Aluminum 7175 T74511
Precip hard
AA 7175 · EN AW-7175, AW 7175
T74511 = extrusion: T74 overaged, stretched, straightened
Extruded stringers/spar caps needing higher strength than T73511 with good SCC behaviour.
Values for the T74511 condition
Other 7175 tempers and conditions
7175 is listed in 13 conditions; see the grade overview at 7175.
Compare all 13 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest condition, used only for intermediate forming/machining before solution treatment. | 105 | 230 | 17 | 60 HB | 45 % IACS |
T73, stress relieved by stretching | Low-residual-stress overaged plate/bar for thick machined aerospace fittings. | 440 | 510 | 12 | 138 HB | 40 % IACS |
Overaged, stress relieved by cold compression | Large forgings that must be heavily machined — compression stress relief keeps parts dimensionally stable. | 440 | 510 | 10 | 142 HB | 39 % IACS |
Extrusion: overaged, stretched, minor straightening permitted | Overaged extruded shapes/bar where SCC resistance and straightness are both required. | 450 | 515 | 10 | 140 HB | 40 % IACS |
Solution treated, stress relieved by stretching/compression, overaged | Default aerospace supply condition: overaged for SCC resistance with residual stress removed for dimensionally stable machining. | 455 | 524 | 11 | 140 HB | 40 % IACS |
Overaged (T74) and stress relieved by cold restriking in the finish die | High-strength Al-Zn-Mg-Cu die-forging temper: T74 two-step overage giving near-T6 strength with good SCC and exfoliation resistance, residual stress removed by cold restrike in the finish die. | 455 | 525 | 11 | 135 HB | 40 % IACS |
Solution heat treated and overaged for stress-corrosion resistance | Choose when short-transverse SCC resistance and toughness outrank peak strength. | 455 | 525 | 12 | 140 HB | 40 % IACS |
Overaged between T73 and T76 | The workhorse 7175 forging temper: near-T6 strength with T73-level SCC and toughness performance. | 455 | 524 | 11 | 145 HB | 39 % IACS |
T74511This page Extrusion: T74 overaged, stretched, straightened | Extruded stringers/spar caps needing higher strength than T73511 with good SCC behaviour. | 490 | 545 | 10 | 148 HB | 38 % IACS |
Extrusion: overaged for exfoliation resistance, stretched | Intermediate overage giving good exfoliation resistance with strength above T73 tempers. | 490 | 545 | 10 | 148 HB | 38 % IACS |
T6, stress relieved by stretching | Peak-strength plate with low residual stress for stable machining of thick parts. | 515 | 585 | 11 | 150 HB | 33 % IACS |
Solution heat treated and artificially aged | Maximum strength condition for forgings/extrusions where SCC exposure is low. | 525 | 595 | 11 | 150 HB | 33 % IACS |
T6 with improved mechanical properties | Highest-strength registered temper for 7175 die forgings when maximum static strength is needed. | 560 | 620 | 9 | 160 HB | 32 % IACS |
What is 7175 T74511?
7175 T74511 is 7175 in the T74511 condition — extruded stringers/spar caps needing higher strength than T73511 with good SCC behaviour. 7175 T74511 has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 545 MPa (79 ksi) — stronger than 95% of aluminum grades. Elongation at break is 10% and the elastic modulus is 71.7 GPa (10.4 Msi). 7175 T74511 has a density of 2.8 g/cm³ (0.101 lb/in³), heavier than 81% of aluminum grades. It melts at 477°C (891 °F).
Advantages
- High strength — 490 MPa (71.1 ksi), better than 95% of aluminum grades
- Easy to machine — 79/100, better than 91% of aluminum grades
- Tough — resists crack growth — 33 MPa·√m (30 ksi·√in), better than 87% of aluminum grades
- High service temperature — 170°C (338 °F), better than 80% of aluminum grades
Limitations
- Difficult to weld — 12/100, worse than 98% of aluminum grades
7175 T74511 properties
Typical room-temperature values for 7175 T74511; 22 are specific to this condition. Other listed values are 7175 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
7175 T74511 has a density of 2.8 g/cm³ (0.101 lb/in³), heavier than 81% of aluminum grades. It melts at 477°C (891 °F).
Mechanical14
7175 T74511 has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 545 MPa (79 ksi) — stronger than 95% of aluminum grades. Elongation at break is 10% and the elastic modulus is 71.7 GPa (10.4 Msi).
Thermal6
7175 T74511 is rated for continuous service to 170°C (338 °F). It conducts heat at 148 W/m·K (85.5 BTU/hr·ft·°F), better than 56% of aluminum grades. Thermal expansion is 23.4 µm/m·K (13 µin/in·°F).
Electrical3
7175 T74511 conducts electricity at 38 % IACS, better than 61% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 62% of aluminum grades.
Sustainability4
Producing a kilogram of 7175 T74511 takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 8%.
Manufacturability7
7175 T74511's machinability is very good (79/100, better than 91% 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 7175 T74511
Is 7175 easy to machine?
Machines very well in T7x tempers with sharp polished carbide, high speed and flood coolant; expect long chips and use chip-breaking geometry.
Can 7175 be welded?
Not arc weldable for structure (hot-cracking, SCC in HAZ); join by riveting, bolting, adhesive bonding or friction stir welding with process qualification.
Can 7175 be formed, bent or molded?
Forge/hot work at ~380–440 °C; cold forming in T-tempers is very limited — form in O or W temper and re-heat-treat.
What surface finishes work on 7175?
Chromic/sulfuric anodize, Type III hardcoat, chemical conversion coating (Alodine) plus primer; avoid caustic etch overexposure on close-tolerance machined parts.
7175 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 |
|---|---|---|
| Zn | 5.1 – 6.1 | 5.6 |
| Mg | 2.1 – 2.9 | 2.5 |
| Cu | 1.2 – 2 | 1.6 |
| Crgrain-structure control | 0.18 – 0.28 | 0.23 |
| Ferestricted vs 7075 for toughness | ≤ 0.2 | 0.12 |
| Sirestricted vs 7075 | ≤ 0.15 | 0.08 |
| Mn | ≤ 0.1 | 0.03 |
| Ti | ≤ 0.1 | 0.03 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
7175 T74511 — frequently asked
What is 7175 T74511 used for?
7175 T74511 is typically used for aircraft structural fittings, helicopter rotor hubs, fuselage frames and bulkheads, landing gear components, wing and spar forgings and highly loaded machined brackets. In short: premium aerospace forging.
What is the yield strength of 7175 T74511?
7175 T74511 has a typical yield strength of 490 MPa (71.1 ksi) and a tensile strength of 545 MPa (79 ksi) — stronger than 95% of aluminum grades. Strength varies by condition: see the 13 listed tempers.
Is 7175 T74511 easy to machine?
Yes — machinability is rated very good (79/100, better than 91% of aluminum grades). Machines very well in T7x tempers with sharp polished carbide, high speed and flood coolant; expect long chips and use chip-breaking geometry.
Can 7175 T74511 be welded?
Not readily — weldability is rated not recommended (12/100). Not arc weldable for structure (hot-cracking, SCC in HAZ); join by riveting, bolting, adhesive bonding or friction stir welding with process qualification.
What surface finishes work on 7175 T74511?
Chromic/sulfuric anodize, Type III hardcoat, chemical conversion coating (Alodine) plus primer; avoid caustic etch overexposure on close-tolerance machined parts.
Can 7175 T74511 be formed, bent or molded?
Forge/hot work at ~380–440 °C; cold forming in T-tempers is very limited — form in O or W temper and re-heat-treat.
What is the maximum service temperature of 7175 T74511?
7175 T74511 is rated for continuous use to about 170°C (338 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in 7175 T74511?
Yes — 7175 T74511 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)
- AMS 4149 — Aluminum Alloy 7175 Die Forgings and Rolled Rings, T74 — SAE International (2018)
- ASTM B247 — Aluminum-Alloy Die, Hand and Rolled Ring Forgings — ASTM International (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- MMPDS — Metallic Materials Properties Development and Standardization — Battelle/FAA (2019)
- 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.