Description

Technical Parameters

Product Overview | Experience Unmatched Strength for Marine Engineering

CCS Grade B shipbuilding steel plate is a normal-strength structural steel certified by the China Classification Society (CCS). It is one of four quality grades in the general strength shipbuilding steel family (A, B, D, E), with impact testing conducted at 0°C .CCS Grade B is primarily used in the construction of ship hulls, superstructures, and marine engineering structures for vessels operating in moderate climate conditions.As with other general strength grades, the minimum yield strength is 235 MPa, and the tensile strength ranges from 400 to 520 MPa.The main distinction between CCS Grade A, B, D, and E lies in their low-temperature impact toughness requirements and chemical composition controls.

Quality Assurance | Fully Certified & Traceable

One-stop steel procurement

Certifications: We supply CCS Grade B.

Traceability: Each plate is stamped with grade, heat number, and dimensions.

Inspection: Third-party inspections (SGS, BV) are welcome at our loading port.

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Key Specifications & Tolerances

Chemical Composition (Ladle Analysis)

Element	Composition (%)
Carbon (C)	≤ 0.21
Manganese (Mn)	≥ 0.80
Silicon (Si)	≤ 0.35
Phosphorus (P)	≤ 0.035
Sulfur (S)	≤ 0.035

Mechanical Properties

Property	Value
Yield Strength (min)	235 MPa
Tensile Strength	400 – 520 MPa
Elongation (min)	21% – 22%
Impact Test Temperature	0°C
Impact Energy (Longitudinal)	≥ 27 J

Available Dimensions

Parameter	Range
Thickness	3mm – 300mm
Width	1200mm – 4200mm
Length	3000mm – 18000mm

Condition of Supply

Thickness	Condition
t ≤ 50mm	Any (As-rolled, Controlled-rolled, or TMCP)
50mm < t ≤ 100mm	Normalized, Controlled-rolled, or TMCP

Applications | Where is CCS GRADE B Steel Used?

ship-hull-construction-keel-bilge-strakes-marine-steel

Ship Superstructures

Upper decks, deckhouses, and superstructure components.

Sterns and Rudders

Stern frames and rudder structures for coastal vessels.

offshore-platform-jack-up-rig-semi-submersible-fpso-steel-structure

marine-vessel-components-cargo-hold-hatch-cover-tanker-deck

Compartment Bulkheads

Internal partitions and non-critical structural divisions.

Offshore Engineering

General structural applications in marine environments.

ship-repair-retrofit-marine-hull-steel-plate-replacement

CCS Grade A, B, D, E Comparison

Feature	Grade A	Grade B	Grade D	Grade E
Yield Strength (min)	235 MPa	235 MPa	235 MPa	235 MPa
Tensile Strength	400 – 520 MPa	400 – 520 MPa	400 – 520 MPa	400 – 520 MPa
Elongation (min)	22%	22%	22%	22%
Impact Test Temperature	+20°C	0°C	-20°C	-40°C
Impact Energy (Longitudinal)	-	27 J	27 J	27 J
Carbon (C) Max	0.21%	0.21%	0.21%	0.18%
Manganese (Mn) Min	≥ 0.50	≥ 0.80	≥ 0.60	≥ 0.70
Silicon (Si) Max	0.50%	0.35%	0.35%	0.35%
Deoxidation	Any method	Any method	Killed, fine-grained, Al treated	Killed, fine-grained, Al treated
Condition (t≤50mm)	Any	Any	Any	Normalized or TMCP
Condition (t>50mm)	Normalized/CR/TM	Normalized/CR/TM	Normalized/CR/TM	Normalized or TMCP

Grade Selection Guide

Grade A: General structural components, non-critical areas. Impact testing not required (tested at +20°C) .

Grade B: Coastal vessels, bulk carriers, and moderate climate operations where impact toughness at 0°C is sufficient. Requires higher manganese content (≥0.80%) than Grade A and D for improved strength.

Grade D: Ocean-going vessels operating in cold waters down to -20°C. Killed and fine-grained steel with aluminum treatment.

Grade E: Arctic and polar region vessels with -40°C impact requirements and the tightest composition controls.

Available Testing and Services

Ultrasonic Testing (UT): ASTM A435, A577, A578.

Z-direction Testing: Z15, Z25, Z35.

Impact Testing: Charpy V-notch at 0°C .

Third-Party Inspection: SGS, TUV, or other independent inspectors.

Mill Test Certificate: EN 10204 Format 3.1 or 3.2.

Surface Treatment: Shot blasting and painting available upon request.

Dimensions and Packaging

Parameter	Details
Thickness	3mm – 300mm
Width	1200mm – 4200mm
Length	3000mm – 18000mm
Packaging	Standard export seaworthy packing or as per customer requirements
Delivery Time	7 days for stock items; 30–50 days for production orders
Loading Ports	Shanghai, Tianjin, Qingdao

why choose us?

Stock Availability: We maintain 5,000+ tons of AH36 ship plate in standard sizes (6m, 9m, 12m) ready for immediate dispatch.

Custom Cutting: We offer profile cutting, beveling, and services to save you fabrication time.

Fast Logistics: Efficient shipping via break bulk or container to major ports worldwide (Rotterdam, Houston, Singapore, Dubai).

Competitive Pricing: Direct mill cooperation means no middlemen markups.

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User Evaluation

We've been using CCS Grade B plates from this supplier for three years across our coastal bulk carrier projects. The 0°C impact test results are consistently within spec. Mill certificates arrive with every shipment.

Mr. Chen Wei

Singapore · Large Shipbuilding and Repairing Group

We ordered 600 tons of CCS Grade B for superstructure fabrication. The low carbon equivalent made welding straightforward with standard procedures. Rejection rate was under 0.5%.

Ms. Nguyen Thi Hong

Haiphong · Shipbuilding Group of Vietnam

Compared to European suppliers, the price was better and delivery was on schedule for our container ship project. Third-party inspection went smoothly.

Mr. Rajesh Kumar

Kochi, India · Ship Repair Yard

FAQ

01.What is the difference between CCS Grade A and Grade B shipbuilding steel?

Grade B requires impact testing at 0°C with a minimum of 27 Joules, while Grade A does not have an impact test requirement (only expected at +20°C). Grade B also has a higher minimum manganese content (0.80% vs 0.50%) and a lower maximum silicon content (0.35% vs 0.50%) . Grade B is better suited for structures requiring reliable impact toughness at moderate temperatures.

02.Is preheating required for welding CCS Grade B plates?

For thicknesses under 30mm, preheating is generally not required under normal shop conditions. For thicker sections (above 40mm) or when welding in low ambient temperatures, a preheat of 50–100°C is recommended. CCS Grade B has good weldability due to its low carbon equivalent, but always follow an approved welding procedure specification (WPS).

03.What heat treatment condition should I choose?

t ≤ 50mm: As-rolled (AR) or controlled-rolled (CR) is suitable for most applications.

t > 50mm: Normalized (N) or TMCP is required by classification rules to ensure consistent mechanical properties through the full thickness.

04.Can CCS Grade B be used for ocean-going vessels?

Yes, but with limitations. CCS Grade B is impact tested at 0°C, making it suitable for vessels operating in temperate and coastal waters. For vessels navigating cold ocean waters where temperatures drop below 0°C, CCS Grade D (-20°C) or Grade E (-40°C) would be the appropriate choice.

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