GB/T 29503-2020 in English

Core changes in the standard revision

Detailed explanation of key performance indicators

Implementation suggestions

1. The stress corrosion sensitivity factor (SCF) requirements of 7xxx series alloys should be clearly marked when purchasing materials
2. Fractograph inspection must be carried out on plates with a thickness of ＞25mm
3. In the design of new models, priority should be given to newly added high-strength corrosion-resistant alloys such as 2D70/7A85

Technology evolution analysis

This standard reflects three development directions of aluminum alloy materials: 1) Improving metallurgical quality by controlling hydrogen content; 2) Introducing a three-dimensional fracture toughness evaluation system; 3) Strengthening environmental adaptability indicators (newly added corrosion test methods in Appendix B/C). The conductivity requirement of 7475T7351 is increased to ≥23.2MS/m, corresponding to 40%IACS, meeting the electromagnetic compatibility requirements of the new generation of aircraft.