🪶 MAGNESIUM
Magnesium Suppliers and Machining Shops in Atlanta, GA
Magnesium is the lightest structural metal in commercial use, roughly 35 percent lighter than aluminum, which is exactly why Atlanta's aerospace and automotive buyers keep it on their material lists. Whether you need AZ31B sheet for a bracket, AZ91D die castings for a housing, or WE43 for an elevated-temperature aerospace part, Atlanta's supplier base spans extruders, casters, and CNC shops within a short drive of the I-285 perimeter. This guide covers how local buyers source magnesium and what to confirm before you cut a PO.
ISO 9001AS9100NADCAP
Why Atlanta Buyers Reach for Magnesium
The single biggest magnesium driver in metro Atlanta is weight-sensitive aerospace work. With Lockheed Martin running F-35 component production and C-130J assembly out of the Marietta complex, the surrounding tier-two and tier-three supply chain handles a steady stream of lightweight brackets, gearbox housings, and avionics enclosures where magnesium's strength-to-weight ratio earns its premium over aluminum.
The second driver is automotive. Georgia's assembly and powertrain base, including the Kia plant in West Point and a deepening EV supplier network around the metro, uses magnesium die castings for steering column components, seat frames, and instrument panel beams. Those parts almost always start as AZ91D, the workhorse die casting alloy, and many get secondary CNC operations at shops inside the perimeter.
A third, smaller pull comes from Atlanta's electronics and consumer product makers who use thin-wall magnesium castings for thermal management and EMI shielding. Across all three sectors, the common thread is that buyers are paying for mass reduction, not raw material savings, so alloy selection and process control matter more than chasing the lowest per-pound price.
AZ31B, AZ91D, and WE43: Picking the Right Grade
AZ31B is the most common wrought magnesium alloy and the one Atlanta fabricators see most often as sheet, plate, and extruded profiles. It machines cleanly, welds with proper inert gas shielding, and forms well at moderate temperatures. Use it for brackets, panels, and frames where you need a wrought structure rather than a casting. Typical tensile strength runs around 37 ksi with good ductility.
AZ91D is the dominant die casting alloy, and if your part is a complex near-net-shape housing or bracket coming out of a die, this is almost certainly your material. It offers excellent castability and corrosion resistance for a magnesium alloy, with the 'D' designation indicating the high-purity version that resists salt-spray corrosion far better than older AZ91 variants. Most automotive and consumer magnesium parts in the region are AZ91D.
WE43 is the aerospace and defense specialty grade. This yttrium and rare-earth alloy holds its mechanical properties at elevated temperatures up to roughly 250C, making it the choice for helicopter transmission housings, missile components, and other parts that see heat. It is more expensive and harder to source than AZ31B or AZ91D, so confirm lead time and minimum order quantities with your Atlanta supplier early; WE43 stock is not something most shops keep on the shelf.
Frequently Asked Questions
Yes, though pure magnesium die casting capacity is more specialized than aluminum die casting. Several die casters in the broader Southeast region serve Atlanta's automotive and aerospace buyers with AZ91D, the standard high-pressure die casting alloy. If your part is a complex thin-wall housing or bracket in moderate to high volume, die casting is usually the most cost-effective route because it produces near-net shapes that need minimal machining. For lower volumes or prototypes, you may be better served by machining from wrought AZ31B billet at a local CNC shop. When sourcing through ManufacturingBase, filter for die casting capability and confirm the shop runs magnesium specifically, since magnesium die casting requires hot-chamber equipment and chip-handling protocols distinct from aluminum. Ask about tooling cost, expected cycle time, and whether they offer secondary CNC and finishing in-house, because moving a magnesium casting between shops adds freight and lead time. Lead times for new tooling typically run several weeks, so plan accordingly.
It comes down to weight. Magnesium is roughly 35 percent less dense than aluminum and about 78 percent less dense than steel, so for a given stiffness or strength target, a magnesium part can weigh significantly less. In aerospace and defense applications like those supporting Lockheed Martin's programs in Marietta, removing mass from a bracket, housing, or transmission case directly improves payload, range, or fuel efficiency, which justifies magnesium's higher material and processing cost. That said, magnesium is not a universal aluminum replacement. It has lower stiffness per unit volume, costs more, and requires corrosion protection and careful fire-safe machining. Engineers reach for it specifically when weight is the dominant constraint and the part operates within magnesium's temperature and corrosion limits. For elevated-temperature aerospace parts, WE43 extends magnesium's usable range to around 250C, which is why it shows up in rotorcraft gearboxes and defense hardware. For most general structural work, aluminum still wins on cost and ease of fabrication, so the two metals coexist on the same aircraft.
For aerospace and defense magnesium work in the Atlanta area, the baseline is AS9100, the aerospace quality management standard that builds on ISO 9001 with additional requirements for traceability, configuration control, and risk management. Any shop making flight hardware for the F-35 or C-130J supply chain will hold AS9100 certification. Beyond that, look for NADCAP accreditation on any special processes your part requires, such as chemical processing for chromate conversion coatings, anodizing, or non-destructive testing. NADCAP is effectively mandatory for primes and their tier-one suppliers. If the work involves controlled defense data or articles, the supplier must also be ITAR-registered with the State Department, which governs how technical data and parts are handled and who can access them. When you source through ManufacturingBase, filter for AS9100 and NADCAP, then confirm the specific accreditation scope matches your process, since NADCAP is granted per process category rather than as a blanket approval. Material certs and full lot traceability back to the mill should come standard.
Atlanta's hot, humid summers make corrosion protection essential for magnesium parts, especially any that see outdoor, under-hood, or marine-adjacent service. Bare magnesium is among the more reactive structural metals and corrodes quickly in the presence of moisture and salt, and it suffers galvanic corrosion when in direct contact with steel, aluminum, or fasteners of dissimilar metals. To protect parts, Atlanta finishers apply chromate conversion coatings, anodize processes such as the Tagnite or Keronite systems, e-coats, or powder coatings, often in combination. The high-purity AZ91D alloy resists salt-spray corrosion far better than older magnesium grades, which is one reason it dominates automotive use, but even AZ91D parts typically receive a protective finish for durability. When specifying a magnesium part for service in the Southeast, define the finish and any sealing requirements explicitly in your drawing, and require salt-spray test data if the part is safety-critical. Also design the assembly to isolate magnesium from dissimilar metals using washers, coatings, or barrier materials to prevent galvanic attack at fastener locations.
Last updated: July 2026
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