🪶 MAGNESIUM
Magnesium Suppliers and Machining for Des Moines, IA Manufacturers
Magnesium is the lightest structural metal that Des Moines shops can machine and cast economically, roughly a third lighter than aluminum and a quarter the weight of steel. For the city's agricultural-equipment makers, renewable-energy component fabricators, and machinery builders, that density advantage pays off in handheld tools, gearbox housings, and rotating assemblies. This guide covers the grades, processing methods, and sourcing realities for magnesium around the Des Moines metro.
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Why Des Moines Buyers Specify Magnesium
Des Moines manufacturers reach for magnesium when the part has to move, be lifted, or spin. AZ91D die castings turn up in handheld and bench-mounted tooling where an operator carries the weight all shift, and in gearbox and pump housings where every pound of bracket mass that disappears is a pound the structure no longer has to support. Agricultural-equipment builders in the metro look at magnesium for cab-mounted controls, instrument housings, and brackets that ride on vibrating platforms, because lighter parts reduce the fatigue load on their mounts.
The renewable-energy work around central Iowa pulls magnesium in a different direction. Nacelle-mounted enclosures, sensor housings, and access covers benefit from magnesium's combination of low mass and excellent EMI shielding, which matters for the control electronics packed into wind-turbine assemblies. WE43, an yttrium and rare-earth alloy, holds its strength to roughly 250 C, so it becomes a candidate where a magnesium part sits near hot hydraulics or power electronics that would soften the more common AZ alloys.
The trade-off Des Moines engineers weigh is corrosion. Bare magnesium is galvanically active and will sacrifice itself fast against steel or aluminum in a wet, salted environment, which is exactly what farm and construction equipment sees. That reality drives most local magnesium parts toward chromate conversion coatings, anodizing, or full powder-coat systems, and toward isolating bushings at every steel fastener.
Grade Selection: AZ31B, AZ91D, and WE43
AZ31B is the wrought workhorse, supplied as sheet, plate, and extrusion. It contains roughly 3 percent aluminum and 1 percent zinc, takes cold and warm forming, and welds cleanly with TIG using AZ61 or AZ92 filler. Des Moines fabricators choose AZ31B for formed covers, brackets, and panels where they need to bend or weld rather than cast. Typical tensile strength lands around 260 MPa with useful elongation, and it machines beautifully at high spindle speeds.
AZ91D is the dominant die-casting alloy, with about 9 percent aluminum and 1 percent zinc plus tightly controlled iron, nickel, and copper to keep corrosion in check. It is what most local magnesium housings and covers are actually made from, delivering good as-cast strength and excellent fluidity for thin walls down near 1.5 mm. WE43 is the premium choice: an yttrium-neodymium alloy that holds elevated-temperature strength and creep resistance the AZ grades cannot touch, used where the part runs hot or carries sustained load.
For a Des Moines buyer, the practical decision tree is simple. If the part is formed or welded from stock, specify AZ31B. If it is a die or sand casting at room-temperature service, AZ91D covers it. If it sees heat above about 120 C under load, qualify WE43 and budget for the longer lead time and higher cost that rare-earth alloys carry.
Machining and Casting Magnesium Locally
Magnesium is one of the easiest metals to machine, cutting at two to three times the spindle speed of aluminum with low cutting forces and excellent surface finish. Des Moines CNC shops that already run aluminum can hold tight tolerances on magnesium, routinely 0.025 mm on bores and features, with sharp, high-rake tooling and minimal built-up edge. The catch is fire safety: magnesium fines and ribbon chips ignite, so a shop machining it needs dry chip handling, Class D extinguishing media on hand, and disciplined housekeeping. Buyers should confirm a prospective supplier actually runs magnesium regularly rather than treating it as a one-off.
For cast parts, the metro's casting and die-casting capacity can produce AZ91D housings, while sand casting handles lower-volume or larger geometries in AZ91 or WE43. Welding and fabrication shops in the area handle AZ31B with shielded TIG, though magnesium welding demands clean, oxide-free joints and tight gas coverage. Assembly operations should plan for galvanic isolation at every dissimilar-metal interface.
Frequently Asked Questions
Yes, but verify the shop runs magnesium as a regular material rather than improvising. Magnesium machines faster and easier than aluminum, with lower cutting forces and finishes that often need no secondary operation, so the cutting itself is straightforward for any competent CNC house in the metro. The real concern is fire: magnesium chips, dust, and fines ignite, and water makes a magnesium fire worse by releasing hydrogen. A properly equipped shop keeps Class D extinguishing agent or dry sand at the machines, manages chips dry, avoids letting fines accumulate, and never uses water-based coolant carelessly on fine cuts. Ask any candidate supplier how they handle magnesium swarf and what fire suppression they keep on the floor. A shop that answers confidently and has dedicated dry chip handling is the one to trust. Tolerances are not the problem here; bores and features to 0.025 mm are routine. Process discipline is what separates a safe magnesium supplier from a risky one.
Bare magnesium corrodes aggressively, especially when it touches steel or aluminum in a wet, salted, fertilizer-laced environment, which is exactly what agricultural and construction equipment around central Iowa endures. Protection works on two fronts. First, coat the part: chromate conversion coatings such as those under MIL-DTL-5541-class processes give a baseline, but for real field durability most Des Moines applications go to a full system of conversion coat plus epoxy primer plus topcoat or powder coat. Anodizing processes specific to magnesium add another durable barrier. Second, manage galvanic contact: every steel fastener, washer, or bracket that touches the magnesium part is a galvanic couple that will eat the magnesium first. Use isolating bushings, sealing washers, and compatible fastener coatings, and keep dissimilar metals out of direct contact wherever possible. Design also matters; avoid crevices and pockets that trap water and debris. Done right, magnesium parts survive field service, but the protection scheme is not optional, and it should be specified at the drawing stage rather than added later.
Specify WE43 when the part sees sustained load at temperature above roughly 120 C, where the common AZ alloys begin to lose strength and creep. WE43 is an yttrium and rare-earth magnesium alloy that holds useful mechanical properties up toward 250 C and resists creep far better, which is why it appears in applications near hot hydraulics, power electronics, or engine-adjacent locations. For Des Moines renewable-energy and machinery work, that might mean an enclosure or bracket sitting close to a power converter, or a housing in a high-duty gearbox. The trade-offs are cost and availability: WE43 costs substantially more than AZ91D and carries longer lead times because rare-earth-bearing magnesium is a specialty supply. If your part runs at or near room temperature, AZ91D delivers the weight savings and strength you need without the premium. Reserve WE43 for the genuinely hot, loaded applications where AZ-grade magnesium would soften or creep over the service life. Qualify it early because sourcing and material certs take longer to line up.
Magnesium is about 35 percent lighter than aluminum by density, so on a pure mass basis it wins clearly. Whether that translates to a worthwhile system-level advantage depends on the part. For handheld tools, operator-carried controls, and parts where ergonomic weight matters directly, magnesium pays off immediately because the user feels every gram. For rotating and reciprocating assemblies, lower mass means lower inertia, which can improve responsiveness and reduce wear on supporting structure. Where magnesium loses ground is stiffness per cost and corrosion resistance: aluminum needs less corrosion protection and is cheaper to buy and process. The honest answer for Des Moines buyers is that magnesium is worth it when weight is a primary design driver and you are willing to pay for corrosion protection and isolation hardware. If weight is merely nice to have, aluminum usually wins on total cost. Run the numbers on the full system, including coating and galvanic isolation, before committing, rather than deciding on raw density alone.
For wrought work, AZ31B is available as sheet, plate, and extruded shapes, which is what local fabricators use for formed covers, brackets, and welded assemblies. AZ31B bends with warm forming and welds with TIG using AZ61 or AZ92 filler, so it suits shops that want to fabricate rather than cast. For cast parts, AZ91D is the standard die-casting alloy and is also available for sand casting on lower-volume or larger geometries, while WE43 is sourced as a specialty casting alloy for elevated-temperature parts. The metro's mix of CNC machining, welding-fabrication, and assembly capability means you can take magnesium from stock to finished, coated part without shipping it far, provided the shop you pick handles magnesium regularly. When you request quotes, specify the grade, the form, and the required corrosion-protection system up front, and confirm material certifications, because magnesium alloy chemistry, especially the controlled iron and nickel limits in AZ91D, directly drives corrosion performance in the field.
Last updated: July 2026
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