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<\/figure>\n\n\n\nChemical Composition of 6011<\/h2>\n\n\n\n
The composition below is the registered limits, which agree across the Aluminum Association registration, EN 573-3 and GB\/T 3190-2020.<\/p>\n\n\n\n Quote the registered limits. Composition data for 6011 does not always match them, so check the chemistry on the mill certificate against this table before you commit. A certificate showing copper at 0.15%, zinc capped at 0.25%, no nickel row, or lead and bismuth at 0.2\u20130.6% was drawn from another alloy or another standard \u2014 ask which one before you accept it.<\/p>\n\n\n\n Lead and bismuth at 0.2\u20130.6% each would make 6011 a free-machining alloy, which it is not. Those additions belong to a different family, and a 6011 datasheet carrying Pb and Bi is describing something else.<\/p>\n\n\n\n Copper is the defining element here, and its effects run in different directions.<\/p>\n\n\n\n Strength \u2014 positive.<\/strong> Copper participates in the age-hardening response alongside Mg\u2082Si, so 6011 reaches higher strength than 6061 in comparable tempers. Reported 6011-T6 tensile strength runs typically 310\u2013360 MPa against 6061-T6 at around 310 MPa.<\/p>\n\n\n\n Corrosion resistance \u2014 negative.<\/strong> Copper in aluminium forms cathodic intermetallic particles and increases susceptibility to pitting and intergranular attack. With roughly twice the copper of 6061, 6011 should not be assumed to be the more corrosion-resistant of the two. For marine exposure, road-salt exposure, or any application where the alloy will be unpainted and wet, 6061 is the safer starting point.<\/p>\n\n\n\n Conductivity \u2014 negative.<\/strong> Alloying elements in solution scatter heat- and charge-carrying electrons. Silicon in solid solution is a strong offender and copper compounds the effect. Given 6011 sits at the top of the silicon range and carries substantial copper, expect conductivity at or below 6061-T6 rather than above it.<\/p>\n\n\n\n Weldability \u2014 needs qualification.<\/strong> Standard Al-Mg-Si practice does not automatically transfer. The higher copper content can affect hot-cracking behaviour, so a procedure qualified on 6061 should be re-qualified rather than assumed valid.<\/p>\n\n\n\n This is why the generic online claim that 6011 is “better for corrosion resistance and cools better than 6061” should not be repeated. On both counts the chemistry points the other way.<\/p>\n\n\n\n 6011 does not enjoy the broad, consistently tabulated property data that 6061 does. Published figures vary by product form \u2014 sheet, extrusion, and tube sources disagree \u2014 so the table below gives indicative commercial values, not specification minimums.<\/p>\n\n\n\n Two caveats worth reading before you use any of these numbers.<\/p>\n\n\n\n First, the spread on T4 is genuinely large. One extruder publishes 6011-T4 at 150 MPa minimum tensile; others publish 230\u2013290 MPa for the same designation. That gap is too wide to design from.<\/p>\n\n\n\n Second, T5 data is scarce. Where 6011-T5 is produced it behaves as expected \u2014 between naturally aged T4 and fully aged T6 \u2014 but reliable published values are hard to find, and it should be specified against a mill declaration rather than a generic chart.<\/p>\n\n\n\n For any structural part, require the mechanical figures on the mill test certificate for the ordered form and thickness. For 6xxx wrought products, properties are normally verified against the applicable product standard \u2014 ASTM B209 for sheet and plate, EN 485-2 in Europe \u2014 but 6011 is not universally listed in every edition, so confirm the governing standard up front.<\/p>\n\n\n\n The two conductivity rows deserve an explanation rather than a number.<\/p>\n\n\n\n 6061-T6 is well established at roughly 167 W\/m\u00b7K for thermal conductivity and around 40% IACS electrically. Because 6011 carries more silicon and substantially more copper, its conductivity should fall at or below those figures. Reported values circulating for 6011 \u2014 commonly 155\u2013175 W\/m\u00b7K \u2014 sit inside or below the 6061 band, which is consistent with that reasoning.<\/p>\n\n\n\n The practical consequence: do not specify 6011 expecting better heat transfer than 6061.<\/strong> If you are designing a radiator, heat sink, or any thermal component and need a measured conductivity figure, ask for it on the mill datasheet. For heat-transfer-driven designs where 6011 is not already mandated, 6063 is the more sensible 6xxx choice at around 201 W\/m\u00b7K.<\/p>\n\n\n\n Comparisons below are aligned by temper and generally against T6 or the closest commercial condition.<\/p>\n\n\n\n Where each one fits:<\/p>\n\n\n\n These three tempers appear constantly in 6011 enquiries, and they are frequently described incorrectly. The definitions below follow standard temper nomenclature.<\/p>\n\n\n\n Three clarifications that matter:<\/p>\n\n\n\n Note that these are heat-treatment tempers. Strain-hardening designations such as O or H18 describe a different mechanism and are not how 6011 is specified in service, even though O is sometimes used as forming stock.<\/p>\n\n\n\n The T4-then-age route is common in automotive work: sheet arrives in T4, gets stamped or formed while formable, then receives artificial aging to reach final properties. If your part follows that path, specify both conditions on the enquiry so the mill supplies the correct incoming state.<\/p>\n\n\n\n Formatura.<\/strong> T4 is the forming condition. Expect good cold formability there, dropping sharply in T6. Bend radii and forming limits are not as widely documented for 6011 as they are for 6061 \u2014 request them for your specific thickness.<\/p>\n\n\n\n Lavorazione a macchina.<\/strong> The age-hardened tempers machine well. T6 produces shorter chips than T4, which tends to be gummier. Standard aluminium tooling and cutting fluids apply.<\/p>\n\n\n\n Saldatura.<\/strong> MIG and TIG welding both work, and the standard Al-Mg-Si filler logic applies: ER4043 where crack resistance and puddle control dominate, ER5356 where higher weld strength or a better anodizing colour match matters. Because of the copper content, do not assume a procedure qualified on 6061 transfers without testing. Remember the heat-affected zone of any heat-treatable alloy softens through overaging, and that loss cannot be recovered by post-weld heat treatment of the joint alone \u2014 design accordingly.<\/p>\n\n\n\n Finitura.<\/strong> 6011 anodizes acceptably, though copper-bearing alloys can show a slightly warmer or less uniform tone than low-copper grades. Where colour consistency is a specification line, run a sample through the actual finishing line before production.<\/p>\n\n\n\n 6011 is a more specialised grade than the alloys it is usually compared to, so confirm form and temper up front:<\/p>\n\n\n\n For most enquiries, the honest comparison is against 6061 or 6082. If 6011 is not already named on your drawing, ask whether the marginal strength gain justifies the made-to-order route and patchier property data. Often it does not.<\/p>\n\n\n\n Documentation requirements are the same as for any certified alloy: a mill test certificate with actual chemical analysis and mechanical results per heat or lot, and third-party inspection arranged on request when the project calls for it.<\/p>\n\n\n\n Go \u2014 specify 6011 when:<\/strong><\/p>\n\n\n\n No-go \u2014 choose something else when:<\/strong><\/p>\n\n\n\n The characterisation to avoid is “aerospace.” 6011 is not an aerospace structural grade, and claims placing it alongside 7075 for aircraft structure are not supported by how the alloy is actually used.<\/p>\n\n\n\n 6011 is a copper-bearing variant within the heat-treatable 6xxx family, and its value is narrow but real: a formed part that needs more aged strength than 6061 delivers, in an environment that is not corrosive. The copper that makes that possible is also what limits it \u2014 corrosion resistance and conductivity both fall below 6061, and the published property record is thinner than anything a designer would accept for 6061. So the decision usually comes down to one question: is 6011 already named on your drawing, or are you choosing it?<\/p>\n\n\n\n We supply 6011 sheet, plate, and coil in T4, T5, and T6, with tube and bar sourced to order, and every order ships with an MTC reporting actual chemical analysis and mechanical results. Tell us the forming sequence at enquiry stage and we will confirm the correct incoming temper.<\/p>\n\n\n\nElemento<\/td> Peso %<\/td><\/tr> Silicio (Si)<\/td> 0.6 \u2013 1.2<\/td><\/tr> Ferro (Fe)<\/td> 1,0 max<\/td><\/tr> Rame (Cu)<\/strong><\/td> 0.4 \u2013 0.9<\/strong><\/td><\/tr> Manganese (Mn)<\/td> 0,8 max<\/td><\/tr> Magnesio (Mg)<\/td> 0.6 \u2013 1.2<\/td><\/tr> Cromo (Cr)<\/td> 0,30 max<\/td><\/tr> Nichel (Ni)<\/td> Famiglia<\/td><\/tr> Zinco (Zn)<\/td> 1.5 max<\/td><\/tr> Titanio (Ti)<\/td> Famiglia<\/td><\/tr> Altri, ciascuno \/ totale<\/td> 0.05 \/ 0.15<\/td><\/tr> Alluminio (Al)<\/td> Equilibrio<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Why the Copper Content Matters<\/h2>\n\n\n\n
Propriet\u00e0 meccaniche in base al trattamento termico<\/h2>\n\n\n\n
Temperamento<\/td> Resistenza a trazione (MPa)<\/td> Carico di snervamento (MPa)<\/td> Allungamento (%)<\/td><\/tr> O (ricotto)<\/td> 85 \u2013 130<\/td> 40 \u2013 80<\/td> 25 \u2013 30<\/td><\/tr> T4<\/td> ~290<\/td> ~140<\/td> ~22<\/td><\/tr> T5<\/td> mid-range between T4 and T6<\/td> mid-range between T4 and T6<\/td> \u2014<\/td><\/tr> T6<\/td> 310 \u2013 360<\/td> 240 \u2013 320<\/td> 8 \u2013 12<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Propriet\u00e0 fisiche<\/h2>\n\n\n\n
Propriet\u00e0<\/td> Valore<\/td><\/tr> Densit\u00e0<\/td> ~2,70 g\/cm\u00b3<\/td><\/tr> Intervallo di fusione<\/td> ~580 \u2013 650 \u00b0C<\/td><\/tr> Coefficiente di dilatazione termica<\/td> ~23.6 \u00d7 10\u207b\u2076 \/\u00b0C (20\u2013100 \u00b0C)<\/td><\/tr> Modulo di elasticit\u00e0<\/td> ~69 GPa<\/td><\/tr> Conducibilit\u00e0 termica<\/td> Not reliably published \u2014 expect at or below 6061-T6<\/td><\/tr> Conducibilit\u00e0 elettrica<\/td> Not reliably published \u2014 expect at or below 6061-T6<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n 6011 vs 6061 vs 6063 vs 6082 vs 7075<\/h2>\n\n\n\n
Lega<\/td> Elemento di lega principale<\/td> Tensile strength (T6)<\/td> Resistenza alla corrosione<\/td> Saldabilit\u00e0<\/td> Utilizzo tipico<\/td><\/tr> 6011<\/a><\/td> Mg 0.6\u20131.2, Si 0.6\u20131.2, Cu 0.4\u20130.9<\/strong><\/td> 310 \u2013 360 MPa<\/td> Good, but below 6061<\/td> Weldable; qualify procedure<\/td> Automotive profiles, bicycle frames, formed structural parts<\/td><\/tr> 6061<\/a><\/td> Mg 0.8\u20131.2, Si 0.4\u20130.8, Cu 0.15\u20130.40<\/td> ~310 MPa<\/td> Molto buona<\/td> Eccellente<\/td> General structural work, marine frames, machine parts<\/td><\/tr> 6063<\/a><\/td> Mg 0.45\u20130.9, Si 0.2\u20130.6<\/td> ~240 MPa<\/td> Molto buona<\/td> Eccellente<\/td> Architectural extrusions, heat sinks, window systems<\/td><\/tr> 6082<\/a><\/td> Mg 0.6\u20131.2, Si 0.7\u20131.3, Mn 0.4\u20131.0<\/td> ~310 \u2013 340 MPa<\/td> Molto buona<\/td> Molto buona<\/td> European structural extrusions, transport<\/td><\/tr> 7075<\/a><\/td> Zn 5.1\u20136.1, Mg 2.1\u20132.9, Cu 1.2\u20132.0<\/td> 500 \u2013 570 MPa<\/td> Povero<\/td> Poor \u2014 not fusion welded in practice<\/td> Aerospace structure, high-load parts<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \n
Understanding T4, T5, and T6<\/h2>\n\n\n\n
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<\/figure>\n\n\n\nTemperamento<\/td> What actually happens<\/td> Result<\/td><\/tr> T4<\/strong><\/td> Solution heat treated, quenched, then naturally aged at room temperature<\/td> Good formability with moderate strength; continues to gain strength over time<\/td><\/tr> T5<\/strong><\/td> Cooled directly from an elevated-temperature shaping process such as extrusion, then artificially aged<\/td> Mid-level strength without a separate solution treatment<\/td><\/tr> T6<\/strong><\/td> Solution heat treated, quenched, then artificially aged at elevated temperature<\/td> Maximum strength for the alloy; lowest formability of the three<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \n
Choosing Between T4, T5, and T6<\/h2>\n\n\n\n
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<\/figure>\n\n\n\nIf the requirement is\u2026<\/td> Specificare<\/td><\/tr> Forming complex shapes before aging<\/td> T4 \u2014 form it, then age to T6 if strength is needed afterwards<\/td><\/tr> A formed part already made from stock, with moderate strength<\/td> T5 \u2014 avoids a separate solution treatment<\/td><\/tr> Maximum structural strength<\/td> T6<\/td><\/tr> Maximum ductility for deep drawing<\/td> O as forming stock, then heat treat<\/td><\/tr> Anything critical, with no drawing requirement<\/td> Ask; do not guess on a specialist grade like this<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Working With 6011<\/h2>\n\n\n\n
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<\/figure>\n\n\n\nAvailability and Sourcing Realities<\/h2>\n\n\n\n
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Go\/No-Go: When to Specify 6011<\/h2>\n\n\n\n
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Where 6011 Is Used<\/h2>\n\n\n\n
Settore<\/td> Applicazione<\/td><\/tr> Automotive<\/td> Body and structural profiles, reinforcement members, trim sections<\/td><\/tr> Bicycle manufacture<\/td> Frame tubes for mid- to high-tier aluminium frames, where the higher copper variant is used to reach greater strength than 6061<\/td><\/tr> Transport and general engineering<\/td> Formed structural parts, brackets, machine guards<\/td><\/tr> Cooling circuits<\/td> Automotive coolant and oil lines where formability and strength are both needed \u2014 specified for mechanical reasons, not superior conductivity<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Vantaggi e Limitazioni in Sintesi<\/h2>\n\n\n\n
Punti di forza<\/td> Limitazioni<\/td><\/tr> Higher aged strength than 6061 in comparable tempers<\/td> Higher copper means reduced corrosion resistance versus 6061<\/td><\/tr> Good formability in T4, allowing form-then-age processing<\/td> Conductivity below 6061, well below 6063 \u2014 not a thermal alloy<\/td><\/tr> Makes available a step above 6061 without moving to 7xxx<\/td> Thin grade: narrower availability, tube and bar usually made to order<\/td><\/tr> Established in bicycle frames and automotive profiles<\/td> Poorly documented properties with wide disagreement between published sources<\/td><\/tr> Standard Al-Mg-Si filler and finishing practice applies<\/td> Procedures qualified on 6061 should be re-qualified rather than assumed<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Conclusione<\/h2>\n\n\n\n