From August 25 to 26, the sixth revision working meeting of the national standard GB/T 33910 "Extruded profiles of aluminium and aluminium alloys for automobiles" was held in Tianchang, Anhui Province. The meeting was hosted by Anhui Xinbo Aluminum Co., Ltd.
Discussions on the main text of the standard and more than ten key technical topics brought together representatives from the National Technical Committee for Nonferrous Metals Standardization, automotive OEMs, aluminium profile manufacturers, testing institutions, and research institutes, who gathered in Chuzhou for in-depth exchanges and technical discussions.
1. Why Does a National Standard Revision Meeting Matter?
The current version of GB/T 33910, Aluminium and Aluminium Alloy Extruded Profiles for Automobiles, was issued in 2017 and implemented in 2018. It provides systematic requirements covering product classification, dimensional tolerances, mechanical properties, surface quality, corrosion resistance, and other key aspects.
This trend, driven by the rapid growth of new energy vehicles and the continued push for automotive light-weighting, is placing higher requirements on both material performance and the standards that govern it, as aluminium extrusions are being increasingly used in key components such as body structures, bumper beams, and battery trays.
Questions such as how products should be classified, how recycled aluminium can be applied, and how corrosion resistance and fatigue performance should be evaluated all need to be further clarified in line with evolving industry needs.
Standards are not only the industry's “blueprint”, but also a common language shared by both suppliers and customers.
2. Two-Day Agenda Focused on More Than Ten Key Technical Topics
Day One
On August 25, the meeting officially opened with remarks from representatives of Xinbo and the National Technical Committee for Nonferrous Metals Standardization, followed by an update from the drafting team on the progress of the standard revision.
The first day focused on a wide range of technical topics, including product classification, dimensional tolerances, weld seam layout, comparative testing of primary and recycled aluminium, revisions to mechanical property requirements, tensile properties after simulated bake treatment, the influence of surface roughness on salt spray test results (CASS/NSS), as well as axial compression, lateral compression, fatigue performance, and bending performance of aluminium profiles.
Day 2
On August 26, the discussion extended from "intrinsic performance" to "surface quality." Presentations were delivered successively on the following topics: summary of collected corrosion performance data, SWAAT (Seawater Acetic Acid Accelerated Test) corrosion testing, the effect of extrusion scratch depth on salt spray corrosion, and the salt spray corrosion test protocol. Subsequently, discussions were held on coating performance data, as well as the optimization of the main text and appendices concerning surface quality. Technical requirements for FDS (Flow Drill Screw) testing, welding suitability, and riveting suitability were then presented in turn. The appendices for Process Control and for Profile Qualification were also reported and completed.
At the conclusion of the meeting, the participating delegates reviewed and confirmed the resolutions adopted during this phase, and proceeded to announce and assign the tasks for the next stage.
3. Key Trends Emerging from the Agenda: Recycling, Corrosion, and Process Control Take Center Stage
A closer look at the two-day agenda reveals three particularly noteworthy directions.
I. The "Coexistence" of Primary and Recycled Aluminum
With the increasing use of recycled aluminum in automotive profiles, issues such as recycled ingot quality, alloy element control, and performance consistency are becoming new challenges that the standard must address. The consecutive progression of two rounds of test protocols indicates that this is no longer an option but an industrial reality.
II. more detailed characterization of corrosion performance
Multiple salt spray tests—including CASS, NSS, and SWAAT—are being conducted in parallel. Research is continuously delving deeper into microscopic details affecting corrosion resistance, from surface roughness to extrusion scratch depth. This directly impacts the durability and long-term service life of body components.
III. The "New Standards" for Material Properties
The increasingly detailed and rigorous requirements for mechanical properties, compression performance, and bending performance signify that the standard is not only defining new requirements for automotive profiles but also reinterpreting the fundamental safety baseline for automobiles.
4. Xinbo Contributes to the Development of the National Standard
Xinbo, a representative enterprise in China’s aluminium extrusion industry, is deeply engaged in the R&D, production, and sales of new energy vehicle parts, solar aluminium frames, recycled aluminium, and aluminium products. With end-to-end capabilities spanning alloy material development through to assembly component manufacturing, Xinbo has actively participated in the revision of GB/T 33910.
From contributing to the drafting of the standard to hosting the revision meeting, Xinbo continues to bring frontline manufacturing experience into the standard-setting process while translating industry consensus back into production practice. The smooth progress of the two-day meeting was also supported by careful event coordination and comprehensive logistical services.
Closing Remarks
The value of a standard lies in turning shared industry experience into rules that can be implemented, measured, and verified.
After two days and discussions covering more than ten key topics, the sixth revision meeting of GB/T 33910 reached an important milestone. Participants confirmed the decisions made at this stage and clarified the tasks for the next phase of the revision.
Going forward, all participating organizations will continue to work with data as the foundation and practical application as the guide, further refining this national standard that supports both automotive lightweighting and the high-quality development of the aluminium processing industry.
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