Magnesium rear body 21.8% lighter: three reports to demand

A magnesium rear body means the sourcing benchmark moves from steel-to-aluminium to aluminium-to-magnesium. Seres and Baowu ran 48 tasks on the casting, 12 first-of-a-kind. Magnesium weighs two-thirds of aluminium and a quarter of steel. For Gulf buyers the value is salt-spray survival, not grams.

Magnesium stayed out of load-bearing parts on two counts: heat and corrosion. The Chongqing team hit both at once. Rare-earth alloying added about 20% over conventional formulas, semi-solid casting added density and accuracy. The part now runs in heavy salt spray, and the same line feeds dashboard beams.

The rear body is 21.8% lighter than aluminium, with performance up over 10%. The beam is 45-50% lighter than steel, the e-drive housing 30%. Weight never becomes range one-to-one. A 10% cut buys single-digit range, so book 21.8% as material saved, not battery saved.

Corrosion decides resale in Gulf ports and humid West Africa. Magnesium is the least noble of the three, so every bolted joint needs isolation washers and coated fasteners. A chipped edge behaves nothing like a polished sample. That gap shows at auction three years later.

Before signing, request the alloy designation and temper, an ASTM B117 report on scribed samples with hours stated, and the isolation drawing for dissimilar joints. Add the field failure list for the same part. Ask for hours, not a pass stamp. Send a configuration list for a landed-cost split by market.

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This article is published by EZ Auto. EZ Auto (Cheyixing Automobile Import & Export) specializes in exporting Chinese vehicles — new, used and parts — serving Latin America, Central Asia & CIS, Africa, the Middle East and the EU, with order-based sourcing, inspection with photo report, export documentation and ocean freight in one place.