BV F460 Shipbuilding Steel Coil
BV F460 Shipbuilding Steel Coil: High-Strength Marine Plate & Coil for Arctic & Offshore Structures
Comprehensive technical data for BV F460 shipbuilding steel coil: chemical composition, mechanical and physical properties, international equivalents, and application guidelines for ship and offshore engineering.
Thermo-mechanical controlled rolling (TMCP), normalized or quenched & tempered; suitable for cold forming, machining, welding, gas cutting, and bending.
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BV F460 Shipbuilding Steel Coil Introduction
BV F460 is an ultra-high-strength, fine-grain structural steel for shipbuilding, certified by Bureau Veritas (BV) under strict marine classification rules. It belongs to the F-grade (minimum impact energy at -60°C) with a minimum yield strength of 460 MPa.
- Designed for heavy-loaded ship structures, offshore platforms, and arctic vessels
- Excellent low-temperature toughness and weldability through controlled rolling and TMCP
- Available as plates, coils, strips, and sections
- Conforms to BV Rules Pt.2, Ch.1, and is widely accepted in global shipbuilding projects
BV F460 Shipbuilding Steel Coil Chemical Composition
The chemical composition complies with BV Rules for grade F460. Values below are typical range for plate/coil ≤50 mm thickness, controlled to achieve low carbon equivalent (Ceq ≤ 0.47) for excellent weldability and toughness. Alloying elements like niobium, vanadium, and titanium are added for grain refinement and precipitation strengthening.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.18 | Ladle analysis, typical max |
| Silicon (Si) | 0.10 - 0.50 | Deoxidation and strength |
| Manganese (Mn) | 0.90 - 1.60 | Strength and hardenability |
| Phosphorus (P) | ≤ 0.025 | Max allowed |
| Sulfur (S) | ≤ 0.020 | Max allowed |
| Aluminium (Al) | ≥ 0.015 total | Grain refinement |
| Niobium (Nb) | ≤ 0.05 | Micro-alloying |
| Vanadium (V) | ≤ 0.10 | Micro-alloying |
| Titanium (Ti) | ≤ 0.02 | Grain refinement |
| Copper (Cu) | ≤ 0.35 | Residual |
| Nickel (Ni) | ≤ 0.40 | Toughness |
| Chromium (Cr) | ≤ 0.20 | Residual |
| Molybdenum (Mo) | ≤ 0.08 | Residual |
| Nitrogen (N) | ≤ 0.009 | Max allowed |
| Carbon Equivalent (Ceq) | ≤ 0.47 | Ceq = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 |
BV F460 Shipbuilding Steel Coil Thermal and Electrical Physical Properties
Data are typical for 460 MPa TMCP shipbuilding steel and serve as engineering guidelines. Values are measured on as-delivered material unless otherwise noted. Thermal conductivity and expansion are crucial for weld joint design and service performance.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | At 20°C |
| Modulus of elasticity (E) | 205 | GPa | At 20°C, dynamic method |
| Shear modulus (G) | 79 | GPa | Calculated from E and ν |
| Poisson's ratio (ν) | 0.30 | - | At 20°C |
| Coefficient of thermal expansion (α) | 11.7 × 10⁻⁶ | /K | Between 20°C and 100°C |
| Thermal conductivity (λ) | 46 | W/(m·K) | At 20°C |
| Specific heat capacity (cp) | 460 | J/(kg·K) | At 20°C |
| Electrical resistivity (ρe) | 0.22 | μΩ·m | At 20°C |
BV F460 Shipbuilding Steel Coil Mechanical Properties
Mechanical properties are verified in accordance with BV Rules. Values vary with thickness. F460 guarantees minimum 460 MPa yield strength in delivery condition up to 50 mm. Impact toughness tested at -60°C (F-grade) to ensure brittle fracture resistance in polar environments.
| Property | Specified Value | Unit | Testing Condition / Remarks |
|---|---|---|---|
| Yield strength (ReH) | ≥ 460 | MPa | Thickness ≤ 50 mm, transverse |
| Yield strength (ReH) | ≥ 440 | MPa | Thickness > 50 to 100 mm, transverse |
| Yield strength (ReH) | ≥ 400 | MPa | Thickness > 100 to 150 mm, transverse |
| Tensile strength (Rm) | 570 - 720 | MPa | All thicknesses, transverse |
| Elongation after fracture (A) | ≥ 17 | % | Gauge length L0=5.65√S0, thickness ≤ 50 mm |
| Elongation after fracture (A) | ≥ 16 | % | Thickness > 50 to 100 mm |
| Bend test | D=3a (180°), no cracks | - | Thickness ≤ 50 mm, bend mandrel diameter = 3 × specimen thickness |
| Charpy impact energy (KV2) | ≥ 27 (longitudinal) | J | At -60°C, specimen 10×10 mm, longitudinal |
| Charpy impact energy (KV2) | ≥ 20 (transverse) | J | At -60°C, specimen 10×10 mm, transverse |
BV F460 Shipbuilding Steel Coil Direct Equivalent Grades
| Country / Society | Standard / Rule | Grade | Remarks |
|---|---|---|---|
| International (IACS) | IACS UR W11 | F460 | Baseline requirement |
| DNV (Norway/Germany) | DNV Rules Pt.2 Ch.1 | NV F460 | Identical property requirements |
| Lloyd's Register (UK) | LR Rules | LR F460 | Fully equivalent |
| American Bureau of Shipping | ABS Rules | ABS FH460 | Fully equivalent, H = high strength |
| China Classification Society | CCS Rules | CCS F460 | Fully equivalent |
| ClassNK (Japan) | NK Rules | NK F460 / KF460 | KF460 commonly used |
| RINA (Italy) | RINA Rules | RINA F460 | Fully equivalent |
| Russian Maritime Register | RS Rules | RS F460 | Fully equivalent |
BV F460 Shipbuilding Steel Coil Application Introduction
BV F460 steel coil/plate is engineered for critical structural components in ship and offshore constructions where high strength, excellent low-temperature toughness, and weldability are mandatory. Typical users include shipyards, offshore module fabricators, and heavy engineering workshops.
- Hull structural parts: side shell, bottom shell, strength deck, longitudinal bulkheads
- Offshore topside module frames, crane pedestals, helideck support beams
- Polar ship hulls and icebreaker belts requiring -60°C impact resistance
Product Applications: VLCC, ULCC, bulk carriers, container ships, LPG/LNG carriers, Semi-submersible and jack-up drilling rigs, FPSO (floating production storage and offloading) hulls, Ice-breakers and polar research vessels, Offshore substation jackets and monopile transition pieces
Processed into products: Main deck and sheer strake plates, Bottom and side shell plating, Stiffeners, girders, and floor plates, Hatch coamings and crane rail beams, Bilge keel and rudder horn structures, Bracket plates and insert plates in high-stress zones, Bulkhead plate and web frames
Application industries: Shipbuilding (commercial, naval, and special vessels), Offshore oil & gas platform construction, Renewable energy (offshore wind turbine foundations and substructures), Heavy engineering and lifting equipment (cranes, heavy load beams), Arctic and ice-class vessel manufacturing
BV F460 Shipbuilding Steel Coil Similar Strength / Toughened Steels
| Origin / Standard | Designation | Grade | Remarks |
|---|---|---|---|
| EN 10025-6 | S460QL / S460QL1 | QL | Quenched & tempered structural steel, -60°C optional, not a marine certified grade; may be qualified by class on a case-by-case basis |
| ASTM A709 / AASHTO | A709 Grade HPS 70W | 70W | Weathering steel, min yield 485 MPa, low temperature, not specifically for shipbuilding |
| JIS G 3106 | SM570 | SM570 | Welding structural steel, 570 MPa tensile, used for bridges, may require additional testing for marine use |
| ISO 4950-3 | S460MLO | MLO | TMCP steel for offshore structures, -40°C toughness; not as low as -60°C |
Notes:
Thickness tolerance and surface condition are in accordance with BV Rules and EN 10029 for plates. Additional testing such as through-thickness tensile (Z35), CTOD, or ultrasonic examination can be agreed upon at the time of enquiry and order. Weldability is excellent under preheat and interpass temperature control according to BV Rule requirements.
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