Aluminum 6070-T6511
Temper
AA 6070 · UNS A96070 · EN AW-6070, AW 6070
T6511 = t6, stress relieved by stretching, minor straightening
Preferred for extruded bar/shapes that will be heavily machined, since residual stress and distortion are minimized.
Values for the T6511 condition
Other 6070 tempers and conditions
6070 is listed in 6 conditions; see the grade overview at 6070.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for maximum formability before solution treating and aging. | 69 | 145 | 20 | 35 HB | 47 % IACS |
Solution heat treated and naturally aged | Choose when parts must be bent, drawn or formed after heat treatment and later aged to T6. | 172 | 315 | 20 | 90 HB | 39 % IACS |
Cooled from hot working and artificially aged | Economical press-quench temper for extruded shapes where full T6 strength is not required. | 295 | 340 | 11 | 105 HB | 43 % IACS |
Solution heat treated and artificially aged | Standard high-strength condition for structural extrusions, forgings and machined parts. | 350 | 380 | 10 | 120 HB | 44 % IACS |
T6, heat treated by the user | High-strength Al-Mg-Si-Cu extrusion alloy re-solutionized from O/F stock and artificially aged, giving T6-level strength with good weldability. | 350 | 380 | 10 | 120 HB | 44 % IACS |
T6511This page T6, stress relieved by stretching, minor straightening | Preferred for extruded bar/shapes that will be heavily machined, since residual stress and distortion are minimized. | 350 | 380 | 10 | 120 HB | 44 % IACS |
What is 6070-T6511?
6070-T6511 is 6070 in the T6511 temper — preferred for extruded bar/shapes that will be heavily machined, since residual stress and distortion are minimized. 6070-T6511 has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 83% of aluminum grades. Elongation at break is 10% and the elastic modulus is 69 GPa (10 Msi). 6070-T6511 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 566°C (1,051 °F).
Advantages
- High electrical conductivity — 44 % IACS, better than 85% of aluminum grades
- Conducts heat well — 172 W/m·K (99.4 BTU/hr·ft·°F), better than 84% of aluminum grades
- High strength — 350 MPa (50.8 ksi), better than 83% of aluminum grades
6070-T6511 properties
Typical room-temperature values for 6070-T6511; 21 are specific to this condition. Other listed values are 6070 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
6070-T6511 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 566°C (1,051 °F).
Mechanical12
6070-T6511 has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 83% of aluminum grades. Elongation at break is 10% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
6070-T6511 is rated for continuous service to 150°C (302 °F). It conducts heat at 172 W/m·K (99.4 BTU/hr·ft·°F), better than 84% of aluminum grades. Thermal expansion is 23.5 µm/m·K (13.1 µin/in·°F).
Electrical3
6070-T6511 conducts electricity at 44 % IACS, better than 85% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), better than 57% of aluminum grades.
Sustainability4
Producing a kilogram of 6070-T6511 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 30%.
Manufacturability7
6070-T6511's machinability is good (65/100, better than 62% of aluminum grades); weldability very good (70/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 6070-T6511
Is 6070 easy to machine?
Machines cleanly in T6/T6511 with sharp carbide tooling, high speed and flood or mist lubrication; chips are shorter than 6061-T6.
Can 6070 be welded?
Readily GMAW/GTAW welded with 4043 (or 5356 for anodized appearance); HAZ drops toward T4 strength, so post-weld aging or joint design allowance is needed and crater cracking must be avoided.
Can 6070 be formed, bent or molded?
Form, bend and forge in O or T4; T6 material has limited bend radius. Extrusion speeds are lower and press pressures higher than for 6063/6061 because of the Si-Mn-Cu load.
What surface finishes work on 6070?
Takes hard and protective anodize well and accepts chromate/paint systems; clear decorative anodize is slightly darker/off-tint due to Cu and Mn, so match-critical parts should be color-anodized or painted.
6070 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Si | 1 – 1.7 | 1.4 |
| Feimpurity limit | ≤ 0.5 | 0.25 |
| Cu | 0.15 – 0.4 | 0.28 |
| Mn | 0.4 – 1 | 0.7 |
| Mg | 0.5 – 1.2 | 0.8 |
| Cr | ≤ 0.1 | — |
| Zn | ≤ 0.25 | — |
| Ti | ≤ 0.15 | — |
| Others (each)0.15 total | ≤ 0.05 | — |
| Al | balance | — |
6070-T6511 — frequently asked
What is 6070-T6511 used for?
6070-T6511 is typically used for heavy structural extrusions, truck frame rails, heavy forgings, automotive and transport structural members, bicycle and motorcycle components and welded load-bearing frames. In short: heavy section forging alloy.
What is the yield strength of 6070-T6511?
6070-T6511 has a typical yield strength of 350 MPa (50.8 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 83% of aluminum grades. Strength varies by condition: see the 6 listed tempers.
Is 6070-T6511 easy to machine?
Reasonably — machinability is rated good (65/100, better than 62% of aluminum grades). Machines cleanly in T6/T6511 with sharp carbide tooling, high speed and flood or mist lubrication; chips are shorter than 6061-T6.
Can 6070-T6511 be welded?
Yes — weldability is rated very good (70/100). Readily GMAW/GTAW welded with 4043 (or 5356 for anodized appearance); HAZ drops toward T4 strength, so post-weld aging or joint design allowance is needed and crater cracking must be avoided.
What surface finishes work on 6070-T6511?
Takes hard and protective anodize well and accepts chromate/paint systems; clear decorative anodize is slightly darker/off-tint due to Cu and Mn, so match-critical parts should be color-anodized or painted.
Can 6070-T6511 be formed, bent or molded?
Form, bend and forge in O or T4; T6 material has limited bend radius. Extrusion speeds are lower and press pressures higher than for 6063/6061 because of the Si-Mn-Cu load.
What is the maximum service temperature of 6070-T6511?
6070-T6511 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in 6070-T6511?
Yes — 6070-T6511 is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum and Wrought Aluminum Alloys (Teal Sheets) — The Aluminum Association (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- EN 573-3 Aluminium and aluminium alloys — Chemical composition of wrought products — CEN (2019)
- ASTM B221 Standard Specification for Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes — ASTM (2021)
- Wrought aluminium alloy property records (6070-O / T4 / T6) — MatWeb / ASM Alloy Center (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.