Aerospace buyers rarely ask for the cheapest part. They ask for the part that will survive certification, thousands of pressurisation cycles and a full audit trail years after delivery. That is why aerospace aluminum forgings remain the default choice for structural brackets, fittings, actuator housings and rib components, even where casting or plate machining would look cheaper on a quotation sheet. This guide explains which alloys are used, what standards apply, and what to check before you release a forging drawing to a supplier.
Why aerospace structures are forged rather than cast or cut from plate
Three properties decide the choice, and forging wins on all three.
- Grain flow follows the load path. In a forging, the metal fibres are shaped around the part contour instead of being cut across, which raises fatigue strength precisely where stress concentrates. Plate machining severs those fibres at every pocket and radius.
- No internal porosity. Cast aluminium can carry gas porosity that only appears after machining opens the surface. Forged material is fully consolidated, so non-destructive inspection results are far more predictable.
- Consistency across a production batch. Closed-die forging repeats the same deformation history part after part, which matters when a lot must be released against a single set of mechanical test coupons.
For a broader strength comparison between the processes, see our overview of common aluminum forging defects and how to prevent them.
Aluminium alloys used in aerospace forging
Alloy choice in aerospace is a trade between static strength, fracture toughness, corrosion resistance and forgeability.
- 7075 is the classic high-strength aerospace grade, used for fittings and highly loaded brackets in the T6 or, for better stress-corrosion resistance, T73 condition. Its forging window is narrow and it is crack-sensitive, so process control matters more than with 6-series alloys. We cover the practical issues in can 7075 aluminum be forged.
- 7050 offers better thickness capability and stress-corrosion cracking resistance than 7075 in heavy sections, which is why it appears on thicker structural forgings.
- 2014 and 2024 provide high strength with good elevated-temperature behaviour, at the cost of poorer corrosion resistance, so they are normally protected by cladding, anodising or primer.
- 6061 covers secondary structure, interior fittings and equipment housings where moderate strength, good corrosion resistance and weldability are enough at a lower cost. A side-by-side view of the general-purpose grades is available in 6061 vs 7075 vs 6082.
The practical rule: specify the temper together with the alloy. A 7075 forging means very little until you state T6, T73 or T7351, because the heat treatment defines both strength and stress-corrosion behaviour. Our heat treatment guide for forged aluminum explains how each temper is achieved.
Standards, traceability and documentation
Aerospace work is documentation-heavy by design. Expect the following to be part of the package rather than an extra:
- Material certification traceable to the mill heat number, matched to the forging lot.
- Mechanical property testing on coupons taken from the forging or from prolongations, covering tensile strength, yield and elongation in the specified direction.
- Dimensional inspection reports, typically CMM-based, against the drawing datum scheme rather than against convenient surfaces.
- Process records for forging temperature, number of blows, solution treatment and ageing cycles.
- Non-destructive testing where the drawing calls for it, commonly penetrant inspection for surface indications and ultrasonic inspection for heavier sections.
If a supplier cannot produce this chain on request, the parts may be dimensionally correct and still be unusable, because the paperwork is part of the product.
Design guidelines that keep aerospace forgings affordable
Most cost overruns on aerospace forgings originate in the drawing, not the shop floor.
- Allow realistic draft. Conventional hot forging in aluminium wants 3°–7° of draft. Zero-draft demands precision tooling and ejection systems that add tooling cost.
- Do not specify sharp internal corners. Generous fillet radii let metal fill the cavity, reduce forming pressure and extend die life. Sharp corners invite laps and underfill.
- Set machining allowance where it is needed, not everywhere. Near-net forging with 0.5–2 mm allowance on functional surfaces, and as-forged finish elsewhere, removes a large share of downstream machining hours.
- State the tolerance grade deliberately. Blanket tight tolerances on non-functional features multiply inspection cost with no engineering benefit. Our note on aluminum forging tolerances sets out what is realistic as-forged versus after machining.
- Discuss the parting line early. Its position affects grain flow, flash volume and where witness marks appear, all of which are easier to change on a CAD model than on a cut die. See aluminum forging die design for the full logic.
Choosing a forging and machining partner
For aerospace-adjacent and industrial programmes, the practical selection criteria are consistent:
- Press capacity range, so small fittings and larger structural parts can run on the same qualified process rather than being split across vendors.
- In-house die design, because tooling iterations are where lead time is usually lost.
- Integrated CNC finishing, which keeps datum control inside one facility and removes a handover point between forging and machining.
- A documented quality system with real inspection equipment behind it, not just a certificate on the wall.
Guangdong XinPingFu operates a 3,000 m² plant with six precision forging presses from 300T to 2,500T, two cold forging presses and twelve CNC machining centres, holds ISO9001 certification and an AAA credit rating, and maintains a batch acceptance rate of 99.7%. We supply forged and finished aluminium components for automotive, new energy, medical, robotics and high-performance equipment customers, and we work to customer drawings with full material and dimensional documentation.
About Guangdong XinPingFu
Guangdong XinPingFu Forging Co., Ltd. is located in Guangming District, Shenzhen, Guangdong, China, and has specialised in aluminium alloy precision forging and CNC machining for 20 years. Our capability covers die design, hot and cold forging, heat treatment, CNC finishing and surface treatment under one roof, supported by ISO9001 quality management and AAA credit certification.
Send us your drawing and annual volume, and we will come back with a manufacturability review, tooling proposal and quotation.
