Henan Gnee New Material Co., Ltd. is one of the most reliable manufacturers and suppliers of EN-AW 5083 Aluminium Round Bar in China. With abundant experience, we warmly welcome you to wholesale high quality EN-AW 5083 Aluminium Round Bar in stock here from our factory. Good service and reasonable price are available.
What is EN-AW 5083 Aluminium Round Bar
But a 5083 round bar sold as marine-grade H116 that is actually soft O loses the stabilized corrosion resistance a hull bracket depends on-and a structural member then corrodes where you cannot see it. Likewise, a 5xxx bar welded with ER4043 filler (the default on many 6xxx jobs) loses joint strength and risks cracking. We confirm temper by tensile plus hardness and confirm grade by XRF before the bar leaves the plant, not by the label. Contact now with your diameter, length, and temper (O, H111, H112, H116, or H321), and we will quote with the mill test certificate and current lead time.
EN-AW 5083 is an aluminum-magnesium alloy in the 5000 series, also written as AlMg4.5Mn under the European EN system and as AA 5083 in the US system. Unlike the 6000-series (6061, 6082) and 7000-series, 5083 is non-heat-treatable: it is not strengthened by solution heat treatment and artificial aging. Its strength comes from magnesium and manganese held in solid solution plus strain hardening (the H tempers), which is why it does not lose strength the way a heat-treated alloy does when welded.
"Round bar" means a continuous, non-hollow cylindrical section supplied as extruded (ASTM B221) or cold-finished / drawn (ASTM B211). 5083 round bar is the structural backbone of marine, offshore, cryogenic, and welded applications precisely because it keeps most of its strength after welding and resists seawater attack without coating.
Chemical Composition
| Element | Min % | Max % | Role / Function |
|---|---|---|---|
| Aluminum (Al) | - | - | Base metal (remainder); provides light weight and the protective oxide film. |
| Magnesium (Mg) | 4.00 | 4.90 | Primary solid-solution strengthener; drives corrosion resistance and weldability. |
| Manganese (Mn) | 0.40 | 1.00 | Refines grain structure, raises strength, improves corrosion behaviour. |
| Chromium (Cr) | 0.05 | 0.25 | Controls recrystallization and improves stress-corrosion resistance. |
| Silicon (Si) | - | 0.40 | Impurity cap; kept low because 5083 is not a precipitation-hardening alloy. |
| Iron (Fe) | - | 0.40 | Impurity; controlled to protect toughness and surface quality. |
| Copper (Cu) | - | 0.10 | Capped low; higher Cu would reduce corrosion and weldability. |
| Zinc (Zn) | - | 0.25 | Impurity cap; kept low to avoid stray strengthening and corrosion risk. |
| Titanium (Ti) | - | 0.15 | Trace grain refiner. |
| Others each / total | - | 0.05 / 0.15 | Residual impurity limits per EN 573-3 / ASTM B221. |
Values are per EN 573-3 and ASTM B221 composition limits for 5083. The high Mg content (4.0–4.9%) is what separates 5083 from the lower-Mg 5052 (2.2–2.8% Mg) and 5086 (3.5–4.5% Mg).
Mechanical Properties
Values below are typical specification minima for extruded / rolled bar per EN 755-2 and ASTM B221 / B211 (room temperature). The actual numbers depend on temper, diameter, and product form - always confirm against the lot MTC.
| Temper | UTS MPa | Yield MPa | Elong % | Hardness HB |
|---|---|---|---|---|
| O / H111 | 275 | 125 | 12–16 | 75 |
| H112 | 275 | 125 | 12 | 75 |
| H116 / H321 (marine, stabilized) | 305 | 215 | 10 | 85 |
| H32 (plate-type temper, bar less common) | 305 | 215 | 10 | 89 |
5083 is the strongest of the non-heat-treatable aluminium alloys. Its yield in the marine tempers (215 MPa) is higher than 5052-H34 (180 MPa) and approaches many 6000-series tempers - without the heat-treat variability. Shear strength is roughly 170 MPa; fatigue strength (rotating beam) about 140 MPa. Use the MTC and governing code for final design.
Physical & Thermal Properties
| Property | Value |
|---|---|
| Density | 2.66 g/cm³ (0.0961 lb/in³) |
| Melting range | Begins to melt ~570 °C (1058 °F); fully liquid near 640 °C (1184 °F) |
| Modulus of elasticity | 72 GPa (10.4×10⁶ psi) |
| Thermal conductivity | 121 W/m·K |
| Electrical conductivity | about 29 % IACS |
| Coefficient of thermal expansion | 25 × 10⁻⁶ /K (13.9 µin/in·°F) |
5083 Aluminium Round Bar Specifications Table
| Parameter | Typical range / value |
|---|---|
| Product form | Solid round bar (rod), extruded or cold-finished / drawn |
| Alloy & temper | EN-AW 5083; O, H111, H112, H116, H321 |
| Diameter | 3–300 mm extruded standard; drawn (cold-finished) 3–120 mm; larger diameters by route |
| Length | Up to 6000 mm standard; cut-to-length per drawing |
| Standards | ASTM B221 (extruded), ASTM B211 (drawn), EN 755, EN 573-3, JIS H4040, GB/T 3191 |
| Diameter tolerance | Per ANSI H35.2(M): extruded "other alloy" ±0.18 mm (6.30–12.50 mm) to ±0.30 mm (25–50 mm); drawn ±0.04 mm (1.6–10 mm) to ±0.08 mm (25–50 mm) |
| Straightness | Per ANSI H35.2(M): 1 mm/m (extruded, except O: 4 mm/m); 2 mm/m (cold-finished) |
| Surface | Mill finish, bright drawn, centreless ground, anodized, powder coated, PVDF |
Heat Treatment & Temper Guide
5083 is non-heat-treatable - there is no solution + artificial-aging cycle (no 530 °C quench / 175 °C age like 6082). Strength is set by composition plus cold work, and the "marine" tempers are stabilized, not precipitation-hardened. The tempers you will actually buy:
O (annealed): fully softened. Full anneal is typically held at 410–430 °C then slow-cooled - softest, with the highest formability and the strongest general corrosion resistance. Confirm the exact cycle against your process spec.
H111: some work hardening from the shaping process, slightly stronger than O, still highly formable.
H112: hot-worked with no special property control - the common, economical extruded-bar temper for structural use.
H116 / H321 (marine, stabilized): strain-hardened and then lightly stabilized at roughly 95–150 °C to keep magnesium in solid solution and suppress β-phase (Al₃Mg₂) precipitation at the grain boundaries. This stabilization is what gives the improved exfoliation and stress-corrosion resistance that marine structures require.
Service-temperature note: 5083 should not be used in sustained service above about 65 °C. Holding it in the 50–200 °C band (sensitization) precipitates β-phase and raises stress-corrosion-cracking risk. For ambient, marine, and cryogenic service it is excellent; for elevated temperature, choose a different alloy.
Equivalent Designations
| AA | UNS | EN | DIN | JIS | GB | ISO |
|---|---|---|---|---|---|---|
| 5083 | A95083 | EN AW-5083 (AlMg4.5Mn) | AlMg4.5Mn (3.3547) | A5083 (JIS H4040) | 5083 (GB/T 3190, GB/T 3191) | AlMg4.5Mn0.7 |
European drawings often call this "AlMg4.5Mn"; German specs use "AlMg4.5Mn (3.3547)". If your document references the old BS or French designation, send it and we will map it to EN-AW 5083 before quoting.
Corrosion Resistance
Atmospheric: Excellent. The natural oxide film protects in rural, urban, and industrial air; 5083 needs no coating for general structural exposure.
Marine / seawater: Excellent - the strongest of the common aluminium alloys in direct seawater. Used for hulls, decks, and submerged structures where 6061/6082 would pit. Pair with paint only in the most aggressive splash zones.
Galvanic: 5083 is anodic to steel, stainless, and copper, so isolate it with dielectric washers or sleeves at bolted joints to avoid sacrificial corrosion. Its marine performance still beats the 6xxx series in direct seawater.
Stress-corrosion cracking (SCC): Low risk in O/H111 and in properly stabilized H116/H321. The hazard appears only if the bar is sensitized by sustained 50–200 °C exposure (β-phase at grain boundaries) - keep service at or below ~65 °C and the risk stays low.
Finishes: Mill finish is sufficient for most marine use. Anodizing on 5xxx gives a grey, less decorative film (limited thickness); powder coat or PVDF is the durable choice for exposed architectural or colored marine members.
Fabrication
Welding. 5083 is one of the most weldable aluminium alloys. For welding 5083 to itself or to another 5xxx of the same sub-group, use filler ER5183 (the closest strength match to the base metal) or ER5356 / ER5556 (high joint strength, good anodized colour match). Do not use ER4043: its 5% silicon drops the weld-joint strength and can promote cracking in high-magnesium 5xxx. The alloy keeps most of its strength through the heat-affected zone, which is why welded 5083 structures carry load without post-weld heat treatment.
Machining. Fair to poor. The high magnesium makes 5083 "gummy" with built-up edge, unlike the free-cutting 6000-series. Use sharp carbide or HSS tools, high surface speed with moderate feed, and generous coolant; expect a poorer surface finish than 6082 and plan for more frequent tool changes. O/H111 machines more easily than the H116/H321 tempers.
Formability. Good in O and H111 - bends and spins cleanly at large radii. Limited in H116/H321 and H32; for heavy forming order O/H111 and strain-harden later if needed.
Quality Control
Risk we are closing: 5083 and 5086 aluminium round bar look identical on the rack, and a bar sold as marine-grade H116 that is actually soft O loses the stabilized corrosion resistance a hull bracket depends on - corrosion then starts where you cannot inspect it. A 5xxx bar welded with the wrong (ER4043) filler cracks at the joint. Diameter oversize eats the machining allowance so the finished part never cleans up.
Action: We run handheld XRF / PMI per lot to confirm the 5083 chemistry (Mg 4.0–4.9, Mn 0.4–1.0, Cu ≤ 0.10) and rule out 5086/5052; we verify the temper by Brinell hardness plus a tensile pull against EN 755-2 / ASTM B221; we measure diameter, ovality, straightness, and length against the drawing and ANSI H35.2(M); we inspect the surface and attach an EN 10204 3.1 MTC.
Standards applied: ASTM B221 / B211 (dimensions, tensile), ASTM E1251 (XRF), ASTM B557 (tensile), ASTM E10 (hardness), EN 755-2 (bar properties), EN 10204 3.1 (inspection document).
Result: every bar leaves grade-true, temper-verified, and on-size - no label-only "marine grade," no surprise at your fabrication shop.
Surface Finishes
| Finish | Process | When to specify |
|---|---|---|
| Mill finish | As-extruded / as-drawn | Structural, welded, or machined-internal use - standard for marine |
| Bright drawn (BD) / Cold finished (CF) | Cold drawn to tight tolerance, bright surface | Precision shafts, bearing seats |
| Centreless ground (CG) | Ground to h8–h9 | Where diameter must be exact |
| Anodized | Electrolytic oxide 5–15 µm (grey tone on 5xxx) | Corrosion + mild decorative exposed members |
| Powder coated / PVDF | Baked colour coating | Architectural, colour-matched marine / exposed structures |
Applications
Marine & shipbuilding: hull frames, decks, superstructures, propeller shafts, and fittings - 5083 is the default marine structural alloy because of seawater corrosion resistance and post-weld strength.
Offshore & oil platforms: corrosion-resistant structural members and walkways exposed to saltwater spray.
Cryogenic & LNG: LNG tank supports and cryogenic equipment - 5083 keeps toughness at very low temperatures without going brittle.
Pressure vessels: welded pressure equipment and storage tanks where 5xxx strength and corrosion resistance are required.
Transportation: truck and trailer bodies, rail-car structures, and tankers - high strength at low weight, fully weldable.
Military & armour: non-sparking, ballistic-resistant structural parts and vehicle hulls.
Welded structures: general fabricated frames and brackets that must resist corrosion without coating.
Desalination & chemical plant: equipment exposed to chloride and mild chemical environments.
EN-AW 5083 vs Other Aluminium Alloy Bar
| Alloy | Temper | UTS MPa | Yield MPa | Elong % | Density | Key use |
|---|---|---|---|---|---|---|
| 5083 | H116/H321 | 305 | 215 | 10 | 2.66 | Marine, cryogenic, welded structures |
| 5086 | H111/H112 | 240–275 | 95–165 | 12–16 | 2.66 | Marine (slightly lower strength) |
| 5052 | H34 | 230 | 180 | 10 | 2.68 | Formed sheet / tube |
| 6061 | T6 | 310 | 276 | 12 | 2.70 | General structural, machined |
| 6082 | T6 | 310 | 260 | 8–12 | 2.70 | Structural, highest 6000-series |
| 7075* | T6 | 570 | 505 | 11 | 2.81 | Aerospace ultra-high-strength |
5083 leads on marine corrosion resistance and post-weld strength among these grades; it trades away some machinability and elevated-temperature service versus the 6xxx series. *7075 is subject to Chinese dual-use export control and GNEE does not export it; for a stronger non-controlled option, 6082 T6 or 6061 T6 is the practical choice.
About GNEE
GNEE has been supplying aluminium mill products since 2008 and now ships to more than 100 countries across marine, offshore, transportation, and industrial markets. We keep common 5083 diameters in stock, support both trial and volume orders with flexible minimum quantities, and quote a standard 15–30 day production lead time. Every order can ship with an EN 10204 3.1 mill test certificate, and our technical team helps you select the right temper (O for forming, H116/H321 for marine structures) and confirm the standard on your drawing before production starts.
Why Choose GNEE
Grade- and temper-true, documented since 2008: every 5083 bar ships with an EN 10204 3.1 MTC documenting chemistry, temper, and dimensions - no label-only "marine grade" reaching your fabrication shop.
Dimensional control per ANSI H35.2(M): diameter, ovality, straightness, and length are measured and recorded against the standard; cold-finished bars hold ±0.04–0.08 mm on small diameters so the part cleans up in one turning pass.
The temper your design calls for: O, H111, H112, H116, or H321, plus cut lengths and non-standard diameters to your drawing - we supply the stabilized marine tempers, not just stock O.
Welding-ready supply: we flag the correct filler (ER5183 / ER5356) for your 5083 job and avoid ER4043 mismatches that weaken joints.
Export packaging & lead time: waterproof wrap, bundle strapping, end protection, and seaworthy wooden crates protect the bar surface through long ocean transit; standard 15–30 day lead time with flexible MOQ.
Delivery & Order Process
After you send the drawing or specification, we issue a quote listing alloy (EN-AW 5083), temper (O / H111 / H112 / H116 / H321), exact diameter and length and tolerances, standard (ASTM B221 / B211 / EN 755), surface, packaging, and the 15–30 day lead time. Before production we confirm the sign-off node: you approve the written specification and, where required, a sample, so there is no ambiguity about grade (5083 vs 5086), temper, and diameter. For every lot we run XRF grade verification, tensile-plus-hardness temper check, and dimensional inspection - the same checks described in the QC block above. If any bar fails incoming inspection - wrong grade or temper, out-of-tolerance, or surface defect - we quarantine that lot and ship a replacement from a verified batch; we do not mix suspect material into your order. This is how a 5083 round bar arrives grade-true, on-size, and ready to weld or machine.
FAQ
1. What is the difference between 5083 O/H111 and H116/H321 round bar?
O and H111 are soft, fully corrosion-resistant, and easy to form - the choice for bending, spinning, and parts that will be formed. H116 and H321 are strain-hardened and stabilized marine tempers: higher yield (215 MPa vs 125 MPa) and improved exfoliation / stress-corrosion resistance for hull and offshore structures. They are not heat-treated; they are cold-worked and low-temperature stabilized.
2. Is 5083 aluminium round bar weldable, and which filler should I use?
Yes - it is among the most weldable aluminium alloys and keeps most of its strength through the weld. Use ER5183 (the closest match to the base metal) or ER5356 / ER5556. Do not use ER4043: the silicon in it lowers joint strength and can crack in high-magnesium 5xxx. Tell us your welding process and we will recommend the filler.
3. What diameter and length can you supply?
Standard extruded bar covers 3–300 mm diameter, cold-finished (drawn) 3–120 mm, with larger diameters available by route and [To be confirmed]. Lengths run to 6000 mm, cut-to-length on request. Diameter tolerance follows ANSI H35.2(M): extruded ±0.18 mm (6.30–12.50 mm) up to ±0.30 mm (25–50 mm); drawn ±0.04 mm (1.6–10 mm) to ±0.08 mm (25–50 mm).
4. Which standard applies to 5083 round bar?
Extruded bar: ASTM B221 (US) / EN 755 (Europe) / JIS H4040 / GB/T 3191. Cold-finished / drawn bar: ASTM B211. Composition is per EN 573-3 / ASTM B221. Tell us the standard on your drawing and we will confirm the applicable one and tolerance class.
5. Can you supply MTC and cut to length, and what is the lead time?
Yes. Every order can ship with an EN 10204 3.1 mill test certificate, cut to your specified length, with flexible MOQ and a standard 15–30 day lead time. Send diameter, length, temper, and standard and we will quote.
Hot Tags: EN-AW 5083 Aluminium Round Bar, China EN-AW 5083 Aluminium Round Bar manufacturers, suppliers, factory, 1060 Aluminum Round Bar, Industrial Aluminum Round Rods, polished aluminum rod 6063