Aluminum 7005-T73
Temper
AA 7005 · UNS A97005 · EN AW-7005, AW 7005
T73 = solution heat treated and overaged for stress-corrosion resistance
Over-aged variant traded ~10–15 % strength for markedly better stress-corrosion and exfoliation resistance in marine/humid service.
Values for the T73 condition
Other 7005 tempers and conditions
7005 is listed in 8 conditions; see the grade overview at 7005.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest condition, chosen for severe bending/forming or deep drawing before a later solution treatment and age. | 85 | 195 | 20 | 45 HB | 45 % IACS |
As-welded HAZ (naturally re-aged 30 days) | Design condition for welded 7005 structures — HAZ recovers a large part of parent strength by natural aging without post-weld heat treatment. | 205 | 290 | 10 | 78 HB | 42 % IACS |
T73This page Solution heat treated and overaged for stress-corrosion resistance | Over-aged variant traded ~10–15 % strength for markedly better stress-corrosion and exfoliation resistance in marine/humid service. | 255 | 310 | 14 | 85 HB | 44 % IACS |
Cooled from hot working and artificially aged | Press-quenched and aged: cheapest route to near-T6 strength in thin-wall 7005 extrusions with less distortion. | 285 | 330 | 12 | 90 HB | 40 % IACS |
Solution heat treated and artificially aged | Standard stocked condition: full precipitation strength for welded frames, structural extrusions and machined brackets. | 295 | 350 | 12 | 94 HB | 40 % IACS |
Solution treated, stress-relieved by stretching, aged | Stretch-relieved extruded profiles for machined parts where residual-stress distortion must be minimized. | 300 | 350 | 11 | 95 HB | 40 % IACS |
T6, stress relieved by stretching, minor straightening | Same as T6510 but with allowance for minor straightening — usual condition for long precision bar and profile stock. | 300 | 350 | 11 | 95 HB | 40 % IACS |
Press quenched, over-aged/stabilized | Proprietary two-step age used on welded bicycle and sports frames — highest 7005 strength with improved SCC stability after welding. | 345 | 393 | 15 | 105 HB | 41 % IACS |
What is 7005-T73?
7005-T73 is 7005 in the T73 temper — over-aged variant traded ~10–15 % strength for markedly better stress-corrosion and exfoliation resistance in marine/humid service. 7005-T73 has a yield strength of 255 MPa (37 ksi) and a tensile strength of 310 MPa (45 ksi) — stronger than 67% of aluminum grades. Elongation at break is 14% and the elastic modulus is 72 GPa (10.4 Msi). 7005-T73 has a density of 2.78 g/cm³ (0.1 lb/in³), heavier than 74% of aluminum grades. It melts at 607°C (1,125 °F).
Advantages
- Tough — resists crack growth — 36 MPa·√m (32.8 ksi·√in), better than 93% of aluminum grades
- High electrical conductivity — 44 % IACS, better than 85% of aluminum grades
- Ductile — tolerates forming and impact — 14%, better than 81% of aluminum grades
- Conducts heat well — 160 W/m·K (92.4 BTU/hr·ft·°F), better than 76% of aluminum grades
7005-T73 properties
Typical room-temperature values for 7005-T73; 22 are specific to this condition. Other listed values are 7005 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
7005-T73 has a density of 2.78 g/cm³ (0.1 lb/in³), heavier than 74% of aluminum grades. It melts at 607°C (1,125 °F).
Mechanical13
7005-T73 has a yield strength of 255 MPa (37 ksi) and a tensile strength of 310 MPa (45 ksi) — stronger than 67% of aluminum grades. Elongation at break is 14% and the elastic modulus is 72 GPa (10.4 Msi).
Thermal6
7005-T73 is rated for continuous service to 150°C (302 °F). It conducts heat at 160 W/m·K (92.4 BTU/hr·ft·°F), better than 76% of aluminum grades. Thermal expansion is 23.8 µm/m·K (13.2 µin/in·°F).
Electrical3
7005-T73 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 7005-T73 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 30%.
Manufacturability8
7005-T73's machinability is good (58/100, worse than 54% of aluminum grades); weldability very good (80/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 7005-T73
Is 7005 easy to machine?
Machines well in T5/T6 with sharp polished-flute carbide, high speed and generous coolant; chips are short compared with O temper but material gums if tools dull.
Can 7005 be welded?
Best-weldable 7000 series: GMAW/GTAW with 5356 or 5183 filler, no preheat, HAZ naturally re-ages to ~80 % of parent strength in ~30 days (faster with a 120 °C/24 h post-weld age).
Can 7005 be formed, bent or molded?
Extrudes readily to thin-wall bicycle profiles; cold bending should be done in O or T4-like condition with generous radii, since T6 tube cracks at tight bends.
What surface finishes work on 7005?
Takes clear and hard sulfuric anodize well and is commonly powder-coated; weld beads anodize a different shade, so painted or shot-peened finishes are preferred on welded frames.
7005 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 | ≤ 0.35 | 0.1 |
| Fe | ≤ 0.4 | 0.2 |
| Cukept low for weldability | ≤ 0.1 | 0.03 |
| Mn | 0.2 – 0.7 | 0.4 |
| Mg | 1 – 1.8 | 1.4 |
| Cr | 0.06 – 0.2 | 0.13 |
| Zn | 4 – 5 | 4.5 |
| Ti | 0.01 – 0.06 | 0.03 |
| Zrgrain-structure control | 0.08 – 0.2 | 0.14 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
7005-T73 — frequently asked
What is 7005-T73 used for?
7005-T73 is typically used for bicycle frames and tubing, welded truss and space-frame structures, snowboard and ski cores, truck and trailer structural extrusions, sports equipment tubing and welded chassis and roll structures. In short: weldable mid-strength 7000 series.
What is the yield strength of 7005-T73?
7005-T73 has a typical yield strength of 255 MPa (37 ksi) and a tensile strength of 310 MPa (45 ksi) — stronger than 67% of aluminum grades. Strength varies by condition: see the 8 listed tempers.
Is 7005-T73 easy to machine?
Reasonably — machinability is rated good (58/100, worse than 54% of aluminum grades). Machines well in T5/T6 with sharp polished-flute carbide, high speed and generous coolant; chips are short compared with O temper but material gums if tools dull.
Can 7005-T73 be welded?
Yes — weldability is rated very good (80/100). Best-weldable 7000 series: GMAW/GTAW with 5356 or 5183 filler, no preheat, HAZ naturally re-ages to ~80 % of parent strength in ~30 days (faster with a 120 °C/24 h post-weld age).
What surface finishes work on 7005-T73?
Takes clear and hard sulfuric anodize well and is commonly powder-coated; weld beads anodize a different shade, so painted or shot-peened finishes are preferred on welded frames.
Can 7005-T73 be formed, bent or molded?
Extrudes readily to thin-wall bicycle profiles; cold bending should be done in O or T4-like condition with generous radii, since T6 tube cracks at tight bends.
What is the maximum service temperature of 7005-T73?
7005-T73 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 7005-T73?
Yes — 7005-T73 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)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- Aluminum Standards and Data (mechanical property tables) — The Aluminum Association (2017)
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.