Overview
Extruded billet is a semi-finished metal product primarily made of aluminum or copper alloys, serving as the starting material for extrusion processes. These cylindrical or rectangular blocks are cast and homogenized to achieve uniform metallurgical properties before being fed into extrusion presses. In industrial contexts, billets are distinguished by their alloy composition (e.g., 6061, 6063 aluminum alloys) and precise dimensions tailored to downstream extrusion equipment. The global market for extruded billets is driven by demand from construction (window frames, curtain walls), transportation (automotive rails), and electrical industries.
Physical and Chemical Properties
The properties of extruded billets vary significantly by alloy type. Aluminum billets typically exhibit density around 2.7 g/cm³, with thermal conductivity ranging from 120–220 W/m·K depending on temper and alloying elements. Microstructural homogeneity is critical, achieved through controlled cooling rates during casting. Key mechanical properties include tensile strength (70–300 MPa for common aluminum alloys) and elongation (8–20%). Chemical resistance depends on alloy composition – aluminum billets form a protective oxide layer, while copper alloys offer superior corrosion resistance in specific environments. Surface quality standards typically require minimal pits or cracks (per ASTM B221).
Main Applications
Approximately 60% of extruded aluminum billets are processed into architectural profiles for doors, windows, and curtain walls, benefiting from aluminum's strength-to-weight ratio and corrosion resistance. In transportation, billets are extruded into automotive chassis components and heat exchangers. The electrical industry utilizes high-conductivity copper billets for busbars and connectors. Emerging applications include lithium-ion battery casings (requiring precise alloy 3003 or 5052 billets) and renewable energy structures. Each application demands specific alloy grades – for example, 6061-T6 for structural components versus 1100 for chemical processing equipment.
Safety and Storage
Billets require dry storage (relative humidity <60%) to prevent surface oxidation or water staining. Stack height should not exceed 2 meters to avoid deformation, with wooden separators between layers. Indoor storage is mandatory for copper alloys to prevent patina formation. Workers handling billets must wear cut-resistant gloves due to sharp edges, especially with larger diameters (>8 inches). Machining operations generate combustible metal dust – facilities should implement Class D fire extinguishers and proper ventilation per OSHA 1910.252 standards. Alloy-specific SDS sheets must be available onsite.
B2B Procurement Guide
When sourcing extruded billets, verify the supplier's capability to provide mill test reports (MTRs) confirming chemical composition and mechanical properties. Key procurement parameters include diameter tolerance (typically ±1–3mm), maximum allowable runout, and billet length consistency. For large-volume purchases, consider tolling arrangements with aluminum smelters to secure preferential pricing. Just-in-time delivery requires coordination with extrusion press schedules – maintain 2–4 weeks of inventory for critical alloys. Emerging digital platforms now offer real-time billet pricing indexed to LME aluminum prices plus regional premiums.
Related Manufacturers
- 主营：高温烘箱、热风循环烘箱、粉末混合机、V型混合机、二维混合机、电热干燥箱、无尘投料站、圆形混合机、电热鼓风干燥箱、防爆真空干燥机