• Composition: Al-Mg-Si alloy (Mg 0.8–1.2 %, Si 0.4–0.8 %) with Cr, Cu, Mn micro-additions.
• Density: 2.70 g/cm³—lightweight yet strong.
• Mechanical Properties (T651): Tensile 310 MPa, Yield 276 MPa, Elongation 12 %.
• Heat-Treatable: Achieves properties via solution + aging + stretch.
• Corrosion Resistance: Excellent in marine and industrial atmospheres.
• Weldability: Good with ER4043/5356 filler; post-weld re-aging recommended.
• Machinability: Chips cleanly; low residual stress prevents distortion during heavy machining.
• Surface: 400-grit polished, blemish-free—ready for clear anodizing without pre-polish.

• Ultra-tight thickness tolerance (±0.05 mm) reduces CNC set-up time.
• Flatness down to 0.1 mm/m²—ideal for skeleton-cut or fully-lasered parts.
• Residual stress < 10 MPa; large plates stay flat after 2 m long milling passes.
• Mirror-ready surface eliminates sanding before decorative anodizing.
• Up to 2 m × 6 m plate sizes cut material waste versus welded sub-plates.
• Stable at 340 °C short-term exposure—perfect for oven-test fixtures.

• Premium price: typically 8–15 % above standard 6061-T6.
• Thin gauges (<6 mm) may have limited stock; lead times longer.
• Lower fatigue strength versus 6082-T6 in dynamic loading applications.
• Stretching process reduces elongation slightly—avoid deep drawing.

• Heat Treatment: Do NOT re-solutionize; use artificial aging only (160 °C / 8 h max) to regain properties after welding.
• Surface Protection: Store vertically to prevent scratches on pre-polished faces; use plastic separators.
• Welding: Preheat to 100 °C for thick sections; post-weld stretch not required but re-age to T6/T651 temper.
• Machining: Use PCD or polished carbide tools for mirror finishes; flood coolant to evacuate chips and prevent galling.
• Anodizing: Can be Type II or Type III; racking marks should be planned outside cosmetic zones.

• Precision jigs & fixtures: semiconductor trays, phone test nests, 5-axis vacuum chucks.
• Anodized architectural panels: large-format façades, LED light-box frames.
• Aerospace & automotive: wing ribs, bulkheads, battery enclosures requiring tight flatness.
• Medical equipment: CT-gantry plates, robotic arm bases needing dimensional stability.
• Oven-test & reflow carriers: 2 m long PCBA carriers that survive 340 °C reflow cycles.
• Sports equipment: bicycle suspension links where fatigue life and flatness coexist.

Expect a 10–15 % premium over standard 6061-T6 plate. However, eliminating skim cuts, stress-relief cycles, and pre-anodize polishing often delivers a lower total part cost.

For up-to-date 6061-T651 pricing, plate sizes, and cut-to-size services, contact Krosino manufacturing today.