ISO 209:2024

Overview

ISO 209:2024 - Wrought aluminium and aluminium alloys - Chemical composition - specifies the chemical composition limits for wrought products and ingots intended to be wrought. This second edition consolidates and updates previous material (including elements from ISO 6361-5 and ISO 6362-7) and aligns alloy designations with the Aluminum Association (Teal sheets). The standard provides composition limits (percent by mass), writing and rounding rules, element sequencing, and guidance on how to treat aluminium as a remainder or minimum for unalloyed grades.

Key topics and requirements

• Scope and applicability: Targets wrought aluminium products and ingots intended for subsequent wrought processing.
• Chemical composition limits: Table 1 lists limits for major wrought alloys (examples include 1050, 1060, 1100, 2024, 3003, 3102 and others), with alloying elements given as ranges and impurities as maximums. Aluminium is specified as a remainder for alloys and as a minimum for unalloyed aluminium.
• Writing rules: Prescribes decimal-place formatting for limits depending on concentration ranges (e.g., different precision for