RINA Grade E500 Shipbuilding Steel Plate
RINA Grade E500 Shipbuilding Steel Plate - High-Strength Marine Steel with 500 MPa Yield
Complete material data for RINA Grade E500 shipbuilding steel plate: chemical composition, mechanical and physical properties, international equivalents, similar materials, and application guide.
Welding, bending, flame cutting, cold forming (with care), machining
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RINA Grade E500 Shipbuilding Steel Plate Introduction
RINA Grade E500 is a high-strength hull structural steel grade certified by the Registro Italiano Navale (Italian Naval Register). It is designed for welded structures in shipbuilding and offshore engineering where a minimum yield strength of 500 MPa and excellent low-temperature toughness are essential. The designation "E" indicates that the steel has guaranteed impact properties at -40 °C, making it suitable for critical structural components in cold environments. Key features include:
- High strength combined with good weldability
- Excellent notch toughness at sub-zero temperatures
- Compliance with IACS unified requirements for high-strength shipbuilding steels
- Availability in various thicknesses and delivery conditions (TMCP, QT, or N)
RINA Grade E500 Shipbuilding Steel Plate Chemical Composition
Typical chemical composition according to RINA rules and IACS UR W31 for E500 grade. The steel is micro-alloyed to achieve high strength and is fully killed with aluminium. Carbon equivalent (CEV) values are controlled to ensure good weldability. Notes:
- CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15
- Maximum CEV increases with plate thickness (e.g. CEV ≤ 0.45% for t ≤ 50 mm)
| Element | Nominal Value (max %) | Remarks |
|---|---|---|
| Carbon (C) | 0.20 | Main strengthening element |
| Silicon (Si) | 0.10 – 0.55 | Deoxidation |
| Manganese (Mn) | 0.90 – 1.70 | Grain refinement and strength |
| Phosphorus (P) | 0.025 | Impurity, kept low |
| Sulfur (S) | 0.025 | Impurity, kept low |
| Aluminium (Al, total) | ≥ 0.015 | Grain refining, deoxidation |
| Niobium (Nb) | ≤ 0.05 | Micro-alloying for grain refinement |
| Vanadium (V) | ≤ 0.10 | Micro-alloying for precipitation hardening |
| Titanium (Ti) | ≤ 0.05 | Grain refinement and nitrogen fixation |
| Copper (Cu) | ≤ 0.35 | Residual element |
| Chromium (Cr) | ≤ 0.20 | Residual/hardening element |
| Nickel (Ni) | ≤ 0.40 | Improves toughness at low temperatures |
| Molybdenum (Mo) | ≤ 0.08 | Residual element |
| Nitrogen (N) | ≤ 0.012 | Stoichiometric with Ti/Al |
RINA Grade E500 Shipbuilding Steel Plate Thermal and Electrical Physical Properties
The following data represent approximate physical properties for E500 grade steel at room temperature unless otherwise stated. Actual values may vary slightly depending on specific heat treatment and production route. Important: thermal expansion and conductivity influence welding and design calculations.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Modulus of elasticity (E) | 205 | GPa | 20 °C, tension |
| Shear modulus (G) | 80 | GPa | 20 °C, torsion |
| Poisson ratio (ν) | 0.3 | – | Elastic range |
| Thermal expansion coefficient (α) | 11.1 x 10⁻⁶ | K⁻¹ | 20–100 °C |
| Thermal expansion coefficient (α) | 12.5 x 10⁻⁶ | K⁻¹ | 20–300 °C |
| Thermal expansion coefficient (α) | 13.9 x 10⁻⁶ | K⁻¹ | 20–500 °C |
| Thermal conductivity (λ) | 52 | W/(m·K) | 20 °C |
| Specific heat capacity (cₚ) | 460 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρₑ) | 0.23 x 10⁻⁶ | Ω·m | 20 °C |
RINA Grade E500 Shipbuilding Steel Plate Mechanical Properties
Tensile and impact properties at room temperature and at -40 °C respectively, in accordance with RINA rules for grade E500. Test orientation: transverse for tensile, longitudinal for impact (unless otherwise agreed). Notes:
- Yield strength (ReH) values depend on plate thickness; for thicknesses above 100 mm, modifications may apply.
- Elongation measured on a gauge length of 5.65√S₀ (A5).
| Property | Minimum / Range | Unit | Test Conditions |
|---|---|---|---|
| Yield strength (ReH) | ≥ 500 | MPa | t ≤ 50 mm, transverse |
| Yield strength (ReH) | ≥ 490 | MPa | 50 < t ≤ 70 mm, transverse |
| Yield strength (ReH) | ≥ 480 | MPa | 70 < t ≤ 100 mm, transverse |
| Tensile strength (Rm) | 610 – 770 | MPa | All thicknesses, transverse |
| Elongation (A5) | ≥ 14 | % | t ≤ 100 mm, transverse |
| Charpy V-notch impact (KV₂, longitudinal) | ≥ 34 (average) | J | -40 °C, longitudinal |
| Charpy V-notch impact (KV₂, longitudinal) | ≥ 24 (single value) | J | -40 °C, longitudinal |
RINA Grade E500 Shipbuilding Steel Plate Fully Equivalent Material Standards and Substitutable Grades
| Country / Region | Standard / Classification Society | Grade | Remarks |
|---|---|---|---|
| International | IACS (Unified Requirement W31) | EH500 | Equivalent high-strength hull steel for shipbuilding |
| Norway | DNV | E500 | Identical toughness and strength requirements |
| USA | ABS | EH500 | EH grade, -40°C impact, same yield level |
| France | BV | E500 | Direct equivalent |
| UK | LR | E500 | Direct equivalent |
| China | CCS | E500 | Chinese classification society equivalent |
| Japan | NK (ClassNK) | KE500 | K designation for low temperature steel, 500 MPa yield |
| Korea | KR | RE500 | Equivalent low-temperature high-strength grade |
RINA Grade E500 Shipbuilding Steel Plate Application Introduction
RINA Grade E500 is primarily used in demanding shipbuilding and offshore structural applications where a combination of high strength, low-temperature toughness, and excellent weldability is required. Typical areas include:
- Longitudinal strength members of container ships and bulk carriers
- Deck and bottom plating of offshore vessels
- Jack-up rig legs and offshore wind turbine transition pieces
- Heavy crane booms and subsea equipment
Product Applications: Hull plates for container ships, bulk carriers, and ice-class vessels, Offshore platform topside modules and jacket structures, Wind turbine monopile transition pieces and towers, Shipboard cranes and heavy-duty lifting frames
Processed into products: Main deck and bottom shell plates, Transverse and longitudinal stiffeners, Bulkhead plates, Leg chords of self-elevating units (jack-ups), High-stress joint plates and brackets
Application industries: Shipbuilding & marine engineering, Offshore oil & gas (fixed and floating platforms), Offshore wind energy, Heavy lifting & transport equipment, Pressure vessel & boiler manufacturing (subject to additional code requirements)
RINA Grade E500 Shipbuilding Steel Plate Similar / Alternative Materials with Comparable Properties
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-6 | S500QL | Quenched and tempered structural steel with 500 MPa yield; welding requires procedure qualification |
| USA | ASTM A514 / A517 | Grade Q | High-yield-strength quenched & tempered alloy steel plate; 690 MPa tensile class but often compared for high strength applications |
| Japan | JIS G3128 | SHY685NS | High yield strength steel for welded structures, yield 685 MPa class; an upgrade alternative |
| Germany | DIN EN 10025-6 | S500Q | Similar to S500QL but without low-temperature impact guarantee; check toughness specification |
Notes:
Welding and fabrication notes:
- Preheating: May be required depending on plate thickness and carbon equivalent; typically 100–150 °C for moderate thicknesses.
- Welding consumables: Low-hydrogen electrodes or wires are essential to prevent cold cracking; matching strength filler metals should be used.
- Post-weld heat treatment (PWHT): Not normally performed; if required, mechanical property verification is necessary.
- Forming: Cold forming is possible within limits; hot forming must respect the original thermo-mechanical history to avoid loss of strength.
- Inspection: Non-destructive testing (UT, RT) is often applied to critical welds; classification society surveyor involvement is mandatory for certified components.
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