Aluminum Donuts for Deoxidation & Industry

Aluminum donuts, also known as aluminum rings or aluminum deoxidation pieces, are a key product in the portfolio of Transformación Puebla, S.A. de C.V. Weighing approximately 1 kilogram each with an annular (toroidal) shape, these pieces are designed for applications requiring a lightweight aluminum unit that is easy to handle and dissolves rapidly in molten metal. Our plant in San Pedro Cholula, Puebla, manufactures aluminum donuts with controlled chemical composition verified by spectrometry, ensuring every piece meets the customer's exact specifications.

The most widespread use of aluminum donuts is in the steel industry, where they serve as a deoxidizing agent in steel production. During steelmaking, dissolved oxygen in the liquid metal must be removed to prevent defects in the final product such as porosity, inclusions, and brittleness. Aluminum, with its high affinity for oxygen, is the preferred deoxidizer in steel mills across Mexico. Aluminum donuts from Transformación Puebla offer significant advantages for this process: their uniform size of approximately 1 kg allows precise dosing of the amount of aluminum added to the furnace or steel ladle, their annular shape facilitates both mechanized and manual feeding, and their controlled composition guarantees a predictable and efficient reaction.

Beyond steel deoxidation, our aluminum donuts find application in various industries. In aluminum casting processes where controlled metal additions are required, donuts offer a convenient weight unit. In the chemical industry, they are used as an aluminum source in reactions requiring high-purity metallic aluminum with a known composition. They are also employed in ferroalloy manufacturing and in thermochemical processes where the annular geometry facilitates loading and accelerates aluminum dissolution rate.

The manufacturing process for our donuts follows the same rigorous standards we apply to all our products. Aluminum is melted in our reverberatory, rotary, and tilting furnaces, and undergoes full metallurgical treatment: fluxing for slag and oxide removal, rotary degassing with nitrogen to minimize dissolved hydrogen content, precise chemical composition adjustment with alloying elements, and spectrometric verification with our Thermo Scientific ARL 3460 before every pour. The clean, treated metal is poured into donut molds that produce pieces of consistent annular shape and uniform weight.

We manufacture donuts in a wide range of alloys to meet the specific requirements of each application. For steel deoxidation, we offer compositions with high aluminum content and low levels of elements that could affect steel quality. For casting and addition applications, we produce donuts in the same alloy families as our ingots: AlSi7, AlSi10, AlSi11, 380, 413, and custom compositions. The customer defines the alloy, and we manufacture it with precision.

Our location in San Pedro Cholula, Puebla, positions us strategically to serve the major steel mills and steel plants in Mexico, as well as foundries in the Puebla-Tlaxcala automotive cluster and the Bajio industrial corridor. With ISO 9001:2015 certification, production capacity of 4,000 metric tons per year, and over 35 years of experience in the Mexican market, Transformación Puebla is the aluminum donut supplier your process needs.

Every batch of donuts is delivered with its chemical analysis certificate and radioactivity measurement, providing the traceability and confidence that today's supply chains demand. Contact us to discuss your requirements for volume, alloy, and delivery schedule.