6063 Aluminum Alloy Profiles: Composition, Standards, and Technical Parameters
Overview of 6063 Aluminum Alloy Profiles
6063 aluminum alloy profiles are heat-treatable aluminum materials primarily composed of aluminum, with added silicon, magnesium, manganese, and trace elements. They are widely used in architectural aluminum profiles and industrial aluminum profiles due to their excellent formability, corrosion resistance, and stable mechanical properties.
At GNEE, 6063 aluminum alloy profiles are produced in strict accordance with GB/T 5237.1-2008 standards. Different aluminum profile materials vary in chemical composition, tensile strength, yield strength, hardness, and dimensional precision. Below is a systematic introduction to the key industrial parameters of 6063 aluminum alloy profiles.
6063 Aluminum Alloy Chemical Composition (GB/T 5237.1-2008)
The chemical composition of 6063 aluminum alloy is tightly controlled to ensure consistent performance.
Typical Chemical Composition of 6063 Aluminum Alloy:
Silicon (Si): 0.20 – 0.60
Iron (Fe): ≤ 0.35
Copper (Cu): ≤ 0.10
Magnesium (Mg): 0.49 – 0.90
Chromium (Cr): ≤ 0.10
Manganese (Mn): ≤ 0.10
Zinc (Zn): ≤ 0.10
Titanium (Ti): ≤ 0.10
Other elements (single): ≤ 0.05
Other elements (total): ≤ 0.15
Aluminum (Al): Balance
Any aluminum profile batch containing a single rod with non-conforming chemical composition is considered fully unqualified and prohibited from market use.
6063 Aluminum Alloy Profile Identification and Standards
Extruded 6063 aluminum alloy profiles must clearly indicate:
Alloy grade
Chemical composition
Product dimensions
Temper condition
Applicable standard
Standards applied:
Architectural aluminum profiles: GB/T 5237-2008
Industrial aluminum profiles: GB/T 6892-2006
Overall, GB/T 5237-2008 imposes stricter requirements.
A typical designation example:
6063-T5 421001 × 6000 GB/T 5237-2008
(Standard length: 6000 mm per piece)
Mechanical Properties of 6063 Aluminum Alloy Profiles (T5 / T6)
6063-T5 Aluminum Alloy Mechanical Properties
Tensile strength: ≥ 160 MPa
Yield strength: ≥ 110 MPa
Elongation: ≥ 8%
Vickers hardness (HV): ≥ 58
Webster hardness (HW): ≥ 8
6063-T6 Aluminum Alloy Mechanical Properties
Tensile strength: ≥ 205 MPa
Yield strength: ≥ 180 MPa
Elongation: ≥ 8%
6063-T5 is the most commonly supplied temper, while 6063-T6 is selected for applications requiring higher hardness and strength.
Heat Treatment States of 6063 Aluminum Alloy Profiles
6063-T5 Aluminum Alloy Heat Treatment
6063-T5 profiles are cooled after high-temperature extrusion and then artificially aged, without additional cold working. Cooling is typically achieved through air or natural cooling, resulting in:
Low deformation coefficient
Stable mechanical properties
Consistent hardness
This is the most widely used temper for both architectural and industrial aluminum profiles.
6063-T6 Aluminum Alloy Heat Treatment
6063-T6 profiles undergo rapid water quenching after extrusion, followed by artificial aging at higher temperatures and longer durations. This process increases hardness, plasticity, and toughness, making T6 suitable for higher load requirements.
Dimensional Tolerance of 6063 Aluminum Alloy Profiles
Wall Thickness Tolerance of 6063 Aluminum Alloy
Dimensional tolerances are divided into High Precision Grade and Ultra-High Precision Grade. The higher the grade, the smaller the allowable deviation.
6063 aluminum alloy profiles generally follow the High Precision Grade, measured using precision calipers and specialized instruments. Any profile exceeding tolerance limits renders the entire batch unqualified unless individually inspected and separated.
Flatness Tolerance of 6063 Aluminum Alloy Profiles
The allowable flatness gap depends on the nominal width of the profile. Within any 25 mm width, strict flatness limits apply to ensure surface quality and assembly accuracy.
Bending Tolerance of 6063-T5 Aluminum Alloy Profiles
Bending tolerance is a critical indicator of dimensional accuracy. Unless otherwise specified, 6063-T5 aluminum alloy profiles are evaluated according to High Precision Grade bending standards.
Measurement method:
Place the profile on a flat surface, allow it to stabilize naturally, and measure the maximum gap between the profile and the surface along its length. This value represents the bending deviation.
Surface Defect Allowance for 6063 Aluminum Alloy Profiles
Permissible Surface Defect Depth
6063-T5
Decorative surface: ≤ 0.03 mm
Non-decorative surface: ≤ 0.07 mm
6063-T6
Decorative surface: ≤ 0.06 mm
Non-decorative surface: ≤ 0.10 mm
Profiles must be free of cracks, bubbles, orange peel, and severe pitting corrosion. Any profile exceeding allowable defect depth is considered unqualified.
Die Extrusion Mark Limits for 6063 Aluminum Alloy
During extrusion, die marks may occur. For 6063 aluminum alloy profiles, the maximum allowable extrusion mark depth is 0.03 mm.
If the value exceeds this limit, the profile may suffer dimensional inaccuracies or reduced mechanical performance. Minor marks may be repaired, but deep marks require the entire batch to be scrapped.
Conclusion: Why Choose GNEE 6063 Aluminum Alloy Profiles
6063 aluminum alloy profiles are valued for their balanced strength, excellent corrosion resistance, precise dimensional control, and superior surface quality. Strict standards ensure consistency, safety, and long-term performance.
At GNEE, every batch of 6063-T5 and 6063-T6 aluminum alloy profiles undergoes rigorous inspection to meet national standards and industrial requirements, ensuring reliable performance in architectural, industrial, and structural applications worldwide.
