CCS Grade B Shipbuilding Steel Plate & Coil
CCS Grade B Shipbuilding Steel Plate & Coil: Comprehensive Material Data & Equivalents
Detailed material analysis for CCS Grade B shipbuilding steel coil/plate, including chemical composition, mechanical properties, physical data, equivalent grades, similar materials, and application guidance.
Suitable for hot rolling, cold forming, bending, welding (all common methods), flame cutting, and machining.
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CCS Grade B Shipbuilding Steel Plate & Coil Introduction
CCS Grade B is a normal strength hull structural steel under the China Classification Society (CCS) rules. It is widely used in shipbuilding and offshore engineering for general structural applications.
- Key characteristics: Good weldability, moderate strength, and reliable impact toughness at 0°C.
- Delivery condition: Typically supplied in the hot-rolled (as-rolled) condition; it is a killed steel with fine-grain practice optional.
- Thickness range: Commonly available from 6 mm up to 100 mm for plates and coils, with guaranteed mechanical properties across this range.
- International equivalents: Covered by most major classification societies, making it interchangeable with ABS Grade B, LR Grade B, DNV B, and others.
CCS Grade B Shipbuilding Steel Plate & Coil Chemical Composition
The chemical composition complies with CCS Rules for normal strength hull structural steel Grade B. Grain refining elements such as Al are added when fine-grain practice is required. Residual elements (Cu, Cr, Ni, Mo) are controlled to ensure weldability and toughness.
| Element | Specified Value (max unless range given) | Remark |
|---|---|---|
| C (Carbon) | 0.21 | max |
| Si (Silicon) | 0.10 – 0.35 | For killed steel; if grain refining by Al is used, Si can be 0.10 – 0.35 |
| Mn (Manganese) | ≥ 0.60 | Typical upper limit 1.00 (t≤25mm) or 1.20 (t>25mm); minimum specified by rule |
| P (Phosphorus) | 0.035 | max |
| S (Sulfur) | 0.035 | max |
| Al (Acid-soluble) | ≥ 0.015 | When fine-grain practice is specified |
| Cu (Copper) | 0.35 | max (residual) |
| Cr (Chromium) | 0.20 | max (residual) |
| Ni (Nickel) | 0.40 | max (residual) |
| Mo (Molybdenum) | 0.08 | max (residual) |
CCS Grade B Shipbuilding Steel Plate & Coil Thermal and Electrical Physical Properties
These values are representative for carbon-manganese structural steels like CCS Grade B. Actual values may vary slightly with composition and processing. They are provided for design calculations not as a requirement.
| Property | Typical Value | Unit | Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Modulus of Elasticity (E) | ≈ 200 – 210 | GPa | Tensile, room temperature |
| Shear Modulus (G) | ≈ 80 – 85 | GPa | Calculated |
| Poisson's Ratio (ν) | ≈ 0.27 – 0.30 | Elastic range | |
| Thermal Expansion Coefficient (α) | 11.5 – 12.5 | 10⁻⁶/K | 20–100°C |
| Thermal Conductivity (λ) | ≈ 52 | W/m·K | At 100°C |
| Specific Heat Capacity | ≈ 460 – 510 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρe) | ≈ 0.15 – 0.20 | 10⁻⁶ Ω·m | At 20°C |
CCS Grade B Shipbuilding Steel Plate & Coil Mechanical Properties
Tensile properties are determined on transverse test pieces (or longitudinal for impact). Impact test temperature is 0°C for Grade B. For thickness above 100 mm, special agreement may be required. Bending test is conducted at room temperature.
| Property | Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 235 | MPa | Thickness ≤ 100 mm |
| Tensile Strength (Rm) | 400 – 520 | MPa | Thickness ≤ 100 mm |
| Elongation (A) | ≥ 22 | % | Gauge length 5.65√So, thickness ≤ 50 mm |
| Elongation (A) | ≥ 21 | % | Thickness > 50 mm to 70 mm |
| Elongation (A) | ≥ 20 | % | Thickness > 70 mm to 100 mm |
| Bend Test (Bend diameter) | d = 2a | 180° bend, a = specimen thickness; for t ≤ 25 mm | |
| Bend Test (Bend diameter) | d = 3a | For t > 25 mm | |
| Impact Energy (KV) | ≥ 27 (mean) / ≥ 20 (individual) | J | Charpy V-notch, longitudinal, 0°C, for thickness ≥ 6 mm |
| Impact Energy (KV) | ≥ 27 (mean) / ≥ 20 (individual) | J | Transverse test, if specified; minimum values same |
CCS Grade B Shipbuilding Steel Plate & Coil Fully Equivalent Materials – International Classification Society Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ABS | Grade B | American Bureau of Shipping – identical strength/toughness requirements |
| UK | Lloyd's Register (LR) | Grade B | Same chemical and mechanical properties |
| France | Bureau Veritas (BV) | Grade B | Recognized as equivalent |
| Norway / Germany | DNV | B (or NV B) | DNV Grade B, fully interchangeable |
| Japan | ClassNK (NK) | Grade B | Nippon Kaiji Kyokai – identical specification |
| Italy | RINA | Grade B | Registro Italiano Navale – equivalent grade |
| South Korea | KR | Grade B | Korean Register – meets same requirements |
CCS Grade B Shipbuilding Steel Plate & Coil Application Introduction
CCS Grade B steel is designed for shipbuilding and offshore structures. It is supplied as plates, coils, and sections and can be processed by cutting, bending, and welding. It is used extensively in:
Product Applications: Hull plating (shell, bottom, side), Deck plates and floor plates, Watertight and non-watertight bulkheads, Stiffeners, frames, and stringers, Superstructure components, Pipe supports and minor structural elements
Processed into products: Flame-cut shapes for web frames and brackets, Rolled and welded stiffeners (angle bars, bulb profiles), Welded T-beams and girders, Shell plates formed by cold or hot bending, Manholes, hatches, and coamings (when moderate strength suffices)
Application industries: Shipbuilding (cargo ships, tankers, passenger vessels, bulk carriers), Offshore oil & gas platforms and rigs, Marine & coastal engineering (breakwaters, docks, lock gates), Barge and pontoon construction, Repair and conversion of vessels
CCS Grade B Shipbuilding Steel Plate & Coil Similar / Substitutable Materials
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | CCS | Grade A | Lower toughness (no impact test required); may substitute if 0°C impact not needed |
| China | CCS | Grade D | Better low-temperature toughness (-20°C); often used for thicker or more critical structures, can replace B |
| China | GB/T 700 | Q235B | Yield 235 MPa, impact at +20°C; not marine-certified but similar strength, can be used in non-marine welded structures |
| EU | EN 10025-2 | S235JR | Yield 235 MPa, room-temperature impact; structural steel, but not specifically for marine classification |
| Japan | JIS G 3106 | SM400A | Welded structural steel, similar strength; impact test not mandatory unless specified |
| International | ISO 630-2 | S235B | Structural steel, impact at +20°C; not directly class-certified for shipbuilding |
Notes:
Welding: CCS Grade B can be welded by all common methods (SMAW, SAW, GMAW, FCAW) with appropriate low-hydrogen consumables. Preheating is generally not required for moderate thicknesses (<50 mm) in ambient conditions, but may be recommended for thick or highly restrained joints. Certification: Material must be produced by a CCS-approved manufacturer and supplied with class certificates. Surface condition: Plates/coils are normally delivered with mill finish (hot-rolled surface) and may require blasting and priming before fabrication.
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