Strength and processing stability
T651 state in the solution treatment after the addition of tensile straightening process, internal residual stress is significantly reduced, processing is not easy to deform, suitable for precision cutting or milling of high-precision parts (such as optical instruments, aluminum bracket, precision mold inserts).T652 through the compression process to eliminate stress, the residual stress is slightly higher than the T651, the processing of the need to set aside a greater amount of excess, but the strength of a slightly higher (about 5% -8% higher), suitable for It is suitable for non-precision parts (e.g., large welded frames) that require slightly higher strength.
Cost and productivity
T651 is 10-15% more expensive than T652 due to the complex straightening and stretching process, and the production cycle is longer. T652 is suitable for mass production and cost-sensitive scenarios (e.g., architectural façade keels, shelf beams).
Welding and corrosion resistance
The compression process of T652 makes the surface of the material more dense, and the risk of cracking in the heat-affected zone after welding is lower, which makes it suitable for parts requiring subsequent welding (e.g., railroad car frames). T651 requires grinding before welding due to the stretching process that may slightly reduce the surface homogeneity, but it is more corrosion-resistant after anodizing (e.g., outdoor billboard brackets).
Typical Application Scenarios
Scenarios where T651 is selected:
Precision instrument parts (e.g. laser equipment base)
Decorative profiles with high surface quality requirements (e.g. high-end furniture metal cladding)
Complex structural parts requiring multiple secondary processing
Scenarios for T652:
Large welded structures (e.g. bridge plates)
Low-cost and fast delivery of industrial frames (e.g. automated equipment racks)
General-purpose profiles with a high tolerance for light deformation (e.g. storage rack columns)
Selection decision points
Limited budget and no need for high precision → Priority T652
Frequent machining or tight tolerance control → T651 preferred
High welding requirements → T652 recommended (eliminates pre-treatment costs)
Long-term outdoor use → T651 is more resistant to oxidation (surface treatment required)
