Guidelines for Rust-Proof Packaging of Galvanized Steel Coils
Release time:
2026-01-09
Guidelines for Rust-Proof Packaging of Galvanized Steel Coils
Core packaging materials
1. Vapor Phase Corrosion Inhibitor Materials
• Vapor phase corrosion inhibitor paper: Combines vapor phase slow release and physical isolation; the coated side faces the steel coil.
• VCI film: High-strength and transparent, used for heavy-duty or automated packaging.
2. Outer Protective Layer
• Outer wrapping sheet: Steel (0.4-0.6mm) or plastic (1.2-1.4mm), with overlapping edges facing downwards.
• Corner protectors: Protect the inner and outer edges of the steel coil to prevent packaging damage.
3. Strapping and Securing
• Straps: Circumferential and radial strapping to prevent loosening during transportation.
Standard packaging method
1. Simple packaging: Suitable for short distances and short-term indoor storage; offers limited protection.
2. Standard packaging: The most commonly used in China, meeting general transportation and storage requirements.
3. Premium/Export packaging: Features multiple layers of protection (such as fully enclosed anti-rust paper, inner and outer protective boards, and waterproof composite film), suitable for long-distance transport, sea shipping, or long-term storage.
Key operating procedures
1. Environment and Pre-treatment: Operate in a low-humidity environment; the steel coil temperature is recommended to be no higher than 65℃; inspect and address any edge defects.
2. Sealing Operation: All overlapping areas of the anti-rust paper and film must be completely sealed with tape.
3. Careful Handling: Use specialized lifting equipment such as C-hooks to avoid scratching the surface and packaging.
Storage and transportation
1. Storage Environment: Store indoors in a well-ventilated area, ideally with a relative humidity below 60%, avoiding the humid range of 60%-95%; use wooden blocks or saddles to prevent direct stacking.
2. Transportation Protection: Must be securely fastened to prevent shifting and collision; extra waterproofing measures are required for sea transport.
Regulations and Standards
It is recommended to refer to GB/T 4879-2016 "Rust-Proof Packaging," which specifies rust-proof packaging grades (divided into levels 1-4) and various methods (such as rust-inhibiting oil, vapor phase corrosion inhibition, and dry air sealing), which can be selected based on the delivery time and environment.
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