1.What are the requirements for the storage environment of color-coated galvanized steel coils?
Dry and ventilated: The warehouse must maintain low humidity and good ventilation. The relative humidity is recommended to be controlled at < 70%.
Temperature stability: Avoid extreme fluctuations in ambient temperature (e.g., large temperature differences between day and night). Sudden temperature changes can easily cause condensation. The ideal temperature range is usually between 5°C and 40°C. Extreme heat may affect the physical properties of the coating; severe cold may have little effect on the coating itself, but it will increase the risk of condensation.
Clean and pollution-free: Keep away from corrosive gases (such as acid mist, alkali mist, sulfide, chloride ion, etc. near chemical plants and electroplating workshops). Keep away from dusty and oily areas to prevent surface contamination. It is prohibited to store or use chemicals such as acids, alkalis, salts, organic solvents, etc. in the warehouse.
2.What are the storage requirements for color-coated galvanized steel coils?
Use a dedicated saddle/bracket: It is absolutely forbidden to stack directly on the ground! You must use a solid, horizontal, dry wooden or plastic saddle/bracket to ensure that the bottom of the roll is suspended (≥10cm from the ground) and ventilated.
Keep it upright (stored vertically): Color coated steel coils must be stored vertically (standing), that is, the axis of the steel coil is perpendicular to the ground. It is strictly forbidden to store it horizontally (lay it flat)!
Stacking layer limit: According to the weight, size (inner diameter, outer diameter, width) of the coil and the load-bearing capacity of the saddle/bracket, the stacking layer is strictly limited. It is generally recommended not to stack more than 3 layers. Over-high stacking is very risky (too much pressure on the bottom layer, easy to collapse). Ensure that each layer of coil is aligned and the center of gravity is stable to prevent tilting and sliding.
Isolation and protection between rolls: Interlayer pad: Use dry, clean, and sufficiently thick wooden pads (width must be greater than the width of the steel coil) between the upper and lower layers of coils to evenly distribute the upper layer pressure and prevent crushing.
Interroll gap: A certain distance (usually >10cm) should be maintained between adjacent coils of the same layer to avoid mutual collision and friction, and to facilitate air circulation.
End protection: Ensure that the end of the coil (especially the head of the strip) does not contact hard objects or adjacent coils to prevent damage.
3.What are the packaging requirements for color-coated galvanized coils?
Keep the original packaging intact: During storage, try to keep the complete packaging (rust-proof paper/film, waterproof kraft paper/plastic film, steel corner guards, strapping, etc.) as it was when it left the factory. This is the first line of defense against moisture, dust and mechanical damage. If part of the packaging needs to be opened for inspection, it should be promptly restored to its original state after inspection.
Moisture-proof sealing: Pay special attention to the sealing of the package (especially the end surface). If there is any damage, it should be repaired and sealed with waterproof tape in time to prevent moisture from entering. In humid seasons or areas, you can consider covering the package with rainproof canvas (note that it cannot be completely sealed and a certain degree of air permeability must be ensured), but you need to regularly check whether there is condensation inside.
Corner protection: Ensure that the steel corner guards are in place and effective to protect the outer ring and end face of the coil from being bumped or scratched during transportation and stacking.
4.What are the handling operation specifications?
Use the right tools: A dedicated coil forklift or a crane/crane equipped with a C-hook (drum sling) must be used for handling. It is strictly forbidden to use a wire rope to hang directly! This can easily cause the coil to deform, the inner ring coating to be severely scratched, and even the substrate to be strangled.
Handle with care and avoid impact: The operation should be smooth, and no throwing, collision or falling should be allowed to occur, to prevent the coil from deforming or the packaging from being damaged. The forklift fork or C-hook should be aligned with the center axis of the coil, to maintain balance and avoid tilting.
Protect the end face and outer ring: Pay special attention to protecting the end face (especially the head part) and outer ring during transportation to avoid strong friction or impact with hard objects (such as forks, brackets, other coils).
5.How to deal with special circumstances?
Coastal/high humidity areas: Strengthen moisture prevention: Warehouses can be equipped with dehumidifiers to enhance ventilation (but avoid introducing humid air). The sealing of packaging is required to be higher.
Shorten the storage cycle: Try to speed up the turnover.
Areas with large temperature differences: Focus on preventing condensation: Pay close attention to weather forecasts and take measures before the temperature changes suddenly (such as ventilating in advance to balance the temperature and humidity). The temperature of the coiled material should be close to the storage temperature before it is put into storage. Dusty/industrial areas: Strengthen sealing: Ensure the airtightness of warehouse doors and windows, and repair damaged packaging in time.