What Is the Difference Between 7075-T6 and 7075-T651?
The 7075-T651 aluminum plate is processed with an additional stretching step after the standard T6 heat treatment to relieve internal residual stresses. This stress-relief process makes 7075-T651 especially suitable for thick aluminum plates and precision machining applications. As a result, the likelihood of distortion or warping after machining is greatly reduced compared with standard 7075-T6 aluminum plates.
Is 7075 T6 Aluminum Plate Suitable for CNC Machining?
Yes. 7075 T6 aluminum plates and blocks offer excellent machinability and are widely used for CNC machining. After T6 or T651 heat treatment, the alloy achieves significantly higher hardness and strength, allowing it to withstand high cutting forces while maintaining good dimensional accuracy. Due to its high hardness, proper tool selection and optimized cutting parameters are essential for achieving the best machining results.
How Is the Corrosion Resistance of 7075 Aluminum?
The corrosion resistance of 7075 aluminum alloy is superior to that of the 2xxx series but slightly inferior to 6061 aluminum. For applications exposed to humid or marine environments, GNEE recommends selecting corrosion-resistant tempers such as T73 or T76, which provide improved resistance to stress corrosion cracking compared to standard 7075 T6 aluminum plates.
Can 7075 Aluminum Plates Be Welded?
Welding 7075 aluminum plates is generally not recommended, as the welded zones are prone to hot cracking and significant strength loss. Although post-weld natural aging may recover part of the mechanical strength, mechanical fastening methods-such as bolts, rivets, or structural fasteners-are usually preferred when working with 7075 T6 aluminum plates.
Does 7075 T6 Aluminum Plate Deform Easily During Machining?
When stress-relieved tempers such as T651, T7351, or T7651 are used, the risk of deformation during machining is minimal. For thick 7075 aluminum plates, GNEE advises selecting products that have undergone ultrasonic testing to ensure internal structural integrity and eliminate hidden defects.
What Is the Difference Between 7075 and 6061 Aluminum?
7075 aluminum plates provide significantly higher strength, with tensile strength reaching up to 570 MPa, making them ideal for high-load and high-stress applications. However, their weldability and corrosion resistance are lower than those of 6061 aluminum. When maximum strength is the primary requirement, 7075 T6 aluminum plate is the preferred choice.
Do Thick 7075 Aluminum Plates Have Internal Pores or Cracks?
The thick-section 7075 aluminum plates supplied by EN 10204 standards. This ensures the absence of internal defects such as pores, inclusions, or cracks, delivering consistent quality and reliable performance for demanding industrial applications.
