Constellium has been granted a patent for a strip designed for brazed heat exchangers, featuring a core made of a specific aluminum alloy composition. The strip is coated with a brazing alloy or sacrificial anode for corrosion protection. The patent covers the unique composition and cladding process. GlobalData’s report on Constellium gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Constellium, Constellium's grant share as of March 2024 was 48%. Grant share is based on the ratio of number of grants to total number of patents.

Aluminium strip for brazed heat exchangers

Source: United States Patent and Trademark Office (USPTO). Credit: Constellium SE

A recently granted patent (Publication Number: US11932922B2) discloses a strip designed for the production of brazed heat exchangers. The strip features a core made of an aluminum alloy with specific composition percentages of various elements, including silicon, iron, copper, manganese, and magnesium. Additionally, the strip is clad with a coverage alloy on one or both faces, which can be a brazing aluminum alloy or an alloy acting as a sacrificial anode to prevent corrosion. The brazing alloy composition includes silicon, iron, copper, manganese, magnesium, zinc, titanium, and other elements within defined weight percentages, with the sacrificial anode being alloy AA7072.

Furthermore, the patent claims cover various aspects related to the strip, including the presence of an interlayer aluminum alloy between the core and the brazing aluminum alloy, enhancing corrosion resistance without compromising mechanical strength or brazability. The methods for manufacturing the strip involve a series of steps such as casting, preheating, hot rolling, cold rolling, and annealing, with variations depending on whether homogenization is included in the process. Cladding with brazing aluminum alloy and interlayer aluminum alloy at specific stages is also detailed in the patent claims, providing a comprehensive guide for the production of high-quality strips for heat exchanger applications.

To know more about GlobalData’s detailed insights on Constellium, buy the report here.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.