BV EH40 Shipbuilding Steel Coil
BV EH40 Shipbuilding Steel Coil - High Strength Marine Grade Steel Plate for Ice-Class Vessels
BV EH40 is a high-strength shipbuilding steel grade certified by Bureau Veritas (BV) with a minimum yield strength of 390 MPa for thicknesses up to 50 mm. It offers excellent low-temperature toughness with Charpy V-notch impact energy of 34 J at -40°C, making it suitable for ice-strengthened structures and Arctic applications.
Hot rolled, normalized, TMCP; Weldable, cuttable, formable
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BV EH40 Shipbuilding Steel Coil Introduction
BV EH40 is a higher strength hull structural steel grade defined by Bureau Veritas Rules for the Classification of Steel Ships and conforms to IACS UR W11. It is delivered in normalized or thermo-mechanically controlled processed (TMCP) condition. The steel features a minimum yield strength of 390 MPa (t ≤ 50 mm), tensile strength ranging 510-650 MPa, and guaranteed impact toughness at -40°C. Typical applications include critical ship hull components, ice-strengthening plates, and offshore structures. Its chemical composition is microalloyed with Nb, V, Ti to provide fine grain strengthening and weldability with controlled carbon equivalent (CEV max 0.38).
BV EH40 Shipbuilding Steel Coil Chemical Composition
Chemical composition according to IACS UR W11 for Grade EH40. Microalloying elements such as Nb, V and Ti may be added individually or in combination to achieve the required properties. The carbon equivalent (CEV) shall not exceed 0.38% for thickness ≤ 50 mm.
| Element | Specified Value (%) | Remarks |
|---|---|---|
| C (Carbon) | ≤ 0.18 | |
| Mn (Manganese) | 0.90 – 1.60 | |
| Si (Silicon) | ≤ 0.50 | |
| P (Phosphorus) | ≤ 0.035 | |
| S (Sulfur) | ≤ 0.035 | |
| Al (Acid soluble) | ≥ 0.015 | Typically Al killed |
| Nb (Niobium) | 0.02 – 0.05 | If added |
| V (Vanadium) | 0.05 – 0.10 | If added |
| Ti (Titanium) | ≤ 0.02 | If added |
| Cu (Copper) | ≤ 0.35 | |
| Cr (Chromium) | ≤ 0.20 | |
| Ni (Nickel) | ≤ 0.40 | |
| Mo (Molybdenum) | ≤ 0.08 | |
| N (Nitrogen) | ≤ 0.009 | If Al killed |
| Nb+V+Ti | ≤ 0.12 | Combined limit |
| CEV | ≤ 0.38 | thickness ≤ 50 mm |
BV EH40 Shipbuilding Steel Coil Physical Properties
Typical physical properties of EH40 steel at room temperature and elevated temperatures. These values are provided as reference for design and thermal calculation and are not part of the material specification.
| Property | Typical Value | Unit | Conditions |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | 20°C |
| Modulus of Elasticity (E) | 205 | GPa | 20°C |
| Shear Modulus (G) | 80 | GPa | 20°C |
| Poisson's Ratio (ν) | 0.3 | - | 20°C |
| Thermal Expansion (α) | 11.5 × 10⁻⁶ | K⁻¹ | 20 – 100°C |
| Thermal Conductivity (λ) | 51 | W/(m·K) | at 100°C |
| Specific Heat Capacity (cp) | 460 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρₑ) | approx. 0.15 | μΩ·m | 20°C |
BV EH40 Shipbuilding Steel Coil Mechanical Properties
Tensile and impact properties specified for EH40 plates in the normalized or TMCP condition. Testing is performed on transverse specimens unless otherwise stated. Impact energy required at -40°C for longitudinal direction (min 34 J).
| Property | Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | min 390 | MPa | Thickness t ≤ 50 mm, transverse |
| Yield Strength (ReH) | min 380 | MPa | Thickness 50 < t ≤ 70 mm, transverse |
| Tensile Strength (Rm) | 510 – 650 | MPa | t ≤ 70 mm |
| Elongation (A5) | min 20 | % | Gauge length 5.65√So, longitudinal |
| Charpy Impact (KV) | min 34 | J | At -40°C, longitudinal |
| Charpy Impact (KV) | min 24 | J | At -40°C, transverse |
| Bend Test | 180°; d=3a | t ≤ 35 mm | |
| Bend Test | 180°; d=4a | 35 mm < t ≤ 50 mm |
BV EH40 Shipbuilding Steel Coil Equivalent Grades from Other Classification Societies
| Country / Society | Standard | Equivalent Grade | Remarks |
|---|---|---|---|
| USA / ABS | ABS Rules | EH40 | Identical to IACS UR W11 |
| China / CCS | CCS Rules | EH40 | |
| Norway / DNV | DNV Rules | E40 | Former NV E40 |
| UK / LR | LR Rules | EH40 | |
| Japan / NK | NK Rules | KE40 | |
| South Korea / KR | KR Rules | EH40 | |
| Italy / RINA | RINA Rules | EH40 | |
| Russia / RMRS | RMRS Rules | E40 | |
| India / IRS | IRS Rules | EH40 | |
| Poland / PRS | PRS Rules | EH40 |
BV EH40 Shipbuilding Steel Coil Application Introduction
BV EH40 steel is designed for welded structures in shipbuilding and offshore engineering where high strength and excellent low-temperature impact toughness are essential. It is commonly used in icebreaker hulls, Arctic ships, and critical structural members such as shell plates, decks, and bulkheads. The steel can be processed by various welding methods (SAW, SMAW, FCAW) with appropriate preheat and interpass temperature control. It is also suitable for cold bending, machining, and flame cutting.
Product Applications: Ship hull plates and profiles, Cargo hold structural members, Ice-strengthening belts and transoms, Deck plating and hatch covers, Longitudinal and transverse frames, Bulkhead plates, Rudder horns and stern frames
Processed into products: Shell plates (keel, bilge, side), Main deck stringers and web frames, Bulkhead stiffeners and brackets, Stem and stern posts, Rudder plates, Ice knife and ice horn, Bollards and mooring pads (as rolled)
Application industries: Shipbuilding (commercial and naval vessels, ice-class ships), Offshore oil & gas (jackets, topsides, FPSO modules), Marine engineering (port structures, lock gates, drilling rigs), Renewable energy (offshore wind turbine foundations)
BV EH40 Shipbuilding Steel Coil Similar or Alternative Steel Grades
| Country / Society | Standard | Grade | Remarks |
|---|---|---|---|
| Various / IACS | IACS UR W11 | DH40 | Same strength, impact at -20°C; can be used where lower toughness is acceptable |
| Various / IACS | IACS UR W11 | EH36 | Lower yield strength (355 MPa), impact at -40°C; may be considered with increased scantlings |
| Europe | EN 10025-4 | S420ML | Thermomechanical rolled, min yield 420 MPa, KV -50°C 27J; suitable for structural applications but not directly class-approved without additional testing |
| USA | ASTM A131 / A131M | EH40 | Same strength and toughness, often used in American vessels; requires BV endorsement for dual certification |
Notes:
Note: The above data are based on IACS UR W11 Rev.11 and BV Rules Part 2, Chapter 1, published June 2022. For actual material certificates, the specific heat number and manufacturing process must be verified. Welding consumables shall be selected to match the mechanical properties and toughness requirements. Preheating may be necessary depending on thickness, combined thickness, and weld hydrogen control. Supplementary requirements such as Z-grade (through-thickness properties) or CTOD testing may be specified for critical offshore applications.
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