coatings are available. Competitive pricing and rapid delivery support shipbuilding and offshore engineering projects.

Certification :
CCS Rules
Standard :
GB/T 712
Grade :
CCS Grade B (CCSB)
Thickness :
5.0 - 150.0 mm
Width :
1500.0 - 3950.0 mm
Length :
6000.0 - 18000.0 mm

Special thickness, width, and length can be negotiated separately.
We also provide customized processing services.If you have any questions, please contact us.

Overview

1. What is CCS Grade B shipbuilding steel plate?

CCS Grade B shipbuilding steel plates are standard-strength hull structural steel plates certified by the China Classification Society (CCS), and form part of the standard-strength marine structural steel (Grade A/B/D/E) series. Produced in strict accordance with GB/T 712 and CCS material specifications, this steel plate offers stable mechanical properties, good impact toughness at 0°C, excellent weldability and formability, and resistance to seawater and atmospheric corrosion. It is suitable for medium-sized vessels, coastal shipbuilding, general hull structures, decks and conventional offshore engineering facilities, and represents a cost-effective marine steel product.

2. Meaning of the Designation

CCS: Certified by the China Classification Society

B: Quality Grade B (Impact toughness grade: Impact test at 0°C)

Available Specifications and Dimensions

Product	CCS Grade B Shipbuilding Steel Plate
Certification	CCS
Grade	B
Material Category	Normal-strength Structural Steel for Shipbuilding
Thickness	5 - 150 mm
Width	1500 - 3950 mm
Length	6000 - 18000 mm
Delivery Conditions	Hot Rolled (HR), Controlled Rolled (CR), Normalized (N), Thermo-Mechanical Controlled Processed (TMCP), Quenched and Tempered (Q+T).
Surface Conditions	Surface pretreatment (shot blasting, rust removal, oiling, painting, etc.) is available.
Testing	Tensile test, Charpy V-notch impact test, Ultrasonic testing (UT), Z-direction property test (Grades Z15/Z25/Z35), Dimensional inspection, Custom cutting.
Applications	Widely used in inland waterway and coastal vessels, superstructures and auxiliary structures for offshore engineering.
MOQ	50 tons (small orders can be negotiated).
Delivery Time	15 - 20 days after order confirmation (urgent orders accepted)
Packaging	Standard export packaging for sea transport, or as required.
Country of origin	China

Chemical Composition

Chemical Composition (Heat Analysis, wt %)

Grade	C	Si	Mn	P	S	Cu	Cr	Ni	Als
CCS B	≤ 0.21	≤ 0.35	≥ 0.80	≤ 0.035	≤ 0.035	≤ 0.35	≤ 0.30	≤ 0.30	-

Carbon Equivalent (wt %)

Thickness (mm)	5 - 50	50 - 150
Typical CEV (wt %)	≤ 0.38	≤ 0.40

Calculation formula (IIW): CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15

Mechanical Properties

Tensile test

Grade	Yield Strength (ReH), MPa	Tensile Strength (Rm), MPa	Elongation (A), %
CSS B	≥ 235	400 - 520	≥ 22

Charpy (V-notch) impact test

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
CCS B	≤ 50	0	27	20
	> 50 - 70		34	24
	> 70 - 150		41	27

* CCS Grade B steel plates with a thickness not exceeding 25 mm may be exempted from impact testing, subject to agreement between the supplier and the purchaser.

FAQ

# 1Q:What is the difference between CCS Grade A and Grade B shipbuilding steel plates?

The main difference lies in the impact test temperature requirements. Grade A typically does not require impact testing at room temperature, whereas Grade B must be tested at 0°C and is suitable for slightly colder marine environments.

# 2Q:What are the differences between CCS Grade A, B, D and E shipbuilding steel plates?

The main difference between CCS Grade A, B, D and E shipbuilding steel plates lies in the impact test temperature requirements.

Grade	Thickness	Impact Test Temperature	Impact Energy, KV₂ / J	Suitable for Marine Environments
CCS A	≤ 50 mm	20 °C	-	Warm marine environments.
CCS B	≤ 50 mm	0 °C	27(Longitudinal), 20(Transverse)	Cold-water marine environments.
CCS D	≤ 50 mm	- 20 °C	27(Longitudinal), 20(Transverse)	Polar marine environments with extremely low temperatures.
CCS E	≤ 50 mm	- 40 °C	27(Longitudinal), 20(Transverse)	Polar/ice regions and ultra-low-temperature deep-sea environments.