In the manufacturing of smart lockers , the choice of material directly determines the product's longevity, structural performance, and overall value. The core steel materials used are listed below, each with its own specific application scenarios.

1. Cold Rolled Steel Sheet (CRS)

Cold rolled steel sheet is produced by further rolling hot-rolled steel sheet at room temperature. It features a smooth, flat surface and uniform thickness, offering excellent strength and rigidity. Since it undergoes no coating treatment, its rust resistance is relatively weak, and it relies on subsequent surface treatments (such as powder coating or baking paint) for protection and aesthetic requirements.

Core Characteristics & Advantages:

• High structural strength: The cold rolling process refines the steel's grain structure, resulting in outstanding compression and bending resistance, making it suitable for high-load-bearing applications.
• Superior workability: Easy to stamp, bend, and weld, ideal for smart cabinets with complex designs and precise structures.
• Strong surface adhesion: After derusting and phosphating treatment, the coating adheres firmly, offering a wide range of durable color options.
• Cost-effectiveness: Low base material cost; combined with appropriate surface treatment, it balances performance and budget.

Widely used in:

• Various types of strong cabinets in dry indoor environments.​

2. Galvanized Steel Sheet (GI)

Galvanized steel sheet is made from high-quality cold-rolled steel sheet as the base material, which is then coated with a dense and uniform zinc protective layer through hot-dip galvanizing or electro-galvanizing processes. The zinc layer not only effectively isolates the steel from environmental exposure but also provides "sacrificial protection"—even if the surface is damaged, the zinc will oxidize preferentially, protecting the base material from corrosion.

Core Characteristics & Advantages:

• Excellent corrosion resistance: The zinc layer provides long-lasting rust protection, making it ideal for both indoor and outdoor environments such as office buildings, shopping malls, schools, and community facilities, effectively combating the humidity typical of Hong Kong's climate.
• High cost-effectiveness: While offering good rust resistance, the cost remains relatively controllable, making it an excellent choice that balances durability and economic efficiency.
• Good surface adhesion: The galvanized layer provides an excellent substrate for subsequent electrostatic powder coating, resulting in a uniform, long-lasting baked enamel finish on the cabinet body that does not peel off.
• Combines environmental friendliness with durability: The long service life of the zinc layer reduces maintenance frequency and lowers the total life-cycle cost.

​Widely used in:

• General indoor, outdoor, and humid environments

3. Stainless Steel Sheet (SS)

​Stainless steel sheet is a high-alloy steel containing alloying elements such as chromium and nickel. Its surface naturally forms a dense and transparent chromium oxide passive film, making it more resistant to rust and corrosion than ordinary carbon steel. The most common type used for smart lockers is 304 stainless steel, which offers good corrosion resistance and formability.

Core Characteristics & Advantages:

• Ultimate corrosion resistance: Resists water, humidity, and a wide range of chemical substances, virtually eliminating rust issues at the source.
• Easy to clean and maintain: The smooth surface resists dirt buildup; a simple wipe restores its original cleanliness, resulting in low maintenance costs.
• Aesthetic and modern appearance: Its unique metallic luster gives smart lockers a professional, high-end visual appeal, maintaining long-lasting good looks without the need for painting.
• Hygienic and environmentally friendly: The material is stable and non-polluting, meeting environmental standards for applications with strict hygiene requirements.

Widely used in:

• Outdoor environments - withstands wind, rain, and sun exposure
• High-humidity environments - such as swimming pools, gyms, and underground parking garages
• Places with stringent hygiene requirements - such as hospitals, laboratories, and food factories
• High-end commercial spaces – enhances spatial quality with its modern appearance

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