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Address: 2, Reading Road,
Edison New Jersey, USA -
Address: 2, Reading Road,
Edison New Jersey, USA
We are a leading manufacturer, exporter, and supplier of 5251 Aluminium Round Bars, supplying buyers across the USA, UK, Europe, Middle East, Southeast Asia, and Africa. Our 5251 Aluminium Round Bars are available in multiple tempers, custom diameters, and lengths — backed by full EN 755 and ASTM B221 certification, mill test reports, and competitive export pricing.
Also known as Aluminum 5251 Round Bar, this medium-strength, non-heat-treatable alloy is widely specified for marine, automotive, architectural, and general fabrication applications requiring excellent corrosion resistance and good cold formability.
Aluminium alloy 5251 is a medium-strength alloy with good ductility and formability. It work-hardens rapidly and is readily weldable, with high corrosion resistance in marine environments. The 5251 alloy belongs to the 5xxx aluminium-magnesium series, containing nominally 2.0% magnesium and 0.30% manganese.
It has good workability, medium static strength, high fatigue strength, good weldability, and very good corrosion resistance — especially in marine atmospheres. In round bar form, 5251 is used wherever a lightweight, corrosion-resistant bar is needed that can be easily formed, welded, and machined without losing its mechanical properties.
Strain-hardened and partially annealed — provides a good balance of strength and formability. Most commonly specified temper for marine and structural applications.
Higher strength than H22 with slightly reduced formability. Ideal for applications requiring greater mechanical resistance such as vehicle panels and transport structures.
Highest strength among the strain-hardened tempers. Used where maximum hardness is required while maintaining non-heat-treatable properties.
Fully annealed for maximum ductility and formability. Preferred for applications requiring extensive cold working or deep drawing.
As-fabricated temper — suitable for general structural applications where exact temper properties are not critical.
| Element | Content (%) |
|---|---|
| Aluminium (Al) | Balance |
| Magnesium (Mg) | 1.70 – 2.40 |
| Manganese (Mn) | 0.10 – 0.50 |
| Iron (Fe) | Max 0.50 |
| Silicon (Si) | Max 0.40 |
| Copper (Cu) | Max 0.15 |
| Zinc (Zn) | Max 0.15 |
| Chromium (Cr) | Max 0.15 |
| Titanium (Ti) | Max 0.15 |
| Property | H22 | H24 | O (Annealed) |
|---|---|---|---|
| Tensile Strength (MPa) | 190 | 210 | 160 |
| Yield Strength (MPa) | 130 | 160 | 70 |
| Elongation (%) | 8 | 5 | 18 |
| Brinell Hardness (HB) | 53 | 60 | 45 |
| Shear Strength (MPa) | 120 | 130 | 100 |
| Fatigue Strength (MPa) | 90 | 95 | 85 |
| Property | Value |
|---|---|
| Density | 2.69 g/cm³ |
| Melting Range | 607 – 650°C |
| Thermal Conductivity | 138 W/m·K |
| Electrical Conductivity | 30% IACS |
| Elastic Modulus | 70 GPa |
| Property | Details |
|---|---|
| Grade | Aluminium Alloy 5251 (UNS A95251) |
| Tempers Available | H22, H24, H26, H112, O |
| Diameter Range | 3mm – 500mm |
| Length | 1000mm – 6000mm (custom cut available) |
| Manufacturing Method | Extruded / Cold drawn |
| Surface Finish | Mill finish, Bright, Anodised |
| Standards | EN 755-2, BS EN 515, ASTM B221, AMS 4069 |
| Equivalent Grades | UNS A95251, EN AW-5251, AlMg2Mn0.3, 3.3525 |
The corrosion resistance of 5251 in marine atmospheres is excellent — exceeding that of 5005 — making it a popular choice for marine applications such as small boats, dinghies, and offshore platforms. Round bars in this grade are used for shafts, fittings, handrails, and structural components on vessels.
5251 aluminium round bars are frequently employed in applications that require high strength and excellent machinability. In the automotive sector, they are specified for vehicle body frames, panel supports, fuel system components, and lightweight structural brackets.
In the construction industry, 5251 aluminium is commonly used in roofing systems, curtain walls, window and door frames, decorative panels, rainwater gutters, and shading systems. Its good formability and anodising effect make it both practical and decorative, particularly for modern lightweight architectural designs.
Although not a primary aerospace structural alloy, 5251 aluminium is used to manufacture non-structural supporting components on light-load aircraft, owing to its good fatigue strength, formability, and corrosion resistance.
Typical general-purpose applications include boats, panelling and pressings, marine structures, aircraft parts, vehicle panels, furniture tubing, silos, and containers — wherever a medium-strength, easily worked, corrosion-resistant bar is specified.
| Standard | Scope |
|---|---|
| EN 755-2 | European standard for extruded round bars |
| BS EN 515 | Temper designations for wrought aluminium |
| ASTM B221 | US standard for extruded bars and rods |
| AMS 4069 | Aerospace material specification |
| UNS A95251 | Universal numbering system designation |
| DIN 3.3525 | German equivalent designation |
All 5251 Aluminium Round Bars are supplied with: Mill Test Report (MTR) · Chemical Composition Certificate · Dimensional Inspection Report · Third-party Inspection (on request) · Certificate of Origin for export.
5251 aluminium round bars are used across marine, automotive, construction, and aerospace industries. Key applications include boats, panelling and pressings, marine structures, aircraft parts, vehicle panels, furniture tubing, silos, and containers. The alloy is preferred wherever medium strength combined with excellent corrosion resistance and good cold formability is required.
Yes. 5251 aluminium has very good corrosion resistance and can be used in normal, industrial, and marine environments without problems. It is best suited for offshore applications. In round bar form, it is widely used for marine shafts, fittings, and structural connections.
Both are strain-hardened tempers. H22 is partially annealed, offering better formability and moderate strength (190 MPa tensile). H24 provides higher tensile strength (210 MPa) with slightly less ductility. Choose H22 for forming operations and H24 for higher-strength structural use.
Yes. 5251 is a readily weldable alloy. The recommended filler wire is 5356 when welding 5251 to itself, 6xxx series alloys, 7xxx series alloys, and most other 5xxx alloys. MIG and TIG welding processes are both suitable.
5251 aluminium round bars are covered under EN 755-2 (European), ASTM B221 (USA), and AMS 4069 for aerospace applications. The UNS designation is A95251 and the DIN equivalent is 3.3525.
Yes. Every order is supplied with full material certification including mill test report, chemical composition certificate, mechanical properties report, and heat number traceability. Third-party inspection certificates are available on request.
Looking for a trusted 5251 Aluminium Round Bar manufacturer, exporter, and supplier? We supply 5251 round bars in all tempers and custom sizes with full EN 755 and ASTM B221 certification, competitive pricing, and reliable worldwide delivery. Contact us today for a free quote and lead time confirmation.
+91 95166 18000
support@aluminiumtubes.org