Aluminum 7136
AA 7136 · UNS A97136
7136 is an Alcoa-developed Al-Zn-Mg-Cu (7000 series) alloy registered as A97136, supplied mainly in stress-relieved extrusion tempers T6511, T73511, T74511 and T76511 plus O and W51.
Reference datasheet — 7136 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the T76511 condition
7136 tempers and conditions
7136 is supplied in 6 conditions, soft to hard. T76511 is the default FabDigit quotes; the values on this page are for it.
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 |
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?
7136 is an Alcoa-developed Al-Zn-Mg-Cu (7000 series) alloy registered as A97136, supplied mainly in stress-relieved extrusion tempers T6511, T73511, T74511 and T76511 plus O and W51. It is chosen for a better strength/toughness balance than earlier high-strength 7000-series grades, at 620 MPa yield, 655 MPa tensile, 11% elongation and 175 HB, in extrusions and sheet for fuselage and lower wing skins. Copper content rules out fusion welding, corrosion resistance is moderate (45/100) and service is limited to 120 °C; 7055 and 7150 are the nearest alternatives. 7136 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). 7136 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 99% of aluminum grades. Elongation at break is 11% and the elastic modulus is 71 GPa (10.3 Msi).
What is 7136 used for?
- aircraft fuselage skins
- lower wing skins
- structural aerospace sheet
Advantages
- High strength — 620 MPa (89.9 ksi), better than 99% of aluminum grades
- Tough — resists crack growth — 33 MPa·√m (30 ksi·√in), better than 87% of aluminum grades
Limitations
- Difficult to weld — 12/100, worse than 98% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
7136 properties
Typical room-temperature values for 7136-T76511; bars are the position among aluminum grades.
Physical3
7136 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 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 99% of aluminum grades. Elongation at break is 11% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
7136 is rated for continuous service to 120°C (248 °F). It conducts heat at 145 W/m·K (83.8 BTU/hr·ft·°F), better than 53% of aluminum grades. Thermal expansion is 23.4 µm/m·K (13 µin/in·°F).
Electrical3
7136 conducts electricity at 36 % IACS, better than 55% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 62% of aluminum grades.
Sustainability4
Producing a kilogram of 7136 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's machinability is good (68/100, better than 67% of aluminum grades); weldability not recommended (12/100); formability poor (22/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the aluminum family
Yield strength against density for every aluminum grade FabDigit runs. 7136 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 7136
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.
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 |
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.
Surface treatments FabDigit runs on aluminum parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Equivalent designations
Standards and trade names that resolve to Aluminum 7136 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- A97136
How much does 7136 cost?
7136 is a high-cost aluminum ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
7136 — frequently asked
What is 7136 used for?
7136 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?
7136 has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 99% of aluminum grades. Strength varies by condition: see the 6 listed tempers.
Is 7136 easy to machine?
Reasonably — machinability is rated good (68/100, better than 67% 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 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?
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 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?
7136 is rated for continuous use to about 120°C (248 °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.
How much does 7136 cost?
7136 is a high-cost aluminum ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.