Aluminum Alloys for the Automotive Industry

Mexico's automotive industry is one of the most dynamic in the world, and the state of Puebla occupies a central role in its development. With Volkswagen's plant in the city of Puebla — where vehicles such as the Jetta, Taos, and Tiguan are produced — Audi's plant in San Jose Chiapa dedicated to the Q5, and an ecosystem of over 300 Tier 1 and Tier 2 suppliers in the region, the Puebla-Tlaxcala automotive cluster represents one of the largest vehicle manufacturing hubs in Latin America. Transformación Puebla, S.A. de C.V. is strategically located in San Pedro Cholula, less than 30 minutes from the region's main industrial zones, allowing us to respond with agility to the needs of our automotive customers.

In the manufacture of aluminum auto parts, the alloy's chemical composition is not a minor detail: it is the determining factor in the performance of the finished part. An engine block cast with an out-of-spec alloy may exhibit excessive porosity, low mechanical strength, or machinability problems that generate costly rejections on the production line. That is why every ingot leaving our plant has been verified with our Thermo Scientific ARL 3460 spectrometer and accompanied by a chemical analysis certificate guaranteeing compliance with the specification.

For the casting of aluminum wheels and rims, the reference alloy is A356.2 (AlSi7Mg0.3). This alloy offers the ideal combination of fluidity for mold filling, mechanical strength after T6 heat treatment, and sufficient elongation to withstand road impacts. What distinguishes a premium-quality A356.2 is its low iron content: we maintain Fe at levels equal to or below 0.12%, which minimizes the formation of beta-AlFeSi intermetallic phases that would embrittle the part. To achieve this, we work with a primary aluminum base (P1020, P0610) and strict trace element control.

For engine blocks and cylinder heads, the 380 alloy (A380 / AlSi9Cu3) is the most widely used option in die casting. Its high silicon content provides excellent fluidity and wear resistance, while copper enhances mechanical strength at elevated temperatures — a critical condition in powertrain components. We manufacture 380 ingots with tight composition ranges, ensuring that each batch melts predictably in our customers' injection machines.

For transmission housings, engine covers, and thin-wall structural components, we recommend the A383 alloy (AlSi10Cu2) or ADC12. This alloy offers better fill in thin sections than the 380 and presents lower hot cracking tendency, which is essential in complex geometries with variable wall thicknesses. We also manufacture AlSi11 alloys (type 413/A413) for parts requiring maximum fluidity and pressure tightness, such as oil pans and water pump housings.

Beyond standard alloys, we work with our automotive customers on the development of specific compositions that optimize variables such as fatigue resistance, thermal conductivity, or heat treatment response. Our production flexibility allows us to manufacture batches from trial tonnages to continuous supply contracts with scheduled deliveries.

Our location does not just connect us to the Puebla automotive cluster: we are four hours from the Queretaro-Bajio industrial corridor, where Honda, Mazda, Toyota, and GM plants operate, and within competitive distance of Monterrey and Saltillo, home to KIA, Chrysler, and other manufacturers. This central geographic position allows us to be a reliable aluminum alloy supplier for the automotive industry throughout Mexico.

We hold ISO 9001:2015 certification, provide complete traceability for every batch, perform radioactivity detection on raw materials and finished products, and bring over 35 years of experience serving auto parts foundries that are, in turn, direct suppliers to the OEMs.