In the field of building curtain walls and industrial profiles, the T5 and T651 tempers of 6063 aluminum alloys often cause confusion in material selection. Based on the GB/T 5237.1 standard and combined with Gnee Aluminum's ten years of engineering data, this article analyzes the core technical differences and selection strategies between the two.
Key Technical Differences:
T5 temper offers good plasticity and moderate strength but lacks the high precision needed for some structural applications.
T651 eliminates more than 90% of internal stress through a stretch-straightening process, but this reduces some of its plasticity. It is therefore more suitable for high-precision structural parts.
Selection Logic and Gnee Engineering Modules
Building Curtain Wall Engineering
200m Super High-Rise Project in Shenzhen
Material Selection: 6063-T5 (120mm×80mm aluminum square tube)
Use Case: This selection utilizes the alloy's high elongation (measured at 14.5%) to absorb wind-induced deformation. It was optimized using Gnee's intelligent temperature control aging furnace (180℃±3℃ for 4 hours), which increased the welding pass rate to 98.6%.
Supporting Modules:
Online stress detector (accuracy ±2MPa)
Surface anodizing line (film thickness 20μm)
Precision Guide Rail Manufacturing
CNC Machine Tool Company
Material Selection: 6063-T651 (Ø50mm aluminum bar)
Use Case: The material benefits from the Gnee stretch-straightening unit (accuracy 0.02mm/m), which controls deformation and ensures that the flatness after machining reaches 0.015mm, a 22% improvement over the processing efficiency of T5 materials.
Supporting Modules:
Laser leveling system
Metallographic analysis laboratory
Selection Recommendations
6063 T5 aluminium round bar is preferred for dynamic load scenarios, such as earthquake-resistant curtain walls.
6063 T651 extruded aluminum bar is ideal for precision-machined parts, such as semiconductor equipment guide rails.
Gnee provides full-process services, from material selection to process optimization, and has helped 132 engineering projects achieve both technical and economic standards.
