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A7050
ISO N (non-ferrous)Aluminum alloy (heat-treatable Al-Zn-Mg-Cu, 7000 series. An alloy with improved hardenability over 7075). The JIS standard that covers it has not been confirmed.
🌐International equivalents
“Close” means composition or properties are not exactly the same. Before substituting, check the values in each standard.
| System | Designation | Number | Relation | Confidence |
|---|---|---|---|---|
| JIS | A7050 | — | ||
| AA | 7050 | UNS A97050 | identical (internationally registered alloy) | Agrees in 2+ sources[5][13][10] |
| EN | EN AW-7050ISO chemical symbol AlZn6CuMgZr, aerospace material number WL 3.4144 | EN AW-7050 | identical (internationally registered alloy) | Agrees in 2+ sources[10][14][15] |
| GB | — | — | Not confirmed |
📄Related specifications (AMS, ASTM etc.)
Specifications called up on purchase orders and drawings. AMS are SAE aerospace material specifications, split by product form (bar, plate, forging), melting practice and heat treatment. Standard texts are paid, so only titles and scopes checked on the publishers’ public pages are shown.
| Spec | Scope | Confidence |
|---|---|---|
| AMS 4050K | Aluminum Alloy, Plate 6.2Zn - 2.3Cu - 2.2Mg - 0.12Zr (7050-T7451) Solution Heat Treated, Stress Relieved, and OveragedPlate, T7451 (revised 2021-04-22) | Agrees in 2+ sources[17] |
| AMS 4201H | ALUMINUM ALLOY PLATE 6.2Zn - 2.3Cu - 2.2Mg - 0.12Zr (7050-T7651)Plate, T7651 (revised 2025-02-25) | Agrees in 2+ sources[18] |
| AMS 4107H | Aluminum Alloy Die Forgings (7050-T74) Solution Heat Treated and OveragedDie forgings (nominal thickness 6.000in or less) and stock for forging, T74 (revised 2023-05-10) | Agrees in 2+ sources[19] |
| AMS 4108G | Aluminum Alloy, Hand Forgings, 6.2Zn - 2.3Cu - 2.2Mg - 0.12Zr (7050-T7452), Solution Heat Treated, Compression Stress-Relieved, and OveragedHand forgings (nominal thickness 8in or less) and stock for forging, T7452 (revised 2026-04-20. The original edition's title writes the temper as T73652) | Agrees in 2+ sources[20][21] |
| AMS 4342G | Aluminum Alloy, Extrusions 6.2Zn - 2.3Cu - 2.2Mg - 0.12Zr (7050-T74511) Solution Heat Treated, Stress Relieved, Straightened, and OveragedExtruded bar, wire, profiles and tube, T74511 (revised 2023-09-05. The original edition's title writes the temper as T736511) | Agrees in 2+ sources[22][23] |
| ASTM B247-20 | Standard Specification for Aluminum and Aluminum-Alloy Die Forgings, Hand Forgings, and Rolled Ring ForgingsDie forgings, hand forgings and ring forgings. The overview lists A97050 with tempers including T74, T7452 and T7454 (the overview does not show which tempers apply to 7050) | Agrees in 2+ sources[13] |
All ASTM standards on Kezuriba: ASTM standards quick reference.
✈Main aerospace uses (as stated in the sources)
- Suited to plate and forgings; example applications are aircraft and high-speed rotating bodies (Japan Aluminium Association)[1]
- Die forgings and large forged bars for aircraft. An alloy designed for structural parts subject to high fatigue stress and the risk of corrosion (Aubert & Duval)[10]
- In fuselage built-up structures, 7050, 7150 and 7055 have recently been used as high-strength stiffeners reinforcing the skin (2024-T3). A study of Boeing's integrally stiffened fuselage panels evaluated 7050-T7451 plate and 7050-T74511 extrusions (NASA-sponsored report)[24][25]
- Aircraft applications such as fuselage frames and bulkheads (thyssenkrupp Materials North America material)[26]
⚗Chemical composition (mass %)
As specified in Composition of AA internationally registered alloy (Japan Aluminium Association: alloys with the same four digits as a JIS alloy have identical chemical composition)
| Element | Range | Confidence |
|---|---|---|
| Si | ≤ 0.12 | Agrees in 2+ sources[5][6][7] |
| Fe | ≤ 0.15 | Agrees in 2+ sources[5][6][7] |
| Cu | 2.0 – 2.6 | Agrees in 2+ sources[5][6][7] |
| Mn | ≤ 0.1 | Agrees in 2+ sources[5][7] |
| Mg | 1.9 – 2.6 | Agrees in 2+ sources[5][6][7] |
| Cr | ≤ 0.04 | Agrees in 2+ sources[5][6][7] |
| Zn | 5.7 – 6.7 | Agrees in 2+ sources[5][6][7] |
| Ti | ≤ 0.06 | Agrees in 2+ sources[5][6][7] |
| Zr | 0.08 – 0.15 | Agrees in 2+ sources[5][6][7] |
| Others (each / total) | ≤ 0.05 / 0.15 | Agrees in 2+ sources[5][7] |
| Al | Balance | One source / reference[5] |
⚖Density
2.83 g/cm³
Agrees in 2+ sources[12][10][11]
Calculated value 2.83 in AA Teal Sheets, 2.83 in Aubert & Duval. OTTO FUCHS gives 2.82 in a row common to 7050/7150
Calculate weight in A7050 →💪Mechanical properties
“Reference” values are not specified minimums from the standard but figures published by makers and others.
| Condition | Tensile MPa | Yield MPa | Elong. % | Hardness | Type of value |
|---|---|---|---|---|---|
| JIS specified value (both tempers and products) | — | — | — | — | JIS specified value Not confirmed |
| T7451 (plate, AMS 4050 specified values) | — | — | — | — | AMS specified value Not confirmed |
| T73510/T73511 (extruded bar and profiles, thickness 5.000in or less, cross-sectional area 32in² or less) | ≥ 483 (70.0ksi) | ≥ 414 (60.0ksi) | ≥ 8 | — | AA specified value (Aluminum Standards and Data 2009 Table 11.1 "Mechanical Property Limits—Extruded Wire, Rod, Bar and Profiles". MPa converted from ksi) One source / reference[8] |
| T74510/T74511 (extruded bar and profiles, thickness 5.000in or less, cross-sectional area 32in² or less) | ≥ 503 (73.0ksi) | ≥ 434 (63.0ksi) | ≥ 7 | — | AA specified value (same as above) One source / reference[8] |
| T76510/T76511 (extruded bar and profiles, thickness 0.499in or less / 0.500–5.000in, cross-sectional area 32in² or less) | ≥ 531 (77.0ksi) / >=545 (79.0ksi) | ≥ 469 (68.0ksi) / >=476 (69.0ksi) | ≥ 7 | — | AA specified value (same as above) One source / reference[8] |
| T7451 (AA typical value) | 524 (76ksi) | 469 (68ksi) | 11 (1/2in diameter test specimen) | — | Reference value (AA typical value. Published in thyssenkrupp Materials North America's material, which is marked "Not for Design") One source / reference[9] |
| T7452 (hand forging, thickness 150/175mm, L direction) | >469 | >400 | >9 (5d) | — | Reference value (Aubert & Duval material. Written with ">", but the end of the material notes "typical and average values, not guaranteed values") One source / reference[10] |
| T74 (die forging, thickness 100/125mm, L direction) | >483 | >414 | >7 (5d) | — | Reference value (Aubert & Duval material. Same as above. K1c (L-T) >27.5 MPa√m is also listed) One source / reference[10] |
| Forgings and extrusions (no temper specified. Row common to 7050/7150) | 430–500 | 360–440 | 3–9 (A5) | — | Reference value (OTTO FUCHS "Standard Values". Material code AZ84) One source / reference[11] |
1 MPa ≈ 145 psi (0.145 ksi). Hardness conversion · unit converter
🔧Machinability notes (as stated in the sources)
- AA comparative rating (A–E): T7451 = B[16]
📚Sources
Primary sources (public documents from makers, industry associations and standards bodies), numbered where each value is cited. Many are in Japanese.
- aluminum.or.jp https://www.aluminum.or.jp/wp-content/themes/dp-colors/img/AboutAluminum.pdf#page=36
- sandvik.coromant.com https://www.sandvik.coromant.com/en-us/knowledge/materials/workpiece-materials
- kyocera.co.jp https://www.kyocera.co.jp/prdct/tool/wp-content/uploads/2014/07/2024-2026_A.pdf
- sumitool.com https://www.sumitool.com/downloads/cutting-tools/general-catalog/assets/pdf/a.pdf
- aluminum.org https://www.aluminum.org/sites/default/files/2021-11/TealSheet.pdf#page=23
- ntrs.nasa.gov https://ntrs.nasa.gov/api/citations/19770019328/downloads/19770019328.pdf#page=57
- ucpcdn.thyssenkrupp.com https://ucpcdn.thyssenkrupp.com/_legacy/UCPthyssenkruppBAMXNA/assets.files/tkmna_com/cbs/n…
- aluminum.org https://www.aluminum.org/sites/default/files/2022-12/Table_11.1.pdf#page=3
- ucpcdn.thyssenkrupp.com https://ucpcdn.thyssenkrupp.com/_legacy/UCPthyssenkruppBAMXNA/assets.files/tkmna_com/cbs/n…
- aubertduval.com https://aubertduval.com/wp-content/uploads/2024/12/7050_GB.pdf
- otto-fuchs.com https://www.otto-fuchs.com/downloads/02-technisch-werkstoff/werkstoff/ti-aluminium-en.pdf#…
- aluminum.org https://www.aluminum.org/sites/default/files/2021-11/TealSheet.pdf#page=32
- store.astm.org https://store.astm.org/b0247-20.html
- otto-fuchs.com https://www.otto-fuchs.com/downloads/02-technisch-werkstoff/werkstoff/ti-aluminium-en.pdf#…
- aluminum.org https://www.aluminum.org/sites/default/files/2021-11/TealSheet.pdf#page=38
- ucpcdn.thyssenkrupp.com https://ucpcdn.thyssenkrupp.com/_legacy/UCPthyssenkruppBAMXNA/assets.files/tkmna_com/cbs/n…
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS4050K
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS4201/
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS4107H/
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS4108G/
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS4108/
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS4342G/
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS4342/
- ntrs.nasa.gov https://ntrs.nasa.gov/api/citations/20000057324/downloads/20000057324.pdf#page=23
- ntrs.nasa.gov https://ntrs.nasa.gov/api/citations/20000057324/downloads/20000057324.pdf#page=7
- ucpcdn.thyssenkrupp.com https://ucpcdn.thyssenkrupp.com/_legacy/UCPthyssenkruppBAMXNA/assets.files/tkmna_com/cbs/n…
Other materials
Aerospace aluminum