RINA Grade E Shipbuilding Steel Coil
RINA Grade E Shipbuilding Steel Coil - Properties, Equivalents & Marine Applications
Detailed data for RINA Grade E shipbuilding steel coil: chemical composition, mechanical and thermal properties, full international equivalents (ABS, DNV, LR, ASTM A131), similar materials, and application guide for marine structural components.
Hot rolling, normalizing, welding, cutting, cold forming, bending
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RINA Grade E Shipbuilding Steel Coil Introduction
RINA Grade E is a normal strength hull structural steel specified by the Italian Classification Society (Registro Italiano Navale) under its Rules for the Classification of Ships. It offers a minimum yield strength of 235 MPa, good weldability, and excellent notch toughness at low temperatures, achieved through fine grain practice with aluminum addition. The steel is typically supplied as hot-rolled coil or plate and is intended for critical structural parts of seagoing vessels, particularly those exposed to cold service conditions.
- Impact tested at -40 °C (27 J minimum)
- Fully killed and fine-grain treated
- Suitable for cold-climate ship construction
RINA Grade E Shipbuilding Steel Coil Chemical Composition
The chemical requirements are based on IACS UR W11 (Normal Strength Hull Structural Steel) as adopted by RINA. Aluminium is mandatory to ensure fine grain size and sufficient low-temperature toughness. Residual elements such as copper, chromium, nickel, and molybdenum are limited by good manufacturing practice but are not individually specified.
| Element | Standard Value | Remarks |
|---|---|---|
| C | ≤ 0.18 | Maximum allowed for Grade E |
| Mn | ≥ 0.70 | Minimum; must also be ≥ 2.5 × C if Al insufficient |
| Si | ≤ 0.35 | Deoxidation element, upper limit |
| P | ≤ 0.035 | Maximum phosphorus content |
| S | ≤ 0.035 | Maximum sulfur content |
| Al (acid soluble) | ≥ 0.015 | Required for fine grain practice and toughness |
RINA Grade E Shipbuilding Steel Coil Thermal and Electrical Physical Properties
Physical properties are typical for carbon-manganese structural steel and are not mandatory specification requirements. Actual values may vary slightly with exact composition, manufacturing route, and heat treatment condition.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Elastic modulus (E) | 210 | GPa | At 20 °C |
| Shear modulus (G) | 81 | GPa | At 20 °C |
| Poisson's ratio (ν) | 0.3 | — | At 20 °C |
| Thermal expansion coefficient (α) | 12.0 | 10⁻⁶/K | Between 20 °C and 100 °C |
| Thermal conductivity (λ) | ~50 | W/(m·K) | At 20 °C |
| Specific heat capacity (c) | ~460 | J/(kg·K) | At 20 °C |
| Electrical resistivity (ρ_e) | ~0.17 | 10⁻⁶ Ω·m | At 20 °C |
RINA Grade E Shipbuilding Steel Coil Mechanical Properties
Tensile and impact properties are specified in RINA Rules Part D Chapter 3 and conform to IACS UR W11 for thicknesses up to 50 mm. Impact test temperature for Grade E is -40 °C. Bend test is required for verification of formability. All values are minimum unless a range is indicated.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | ≥ 235 | MPa | Thickness ≤ 50 mm, transverse or longitudinal |
| Tensile strength (Rm) | 400 – 520 | MPa | Thickness ≤ 50 mm |
| Elongation (A) | ≥ 22 | % | Gauge length 5.65√S0, thickness ≤ 50 mm |
| Charpy V-notch impact (KV) | ≥ 27 | J | At -40 °C, longitudinal, 10×10 mm specimen |
| Bend test (mandrel diameter) | d = 2t | — | 180° bend, thickness ≤ 25 mm |
| Bend test (mandrel diameter) | d = 3t | — | 180° bend, thickness 25 mm < t ≤ 50 mm |
RINA Grade E Shipbuilding Steel Coil Fully Equivalent Material Standards and Replacement Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | IACS UR W11 | Grade E | Unified requirements applied by all member classification societies |
| USA | ASTM A131 / A131M | Grade E | Identical chemical and toughness requirements ( -40 °C Charpy) |
| USA | ABS Rules | ABS Grade E | American Bureau of Shipping |
| Norway | DNV Rules | DNV Grade E | Det Norske Veritas |
| UK | LR Rules | LR Grade E | Lloyd's Register |
| France | BV Rules | BV Grade E | Bureau Veritas |
| China | CCS Rules | CCS Grade E | China Classification Society |
| Japan | NK Rules | NK Grade E | ClassNK (Nippon Kaiji Kyokai) |
| South Korea | KR Rules | KR Grade E | Korean Register |
RINA Grade E Shipbuilding Steel Coil Application Introduction
RINA Grade E is specifically designed for welded structures in shipbuilding and offshore engineering where reliable toughness at sub-zero temperatures is required. It is commonly used in hull envelopes, internal structures, and cold-climate marine equipment. The steel offers good weldability with conventional shipbuilding consumables and can be formed, cut, and welded without preheating at moderate thicknesses.
Product Applications: Bulk carriers, Crude oil and product tankers, Container ships, Offshore platform topsides and jackets, Icebreakers and ice-strengthened vessels, LNG / LPG carrier hulls
Processed into products: Hull bottom and side shell plates, Weather deck plates, Longitudinal and transverse bulkheads, Stiffeners (flat bars, bulb profiles, angles), Web frames and stringers, Floor plates and brackets, Rudder and stern frame plates, Keel plates, Hatch coamings
Application industries: Shipbuilding (commercial and naval), Offshore Oil & Gas, Marine and Coastal Engineering, Cold-region Infrastructure
RINA Grade E Shipbuilding Steel Coil Similar / Alternative Materials
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-2 | S235J2 (+N) | Similar strength; impact at -20 °C (27 J). Requires supplementary -40 °C testing for full substitution. |
| Europe | EN 10025-2 | S235J0 | Impact at 0 °C; suitable for non-low-temperature applications only. |
| Japan | JIS G 3106 | SM400B/C | SM400B (0 °C), SM400C (-20 °C). Strength equivalent; toughness is lower. |
| USA | ASTM A36 | A36 | General structural steel; no guaranteed low-temperature toughness. |
| International | ISO 630-2 | E235C | Tensile and yield comparable; impact test at -20 °C, not at -40 °C. |
Notes:
Delivery condition: Usually supplied as hot-rolled coil or plate; normalizing heat treatment may be applied for thicker products to meet toughness requirements.
Weldability: The low carbon equivalent (typically ≤0.38) ensures excellent weldability without preheating for standard thicknesses.
Surface quality: Per EN 10163-2, Class A (repair welding of surface defects permitted).
Certification: All coils are supplied with RINA inspection certificate 3.1 or 3.2 according to EN 10204.
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