Aluminum 7475-W51
Heat-treated state
AA 7475 · UNS A97475 · EN AW-7475, AW 7475
W51 = as-quenched, stress relieved by stretching
Freshly quenched, refrigerated material used for stretch-forming or bending before artificial aging to T6/T73.
Values for the W51 condition
Other 7475 tempers and conditions
7475 is listed in 10 conditions; see the grade overview at 7475.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest condition for severe forming or machining before solution treatment. | 105 | 228 | 17 | 60 HB | 45 % IACS |
W51This page As-quenched, stress relieved by stretching | Freshly quenched, refrigerated material used for stretch-forming or bending before artificial aging to T6/T73. | 220 | 380 | 17 | 95 HB | 31 % IACS |
Solution heat treated and overaged for stress-corrosion resistance | Choose where stress-corrosion cracking in the short-transverse direction must be eliminated, accepting ~10 % strength loss. | 420 | 490 | 13 | 133 HB | 40 % IACS |
T73, stress relieved by stretching | Default damage-tolerant plate temper: highest fracture toughness plus SCC immunity and low residual stress for heavy machining. | 421 | 490 | 13 | 135 HB | 40 % IACS |
Overaged for exfoliation resistance | Sheet temper balancing near-T6 strength with exfoliation/SCC resistance for skins and thin machined parts. | 427 | 496 | 12 | 136 HB | 38.5 % IACS |
T6 variant, underaged | Standard high-toughness 7475 sheet temper for fuselage/wing skins needing damage tolerance at near-T6 strength. | 448 | 524 | 12 | 142 HB | 36 % IACS |
Overaged for exfoliation-corrosion resistance | High-purity 7475 sheet/plate overaged to the T76 condition, trading a little strength from T6 for markedly better exfoliation-corrosion resistance and fracture toughness. | 455 | 524 | 12 | 142 HB | 40 % IACS |
T76, stress relieved by stretching | Plate compromise between T651 strength and T7351 corrosion/toughness; common for machined wing and frame components. | 455 | 524 | 12 | 140 HB | 38.5 % IACS |
Solution heat treated and artificially aged | Pick for maximum static strength where SCC exposure is low and part is not stretch-relieved. | 496 | 565 | 11 | 148 HB | 33 % IACS |
T6, stress relieved by stretching | Peak-strength plate with low residual stress for machined structural parts and moulds. | 496 | 565 | 11 | 150 HB | 33 % IACS |
What is 7475-W51?
7475-W51 is 7475 heat treated to W51 — freshly quenched, refrigerated material used for stretch-forming or bending before artificial aging to T6/T73. 7475-W51 has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 59% of aluminum grades. Elongation at break is 17% and the elastic modulus is 71 GPa (10.3 Msi). 7475-W51 has a density of 2.81 g/cm³ (0.102 lb/in³), heavier than 86% of aluminum grades. It melts at 477°C (891 °F).
Advantages
- Tough — resists crack growth — 66 MPa·√m (60.1 ksi·√in), better than 100% of aluminum grades
- Ductile — tolerates forming and impact — 17%, better than 85% of aluminum grades
- Polishes to a fine finish — 65/100, better than 82% of aluminum grades
- Forms and bends easily — 60/100, better than 77% of aluminum grades
Limitations
- Limited service temperature — 65°C (149 °F), worse than 97% of aluminum grades
- Difficult to weld — 18/100, worse than 94% of aluminum grades
- Needs corrosion protection — 35/100, worse than 85% of aluminum grades
7475-W51 properties
Typical room-temperature values for 7475-W51; 19 are specific to this condition. Other listed values are 7475 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
7475-W51 has a density of 2.81 g/cm³ (0.102 lb/in³), heavier than 86% of aluminum grades. It melts at 477°C (891 °F).
Mechanical12
7475-W51 has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 59% of aluminum grades. Elongation at break is 17% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
7475-W51 is rated for continuous service to 65°C (149 °F). It conducts heat at 130 W/m·K (75.1 BTU/hr·ft·°F), worse than 65% of aluminum grades. Thermal expansion is 22.7 µm/m·K (12.6 µin/in·°F).
Electrical3
7475-W51 conducts electricity at 31 % IACS, worse than 68% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (35/100), worse than 85% of aluminum grades.
Sustainability4
Producing a kilogram of 7475-W51 takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 12%.
Manufacturability8
7475-W51's machinability is good (60/100, worse than 51% of aluminum grades); weldability poor (18/100); formability good (60/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 7475-W51
Is 7475 easy to machine?
Machines well in aged tempers with sharp polished-flute carbide, high speed and flood coolant; T7x plate distorts less than T651 thanks to stretch stress relief.
Can 7475 be welded?
Not fusion weldable in structure (hot cracking, SCC in HAZ) — join by riveting, adhesive bonding or friction-stir welding with post-weld temper control.
Can 7475 be formed, bent or molded?
Form in O or freshly quenched W temper then age; aged T6/T7x sheet needs generous bend radii (typically ≥4–6 t) and often warm forming.
What surface finishes work on 7475?
Responds well to chromate/anodic pretreatments; clear or hard anodize is standard, and aerospace parts are usually clad, chromated and primed for corrosion protection.
7475 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 | 5.2 – 6.2 | 5.7 |
| Mg | 1.9 – 2.6 | 2.25 |
| Cu | 1.2 – 1.9 | 1.6 |
| Crgrain-structure control | 0.18 – 0.25 | 0.21 |
| Fetightly limited for toughness | ≤ 0.12 | 0.07 |
| Sitightly limited for toughness | ≤ 0.1 | 0.06 |
| Mn | ≤ 0.06 | 0.02 |
| Ti | ≤ 0.06 | 0.03 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
7475-W51 — frequently asked
What is 7475-W51 used for?
7475-W51 is typically used for wing skins, fuselage skins and stringers. In short: damage-tolerant aerospace plate.
What is the yield strength of 7475-W51?
7475-W51 has a typical yield strength of 220 MPa (31.9 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 59% of aluminum grades. Strength varies by condition: see the 10 listed tempers.
Is 7475-W51 easy to machine?
Reasonably — machinability is rated good (60/100, worse than 51% of aluminum grades). Machines well in aged tempers with sharp polished-flute carbide, high speed and flood coolant; T7x plate distorts less than T651 thanks to stretch stress relief.
Can 7475-W51 be welded?
Not readily — weldability is rated poor (18/100). Not fusion weldable in structure (hot cracking, SCC in HAZ) — join by riveting, adhesive bonding or friction-stir welding with post-weld temper control.
What surface finishes work on 7475-W51?
Responds well to chromate/anodic pretreatments; clear or hard anodize is standard, and aerospace parts are usually clad, chromated and primed for corrosion protection.
Can 7475-W51 be formed, bent or molded?
Form in O or freshly quenched W temper then age; aged T6/T7x sheet needs generous bend radii (typically ≥4–6 t) and often warm forming.
What is the maximum service temperature of 7475-W51?
7475-W51 is rated for continuous use to about 65°C (149 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in 7475-W51?
Yes — 7475-W51 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 4202 / AMS 4084 — 7475 Aluminum Alloy Plate and Sheet — SAE International (2019)
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 19: Fatigue and Fracture — ASM International (1996)
- MMPDS-Metallic Materials Properties Development and Standardization (7475 typical values) — FAA/Battelle (2023)
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.