BV EH32 Shipbuilding Steel Coil
BV EH32 Shipbuilding Steel Coil: High-Strength Marine Structural Steel for Extreme Environments
Explore the complete data sheet for BV EH32 shipbuilding steel coil, covering chemical composition, mechanical and thermal properties, international equivalents, and application guidance for ship and offshore constructions.
Hot rolling, controlled rolling, normalizing, TMCP (thermo-mechanical control process)
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BV EH32 Shipbuilding Steel Coil Introduction
BV EH32 is a high-strength hull structural steel grade certified by Bureau Veritas (BV) under the Rules for the Classification of Steel Ships. It is specifically designed for marine and offshore applications requiring a minimum yield strength of 315 MPa combined with excellent weldability and superior notch toughness at low temperatures. Typical delivery condition includes hot-rolled, controlled-rolled, normalized, or thermo-mechanically controlled processed (TMCP) products. This grade is widely used in the construction of ship hulls, decks, bulkheads, and critical structural members where safety and reliability in harsh sea environments are paramount. With its balanced chemistry and fine grain structure, EH32 offers good resistance to brittle fracture and fatigue, making it a preferred choice for vessels operating in cold regions.
BV EH32 Shipbuilding Steel Coil Chemical Composition
The chemical requirements for BV EH32 shipbuilding steel are specified in BV Rules Part 2, Chapter 2. The composition ensures a fine ferritic-pearlitic microstructure with controlled grain size. Carbon equivalent (CE) is limited to guarantee weldability. Micro-alloying elements such as Nb, V, Ti may be added singly or in combination to achieve the required strength and toughness. Actual values are subject to ladle analysis and product analysis tolerances.
| Element | Standard Value (max or range) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.18 | Ladle analysis |
| Manganese (Mn) | 0.90 – 1.60 | Ladle analysis |
| Silicon (Si) | ≤ 0.50 | Ladle analysis |
| Phosphorus (P) | ≤ 0.035 | Ladle analysis |
| Sulfur (S) | ≤ 0.035 | Ladle analysis |
| Aluminium (Al) acid soluble | ≥ 0.015 | Grain refining |
| Niobium (Nb) * | 0.02 – 0.05 | Optional; if sufficient Al is used, Nb may be omitted |
| Vanadium (V) * | 0.05 – 0.10 | Optional; may be used alone or with Nb |
| Titanium (Ti) * | ≤ 0.02 | Optional; grain refinement |
| Copper (Cu) | ≤ 0.35 | |
| Chromium (Cr) | ≤ 0.20 | |
| Nickel (Ni) | ≤ 0.40 | |
| Molybdenum (Mo) | ≤ 0.08 | |
| Carbon Equivalent (CE) | ≤ 0.38 | CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 |
BV EH32 Shipbuilding Steel Coil Thermal and Electrical Physical Properties
Physical properties are approximate typical values for ferritic shipbuilding steel at ambient temperature. They are not mandatory specification requirements but are useful for design calculations. Values may vary slightly with heat treatment and exact composition.
| Property | Typical Value | Unit | Test Condition / Reference |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | 20°C |
| Modulus of Elasticity (E) | 205 – 210 | GPa | 20°C; tensile |
| Shear Modulus (G) | ~80 | GPa | 20°C; calculated |
| Poisson's Ratio (ν) | 0.3 | – | 20°C |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | 20 – 100°C |
| Thermal Conductivity (λ) | ~50 | W/(m·K) | 20°C |
| Specific Heat Capacity (c) | ~460 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρ_e) | ~0.20 | 10⁻⁶ Ω·m | 20°C |
BV EH32 Shipbuilding Steel Coil Mechanical Properties
Mechanical properties are based on BV Rules for thickness ≤ 50 mm (typical for coil products). Tensile testing is performed on transverse test pieces. Charpy V-notch impact tests are carried out at -40°C. The bend test ensures ductility. Values may be adjusted for thicker products or alternative heat treatments. Actual values shall comply with the certificate.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 315 | MPa | t ≤ 50 mm; transverse specimen |
| Tensile Strength (Rm) | 440 – 590 | MPa | t ≤ 50 mm; transverse specimen |
| Elongation (A5) | ≥ 22 | % | Gauge length 5.65√S₀; t ≤ 50 mm |
| Bend Test | d = 3a (180°) | – | Bend radius d=3 x thickness a; t ≤ 50 mm |
| Impact Energy (KV₂) | ≥ 34 (longitudinal) | J | Charpy V-notch at -40°C; longitudinal |
| Impact Energy (KV₂) | ≥ 24 (transverse) | J | Charpy V-notch at -40°C; transverse |
BV EH32 Shipbuilding Steel Coil Fully Equivalent Material Standards & Substitutable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| International (BV) | BV Rules Part 2, Ch 2 | EH32 | Original certification grade |
| American Bureau of Shipping | ABS Rules | EH32 | Identical strength/toughness requirements |
| DNV GL | DNV GL Rules | NV E32 | Fully equivalent |
| Lloyd's Register | LR Rules | EH32 | Fully equivalent |
| China Classification Society | CCS Rules | EH32 | Fully equivalent |
| Nippon Kaiji Kyokai | NK Rules | KE32 | Equivalent; impact test at -40°C |
| Korean Register | KR Rules | REH32 | Equivalent |
| Registro Italiano Navale | RINA Rules | EH32 | Equivalent |
BV EH32 Shipbuilding Steel Coil Application Introduction
BV EH32 steel coil is specifically developed for the construction of sea-going ships and offshore facilities. Its balanced combination of strength, weldability, and low-temperature toughness makes it suitable for primary structural members that must withstand dynamic loads, corrosion, and potential impact in cold waters. The material can be formed, welded, and machined using standard shipyard practices.
Product Applications: Hull structural plates (shell plating, stringers, sheer strakes), Deck plates and deck stringers, Bulkhead panels and corrugated bulkheads, Bottom and side shell plates, Stiffeners (flat bars, angles, bulb profiles), Hatch coamings and crane pedestal plates, Sea-fastening and grillage structures for transport
Processed into products: Ship hull outer and inner bottom plates, Longitudinal and transverse stiffeners, Web frames, floor plates, and girders, Bulkhead stiffeners and face plates, Deck beams and deck girders, Hatch corner plates and reinforcement pads, Offshore module skid beams and lifting trunnions
Application industries: Shipbuilding (cargo vessels, tankers, container ships, bulk carriers, passenger ships), Offshore & Marine Engineering (jack-ups, semi-submersibles, FPSO modules), Oil & Gas Platform Construction (topsides, jackets, flare booms), Renewable Energy (offshore wind turbine transition pieces and foundations), Port & Harbor Infrastructure (steel sheet piling, fender panels)
BV EH32 Shipbuilding Steel Coil Similar / Near-Equivalent Material Recommendations
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| International (BV) | BV Rules | AH32 | Similar strength but impact test at 0°C; for less severe cold conditions |
| International (BV) | BV Rules | DH32 | Similar strength but impact test at -20°C; intermediate toughness |
| International (BV) | BV Rules | EH36 | Higher strength (min YS 355 MPa); same -40°C toughness; for heavier loaded structures |
| International (BV) | BV Rules | FH32 | Excellent toughness at -60°C; for extreme cryogenic service |
| European | EN 10025-4 | S355ML | Thermo-mechanically rolled structural steel; YS 355 MPa; similar low-temp toughness but different delivery conditions |
Notes:
Weldability: Due to the controlled carbon equivalent (CE ≤ 0.38), the steel exhibits good weldability with low preheat requirements. Standard welding procedures (SMAW, SAW, FCAW, GMAW) are applicable. Non-destructive testing: Plates may be supplied with ultrasonic testing in accordance with BV rules or purchaser specifications. Surface condition: Unless otherwise agreed, surface finish complies with EN 10163-2 Class A, B or C. Tolerances: Dimensional tolerances follow BV rules or relevant international standards (e.g., EN 10029). For any special requirements (e.g., through-thickness properties, Z35), reference should be made to the purchase order and supplementary rules.
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