What Is ASTM B209 5083-H32 Aluminum?
ASTM B209 5083-H32 aluminum is a non-heat-treatable aluminum-magnesium alloy characterized by its moderate strength, excellent corrosion resistance, and outstanding weldability. It is commonly used in marine, transportation, and structural applications where long-term durability and resistance to harsh, corrosive environments are strictly required. Under the ASTM B209 standard, the 5083-H32 temper provides an optimized balance of structural strength, corrosion resistance, and practical formability.
Are you sourcing fully certified ASTM B209 materials for your next fabrication project? Contact GNEE today to request our current stock list and a free Mill Test Certificate (MTC) sample.
Understanding the ASTM B209 Standard and 5083-H32 Temper
For procurement managers and mechanical engineers, understanding the material nomenclature is the first step in ensuring project safety.
What Is ASTM B209?
ASTM B209 is the standard specification for aluminum and aluminum-alloy flat sheet and plate. When a material is certified to ASTM B209, it guarantees strict compliance with international limits for chemical composition, mechanical property testing, and dimensional tolerances.
What Does 5083 Mean?
5083 is a premium marine-grade alloy belonging to the 5000-series family. Its primary alloying element is Magnesium (Mg). Because it contains up to 4.9% magnesium, it achieves significant strength without the need for thermal heat treatment.
What Does the H32 Temper Mean?
"H" indicates that the alloy has been strain-hardened (cold-worked) to increase its strength. The "3" means the metal was strain-hardened and then stabilized through a low-temperature thermal treatment to prevent natural age-softening. The "2" indicates it is "quarter-hard."
5083-H32 Aluminum Chemical Composition (%)
The specific performance of 5083 aluminum is entirely dependent on its precise chemical makeup. The high magnesium content provides structural strength, while trace amounts of manganese and chromium refine the grain structure to prevent stress corrosion.
| Element | Content Limits (%) | Engineering Function |
| Mg (Magnesium) | 4.0 – 4.9 | Primary strengthening agent; enhances weldability. |
| Mn (Manganese) | 0.40 – 1.0 | Increases tensile strength and structural toughness. |
| Cr (Chromium) | 0.05 – 0.25 | Refines grain structure and improves corrosion resistance. |
| Si + Fe | ≤ 0.40 (Combined) | Kept extremely low to prevent brittleness. |
| Ti (Titanium) | ≤ 0.15 | Acts as a grain refiner during casting. |
| Al (Aluminum) | Balance | Base material offering low density. |
5083-H32 Aluminum Mechanical Properties
Engineers rely on mechanical data to determine load-bearing limits. Below are the standard mechanical properties for 5083-H32 plate.
| Mechanical Property | Typical Value | Practical Application |
| Ultimate Tensile Strength | ≈ 275–350 MPa | High resistance to snapping under heavy tension. |
| Yield Strength | ≈ 125–200 MPa | The exact threshold before the plate permanently bends. |
| Elongation at Break | ≥ 10% | Provides the ductility needed for bending and rolling. |
| Density | 2.66 g/cm³ | Significantly lighter than steel, reducing structural weight. |
| Brinell Hardness | ~75 HB | Offers a good balance of wear resistance and tool life. |
Summary Statement: 5083-H32 offers moderate structural strength combined with excellent corrosion resistance, especially when compared to heat-treated alloys like 6061-T6 which are stronger but prone to weld-zone weakness and saltwater pitting.
Core Characteristics of 5083-H32 Aluminum Plate
Why do fabricators consistently choose 5083-H32 over other 5000-series options like 5052? It comes down to four core manufacturing characteristics:
- Excellent Corrosion Resistance: The alloy naturally forms a dense oxide layer that protects it from raw seawater, industrial chemicals, and harsh atmospheric environments. It does not require painting or protective coating for most marine applications.
- Outstanding Weldability: 5083-H32 retains excellent joint strength after welding. Using TIG or MIG processes with 5183 or 5356 filler wire produces highly reliable welds without the catastrophic Heat-Affected Zone (HAZ) strength loss seen in 6000-series aluminum.
- Moderate Strength: It is significantly stronger than 5052-H32, allowing engineers to use thinner plates to achieve the same load-bearing capacity, thus saving weight and material costs.
- Good Formability: Because it is only quarter-hard, 5083-H32 can be cold-formed, pressed, and rolled into cylinders without cracking, making it highly versatile for heavy fabrication.
Stop struggling with brittle materials that crack during bending. Send us your CAD drawings or required bending radius, and our engineers will verify if 5083-H32 is the right fit for your process.
Primary Industry Applications of 5083-H32 Aluminum Plate
Because it offers a unique combination of formability, weldability, and rust prevention, 5083-H32 is often selected when both structural forming and severe corrosion resistance are required simultaneously.
Marine Structures: Internal ship components, boat decks, gangways, and offshore pontoon floats.
Pressure Vessels: Chemical storage tanks, cryogenic LNG tanks, and heavy-duty industrial fluid reservoirs.
Transportation: Tank trucks, railway coal cars, and heavy-duty dump truck beds where weight reduction translates directly into increased payload capacity.
Industrial Structures: Walkways, scaffolding, and staging equipment exposed to harsh weather.
Temper Comparison: 5083 H32 vs H116 vs H321
A common question from buyers is which 5083 temper to choose. While the chemical composition is identical, the temper changes the end-use suitability.
| Temper | Key Feature & Best Application |
| H32 | Provides a balanced mix of strength and formability. Best for tanks, vehicles, and general marine structures where extensive bending/rolling is required. |
| H116 | Engineered specifically to resist exfoliation (flaking) corrosion in seawater. Harder to bend. Best for external ship hulls constantly submerged in saltwater. |
| H321 | Thermally stabilized for marine applications, offering similar corrosion resistance to H116. Often used interchangeably with H116 in shipbuilding based on shipyard preference. |
About GNEE
Located in Henan, China, GNEE is a professional aluminum manufacturer specializing in marine-grade and industrial structural aluminum products.
1. Multi-Alloy & Multi-Specification Supply (Our Core Advantage)
We understand that modern industrial fabrication requires a diverse bill of materials. You might need 5083-H32 plates for tank bodies and 6061-T6 structural tubes for the supporting framework.
Supported Alloys: 5083, 5086, 5052, 6061, 6063, 7075.
Supported Tempers: H32, H116, H321, H111, T6, and O.
Product Categories: Plates, sheets, coils, tubes, and extruded profiles.
GNEE strongly supports multi-grade and multi-specification combined orders. This enables our customers to source entirely different alloys, thicknesses, and sizes in one single shipment. This unique capability eliminates the burden of meeting massive single-item minimum order quantities (MOQs), drastically reducing your inventory pressure and logistics costs.
2. Advanced Production & Strict Quality Control
Our facility utilizes advanced continuous casting and heavy hot-rolling equipment to guarantee superior plate flatness and dimensional accuracy.
Every batch is strictly inspected and shipped with a compliant EN 10204 3.1 Mill Test Certificate (MTC).
We openly welcome third-party inspections (such as SGS, BV, or DNV) prior to container loading to ensure total peace of mind.
3. Seaworthy Export Packaging & Delivery
Ocean freight can destroy improperly packed aluminum through condensation (white rust) and friction. GNEE utilizes a zero-compromise packaging standard:
Materials are protected with VCI (Volatile Corrosion Inhibitor) wrap and waterproof kraft paper.
Plates are secured onto heavy-duty, ISPM-15 fumigated seaworthy wooden pallets.
Bundles are bound with high-tension steel strapping and edge protectors.
Fast delivery turnaround: Custom production orders are reliably dispatched within 7 to 25 days.
Ready to consolidate your procurement and lower your material costs? Send your complete material list to GNEE today for a comprehensive mixed-order quotation within 24 hours.