LR EH46 Shipbuilding Steel Coil
LR EH46 Shipbuilding Steel Coil: High Strength Grade for Marine Structures
Explore LR EH46 shipbuilding steel coil with high strength, excellent toughness at -40°C, and good weldability for marine and offshore applications.
Hot Rolling, Normalizing, Thermo-Mechanical Control Process (TMCP), Quenching and Tempering (Q&T) according to specific requirements
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LR EH46 Shipbuilding Steel Coil Introduction
LR EH46 is a high-strength shipbuilding steel grade standardized by Lloyd's Register (LR) for use in hull structures and marine applications. It offers a minimum yield strength of 460 MPa and enhanced low-temperature toughness, suitable for service in cold environments. The material is typically supplied as hot-rolled coils or plates in normalized or thermo-mechanically controlled process (TMCP) conditions. EH46 provides excellent weldability and corrosion resistance, making it ideal for critical structural components in large vessels, offshore platforms, and marine equipment.
LR EH46 Shipbuilding Steel Coil Chemical Composition
The chemical composition of LR EH46 steel is controlled to achieve high strength, good weldability, and low-temperature toughness. Typical limits based on LR Rules are provided below. Microalloying elements such as niobium (Nb), vanadium (V), and titanium (Ti) may be added singly or in combination to refine the grain structure.
| Element | Specification (max, %) | Remarks |
|---|---|---|
| C | 0.18 | max |
| Si | 0.10 - 0.50 | range |
| Mn | 0.90 - 1.60 | range |
| P | 0.025 | max |
| S | 0.025 | max |
| Al (acid soluble) | ≥ 0.015 | min, total Al or acid soluble |
| Nb | 0.02 - 0.05 | typical microalloy addition |
| V | 0.05 - 0.10 | typical microalloy addition |
| Ti | 0.01 - 0.02 | typical microalloy addition |
| Cr | 0.20 | max, residual |
| Ni | 0.40 | max, residual |
| Mo | 0.08 | max, residual |
| Cu | 0.35 | max, residual |
| N | 0.009 | max for normalized steel |
| Ceq | 0.40 | typical, carbon equivalent (IIW) for TMCP |
LR EH46 Shipbuilding Steel Coil Thermal and Electrical Physical Properties
Physical properties are typical for carbon-manganese structural steel at room temperature unless otherwise noted. These values can be used for engineering calculations.
| Property | Typical Value | Unit | Test Conditions |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic Modulus (E) | 205 | GPa | Room temperature |
| Shear Modulus (G) | ~80 | GPa | Calculated from E and Poisson's ratio |
| Poisson's Ratio (ν) | 0.3 | - | Room temperature |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | 20–100 °C |
| 13.0 | 10⁻⁶/K | 20–200 °C | |
| 14.0 | 10⁻⁶/K | 20–300 °C | |
| Thermal Conductivity (λ) | ~45–50 | W/m·K | Room temperature |
| Specific Heat Capacity | ~480–510 | J/kg·K | Room temperature |
| Electrical Resistivity (ρ_e) | ~0.20–0.25 | μΩ·m | Room temperature |
LR EH46 Shipbuilding Steel Coil Mechanical Properties
Mechanical properties are based on LR Rules for thicknesses up to 50 mm. Actual values depend on delivery condition (N or TMCP). Specimens are taken in the transverse direction for plates. For coils, longitudinal direction may be used based on agreement.
| Property | Required Value | Unit | Test Conditions |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 460 | MPa | Transverse, t ≤ 50 mm |
| Tensile Strength (Rm) | 570 - 720 | MPa | Transverse, t ≤ 50 mm |
| Elongation (A) | ≥ 17 | % | Gauge length 5.65√S₀, transverse, t ≤ 50 mm |
| Charpy V-notch Impact Energy (KV) | ≥ 31 (longitudinal average) | J | -40 °C, average of 3 specimens, minimum single 22 J |
| ≥ 24 (transverse average) | J | -40 °C, average of 3 specimens, minimum single 17 J | |
| Bend Test | No cracks or defects | 180° bend, former diameter = 3t (t = specimen thickness) for steel strength level |
LR EH46 Shipbuilding Steel Coil Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | IACS (International Association of Classification Societies) | H46/EH46 | EH46 as defined in IACS UR W11 for high strength steels |
| USA | ABS (American Bureau of Shipping) | EH46 | Fully equivalent per IACS |
| France | BV (Bureau Veritas) | EH46 | Fully equivalent per IACS |
| Norway/Germany | DNV (Det Norske Veritas) | EH46 | Fully equivalent per IACS |
| China | CCS (China Classification Society) | EH46 | Fully equivalent per IACS |
| South Korea | KR (Korean Register) | EH46 | Fully equivalent per IACS |
| Japan | NK (Nippon Kaiji Kyokai) | EH46 | Fully equivalent per IACS |
| Italy | RINA (Registro Italiano Navale) | EH46 | Fully equivalent per IACS |
| Russia | RS (Russian Maritime Register of Shipping) | EH46 | Fully equivalent per IACS |
LR EH46 Shipbuilding Steel Coil Application Introduction
LR EH46 steel coil is extensively used in the marine and offshore industry. Its high strength-to-weight ratio allows for lighter structural designs while maintaining safety, and its excellent low-temperature toughness makes it suitable for ice-class vessels and cold climate operations. It can be processed by cutting, bending, welding, and forming into various structural components. Pre-treatment such as shot blasting and shop priming is common to improve corrosion resistance during construction.
Product Applications: Cargo Vessels, Tankers, Container Ships, Icebreakers and Arctic Support Vessels, Naval Ships and Patrol Boats, Offshore Jackets, Decks, and Modules, FPSO (Floating Production Storage and Offloading) Units, Jack-up Rigs and Semi-submersibles, Bridge Structures (for floating bridges, etc.)
Processed into products: Hull Shell Plating, Deck Plating and Stringers, Bottom and Side Longitudinals, Bulkheads and Stiffeners, Web Frames and Brackets, Transverse Frames and Floor Plates, Hatch Covers and Coamings, Offshore Platform Legs and Bracings, Crane Pedestals and Boom Restructures, Foundation Plates for Heavy Machinery
Application industries: Shipbuilding, Offshore Oil and Gas, Marine Engineering, Port and Harbor Equipment, Renewable Energy (Offshore Wind)
LR EH46 Shipbuilding Steel Coil Similar or Equivalent Alternative Materials Recommendation
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European | EN 10025-4 | S460ML / S460MLO | Thermomechanical rolled structural steel for offshore structures, minimum yield 460 MPa, good low-temperature toughness (ML at -50°C, MLO at -50°C offshore), similar strength and toughness. |
| European | EN 10025-6 | S460QL / S460QL1 | Quenched and tempered structural steel, min yield 460 MPa, suitable for heavy plate and cold climate applications but different delivery condition. |
| USA | ASTM A131 / A131M | EH46 | ASTM specification for structural steel for ships, EH46 grade equivalent to LR EH46. |
| USA | ASTM A945 / A945M | 460 EM / 460 Grade | High-strength low-alloy structural steel with improved weldability for marine applications, similar strength but different low-temperature toughness standard. |
| Japan | JIS G 3106 | SM570 | High-strength rolled steel for welded structures, minimum tensile strength 570 MPa, approximate yield 460 MPa, often used as equivalent but careful match required. |
| China | GB 712 | EH46 | Chinese shipbuilding steel standard, EH46 fully aligned with IACS. |
Notes:
- LR EH46 may be supplied with enhanced toughness options, e.g., E460 or Z-grade for specific applications.
- Careful welding procedures are required; preheating and low-hydrogen electrodes are recommended to avoid cold cracking.
- Conformity is verified through tensile, Charpy impact, and bend tests according to the LR Rules.
- The coil form is typically used for continuous fabrication processes such as welded beams, panels, and ship sections.
- When ordering, specify dimensions, tolerances, surface condition, and desired delivery condition (N or TMCP).
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