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Buyers must prioritize the chemical composition and homogenization state. 6063 is an Al-Mg-Si alloy; ensure the Magnesium (0.45-0.9%) and Silicon (0.2-0.6%) levels strictly adhere to ASTM B221 or EN 573-3 standards. Additionally, verify the grain size and the absence of hydrogen porosity or non-metallic inclusions, as these factors directly impact the surface finish and mechanical properties of the final extruded profiles.
The homogenization treatment (typically at 540°C–580°C) is critical for 6063 billets to ensure the Mg2Si phase is uniformly distributed. This process improves extrudability, reduces die wear, and ensures the mechanical strength and surface quality of the end product. Always request a metallographic structure report from the supplier to confirm proper heat treatment.
For global markets, suppliers should provide ISO 9001 certification for quality management. If the billets are intended for the construction or automotive sectors, compliance with REACH and RoHS is often required to ensure the absence of hazardous substances. Furthermore, a Mill Test Certificate (MTC) according to EN 10204 3.1 is essential for traceability and material verification.
6063 is known as the 'architectural alloy.' It is primarily used for architectural extrusions such as window frames, door frames, and curtain walls due to its excellent anodizing response. It is also widely used in electrical components, heat sinks, and furniture manufacturing where a high-quality surface finish and moderate strength are required.
Aluminium prices are tied to the LME (London Metal Exchange) or SHFE (Shanghai Futures Exchange). To manage risk, buyers should negotiate a pricing formula (e.g., LME Base Price + Fabrication Premium) rather than a fixed price. Utilizing Made-in-China.com's Secured Trading services can also provide a layer of financial protection during market fluctuations.
Engage a third-party inspection agency (like SGS or Intertek) to perform a spectrochemical analysis to verify the alloy grade. Conduct a ultrasonic flaw detection test to check for internal cracks or slag inclusions. Ensure the billet ends are smooth and free from excessive oxidation or 'cold shuts' which can cause extrusion defects.
Aluminium billets are heavy and prone to surface oxidation if exposed to moisture. Ensure the billets are securely strapped with steel bands on wooden pallets or skids. Request seaworthy packaging, including plastic wrapping or desiccant bags, to prevent white rust during long-transit maritime shipping. Always clarify the Incoterms (e.g., CIF vs. FOB) to define responsibility for insurance and local port charges.
Prioritize Audited Suppliers on Made-in-China.com, as they have undergone rigorous on-site inspections. Check the supplier's annual production capacity to ensure they can handle bulk orders and verify their export history to your specific region to ensure they are familiar with local customs requirements and anti-dumping duties.
