1. Basic definition
Process treatment : O-state (annealed state) refers to the material state of the aluminum plate after the complete annealing process (heating to 300-400℃ and then slowly cooling) to eliminate the work hardening effect and obtain the lowest strength and highest ductility.
State identification : In the international standard, it is listed in parallel with H-state (work hardening state) and T-state (heat treatment state), representing the basic performance of the material without cold working strengthening or solid solution aging treatment.
2. Core characteristics
Strength : The tensile strength is significantly lower than that of the H/T state. For example, the tensile strength of 1060-O-state pure aluminum plate is only 60-100MPa, but the elongation can reach more than 35%; Formability : The internal grains are uniform, supporting high deformation processing (such as deep drawing and spinning) without cracking, and adapting to the needs of complex shape forming.
Industrial processing: used for pre-processing links that require subsequent stamping and bending, such as automobile cover prototype manufacturing; Corrosion-resistant application: Annealing does not affect the corrosion resistance of the alloy. 5083-O-state aluminum plates are widely used in shipbuilding and marine engineering.
3. Production and economy
Process cost: The annealing process increases the production cost by about 10%-15%, but the comprehensive cost optimization can be achieved by reducing the secondary processing loss (such as reducing the stamping scrap rate); Specification range: The thickness covers 0.2-500mm, and the width can reach more than 2000mm, which is suitable for large-scale plate needs. Summary: O-state aluminum plate achieves a performance balance of high ductility and low strength through the annealing process, and is the preferred material for deep processing and corrosion-sensitive scenarios. The core of its definition is to completely eliminate internal stress and work hardening, providing benchmark performance for subsequent forming.
