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

Q: What is the maximum delivery thickness for CCS Grade B shipbuilding steel plates? What are the typical delivery conditions?

1. Thickness rangeCCS B shipbuilding steel plates is typically supplied in thicknesses ranging from 5 mm to 100 mm.2. Delivery conditionThickness (mm)Delivery condition≤ 25Hot-rolled (AR), Controlled-rolled (CR)> 25 – 50Controlled-rolled (CR), Normalised (N)> 50Normalised (N), Thermomechanical controlled process (TMCP)

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

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CCS Grade B shipbuilding steel plates are ordinary-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 - 4000.0 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	Ordinary-Strength Structural Steel for Ship and Ocean Engineering
Thickness	5 - 150 mm
Width	1500 - 4000 mm
Length	6000 - 18000 mm
Delivery Conditions	Hot Rolled (HR), Controlled Rolled (CR), Normalized (N), Thermo-Mechanical Controlled Processed (TMCP).
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	5 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	0	≥ 34	≥ 24
	> 70 - 150	0	≥ 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.

Applications

CCS Grade B (CCSB) is a ordinary-strength structural steel plate for shipbuilding certified by the China Classification Society. This material offers stable mechanical properties, good weldability and formability, as well as resistance to seawater and atmospheric corrosion, and is cost-effective. It is widely used in inland waterway and coastal vessels, superstructures, and auxiliary structures for offshore engineering.

1. Shipbuilding (Core Applications)

a) Inland waterway vessels

Main hulls, decks, bulkheads and superstructures of cargo ships, bulk carriers, oil tankers and tugs.

b) Seagoing vessels

Superstructures, stern sections, rudders, rudder blades, non-load-bearing decks and side walls.

Deck, hatch coamings, superstructure and lashing structures of container ships.

c) Engineering Vessels

Non-load-bearing structures, platforms, walkways and fenders of dredgers and crane vessels.

2. Ship Repair and Conversion

Hull plating replacement, superstructure modification, deck and bulkhead repairs, and replacement of brackets and bases.

3. Auxiliary Structures for Offshore Engineering

Platform walkways, guardrails, fenders, living quarters modules, supports, ladders, gangways.

Subsea pipeline supports, protective structures, small jacket ancillaries.

4. Port Machinery and Marine Equipment

Non-load-bearing structures of gantry cranes and quay cranes, platforms, walkways.

Other Information

Key Advantages of CCS Grade B Shipbuilding Steel Plates

1. Excellent impact toughness at 0°C

It exhibits stable impact energy absorption at 0°C, effectively reducing the risk of brittle fracture in ships when exposed to fluctuations in seawater temperature or whilst navigating in cold waters.

2. Stable Mechanical Strength

With a minimum yield strength of 235 MPa and a tensile strength range of 400–520 MPa, it meets the basic requirements for load-bearing capacity and strength in conventional ship hull structures.

3. Good weldability and workability

Designed with a low carbon equivalent, it facilitates cutting, bending, rolling and various standard shipyard welding processes, whilst being resistant to cold cracking.

4. Resistance to marine environment corrosion

Optimised silicon and manganese content enhances the material’s resistance to seawater erosion and marine atmospheric corrosion, thereby extending the service life of the steel plates.

5. CCS Certification and Full Traceability

Each batch of steel plates is accompanied by an original Mill Test Certificate (MTC) and the CCS seal, and supports third-party inspections by organisations such as SGS and BV, ensuring traceability of material origin and quality.

6. High Value for Money

As a standard-strength marine steel plate, it strikes a good balance between strength, toughness and price, making it suitable for large-scale shipbuilding and ship repair projects.

Why choose our CCS Grade B shipbuilding steel plates?

1. Full certification and end-to-end traceability

Each steel plate comes with a CCS factory approval certificate and a Material Test Certificate (MTC), and supports third-party inspection (e.g. SGS, BV).

2. Rigorous Quality Control

We implement dual inspections of raw materials and finished products, with 100% non-destructive testing coverage.

3. Full-Range Customisation Service

We can provide customised dimensions to meet project requirements, flexibly adapting to design specifications.

4. Comprehensive Further Processing Capabilities

We offer one-stop further processing services, including heat treatment, rolling, cutting, drilling and surface anti-corrosion treatment.

5. Stable Supply and On-Time Delivery

We maintain stable stock levels and rely on a well-established maritime logistics network to ensure timely delivery.

6. Round-the-Clock After-Sales Service

We provide 24/7 technical support and after-sales service to meet all your one-stop marine steel requirements.

FAQ

Q1:

In ship hull structures, in which parts are CCS Grade B shipbuilding steel plates primarily used?

They are widely used in non-core or moderately stressed parts of the hull structure, primarily including:

outer plates (hull plates, non-ice-class reinforced sections), decks, inner bottom plates and bulkheads, superstructures and bridge decks.

Q2:

What are the weldability characteristics of CCS Grade B shipbuilding steel plates?

CCS Grade B shipbuilding steel plates have low carbon content and carbon equivalent, and exhibit excellent weldability. Under normal circumstances, preheating is not required during welding; however, when working with thick plates or in extremely low-temperature environments, it is recommended to carry out preheating in accordance with specific process requirements.

Q3:

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.

Q4:

What is the maximum delivery thickness for CCS Grade B shipbuilding steel plates? What are the typical delivery conditions?

1. Thickness range

CCS B shipbuilding steel plates is typically supplied in thicknesses ranging from 5 mm to 100 mm.

2. Delivery condition

Thickness (mm)	Delivery condition
≤ 25	Hot-rolled (AR), Controlled-rolled (CR)
> 25 – 50	Controlled-rolled (CR), Normalised (N)
> 50	Normalised (N), Thermomechanical controlled process (TMCP)

Q5:

What surface treatment options are available?

We offer pre-treatment services, including shot blasting and priming, to prevent corrosion during transport and storage.

Q6:

Can you carry out painting and rust removal on CCS marine steel plates?

Yes, we offer shot blasting for rust removal and primer coating services, in accordance with ISO standards.

Q7:

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.

Q8:

Do you provide official CCS certificates?

Yes, we can provide material certificates issued by CCS for all our CCS shipbuilding steel plates.

Q9:

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.