1.Why is it not recommended to store cold-rolled coils in the open air?
Steel warehousing standards clearly distinguish the storage conditions for different products. Simply put, the thicker, coarser, and larger the product, the better it can withstand the open-air environment; the thinner, finer, and more delicate the product, the more it needs to be protected in a warehouse.
2.What types of food can be stored outdoors?
Large structural steel sections, rails, thick steel plates, large-diameter steel pipes, forgings, etc. These products have thick cross-sections and relatively small surface areas, so short-term wind and rain erosion has a limited impact on their performance.
3.What types of items must be stored in a warehouse?
Cold-rolled coils, cold-drawn materials, thin steel plates, steel strips, silicon steel sheets, small-diameter thin-walled tubes, etc. Cold-rolled coils belong to this category.
4.What harm does storing cold-rolled coils for days cause?
Directly leading to rust and failure of rust-preventive oil: The rust-preventive oil film on the surface of cold-rolled coils will quickly evaporate, run off, or deteriorate under the wind, rain, and sun exposure of open-air environments. Once unprotected, rust spots will appear on the steel plate surface in a very short time (even a few days), causing material degradation or scrapping.
Uncontrollable humidity, accelerating corrosion: Warehouses require ventilation on sunny days and closed windows to prevent moisture on rainy days to maintain a suitable storage environment. Humidity in open-air environments cannot be controlled, and condensation caused by day-night temperature differences will directly adhere to the steel coils, causing large-scale rust.
Physical damage risk: Open-air sites are usually not as smooth and fine as warehouse floors and are prone to debris. Insufficient or unstable padding may cause slight deformation of the steel coils under gravity (changes in ellipticity), affecting subsequent uncoiling and use.
Violation of basic warehousing regulations: Professional warehousing management clearly stipulates that clean, well-drained sites should be selected, and the coils should not be stored with corrosive substances such as acids, alkalis, and salts. It is difficult to completely eliminate these corrosive factors in open-air environments.
5.What if temporary outdoor storage is necessary?
Site Selection and Base Preparation: Choose a high-lying, well-drained, paved site. Drainage ditches must be dug around the perimeter to ensure the site is completely free of standing water. The base of the stack must be raised at least 200mm using wooden blocks or stone slabs to ensure ventilation and prevent groundwater seepage.
Tight Covering: This is the most critical step. The steel coils must be completely and tightly covered with a waterproof tarpaulin and securely fastened to prevent rainwater infiltration and the tarpaulin from being blown away by the wind.
Rapid Turnover: This is the most important point. Once stored outdoors, it must be prioritized for immediate release and put into use or transferred to a warehouse as soon as possible (ideally within a few days to a week). The longer it is stored, the greater the risk.