BV AH40 Shipbuilding Steel Coil
BV AH40 Shipbuilding Steel Coil | High-Strength Marine Grade for Hull Structures
Discover BV AH40 shipbuilding steel coil with minimum 390 MPa yield strength, excellent weldability, and certified by Bureau Veritas for marine structural applications.
Cutting, welding, bending, forming, cold working
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BV AH40 Shipbuilding Steel Coil Introduction
BV AH40 is a high-strength hull structural steel grade certified by Bureau Veritas in compliance with IACS UR W11. It belongs to the AH40 category, denoting a minimum yield strength of 390 MPa and impact testing at 0°C. This grade is specifically tailored for shipbuilding and offshore engineering, offering superior weldability, formability, and resistance to brittle fracture in cold environments.
- Minimum yield strength: 390 MPa
- Impact temperature: 0°C
- Steel form: hot-rolled coil
BV AH40 Shipbuilding Steel Coil Chemical Composition
Typical chemical composition according to BV Rules and IACS UR W11 for AH40 shipbuilding steel. Refining elements such as Nb, V, Ti and Al are added to achieve fine grain structure and improve impact toughness.
| Element | Standard Value | Remarks |
|---|---|---|
| C | ≤0.18 | Carbon |
| Mn | 0.90–1.60 | Manganese |
| Si | ≤0.50 | Silicon |
| P | ≤0.025 | Phosphorus (lower than IACS max 0.035 as typical practice) |
| S | ≤0.025 | Sulfur (lower than IACS max 0.035 as typical practice) |
| Al (total) | ≥0.020 | Acid-soluble aluminum for grain refinement |
| Nb | 0.02–0.05 | Niobium (optional) |
| V | 0.05–0.10 | Vanadium (optional) |
| Ti | ≤0.02 | Titanium |
| Cu | ≤0.35 | Copper |
| Cr | ≤0.20 | Chromium |
| Ni | ≤0.40 | Nickel |
| Mo | ≤0.08 | Molybdenum |
| N | ≤0.009 | Nitrogen |
BV AH40 Shipbuilding Steel Coil Thermal and Electrical Physical Properties
Representative physical properties at room temperature for high-strength shipbuilding steel. Actual values may vary slightly with composition and heat treatment.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Modulus of elasticity (E) | 210 | GPa | 20°C |
| Shear modulus (G) | 81 | GPa | 20°C |
| Poisson's ratio (ν) | 0.30 | — | Ambient |
| Thermal expansion coefficient (α) | 11.7 | ×10⁻⁶/K | 20–100°C |
| Thermal expansion coefficient (α) | 12.4 | ×10⁻⁶/K | 20–200°C |
| Thermal expansion coefficient (α) | 12.9 | ×10⁻⁶/K | 20–300°C |
| Thermal conductivity (λ) | 47 | W/(m·K) | 20°C |
| Thermal conductivity (λ) | 42 | W/(m·K) | 200°C |
| Specific heat capacity (Cp) | 460 | J/(kg·K) | 20°C |
| Specific heat capacity (Cp) | 500 | J/(kg·K) | 200°C |
| Electrical resistivity (ρ_e) | 0.22 | ×10⁻⁶ Ω·m | 20°C |
BV AH40 Shipbuilding Steel Coil Mechanical Properties
Mechanical properties according to BV Rules for AH40 steel plate/coil with thickness ≤50 mm, unless otherwise noted. Transverse values may apply to wide plate products.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | ≥390 | MPa | Ambient |
| Tensile strength (Rm) | 510–650 | MPa | Ambient |
| Elongation (A5) | ≥20 | % | Gauge length 5.65√S0, longitudinal |
| Bending test (bend diameter) | 3t (t≤20 mm), 4t (20| — | 180° bend, no cracks | |
| Impact test (KV) | ≥34 | J | 0°C, longitudinal, Charpy V-notch |
| Impact test (KV) | ≥24 | J | 0°C, transverse, Charpy V-notch |
BV AH40 Shipbuilding Steel Coil Fully Equivalent Material Standards and Grade Substitution Recommendations
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| International (BV) | BV NR216 | AH40 | Base material |
| USA (ABS) | ABS Rules | AH40 | Identical IACS UR W11 |
| Norway (DNV) | DNV Rules | AH40 | Identical requirements |
| UK (LR) | LR Rules | AH40 | Identical mechanical/chemical |
| China (CCS) | CCS Rules | AH40 | Equivalent to GB 712-2011 AH40 |
| Korea (KR) | KR Rules | AH40 | Same specifications |
| Japan (NK) | NK Rules | AH40 | Same specifications |
| Italy (RINA) | RINA Rules | AH40 | Same specifications |
| Russia (RS) | RS Rules | AH40 | Equivalent, minor differences in impact test orientation |
BV AH40 Shipbuilding Steel Coil Application Introduction
BV AH40 steel coil is designed for critical hull structures and offshore components where high strength and good toughness at 0°C are mandatory. Its weldability and formability enable efficient fabrication of large panels and curved sections.
Product Applications: Bulk carriers, Container ships, Tankers, Floating production storage and offloading (FPSO) units, Semi-submersible rigs, Jack-up rig legs and hull, Offshore wind turbine transition pieces
Processed into products: Hull plates and shells, Bottom and side longitudinals, Transverse frames and stringers, Bulkhead plates, Deck plates and hatch coamings, Stiffeners and brackets, Bracing and pillar structures
Application industries: Shipbuilding, Offshore oil and gas platforms, Marine engineering, Port and harbor construction, Renewable energy (offshore wind foundations)
BV AH40 Shipbuilding Steel Coil Near / Alternative Material Recommendations
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | BV Rules | DH40 | Higher toughness at -20°C, otherwise similar strength |
| International | BV Rules | EH40 | Impact test at -40°C, for Arctic applications |
| International | BV Rules | AH36 | Lower strength (min yield 355 MPa), may be used where strength can be reduced |
| European | EN 10025-4 | S420ML | TMCP structural steel, comparable strength but without BV shipbuilding certification |
| Chinese | GB/T 712 | AH40 | Shipbuilding steel AH40 under Chinese standard; nearly identical |
Notes:
Important:
- Material must be certified by Bureau Veritas surveyor with issued 3.2 certificate under EN 10204.
- For thickness >50 mm, lower yield strength and impact energy may be specified according to BV rules.
- Welding consumables should match the base material; preheat may be required for thick sections.
- Coil products may be supplied in as-rolled, normalized, or TMCP condition – verify with the mill certificate.
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