BV Grade B Shipbuilding Steel Coil
BV Grade B Shipbuilding Steel Coil - Composition, Properties & Global Equivalents
Comprehensive material data for BV Grade B shipbuilding steel coil, including chemical composition, mechanical properties, physical properties, and international equivalents according to Bureau Veritas rules.
Cutting, Welding, Bending, Forming, Stamping
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BV Grade B Shipbuilding Steel Coil Introduction
BV Grade B is an ordinary-strength hull structural steel specified under Bureau Veritas (BV) rules for shipbuilding. It exhibits a minimum yield strength of 235 MPa, good weldability, and reliable notch toughness at 0 °C. Key attributes:
- Controlled chemical composition (C, Mn, Si, P, S) ensures consistent weldability.
- Guaranteed impact toughness (27 J longitudinal at 0 °C) for safe operation in moderate climates.
- Available as coil, plate, or strip, suitable for automated cutting and welding lines.
- Fully equivalent to Grade B steels of all major IACS classification societies.
BV Grade B Shipbuilding Steel Coil Chemical Composition
The following limits apply to heat analysis according to BV rules and IACS UR W11 for ordinary-strength hull structural steel. Residual elements (Cr, Ni, Cu, Mo) are controlled to ensure steel quality and weldability.
| Element | Standard Value (max unless range) | Remark |
|---|---|---|
| C | ≤ 0.21 | Thickness independent |
| Mn | ≥ 2.5 × C (typically ≥ 0.80) | Minimum requirement |
| Si | ≤ 0.35 | Killed steel practice |
| P | ≤ 0.035 | |
| S | ≤ 0.035 | |
| Cr | ≤ 0.25 | Residual |
| Ni | ≤ 0.30 | Residual |
| Cu | ≤ 0.35 | Residual |
| Mo | ≤ 0.08 | Residual |
| Total residuals (Cr+Ni+Cu+Mo) | ≤ 0.70 | Per IACS UR W11 |
BV Grade B Shipbuilding Steel Coil Physical Properties
These physical properties are typical for carbon‑manganese structural steel and are provided as general reference data. They are not specified in the BV classification standard.
| Property | Typical Value | Unit | Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Modulus of Elasticity (E) | 210 | GPa | 20 °C |
| Shear Modulus (G) | 80 | GPa | 20 °C |
| Poisson's Ratio (ν) | 0.3 | — | 20 °C |
| Thermal Expansion Coefficient (α) | 12 × 10⁻⁶ | K⁻¹ | 20 – 100 °C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | 20 °C |
| Specific Heat Capacity | 460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρₑ) | 0.15 | μΩ·m | 20 °C |
BV Grade B Shipbuilding Steel Coil Mechanical Properties
Values extracted from BV Rules for thicknesses up to 100 mm. Impact test temperature is 0 °C. Specimens are taken in the longitudinal and transverse directions as required; minimum energy values are given for standard V‑notch Charpy tests.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 235 | MPa | All thicknesses ≤ 100 mm |
| Tensile Strength (Rm) | 400 – 520 | MPa | All thicknesses ≤ 100 mm |
| Elongation (A) | ≥ 22 | % | t ≤ 50 mm, gauge 5.65√S₀ |
| Elongation (A) | ≥ 21 | % | 50 < t ≤ 70 mm, gauge 5.65√S₀ |
| Elongation (A) | ≥ 20 | % | 70 < t ≤ 100 mm, gauge 5.65√S₀ |
| Bend Test (180°) | d = 3a | — | t ≤ 25 mm |
| Bend Test (180°) | d = 4a | — | t > 25 mm |
| Impact Energy (KV, longitudinal) | ≥ 27 | J | 0 °C |
| Impact Energy (KV, transverse) | ≥ 20 | J | 0 °C |
BV Grade B Shipbuilding Steel Coil Full Equivalents – Identical Grade B Steels by Other Classification Societies
| Country / Region | Standard | Grade | Remark |
|---|---|---|---|
| International | IACS UR W11 | Grade B | Unified requirement for ordinary strength hull structural steel |
| USA | ABS | ABS Grade B | American Bureau of Shipping |
| Norway / Germany | DNV | DNV Grade B | Det Norske Veritas (today DNV) |
| UK | LR | LR Grade B | Lloyd's Register |
| Germany | GL | GL Grade B | Germanischer Lloyd (merged into DNV) |
| Japan | NK | NK Grade B | Nippon Kaiji Kyokai (ClassNK) |
| China | CCS | CCS Grade B | China Classification Society |
| South Korea | KR | KR Grade B | Korean Register |
| Italy | RINA | RINA Grade B | Registro Italiano Navale |
BV Grade B Shipbuilding Steel Coil Application Introduction
BV Grade B steel coil is extensively used in ship and marine construction due to its balanced strength, toughness, and ease of fabrication. It can be cold formed, hot rolled, welded, and cut without special precautions beyond standard shipyard practice.
Product Applications: Ocean‑going vessel hulls, Coastal and inland waterway ships, Deck and bottom plating, Bulkheads and superstructures, Barges and pontoons, Fixed offshore platform jackets and decks
Processed into products: Hull plates and shell plating, Longitudinal stiffeners and transverse frames, Web frames and brackets, Beams, girders, and stringers, Tank plating (ballast, fuel, fresh water), Engine room structures and foundations
Application industries: Shipbuilding, Marine Engineering, Offshore Oil & Gas Structures, Port & Harbor Infrastructure
BV Grade B Shipbuilding Steel Coil Similar / Near‑Equivalent Materials
| Country / Region | Standard | Grade | Remark |
|---|---|---|---|
| International | ASTM A131 / A131M | Grade B | Identical chemistry and 0 °C impact requirement for shipbuilding |
| European | EN 10025‑2 | S235J2 (+N) | Structural steel with 235 MPa yield, 0 °C impact; not certified for marine use |
| China | GB/T 712 | B | Chinese shipbuilding steel, same strength and impact temperature as BV Grade B |
Notes:
Welding: BV Grade B can be welded by all common processes (SMAW, SAW, GMAW). Preheating is generally not required for thicknesses below 30 mm; higher thicknesses or low ambient temperatures may require preheat as per approved welding procedures. Formability: Suitable for cold forming with a minimum bending radius of 2t (t = thickness) when bending transverse to the rolling direction. Excellent flatness and surface quality make it suitable for automated panel lines. Certification: All coils are supplied with BV (or equivalent IACS) certification, including test certificates 3.1 or 3.2 per EN 10204.
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