I. Classification by Processing Technology

1. Hot-Dip Galvanized Steel (HDG)

Process: Steel sheet is immersed in molten zinc (450-460°C), with a zinc layer thickness typically 50-200g/㎡.

Features: Uniform zinc layer, strong adhesion, and excellent corrosion resistance (suitable for outdoor applications).

Applications: Building roofs, highway guardrails, and photovoltaic mounting systems (such as the West African pipe piles).

2. Electrogalvanized Steel (EG)

Process: Electrolytically deposits a zinc layer with a thickness of 5-30g/㎡ and a smooth surface.

Features: High precision (controllable zinc layer thickness), suitable for complex forming.

Applications: Appliance housings (such as air conditioner housings) and precision instrument housings (requiring fingerprint resistance).

3. Alloyed Galvanized Steel (GA)

Process: Hot-dip galvanizing followed by heating to form an alloy layer (Fe-Zn).

Features: Anti-powdering, high-temperature resistance (200°C), and excellent weldability.

Applications: Automotive chassis and battery pack housings (in the new energy sector). II. Classification by Zinc Coating Thickness

1. Standard Zinc Coating (50-120g/㎡)

Standard: Complies with the national standard GB/T 2518-2019, suitable for general corrosive environments.

Applications: Indoor equipment housings, building components in dry areas.

2. Thick Zinc Coating (≥200g/㎡)

Standard: EU EN 10346, salt spray resistance ≥1000 hours.

Applications: Beach villas, chemical plants (such as those in West African mangrove environments).

3. Cut-off Protection Zinc Coating

Process: Cold-spray zinc (zinc content ≥99.9%) on the cut edges, increasing the thickness by 30-50μm.

Applications: Pipe piles, steel structure joints (to prevent cut-off corrosion).

III. Classification by Application

1. Galvanized Sheet for Building Structures

Requirements: High load-bearing capacity, weather resistance (C5 corrosion environment).

Solution: 200g/㎡ zinc coating + cold-spray zinc cut-off treatment, ISO 12944 certified. 2. Galvanized Sheet for Automotive Manufacturing

Requirement: Balance of lightweight and safety (e.g., new energy battery packs).

Solution: High-strength galvanized sheet (550MPa grade), achieving a 15% weight reduction while meeting crash test requirements.

3. Galvanized Sheet for Reservoirs

Requirement: Water and chemical resistance (pH 5-9).

Solution: Epoxy resin coating on the zinc layer, passing a 240-hour neutral salt spray test.

4. Galvanized Sheet for Appliance Exteriors

Requirement: Fingerprint and scratch resistance (e.g., outdoor air conditioner housings).

Solution: Electrogalvanized sheet + anti-fingerprint coating, combined with pearl cotton for protection (refer to a Vietnamese example).

IV. Classification by Mechanical Properties

1. Standard-Strength Galvanized Sheet

Tensile Strength: 370-450MPa, suitable for non-load-bearing structures (e.g., decorative panels).

2. High-Strength Galvanized Sheet

Tensile Strength: ≥550MPa, suitable for load-bearing structures (e.g., vehicle chassis, building trusses). Case Study: In the West African pipe pile project, 35CrMo alloy galvanized sheet metal is heat-resistant to 500°C and certified for a 30-year lifespan.

V. Shandong Rongxin Service Advantages

1. Customized Production: Supports small batch orders (minimum order quantity of 500 pieces) and allows for rapid switching of production line specifications (e.g., 50×50mm to 200×200mm).

2. Technical Support: Provides EN 10204 3.2 certificate and ISO 12944 corrosion resistance test report, meeting EU CE certification requirements.

3. Supply Chain Assurance: Bonded warehouse stocking (e.g., Hamburg Port), dedicated logistics (7-day delivery from Shanghai Port to Ho Chi Minh Port), and door-to-door transportation services.

By combining these categories with application scenarios, Shandong Rongxin provides customers with a one-stop solution from material selection to finished product delivery, helping global clients achieve cost reduction, efficiency improvement, and quality upgrades.