GL A32 Shipbuilding Steel Coil
GL A32 Shipbuilding Steel Coil – High Strength Hull Structural Grade, Properties and Global Equivalents
Comprehensive data sheet for GL A32 shipbuilding steel coil: chemical composition, mechanical and thermophysical properties, international equivalents and application guidance.
Hot rolling, normalizing rolling, thermo-mechanical controlled processing (TMCP), cutting, welding, bending
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GL A32 Shipbuilding Steel Coil Introduction
GL A32 is a high strength hull structural steel grade defined in the rules of Germanischer Lloyd (now DNV GL). It is widely used in shipbuilding and offshore engineering for primary structures such as hull plates, decks and bulkheads. GL A32 offers a minimum yield strength of 315 MPa and good toughness at 0°C, making it suitable for critical load-bearing applications. The steel is typically supplied as hot-rolled coils or plates in normalized or thermo-mechanically controlled processed (TMCP) condition.
- Excellent weldability and formability
- Guaranteed low-temperature impact properties
- Available in a range of thicknesses up to 100 mm
- Meets the requirements of IACS UR W11 and major classification societies
GL A32 Shipbuilding Steel Coil Chemical Composition
The chemical composition complies with IACS UR W11 (Rev.8) and GL Rules for high strength hull structural steel A32. Grain refining elements such as Al, Nb, V or Ti are normally added to achieve the required fine grain size and toughness. Carbon equivalent (CE) may be additionally restricted based on thickness and customer requirements to ensure good weldability.
| Element | Specified Value (max or range) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.18 | Ladle analysis |
| Silicon (Si) | ≤0.50 | |
| Manganese (Mn) | 0.90 – 1.60 | |
| Phosphorus (P) | ≤0.035 | |
| Sulfur (S) | ≤0.035 | |
| Chromium (Cr) | ≤0.20 | Residual element (per GL, optional) |
| Nickel (Ni) | ≤0.40 | Residual element (per GL, optional) |
| Molybdenum (Mo) | ≤0.08 | Residual element (per GL, optional) |
| Copper (Cu) | ≤0.35 | Residual element (per GL, optional) |
| Aluminium (Al, acid soluble) | ≥0.015 | If used as grain refiner |
| Niobium (Nb) | 0.02 – 0.05 | Grain refiner (optional, single or combined) |
| Vanadium (V) | 0.05 – 0.10 | Grain refiner (optional, single or combined) |
| Titanium (Ti) | ≤0.02 | Grain refiner (optional, single or combined) |
| Nitrogen (N) | ≤0.009 | If not aluminum killed |
GL A32 Shipbuilding Steel Coil Thermal and Electrical Physical Properties
The physical properties provided are typical reference values for low-carbon structural steels similar to GL A32. Actual values may vary slightly depending on exact composition and manufacturing process. Data are based on measurements at ambient temperature unless otherwise noted.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Modulus of Elasticity (E) | 206 | GPa | At 20°C |
| Shear Modulus (G) | 80 | GPa | At 20°C |
| Poisson's Ratio (ν) | 0.30 | – | At 20°C |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | 20 – 100°C |
| Thermal Expansion Coefficient (α) | 12.5 | 10⁻⁶/K | 20 – 200°C |
| Thermal Expansion Coefficient (α) | 13.0 | 10⁻⁶/K | 20 – 300°C |
| Thermal Conductivity (λ) | 52 | W/(m·K) | At 20°C |
| Specific Heat Capacity (c) | 460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.15 – 0.20 | μΩ·m | At 20°C |
GL A32 Shipbuilding Steel Coil Mechanical Properties
Mechanical properties are specified according to IACS UR W11 and GL rules for A32 grade. Testing is performed on transverse (or longitudinal) test pieces. Impact test temperature for A32 is 0°C. Values apply to thicknesses up to 100 mm. Bending tests are performed with 180° bend angle.
| Property | Specified Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH, min.) | 315 | MPa | Thickness ≤ 50 mm |
| Yield Strength (ReH, min.) | 315 | MPa | 50 mm < Thickness ≤ 70 mm |
| Yield Strength (ReH, min.) | 315 | MPa | 70 mm < Thickness ≤ 100 mm |
| Tensile Strength (Rm) | 440 – 590 | MPa | All thicknesses |
| Elongation (A5, min.) | 22 | % | Thickness ≤ 50 mm; gauge length 5.65√So |
| Elongation (A5, min.) | 22 | % | 50 mm < Thickness ≤ 70 mm |
| Elongation (A5, min.) | 22 | % | 70 mm < Thickness ≤ 100 mm |
| Charpy Impact Energy (KV2, min.) | 34 (average) | J | Longitudinal; at 0°C; thickness ≤ 50 mm |
| Charpy Impact Energy (KV2, min.) | 34 (average) | J | Longitudinal; at 0°C; 50 mm < thickness ≤ 70 mm |
| Charpy Impact Energy (KV2, min.) | 34 (average) | J | Longitudinal; at 0°C; 70 mm < thickness ≤ 100 mm |
| Charpy Impact Energy (KV2, min.) | 24 (single) | J | Individual min. value at 0°C |
| Bend Test (180°, diameter) | 2a | – | Thickness ≤ 25 mm (a = specimen thickness) |
| Bend Test (180°, diameter) | 3a | – | 25 mm < thickness ≤ 50 mm |
| Bend Test (180°, diameter) | 4a | – | 50 mm < thickness ≤ 100 mm |
GL A32 Shipbuilding Steel Coil Fully Equivalent Grades from Other Classification Societies
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | IACS UR W11 | A32 | Base standard for all major classification societies |
| United Kingdom | Lloyd's Register (LR) Rules | LR A32 | Identical mechanical and chemical properties |
| USA | American Bureau of Shipping (ABS) Rules | ABS A32 | Direct equivalent; same requirements |
| France | Bureau Veritas (BV) Rules | BV A32 | Direct equivalent; meets IACS W11 |
| Norway/Germany | DNV Rules (formerly DNV GL) | DNV A32 | GL A32 merged into DNV rules; identical grade |
| Japan | Nippon Kaiji Kyokai (NK) Rules | NK A32 | Equivalent hull structural steel |
| China | China Classification Society (CCS) Rules | CCS A32 | Equivalent; widely used in Chinese shipyards |
| South Korea | Korean Register (KR) Rules | KR A32 | Fully equivalent Korean class standard |
| Italy | Registro Italiano Navale (RINA) Rules | RINA A32 | Equivalent to GL A32 in all respects |
| Russia | Russian Maritime Register of Shipping (RS) Rules | RS A32 | Russian equivalent under IACS requirements |
GL A32 Shipbuilding Steel Coil Application Introduction
GL A32 steel is purpose-built for marine and offshore structural applications where high strength, reliable toughness and good weldability are required. The material is class-approved and traceable. Typical delivery forms include coils, plates and cut-to-length sheets, which are fabricated into final components by cutting, forming, welding and machining.
Product Applications: Hull shell plates and stiffeners, Main deck and strength deck plates, Bulkheads and tank boundaries, Transverse frames and longitudinal girders, Hatch coamings and crane pedestals, Offshore module support structures
Processed into products: Ship hull plates (longitudinal and transverse), Deck plating with welded attachments, Watertight bulkhead stiffeners, Container ship cell guides (if approved by class), Bracket plates and floor plates, Engine room structures and seatings
Application industries: Shipbuilding (commercial vessels, passenger ships, naval), Offshore oil & gas (jack-up legs, platform structures, FPSO modules), Marine equipment and port machinery, Barge and inland waterway construction, Renewable energy (offshore wind turbine substructures)
GL A32 Shipbuilding Steel Coil Similar and Alternative Steel Grades for Related Applications
| Country/Region | Standard / Grade | Typical Designation | Remarks |
|---|---|---|---|
| Europe | EN 10025-2:2019 | S355J2+N | Thermo-mechanically rolled structural steel with min. 355 MPa yield; similar strength but different toughness and test requirements; not directly approved for marine classed structures without additional testing |
| International | IACS UR W11 | AH32 | Same strength level but lower impact test temperature (0°C, same as A32); actually many class societies consider A32 and AH32 nearly identical; check specific class rules |
| International | IACS UR W11 | DH32 | Higher toughness at -20°C; can substitute A32 where better low-temperature performance is required |
| International | IACS UR W11 | EH32 | Even higher toughness at -40°C; for cold climate applications |
| International | IACS UR W11 | A36 | Higher strength grade (min. yield 355 MPa); can be a lightweight alternative if class approved |
Notes:
Note: The data provided is based on publicly available rules and IACS UR W11 (Rev.8 2016). For specific project requirements, the applicable edition of GL Rules (now DNV rules) and any supplementary specifications from the classification society must be consulted. Welding consumables should be selected in accordance with approved welding procedures for A32/AH32 steels. Corrosion allowance and additional through-thickness (Z35) properties may be specified by the buyer and are not covered by the basic A32 grade certification.
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