Aluminum 7136 T74511
Precip hard
AA 7136 · UNS A97136
T74511 = solution treated, stretched, over-aged between T73 and T76
Balanced temper for thick extrusions and forged-like sections needing good short-transverse SCC performance with near-T76 strength.
Values for the T74511 condition
Other 7136 tempers and conditions
7136 is listed in 6 conditions; see the grade overview at 7136.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest condition, supplied only for further forming or re-heat-treatment; not a structural condition. | 110 | 235 | 16 | 62 HB | 45 % IACS |
Solution heat treated, stress relieved by stretching | Transient as-quenched condition used for forming or straightening before artificial ageing; properties change with time. | 250 | 400 | 16 | 92 HB | 30 % IACS |
Solution treated, stretched, fully over-aged | Choose when maximum stress-corrosion-cracking immunity and toughness are needed, accepting ~8 % lower strength. | 585 | 620 | 12 | 165 HB | 40 % IACS |
T74511This page Solution treated, stretched, over-aged between T73 and T76 | Balanced temper for thick extrusions and forged-like sections needing good short-transverse SCC performance with near-T76 strength. | 605 | 640 | 11 | 170 HB | 38 % IACS |
T76511Default Solution treated, stretched, over-aged for exfoliation resistance | Standard aerospace supply condition for 7136 extrusions — near-peak strength with EXCO-rated exfoliation resistance and improved toughness. | 620 | 655 | 11 | 175 HB | 36 % IACS |
T6, stress relieved by stretching, minor straightening | Highest strength condition of 7136 extrusions; use only where SCC exposure and thick-section toughness are not critical. | 670 | 700 | 9 | 190 HB | 31 % IACS |
What is 7136 T74511?
7136 T74511 is 7136 in the T74511 condition — balanced temper for thick extrusions and forged-like sections needing good short-transverse SCC performance with near-T76 strength. 7136 T74511 has a yield strength of 605 MPa (87.7 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 99% of aluminum grades. Elongation at break is 11% and the elastic modulus is 71 GPa (10.3 Msi). 7136 T74511 has a density of 2.85 g/cm³ (0.103 lb/in³), heavier than 96% of aluminum grades. It melts at 477°C (891 °F). T76511 is the default condition FabDigit quotes; T74511 is available on request or by drawing note.
Advantages
- High strength — 605 MPa (87.7 ksi), better than 99% of aluminum grades
- Tough — resists crack growth — 35 MPa·√m (31.9 ksi·√in), better than 91% of aluminum grades
Limitations
- Difficult to weld — 12/100, worse than 98% of aluminum grades
7136 T74511 properties
Typical room-temperature values for 7136 T74511; 11 are specific to this condition. Other listed values are 7136 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
7136 T74511 has a density of 2.85 g/cm³ (0.103 lb/in³), heavier than 96% of aluminum grades. It melts at 477°C (891 °F).
Mechanical14
7136 T74511 has a yield strength of 605 MPa (87.7 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 99% of aluminum grades. Elongation at break is 11% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
7136 T74511 is rated for continuous service to 140°C (284 °F). It conducts heat at 150 W/m·K (86.7 BTU/hr·ft·°F), better than 58% of aluminum grades. Thermal expansion is 23.4 µm/m·K (13 µin/in·°F).
Electrical3
7136 T74511 conducts electricity at 38 % IACS, better than 61% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (50/100), worse than 56% of aluminum grades.
Sustainability4
Producing a kilogram of 7136 T74511 takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 10%.
Manufacturability7
7136 T74511's machinability is good (67/100, better than 66% of aluminum grades); weldability not recommended (12/100); formability poor (22/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 7136 T74511
Is 7136 easy to machine?
Machines very well in T7x tempers with sharp polished carbide tools, high speed and flood/MQL coolant; produces short chips but requires care with residual-stress distortion on thin machined pockets.
Can 7136 be welded?
Not suitable for fusion welding (Cu-bearing 7000-series hot-cracks and loses HAZ strength) — join by fasteners, adhesive bonding or friction stir welding with post-weld ageing evaluation.
Can 7136 be formed, bent or molded?
Extruded to shape at 380–440 °C; cold forming in T7x is limited to large-radius bends, do severe forming in W or O temper and re-age.
What surface finishes work on 7136?
Chromic or sulfuric anodize, hard anodize, chromate/trivalent conversion coat and epoxy primer are standard; avoid alkaline etch overexposure and use cadmium-free coated fasteners to limit galvanic attack.
7136 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 |
|---|---|---|
| Znprincipal strengthening element | 8.4 – 9.4 | 8.9 |
| Mg | 1.8 – 2.5 | 2.2 |
| Cu | 1.9 – 2.5 | 2.2 |
| ZrAl3Zr dispersoids control recrystallisation | 0.1 – 0.2 | 0.15 |
| Feimpurity limit | ≤ 0.15 | — |
| Siimpurity limit | ≤ 0.12 | — |
| Mn | ≤ 0.05 | — |
| Cr | ≤ 0.05 | — |
| Ti | ≤ 0.1 | — |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
7136 T74511 — frequently asked
What is 7136 T74511 used for?
7136 T74511 is typically used for aircraft fuselage skins, lower wing skins and structural aerospace sheet. In short: improved strength/toughness 7000 series; aerospace extrusion alloy; fasteners or FSW only.
What is the yield strength of 7136 T74511?
7136 T74511 has a typical yield strength of 605 MPa (87.7 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 99% of aluminum grades. Strength varies by condition: see the 6 listed tempers.
Is 7136 T74511 easy to machine?
Reasonably — machinability is rated good (67/100, better than 66% of aluminum grades). Machines very well in T7x tempers with sharp polished carbide tools, high speed and flood/MQL coolant; produces short chips but requires care with residual-stress distortion on thin machined pockets.
Can 7136 T74511 be welded?
Not readily — weldability is rated not recommended (12/100). Not suitable for fusion welding (Cu-bearing 7000-series hot-cracks and loses HAZ strength) — join by fasteners, adhesive bonding or friction stir welding with post-weld ageing evaluation.
What surface finishes work on 7136 T74511?
Chromic or sulfuric anodize, hard anodize, chromate/trivalent conversion coat and epoxy primer are standard; avoid alkaline etch overexposure and use cadmium-free coated fasteners to limit galvanic attack.
Can 7136 T74511 be formed, bent or molded?
Extruded to shape at 380–440 °C; cold forming in T7x is limited to large-radius bends, do severe forming in W or O temper and re-age.
What is the maximum service temperature of 7136 T74511?
7136 T74511 is rated for continuous use to about 140°C (284 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 7136 T76511 and 7136-O?
T76511 is the default condition — standard aerospace supply condition for 7136 extrusions — near-peak strength with EXCO-rated exfoliation resistance and improved toughness. O: softest condition, supplied only for further forming or re-heat-treatment; not a structural condition. Yield strength is 620 MPa in T76511 versus 110 MPa in O.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- MMPDS-17 Metallic Materials Properties Development and Standardization — Battelle/FAA (2022)
- High-strength 7000-series aerospace extrusion alloy data (7136/7055/7150 class) — Universal Alloy Corporation / Alcoa (2015)
- ASTM B221 — Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes — ASTM International (2021)
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.