Li Auto and Changzhou Duoli Win Gold for Innovative Magnesium Alloy Rear Floor at 2026 Shanghai Die Casting Exhibition

Published: Jul 30, 2026 17:57

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【SMM Magnesium Express】Recently, at the 2026 Shanghai Die Casting Exhibition, the integrated die-cast magnesium alloy rear floor jointly submitted by Li Auto and Changzhou Duoli Auto Parts won the "Gold Award Casting". Currently, the integrated die-casting in the industry mostly adopts aluminum alloy solutions, which faces a bottleneck in weight reduction space. As a strategic lightweight material, magnesium alloy can reduce the weight by about one third compared with aluminum alloy, and has outstanding vibration and noise reduction performance. However, the die-casting of large body load-bearing parts is prone to porosity and cracks, making it difficult to achieve mass production, and most projects only stay in the sample stage. Through self-developed magnesium alloy materials and optimized structure and die-casting process, Li Auto has achieved a 10% increase in casting toughness and a 40% increase in casting fluidity, breaking through the pain point of mass production of large magnesium alloy thin-walled parts. This component replaces the traditional multi-part welding structure, improving body rigidity; the weight reduction can improve the vehicle's power consumption and range; the inherent vibration reduction advantage of the material can also optimize the chassis NVH performance, balancing safety, energy efficiency and driving quietness. Li Auto has also become one of the few domestic car companies to realize the mass production of this technology.

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