🪶 MAGNESIUM
Magnesium Sourcing and Machining in Erie, PA
Magnesium is the lightest structural metal in commercial use, roughly two-thirds the density of aluminum, and Erie's deep metalworking bench has the equipment and habits to handle it safely. From AZ31B sheet for bracketry to WE43 castings for high-temperature service, buyers sourcing in northwestern Pennsylvania can pair this material with shops already serving locomotive, automotive, and renewable-energy customers.
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Why Erie Buyers Specify Magnesium
Weight is the whole argument. At about 1.74 g/cm3, magnesium undercuts aluminum (2.70) and steel (7.85), and for a city whose marquee product is a 400,000-pound locomotive, the logic of trimming mass anywhere it does not carry structural penalty is well understood. Magnesium shows up in transmission housings, seat frames, instrument panel beams, and electronics enclosures where every removed pound either improves efficiency or frees capacity elsewhere.
Erie's automotive and heavy-equipment suppliers are the natural buyers. AZ91D die castings are common in powertrain and bracket applications because the alloy flows well in high-pressure die casting and resists corrosion better than older magnesium grades. AZ31B, a wrought alloy, serves where parts get rolled, extruded, or formed rather than cast. WE43, an yttrium and rare-earth alloy, is the specialty pick when service temperatures climb past 200C, which is why it lands in aerospace gearbox housings and motorsport components.
The stiffness-to-weight and damping characteristics also matter. Magnesium damps vibration better than aluminum, a useful property in the rotating and reciprocating machinery that Erie shops have built for over a century.
Grade Selection: AZ31B, AZ91D, and WE43
AZ31B is the workhorse wrought grade, nominally 3% aluminum and 1% zinc. It comes as sheet, plate, and extrusion, takes forming and welding reasonably well, and gives a tensile strength around 260 MPa in the H24 temper. Erie fabricators handling sheet and plate for enclosures or panels will reach for AZ31B first because it behaves predictably under brake and roll operations.
AZ91D is the dominant die-casting alloy, with roughly 9% aluminum and 1% zinc plus tightly controlled iron, nickel, and copper limits that give it good corrosion resistance. It is the grade behind most magnesium automotive castings. If your Erie program involves high-volume cast brackets or housings, AZ91D is almost certainly the starting specification.
WE43 is the high-performance outlier, alloyed with yttrium and neodymium-rich rare earths. It holds strength and creep resistance at elevated temperature and is used in aerospace, defense, and some bioresorbable medical work. It costs considerably more and demands more careful process control, so it is specified only when AZ-series alloys cannot meet the temperature or strength requirement.
Machining, Welding, and Fire Safety
Magnesium machines fast. It cuts with low cutting forces and excellent surface finish, and shops can run aggressive feeds and speeds compared with steel or titanium. The catch is fire risk: fine magnesium chips and dust ignite, and a magnesium fire cannot be put out with water. Erie shops that machine it use sharp tooling to keep chips coarse, flood with the right coolant, keep chip volumes managed, and stock Class D extinguishing media. A shop's familiarity with these protocols is the single most important qualifier when you source magnesium machining.
Welding AZ31B is routine with TIG or MIG using matching filler in an inert argon shield. Castings in AZ91D can be welded for repair, though porosity and heat-affected zone behavior require care. WE43 welding is specialized and usually done only by shops with aerospace experience.
Because Erie's metalworking base grew up around heavy steel and iron, confirm any prospective supplier actually runs magnesium regularly rather than treating it as an occasional job. The safety discipline is learned, not improvised.
Corrosion Protection and Finishing
Bare magnesium is reactive and prone to galvanic corrosion when coupled with dissimilar metals, so finishing is rarely optional. The standard routes are chromate or chrome-free conversion coatings (per MIL-DTL-5541-style chemistries for adjacent alloys, with magnesium-specific equivalents), anodizing processes such as Tagnite or Keronite-type plasma electrolytic oxidation, and powder or e-coat topcoats.
For Erie buyers building parts that see road salt, marine environments, or outdoor energy installations, specifying the finish up front prevents field failures. Design also matters: isolating magnesium from steel fasteners with proper coatings or non-conductive washers prevents the galvanic cell that otherwise eats the magnesium first.
Ask finishing partners about their experience with magnesium specifically, since the conversion chemistries differ from the aluminum processes most regional finishers run by default.
Frequently Asked Questions
Yes, but only shops that run magnesium regularly should be trusted with it. The fire hazard is real: fine chips and grinding dust ignite, and water makes a magnesium fire worse because it reacts to release hydrogen. Experienced shops manage this by keeping tooling sharp to produce coarse rather than powdery chips, using appropriate coolants and dust collection rated for combustible metals, controlling chip accumulation, and stocking Class D dry-powder extinguishers near the machines. Erie's metalworking base is broad, but much of it grew up on steel and iron, so you should specifically verify a prospective supplier machines magnesium as routine work rather than an occasional one-off. A shop with documented procedures, trained operators, and the right extinguishing media is the right partner. One that hesitates or treats it casually is not. When you list a magnesium job on ManufacturingBase, ask suppliers directly about their fire-safety protocols and recent magnesium production history before awarding the work.
For a high-volume cast automotive bracket or housing, AZ91D is almost always the right starting point. It is the dominant high-pressure die-casting alloy, with about 9% aluminum and 1% zinc, and its tightly controlled iron, nickel, and copper content gives meaningfully better corrosion resistance than older magnesium die-casting alloys. It flows well in the die, fills thin sections, and is proven across the automotive industry for powertrain brackets, seat structures, and electronics housings. If your part is formed from sheet or extrusion rather than cast, AZ31B is the wrought alternative, offering good formability and weldability with tensile strength around 260 MPa in temper. Reserve WE43 for parts that must survive elevated temperatures above roughly 200C or need superior creep resistance, since it costs substantially more and requires tighter process control. Erie's automotive and heavy-equipment suppliers handle both cast and wrought magnesium, so match the grade to your forming method first, then confirm the corrosion and temperature requirements.
In nearly all cases, yes. Bare magnesium is chemically reactive and especially vulnerable to galvanic corrosion whenever it contacts dissimilar metals like steel fasteners. Common protection routes include chromate or chrome-free conversion coatings, plasma electrolytic oxidation anodizing such as Tagnite or Keronite-style processes, and powder or e-coat topcoats applied over the conversion layer. The right choice depends on the service environment: a part exposed to road salt, marine spray, or outdoor energy installations needs a more robust system than an enclosed indoor component. Design details matter as much as coatings. Isolating magnesium from steel with non-conductive washers or fully coated fastener interfaces prevents the galvanic cell that would otherwise corrode the magnesium preferentially. When sourcing in Erie, confirm your finishing partner has specific magnesium experience, because the conversion chemistries differ from the aluminum anodizing most regional finishers run as their default process. Specify the finish on your drawing up front to avoid field failures later.
Magnesium is about 35% lighter than aluminum by volume, at roughly 1.74 g/cm3 versus 2.70 g/cm3, which is the core reason designers reach for it when aluminum is already on the table but not light enough. It also damps vibration better than aluminum, a genuine advantage in rotating and reciprocating machinery of the kind Erie has built for generations. The tradeoffs are real, though. Magnesium has lower absolute strength and stiffness than most aluminum alloys, so parts may need slightly more material or geometry to match performance, partly offsetting the weight win. It is more reactive and requires protective finishing where bare aluminum often does not. It costs more per pound and demands fire-safe machining. For these reasons, magnesium tends to win in specific applications, electronics enclosures, seat frames, instrument panel beams, transmission housings, rather than as a blanket aluminum replacement. Erie shops serving automotive and aerospace customers can run both, so the practical move is to weigh the per-part weight savings against finishing and machining cost for your specific component.
Last updated: July 2026
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