How is angle steel inventory classified in steel warehouses?

Angle steel inventory is classified by three key criteria for easy management and retrieval: 1) Grade: Separating Q235B (general-purpose) from Q355B (high-strength) and special grades (e.g., Q235NH); 2) Type and specification: Grouping equal-side (∠20×3 to ∠200×24) and unequal-side (∠30×20×3 to ∠200×125×18) types, then sorting by side length and thickness; 3) Length: Storing 6m, 9m, and 12m lengths in separate zones. For example, a warehouse might have a "Q235B Equal-side Zone" with subsections for ∠50×5 (6m), ∠50×5 (9m), and ∠63×5 (6m). This classification reduces retrieval time-contractors needing Q355B ∠75×5 (12m) can directly locate the designated area instead of searching through mixed inventory.