Aluminum 6351-T6511
Temper
AA 6351 · UNS A96351 · EN AW-6351, AW 6351
T6511 = t6, stress relieved by stretching, minor straightening
Same as T6510 but with a small amount of final straightening allowed; the usual stocked temper for precision bar and tube.
Values for the T6511 condition
Other 6351 tempers and conditions
6351 is listed in 11 conditions; see the grade overview at 6351.
Compare all 11 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Slightly strain hardened | Soft, near-annealed 6351 with only incidental strain hardening from handling/straightening — maximum formability, lowest strength. | 70 | 130 | 22 | 35 HB | 50 % IACS |
Annealed | Fully softened condition for maximum bending, drawing or severe forming before re-solution treatment and ageing. | 75 | 150 | 25 | 42 HB | 50 % IACS |
Cooled from hot working and naturally aged | As-extruded 6351 quenched on the press and naturally aged — moderate strength with good ductility and formability before any artificial ageing. | 100 | 180 | 20 | 55 HB | 44 % IACS |
Cooled from hot working, naturally aged, stress relieved by… | T1 press-quenched and naturally aged 6351 that has been straightened/stress relieved, giving T1-level strength with tighter straightness and lower residual stress. | 105 | 185 | 19 | 57 HB | 44 % IACS |
Solution heat treated and naturally aged | Pick when the part must be bent or formed after heat treatment and then aged to T6, or where moderate strength with good ductility is enough. | 150 | 250 | 20 | 65 HB | 40 % IACS |
Cooled from hot working and artificially aged | Press-quenched and aged directly on the extrusion line — cheapest route to near-T6 strength in thin sections with good straightness. | 260 | 295 | 12 | 90 HB | 45 % IACS |
T5, stress relieved by stretching | Use where T5 strength is wanted but residual stress and distortion during machining must be minimised. | 260 | 295 | 11 | 90 HB | 45 % IACS |
Cooled from hot working, cold worked in the die, artificially aged | Specialised press temper for close-tolerance profiles that receive sizing work in the die before ageing. | 265 | 300 | 10 | 92 HB | 45 % IACS |
Solution heat treated and artificially aged | Default structural condition: peak strength with acceptable ductility for extruded frames, tubes, brackets and machined parts. | 285 | 310 | 14 | 95 HB | 44 % IACS |
Solution treated, stress-relieved by stretching, aged, no further… | Choose for long extruded profiles that will be heavily machined and must stay dimensionally stable. | 285 | 310 | 13 | 95 HB | 44 % IACS |
T6511This page T6, stress relieved by stretching, minor straightening | Same as T6510 but with a small amount of final straightening allowed; the usual stocked temper for precision bar and tube. | 285 | 310 | 13 | 95 HB | 44 % IACS |
What is 6351-T6511?
6351-T6511 is 6351 in the T6511 temper — same as T6510 but with a small amount of final straightening allowed; the usual stocked temper for precision bar and tube. 6351-T6511 has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 310 MPa (45 ksi) — stronger than 73% of aluminum grades. Elongation at break is 13% and the elastic modulus is 69 GPa (10 Msi). 6351-T6511 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 555°C (1,031 °F).
Advantages
- Conducts heat well — 176 W/m·K (101.7 BTU/hr·ft·°F), better than 86% of aluminum grades
- High electrical conductivity — 44 % IACS, better than 85% of aluminum grades
- Ductile — tolerates forming and impact — 13%, better than 79% of aluminum grades
6351-T6511 properties
Typical room-temperature values for 6351-T6511; 20 are specific to this condition. Other listed values are 6351 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
6351-T6511 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 555°C (1,031 °F).
Mechanical12
6351-T6511 has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 310 MPa (45 ksi) — stronger than 73% of aluminum grades. Elongation at break is 13% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
6351-T6511 is rated for continuous service to 150°C (302 °F). It conducts heat at 176 W/m·K (101.7 BTU/hr·ft·°F), better than 86% of aluminum grades. Thermal expansion is 23.4 µm/m·K (13 µin/in·°F).
Electrical3
6351-T6511 conducts electricity at 44 % IACS, better than 85% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), better than 67% of aluminum grades.
Sustainability4
Producing a kilogram of 6351-T6511 takes about 210 MJ of energy and emits 12.5 kg of CO₂ — more than 88% of aluminum grades. Typical recycled content is 30%.
Manufacturability8
6351-T6511's machinability is good (65/100, better than 62% of aluminum grades); weldability very good (78/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 6351-T6511
Is 6351 easy to machine?
Machines well in T5/T6 with sharp polished-flute carbide tools, high speed and flood or MQL lubrication; T4/O tempers are gummy and produce built-up edge.
Can 6351 be welded?
Readily GMAW/GTAW welded with 4043 or 5356 filler, but the HAZ over-ages to roughly T4-level strength — design joints for reduced properties or re-heat-treat and age.
Can 6351 be formed, bent or molded?
Extrudes at moderate press speeds (slower than 6063 owing to Mn and Si); bend in O or T4 and age afterwards, since T6 tolerates only generous bend radii.
What surface finishes work on 6351?
Takes clear and hard anodising well and accepts chromate/chrome-free conversion coating, powder coat and paint; the Mn-bearing structure gives a greyer anodic film than 6063.
6351 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 | 0.7 – 1.3 | 1 |
| Mg | 0.4 – 0.8 | 0.6 |
| Mngrain-structure control, distinguishes 6351 from 6061 | 0.4 – 0.8 | 0.6 |
| Fe | ≤ 0.5 | 0.25 |
| Cu | ≤ 0.1 | 0.03 |
| Zn | ≤ 0.2 | 0.05 |
| Ti | ≤ 0.2 | 0.02 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
6351-T6511 — frequently asked
What is 6351-T6511 used for?
6351-T6511 is typically used for pressure pipe, truck rails and cylinders. In short: pressure-tube extrusion.
What is the yield strength of 6351-T6511?
6351-T6511 has a typical yield strength of 285 MPa (41.3 ksi) and a tensile strength of 310 MPa (45 ksi) — stronger than 73% of aluminum grades. Strength varies by condition: see the 11 listed tempers.
Is 6351-T6511 easy to machine?
Reasonably — machinability is rated good (65/100, better than 62% of aluminum grades). Machines well in T5/T6 with sharp polished-flute carbide tools, high speed and flood or MQL lubrication; T4/O tempers are gummy and produce built-up edge.
Can 6351-T6511 be welded?
Yes — weldability is rated very good (78/100). Readily GMAW/GTAW welded with 4043 or 5356 filler, but the HAZ over-ages to roughly T4-level strength — design joints for reduced properties or re-heat-treat and age.
What surface finishes work on 6351-T6511?
Takes clear and hard anodising well and accepts chromate/chrome-free conversion coating, powder coat and paint; the Mn-bearing structure gives a greyer anodic film than 6063.
Can 6351-T6511 be formed, bent or molded?
Extrudes at moderate press speeds (slower than 6063 owing to Mn and Si); bend in O or T4 and age afterwards, since T6 tolerates only generous bend radii.
What is the maximum service temperature of 6351-T6511?
6351-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 6351-T6511?
Yes — 6351-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 (Teal Sheets) — The Aluminum Association (2018)
- EN 755-2 Aluminium and aluminium alloys — Extruded rod/bar, tube and profiles — Mechanical properties — CEN (2016)
- ASTM B221 Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes — ASTM (2021)
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Handbook Vol. 13B: Corrosion — Materials — ASM International (2005)
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.