Deep-drawing performance is a core indicator of the forming capability of aluminum circles used in cookware manufacturing, directly determining the mass production yield and efficiency of deep cookware. Haomei Aluminum's deep drawing aluminum circles for cookware are specifically developed to meet the forming requirements of cookware with high draw ratios. Through refined control of the metal microstructure, stable deep-drawing performance is achieved, making them the preferred blank material for cookware with large deformation volumes, such as deep saucepans, milk pots, and pressure cooker inner pots.
Deep-drawing performance is not a single-dimensional indicator, but a comprehensive forming capability determined by elongation, cupping value, thickness anisotropy coefficient (r-value), and grain uniformity. Our deep-drawing aluminum circles use 1050 and 1060 high-purity aluminum and 3003 aluminum-manganese alloy as core grades. In the H0 fully annealed state, the elongation after fracture of 1xxx series pure aluminum is consistently ≥28%, the cupping test (IE) value is ≥10.5mm, and the thickness anisotropy coefficient r is ≥1.2; the 3003 aluminum alloy has an elongation ≥22% and a cupping value ≥9.5mm. All batches of products have uniformly controlled grain size within ASTM 6-8 standards, free from mixed grains and coarse grain defects, ensuring the material's ultimate tensile forming capability from a core parameter perspective.
Superior deep-drawing performance stems from comprehensive metal microstructure control throughout the entire process. Our deep-drawing quality aluminum circles products prioritize DC semi-continuous casting billets: the ingots undergo over 12 hours of isothermal homogenization annealing at 480℃ to completely eliminate casting composition segregation and internal stress; then, the original casting microstructure is broken down through large-deformation hot rolling, combined with precise control of the reduction rate during cold rolling, and finally, uniform recrystallization is achieved through low-temperature long-time annealing. Compared to ordinary CC aluminum circles, deep drawing aluminum circles exhibit over 60% reduction in compositional segregation, complete release of internal residual stress, and uniform deformation transmission during deep drawing, preventing process defects such as sidewall cracking and excessive height differences at the drawing edge caused by localized stress concentration.
In actual mass production scenarios, deep drawing aluminum circles achieves a maximum deep-drawing ratio of 2.8:1, enabling most standard-depth cookware to be drawn in a single stretch without the need for an additional intermediate annealing process, increasing single-station production efficiency by over 30%. The uniform, fine-grained structure also prevents orange peel and pitting defects on the surface after deep drawing, resulting in a finished surface finish Ra≤0.8μm, allowing direct entry into subsequent processes such as non-stick coating and hard anodizing without additional polishing. The overall scrap rate in mass production can be controlled below 1%, significantly reducing raw material waste and rework costs, making it particularly suitable for the high stability requirements of fully automated continuous stamping production lines.
Currently, Haomei Aluminum supply deep drawing aluminum circles for cookware with thicknesses ranging from 0.4mm to 4.0mm and diameters from 120mm to 800mm. We support customized non-standard specifications and adjustments for special mechanical properties. Each batch of products comes with mechanical performance and cupping test reports. All products have passed international food contact safety certifications such as FDA and LFGB, and are packaged in moisture-proof and scratch-resistant packaging specifically designed for ocean shipping. As a professional aluminum circles supplier, Haomei Aluminum can provide targeted material selection and condition adjustment services based on customers' stretching process parameters and pot depth, helping customers optimize the forming process and improve mass production efficiency.