Choosing Corrosion-Resistant Alloys for Marine Hardware
Saltwater hardware needs a review of crevices, flow, load and maintenance as well as alloy chemistry.
Mat Grades internal verification confirms source-backed fidelity and data integrity. It does not constitute external certification or guaranteed lot conformity. Read engineering disclaimer →
Representative source rows, qualified by their reported conditions. Inspect the tables below for all values, limits, and source notes.
5083 (EN AW-5083) is the highest-strength non-heat-treatable Al-Mg alloy (4.5% Mg, 0.7% Mn). Highly regarded for exceptional performance in extreme environments, it offers outstanding resistance to seawater, excellent cryogenic toughness, and high as-welded joint efficiency in heavy plate structures.
Source-backed commercial trade name and short designations cataloged in canonical data.
Standard Designations & Applicable Specifications — Semantically classified designations distinguishing primary standard identifiers, commercial trade names, and applicable specification references.
| System | Identifier | Standard System Name | Classification Notes & Provenance |
|---|---|---|---|
| AAPRIMARY | 5083 | Aluminum Association | —Ref: Aalco European Standard Aluminium Alloy Technical Datasheet |
| UNS | A95083 | Unified Numbering System | —Ref: Aalco European Standard Aluminium Alloy Technical Datasheet |
| EN | EN AW-5083 | European Standard | —Ref: Aalco European Standard Aluminium Alloy Technical Datasheet |
| ISO | AlMg4.5Mn0.7 | International Organization for Standardization | —Ref: Aalco European Standard Aluminium Alloy Technical Datasheet |
| Recognized Name / Alias | Classification | Technical Usage & Context |
|---|---|---|
| EN AW-5083 | Commercial Alias | Colloquial or commercial industry synonym |
| Standards Body | Specification Code | Specification Title / Scope | Relationship Type |
|---|---|---|---|
| CEN | EN 485-2 | Aluminium and aluminium alloys - Sheet, strip and plate - Part 2: Mechanical propertiesPRODUCT_SPECIFICATION · Product form: Sheet & Plate | Specification Reference |
| CEN | EN 573-3 | Aluminium and aluminium alloys - Chemical composition and form of wrought products - Part 3: Chemical composition and form of productsPRODUCT_SPECIFICATION | Specification Reference |
Chemical Composition (Weight %) — Elemental limits and values from the cited source. Preserves exact semantic limits (minimums, maximums, and ranges).
| Element | Symbol | Atomic No. | Semantic Basis | Specified Value | Unit | Metallurgical Notes & Qualification | Data Status |
|---|---|---|---|---|---|---|---|
| Magnesium | Mg | 0 | RANGE | 4.00 – 4.90 | wt% | Ref: Aalco Metals Ltd | VERIFIED |
| Manganese | Mn | 0 | RANGE | 0.40 – 1.00 | wt% | Ref: Aalco Metals Ltd | VERIFIED |
| Iron | Fe | 0 | MAXIMUM | ≤ 0.40 | wt% | Ref: Aalco Metals Ltd | VERIFIED |
| Silicon | Si | 0 | MAXIMUM | ≤ 0.40 | wt% | Ref: Aalco Metals Ltd | VERIFIED |
| Chromium | Cr | 0 | RANGE | 0.05 – 0.25 | wt% | Ref: Aalco Metals Ltd | VERIFIED |
| Zinc | Zn | 0 | MAXIMUM | ≤ 0.25 | wt% | Ref: Aalco Metals Ltd | VERIFIED |
| Titanium | Ti | 0 | MAXIMUM | ≤ 0.15 | wt% | Ref: Aalco Metals Ltd | VERIFIED |
| Copper | Cu | 0 | MAXIMUM | ≤ 0.10 | wt% | Ref: Aalco Metals Ltd | VERIFIED |
| Other Elements Each | OE | 0 | EACH | ≤ 0.05 each | wt% | Ref: Aalco Metals Ltd | VERIFIED |
| Other Elements Total | OT | 0 | TOTAL | ≤ 0.15 | wt% | Ref: Aalco Metals Ltd | VERIFIED |
| Aluminum | Al | 0 | REMAINDER | Remainder | wt% | Balance aluminumRef: Aalco Metals Ltd | VERIFIED |
Source-specific physical properties. Test temperatures are shown only where reported.
| Property Parameter | Canonical SI Value | Semantic Basis | Test Temperature / Context Range | Source Raw Reference | Source Reference | Status |
|---|---|---|---|---|---|---|
| Density | 2.65 g/cm³ | TYPICAL | 2.65 g/cm³ | Aalco Metals Ltd | VERIFIED |
Phase change temperatures, thermal conductivity, specific heat, mean coefficients of thermal expansion across standardized temperature ranges, and recommended thermal processing windows.
| Property Parameter | Canonical SI Value | Semantic Basis | Test Temperature / Context Range | Source Raw Reference | Source Reference | Status |
|---|---|---|---|---|---|---|
| Coefficient of Thermal Expansion | 25 µm/(m·K) | TYPICAL | 25.0 µm/(m·K) | Aalco Metals Ltd | VERIFIED | |
| Solidus Temperature | 570 °C | TYPICAL | 570 °C | Aalco Metals Ltd | VERIFIED | |
| Thermal Conductivity | 121 W/(m·K) | TYPICAL | 121 W/(m·K) | Aalco Metals Ltd | VERIFIED |
Contextual Mechanical Properties & Tempers: Engineering strength, ductility, and hardness values grouped by product form, temper, and section thickness. Mechanical properties are contextual and not isotropic averages.
| Product Form | Temper / Condition | Section Size | Tensile (UTS) | Yield Strength | Elongation | Shear Strength | Fatigue Strength | Hardness (Scales Preserved) | Status |
|---|---|---|---|---|---|---|---|---|---|
| Sheet | O / H111 TemperSource values and qualifiersYield Strength (0.2% Proof Stress): ≥ 125 MPa (MINIMUM)Aalco Metals Ltd — mat-phase4c-5083 Mechanical Properties H111 Sheet 0.2mm to 6.3mm Ultimate Tensile Strength: 275–350 MPa (RANGE)Aalco Metals Ltd — mat-phase4c-5083 Mechanical Properties H111 Sheet 0.2mm to 6.3mm | 0.2mm to 6.3mm | 275–350 MPa | ≥ 125 MPa | — | — | — | — | VERIFIED |
| Plate | O / H111 TemperSource values and qualifiersYield Strength (0.2% Proof Stress): ≥ 115 MPa (MINIMUM)Aalco Metals Ltd — mat-phase4c-5083 Mechanical Properties H111 Plate 6.3mm to 80mm Ultimate Tensile Strength: 270–345 MPa (RANGE)Aalco Metals Ltd — mat-phase4c-5083 Mechanical Properties H111 Plate 6.3mm to 80mm | 6.3mm to 80mm | 270–345 MPa | ≥ 115 MPa | — | — | — | — | VERIFIED |
| Plate | O / H111 TemperSource values and qualifiersYield Strength (0.2% Proof Stress): ≥ 110 MPa (MINIMUM)Aalco Metals Ltd — mat-phase4c-5083 Mechanical Properties H111 Plate 80mm to 120mm Ultimate Tensile Strength: ≥ 260 MPa (MINIMUM)Aalco Metals Ltd — mat-phase4c-5083 Mechanical Properties H111 Plate 80mm to 120mm Elongation (A50 mm): ≥ 12 % (MINIMUM)Aalco Metals Ltd — mat-phase4c-5083 Mechanical Properties H111 Plate 80mm to 120mm | 80mm to 120mm | ≥ 260 MPa | ≥ 110 MPa | ≥ 12 % | — | — | — | VERIFIED |
| Sheet | H32 TemperSource values and qualifiersYield Strength (0.2% Proof Stress): ≥ 215 MPa (MINIMUM)Aalco Metals Ltd — mat-phase4c-5083 Mechanical Properties H32 Sheet 0.2mm to 6.0mm Ultimate Tensile Strength: 305–380 MPa (RANGE)Aalco Metals Ltd — mat-phase4c-5083 Mechanical Properties H32 Sheet 0.2mm to 6.0mm Elongation (A50 mm): ≥ 8 % (MINIMUM)Aalco Metals Ltd — mat-phase4c-5083 Mechanical Properties H32 Sheet 0.2mm to 6.0mm | 0.2mm to 6.0mm | 305–380 MPa | ≥ 215 MPa | ≥ 8 % | — | — | — | VERIFIED |
| Sheet | O / H111 TemperSource values and qualifiersHB Hardness: 75 HB (TYPICAL)Aalco Metals Ltd — mat-phase4c-5083 Hardness H111 Sheet 0.2mm to 6.3mm | 0.2mm to 6.3mm | — | — | — | — | — | 75 HB | VERIFIED |
| Plate | O / H111 TemperSource values and qualifiersHB Hardness: 75 HB (TYPICAL)Aalco Metals Ltd — mat-phase4c-5083 Hardness H111 Plate 6.3mm to 80mm | 6.3mm to 80mm | — | — | — | — | — | 75 HB | VERIFIED |
| Plate | O / H111 TemperSource values and qualifiersHB Hardness: 70 HB (TYPICAL)Aalco Metals Ltd — mat-phase4c-5083 Hardness H111 Plate 80mm to 120mm | 80mm to 120mm | — | — | — | — | — | 70 HB | VERIFIED |
| Sheet | H32 TemperSource values and qualifiersHB Hardness: 89 HB (TYPICAL)Aalco Metals Ltd — mat-phase4c-5083 Hardness H32 Sheet 0.2mm to 6.0mm | 0.2mm to 6.0mm | — | — | — | — | — | 89 HB | VERIFIED |
By Mat Grades Editorial Desk · Updated 2026-11-14. Use alongside the specified product standard and supplier certificate.
For 5083 Aluminum, a qualified cutting-speed or tool-life recommendation is not supplied in the available record. A relevant hardness example is HB Hardness: 75 HB (typical; O / H111 Temper, H111, Sheet, 0.2mm to 6.3mm). Use that supplied condition for a trial of the difficult feature. Record tool changes, burr removal, unclamped dimensions and accepted parts per hour. Relative machinability ratings from different reference scales should not be compared as if they were one common test.
No qualified weld procedure, filler selection or preheat/interpass schedule is established by this material record. Obtain a procedure for the actual joint, supplied condition and section rather than copying one from a nearby grade. The first cataloged strength example is Yield Strength (0.2% Proof Stress): minimum 125 MPa (minimum; O / H111 Temper, H111, Sheet, 0.2mm to 6.3mm). Assess the final part after joining or thermal processing. Include distortion, cleanup and inspection in the quotation. A material designation or favorable process rating is a starting point for qualification, not evidence that an untested joint meets the drawing.
Review the finish, moisture traps and contact with other metals before accepting an assembly for service. Alloy, temper and surface treatment answer different questions. A stronger listed condition does not automatically solve corrosion, wear or deflection, and thermal-property data is not a maximum operating-temperature rating. The recorded thermal example is Coefficient of Thermal Expansion: 25 µm/(m·K) (typical; additional condition not stated). State the exposure and inspection access in the design record so that a change of installation or cleaning method triggers a review. The selected composition entries are Mg 4–4.9 wt%, Mn 0.4–1 wt%, Fe maximum 0.4 wt%. Chemistry documents identity; it does not establish fluid compatibility.
Use AA 5083, UNS A95083, EN EN AW-5083 to identify the candidate, then specify the product form and delivered condition separately. A specific component application is not asserted where the source record does not provide one. The listed forms include Sheet, Plate; confirm the actual stock offered by the supplier. Compare the complete route through machining, joining, finish and inspection. Keep the certificate, required test location and acceptance criteria with the first-article record. A later change of grade, condition or source should be assessed against that same requirement.
Technical references: Aalco Metals Ltd
Wrought aluminum alloys grouped under the 5xxx metallurgical series sharing fundamental alloying systems and physical characteristics.
Contextual technical guides explaining degradation mechanisms, testing methodologies, and selection criteria relevant to 5083 Aluminum.
Saltwater hardware needs a review of crevices, flow, load and maintenance as well as alloy chemistry.
Aluminium possesses distinct physical and metallurgical properties—including a tenacious refractory oxide layer that melts at 2,072°C, thermal conductivity five times higher than structural steel, extreme liquid hydrogen solubility, and a lack of visible color change before melting. Successful aluminium-to-aluminium welding requires matching the base alloy series to an appropriate process (AC TIG, pulsed MIG, or SMAW) and compatible filler metal while designing for unavoidable heat-affected zone softening.
Sources & Provenance Trail: Authoritative reference publications, standards specifications, and data registers cited across this material record.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Chemical Composition EN 573-3. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Physical Properties DENSITY. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Physical Properties ELASTIC_MODULUS. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Physical Properties THERMAL_EXPANSION. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Physical Properties SOLIDUS_TEMPERATURE. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Physical Properties THERMAL_CONDUCTIVITY. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Mechanical Properties H111 Sheet 0.2mm to 6.3mm. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Mechanical Properties H111 Plate 6.3mm to 80mm. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Mechanical Properties H111 Plate 80mm to 120mm. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Mechanical Properties H32 Sheet 0.2mm to 6.0mm. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Hardness H111 Sheet 0.2mm to 6.3mm. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Hardness H111 Plate 6.3mm to 80mm. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Hardness H111 Plate 80mm to 120mm. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Hardness H32 Sheet 0.2mm to 6.0mm. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Designation AA 5083. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Designation UNS A95083. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Designation EN EN AW-5083. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Designation ISO AlMg4.5Mn0.7. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Specification EN 485-2. Selected facts only; no decorative text or full standards tables reproduced.
Reviewed factual extraction from Aalco technical datasheets transcribing European standards (EN 573-3, EN 485-2, EN 755-2): mat-phase4c-5083 Specification EN 573-3. Selected facts only; no decorative text or full standards tables reproduced.