O-tempered stretched aluminum alloy
Overview
O-temper stretched aluminum alloy refers to aluminum that has undergone a full annealing process (O-temper) followed by controlled stretching to achieve desired mechanical properties. This treatment eliminates work hardening from prior processing, resulting in a soft, highly formable material. The O-temper designation is critical for applications requiring maximum ductility, such as deep-drawn containers or complex stamped parts. Unlike harder tempers (e.g., H-series), O-temper alloys exhibit minimal springback, making them ideal for precision forming operations.
Physical and Chemical Properties
O-temper aluminum alloys typically exhibit yield strengths of 20-50 MPa and elongations exceeding 30%, significantly softer than work-hardened tempers. Their face-centered cubic crystal structure enables exceptional cold-forming characteristics. Chemically, these alloys maintain aluminum's inherent corrosion resistance, though specific performance depends on alloying elements. Common alloy series like 1xxx (pure Al) and 3xxx (Al-Mn) are frequently supplied in O-temper for forming applications.
Main Applications
The primary use of O-temper stretched aluminum is in manufacturing processes requiring extreme deformation without cracking. This includes cookware production (pots, pans), pharmaceutical packaging (blister foils), and automotive fuel tanks. In aerospace, O-temper sheets serve as starting material for subsequent forming and heat treatment. The packaging industry values it for foil stock, where high purity 1xxx series alloys in O-temper enable ultra-thin, defect-free rolling.
Safety and Storage
As a non-flammable metal, O-temper aluminum poses minimal fire risk. However, fine aluminum dust generated during machining can be combustible in high concentrations, requiring proper dust extraction systems. Storage should prevent surface damage and moisture accumulation that could lead to pitting corrosion. Stack coils with protective interleaving material and maintain relative humidity below 60% in storage areas.
B2B Procurement Guide
Industrial buyers should specify: alloy grade (e.g., 1050-O, 3003-O), thickness tolerance (typically ±5-10% for O-temper), and required certifications (e.g., AMS, ASTM). Mill test reports should verify temper status through hardness or tensile testing. Lead times may be longer than for standard tempers due to additional annealing steps. Consider ordering from mills specializing in soft alloy production to ensure consistent quality. Just-in-time delivery is advisable to prevent unintended work hardening during handling.
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