Marine grade aluminium alloy plate 5083 h116 with dnv certification

Marine grade aluminium alloy plate 5083 H116 with DNV certification is a high-strength, corrosion-resistant aluminum alloy plate specifically tailored for shipbuilding and offshore applications. It combines excellent seawater corrosion resistance, superior weldability, and high fatigue strength with a DNV-approved manufacturing/control process. Typical uses include hulls, superstructures, decks, offshore platforms, and other marine/ship components where safety, longevity, and reduced weight are critical.

Introduction

Aluminium alloy 5083 is one of the most widely used marine aluminium grades. When produced and tempered to H116 and accompanied by DNV (Det Norske Veritas) certification, this plate becomes a trusted material for commercial and naval vessels, and offshore structures. H116 temper indicates the alloy has been strain-hardened and partially annealed to provide improved toughness and a level of proof strength appropriate for marine applications. DNV certification confirms compliance with maritime industry standards and quality assurance criteria required by classification societies.

Features

• Excellent corrosion resistance to seawater and marine atmospheres.
• High tensile strength and superior fatigue performance compared with common marine alloys.
• Good weldability using common welding processes (GMAW/MIG, GTAW/TIG, and resistance welding); post-weld mechanical properties remain favorable.
• High ductility and toughness, especially at low temperatures.
• Lower weight compared to steel — reduces vessel weight and improves fuel efficiency.
• DNV certification ensures traceability, quality control, and conformity to marine class rules.
• Suitable for both new builds and repair/retrofit work on ships and offshore structures.

Primary Applications

• Ship hulls (commercial, naval, offshore support vessels)
• Superstructures and decks
• Rigid inflatable boats (RIBs) and smaller aluminium vessels
• Offshore platforms, walkways, and topside structures
• Buoyancy chambers and pontoons
• Corrosion-resistant structural members and stiffened panels
• Cryogenic and low-temperature marine equipment (where specified)

Chemical Composition (wt%)

Note: Values above reflect typical chemistry for 5083 per widely accepted standards (e.g., EN 573 / ASTM specifications). Exact composition may vary slightly by manufacturer and customer-specified limits.

Mechanical Properties (Typical) — Temper H116

Temper Definition and Processing Notes

• H116 is a temper specially defined for marine applications. It indicates the material has undergone strain hardening and stabilizing treatment to provide improved mechanical performance and resistance to cracking after welding.
• Plates supplied in H116 temper are often stabilized by a low-temperature anneal or by natural aging to achieve a specific balance of strength and ductility.
• Welding may lower local strength in heat-affected zones; proper welding controls and DNV-accepted welding procedures should be used. Post-weld treatments or faying surface preparation are recommended where required.

Physical & Thermal Properties

Production Standards & Certification

• Common standards: EN AW-5083 (EN 573 / EN 755 series), ASTM B209/B928 (for plates and sheets), ISO 6361 (for rolled plates).
• DNV certification: Usually provided in the form of material certificates and manufacturer approvals affirming compliance with DNV rules for classification, including traceability of chemical/physical tests, factory QC, heat treatment records, and welding procedure qualifications.
• Typical documentation: EN 10204 3.1 / 3.2 material certificates, mill test reports (MTR), DNV approval letter, welding procedure specifications (WPS), and non-destructive testing (NDT) records if applicable.

Dimensional Range & Supply Forms

Manufacturing capabilities vary—confirm availability with supplier. Thicknesses above ~80–100 mm may be limited and require specialized rolling/forging equipment.

Welding, Fabrication & Surface Treatment

• Welding: GMAW (MIG), GTAW (TIG), and submerged arc welding are commonly used. Use compatible filler metals (e.g., ER5356) recommended for 5xxx series alloys to maintain corrosion resistance and mechanical properties. Follow DNV-approved WPS and pre/post-weld inspection.
• Forming: Good cold formability; bending radius guidelines should follow manufacturer recommendations to avoid cracking. Warm forming may be used for tight radius work.
• Machining: Standard machining practices apply — use sharp tools, control cutting speeds to avoid work hardening.
• Surface treatments: Anodizing, chromate conversion coatings, and protective paints (marine primers/topcoats) are common. Surface cleaning and degreasing prior to coating improves adhesion. For best corrosion control, apply coatings per marine coating system specifications.

Quality Control & Testing

Typical QC tests performed by mills and required for DNV certification:

• Chemical analysis (spectrometry)
• Mechanical testing: tensile tests in longitudinal and transverse directions
• Hardness testing
• Ultrasonic or radiographic inspection for internal defects (on thicker plates)
• Eddy current/surface crack detection where specified
• Flattening and dimensional inspection
• Salt spray tests are sometimes performed for coated samples (not a substitute for real seawater exposure tests)

Advantages vs. Other Marine Alloys

• Compared to 5086: 5083 typically offers slightly higher strength and similar corrosion resistance.
• Compared to 6061: 5083 has superior corrosion resistance in seawater and better weldability without significant loss of mechanical properties after welding; 6061 is heat-treatable and may have higher strength in certain tempers but is not typically preferred for heavy marine structural use.
• Compared to steel: Much lighter, non-ferrous (no rust), and simpler corrosion management (coatings vs. cathodic protection), but has lower absolute stiffness and may require different joining techniques.

Handling, Storage & Safety

• Store flat and supported to prevent bowing or bending.
• Avoid prolonged contact with ferrous materials to reduce risk of galvanic corrosion.
• Protect from excessive dirt/oil prior to surface finishing; keep in dry, covered storage.
• Follow standard EHS precautions for aluminium dust during machining and for welding fumes.

Ordering & Traceability Tips

• Specify grade (5083), temper (H116), required thickness, dimensions, and surface finish.
• Request DNV certification and EN 10204 3.1/3.2 certificates if needed.
• Confirm welding filler metal and WPS compatibility with project specifications.
• For classed vessels, indicate the classification society and any additional documentation required (e.g., mill approval, NDT records).